Process and system for fully biological treatment of organic wastewater

Abstract

The present invention relates to the technical field of wastewater treatment and relates to a process and system for fully biological treatment of organic wastewater. The process has four process modes and comprises: selecting a corresponding process mode on the basis of whether the supply of organic wastewater in an equalization tank is sufficient and the content of BOD5 in the organic wastewater: when a liquid level is higher than a lowest liquid level line and the content of BOD5 is 0-300 mg / L, selecting a working time sequence process mode I to treat the organic wastewater; when the liquid level is higher than the lowest liquid level line and the content of BOD5 is greater than or equal to 300 mg / L, selecting a working time sequence process mode II to treat the organic wastewater; and when the liquid level is lower than the lowest liquid level line, selecting a self-circulation time sequence process mode I or II. The process of the present invention does not require the addition of chemical agents such as a flocculant, a phosphorus removal agent, and a disinfectant during the treatment of the organic wastewater and thus would not cause secondary pollution to the environment.

Description

A completely biological type organic sewage treatment process and system TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewage treatment, and relates to a completely biological type organic sewage treatment process and system. BACKGROUND

[0002] At present, in the treatment of organic sewage such as domestic sewage, food industry sewage and medical sewage, a single process such as chemical sedimentation method and microbial method is mostly used. The single process treatment method can treat organic sewage, but there are still problems: (1) due to the single process, improper treatment and the use of chemical sedimentation method, a large amount of flocculants, precipitants, phosphorus removal agents and disinfectants and other chemical agents are used, causing secondary environmental pollution and cost increase; (2) the existing organic sewage treatment process does not provide a suitable living environment for microorganisms and effectively control the dissolved oxygen content, and a large amount of chemical agents are used, resulting in a large number of microorganism deaths, a decrease in biological activity and growth rate, and low treatment efficiency and cost increase; (3) in the existing microbial method treatment, due to the use of continuous water feeding, continuous water discharge, continuous aeration, continuous stirring and continuous reflux mode, the microorganism reproduction and growth are greatly affected, the microorganism survival environment is destroyed, and the water quality of the discharged water is unstable; (4) for some special sewage treatment occasions such as tourist attractions, commercial highway service areas, etc., when the supply of organic sewage is insufficient, microorganisms cannot obtain necessary nutrients, resulting in a large number of deaths and subsequent work failure; however, the traditional treatment method is manual feeding and manual operation, which is complex and difficult to effectively control, resulting in cost increase. SUMMARY

[0003] In view of the technical problem that the existing organic sewage treatment process needs to continuously add flocculants, phosphorus removal agents and disinfectants and other chemical agents, causing secondary environmental pollution, the present application provides a completely biological type organic sewage treatment process and system, which does not need to add any chemical agent in the organic sewage treatment process.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0005] A completely biological type organic sewage treatment process, comprising the following steps:

[0006] According to the judgment of the liquid level of the adjusting tank and the BOD5 content in the organic sewage, four process modes are selected:

[0007] If the liquid level of the adjusting tank is higher than the minimum liquid level line and the BOD5 content is 0-300 mg / L, process mode one of working time sequence is selected to treat the organic sewage;

[0008] If the liquid level of the adjusting tank is higher than the lowest liquid level line and the BOD5 content is greater than or equal to 300 mg / L, a working time sequence process mode two is selected to treat the organic wastewater;

[0009] If the liquid level of the adjusting tank is lower than the lowest liquid level line, a self-circulation time sequence process mode one or a self-circulation time sequence process mode two is selected;

[0010] The working time sequence process mode one comprises the following steps:

[0011] SA1, water feeding

[0012] The organic wastewater in the adjusting tank is introduced into the facultative anaerobic zone of the M-process biochemical tank, and then the organic wastewater flows into the oxidation zone and reaches the highest liquid level line of the oxidation zone, and the water feeding is stopped;

[0013] SA2, biochemical treatment

[0014] The organic wastewater in the oxidation zone is subjected to a timed pulse intermittent aeration treatment according to a set aeration program; at the same time of the aeration treatment, the organic wastewater in the facultative anaerobic zone is subjected to a timed stirring denitrification and phosphorus release treatment, and the biological fluidized wall in the M-process biochemical tank is subjected to a timed backwashing flow treatment; until the aeration program is executed, the sequential batch biochemical treatment of the organic wastewater is completed; the aeration program comprises, in time sequence, a timed aerobic aeration, a quantitative reflux, a timed anoxic aeration, a quantitative reflux, a timed aerobic aeration, a quantitative reflux, a timed anoxic aeration, a quantitative reflux and a timed aerobic aeration; the mixed liquid reflux ratio of the quantitative reflux to the facultative anaerobic zone is 1 / 3-1 / 2 of the volume of the oxidation zone;

[0015] SA3, sedimentation, water drainage and sludge discharge

[0016] After the biochemical treatment of step SA2 is completed, the sedimentation is performed for 0.5-1 h to obtain upper liquid and lower sludge; the upper liquid is discharged and then disinfected by ultraviolet rays to obtain clean water; the lower sludge is discharged to the artificial wetland;

[0017] The working time sequence process mode two comprises the following steps:

[0018] SB1, water feeding

[0019] The organic wastewater in the adjusting tank is introduced into the facultative anaerobic zone of the M-process biochemical tank, and then the organic wastewater flows into the oxidation zone and reaches the highest liquid level line of the oxidation zone, and the water feeding is stopped;

[0020] SB2, biochemical treatment

[0021] According to the set aeration program, the organic sewage in the oxidation zone is treated by the timed pulse intermittent aeration; while the aeration treatment is being carried out, the organic sewage in the facultative anaerobic zone is treated by the timed stirring denitrification and phosphorus release, and the biological fluidized wall in the M process biochemical tank is treated by the timed backflow; until the aeration program is executed, the organic sewage is completed by the sequencing batch biochemical treatment; the aeration program includes the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration, the quantitative reflux, the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration, the quantitative reflux, the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration in time sequence; the reflux ratio of the mixed liquid refluxed to the facultative anaerobic zone is 1 / 3-1 / 2 of the oxidation zone volume;

[0022] SB3, sedimentation, water drainage, sludge drainage

[0023] After the biochemical treatment of step SB2 is completed, the sedimentation is carried out for 0.5-1 h to obtain the upper liquid and the lower sludge; the upper liquid is discharged and then disinfected by the ultraviolet rays to obtain the clean water; the lower sludge is drained to the artificial wetland;

[0024] The self-circulation time sequence process mode I includes the following steps:

[0025] SC1, feeding:

[0026] The carbon-nitrogen compound nutrient liquid is simultaneously introduced into the first facultative anaerobic zone and the oxidation zone, the set value of the feeding flow meter is reached, and the introduction of the carbon-nitrogen compound nutrient liquid is stopped;

[0027] SC2, biochemical treatment:

[0028] The organic mixed liquid formed by the carbon-nitrogen compound nutrient liquid and the organic sewage in the M process biochemical tank is treated by the timed pulse intermittent aeration according to the set aeration program; while the aeration treatment is being carried out, the organic mixed liquid in the facultative anaerobic zone is treated by the timed stirring denitrification and phosphorus release, and the biological fluidized wall in the M process biochemical tank is treated by the timed backflow; until the aeration program is executed, the self-circulation treatment of the organic mixed liquid is completed; the aeration program includes the timed aerobic aeration, the quantitative reflux, the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration, the quantitative reflux, the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration in time sequence; the reflux ratio of the mixed liquid refluxed to the facultative anaerobic zone is 1 / 3-1 / 2 of the oxidation zone volume;

[0029] SC3, sedimentation, sludge drainage, reflux:

[0030] After the biochemical treatment of step SC2 is completed, the sedimentation is carried out for 0.5-1 h to obtain the upper liquid and the lower sludge; the lower sludge is drained to the artificial wetland, and the upper liquid is quantitatively refluxed to the first facultative anaerobic zone;

[0031] In the self-circulation biochemical treatment process, when the organic wastewater in the regulating tank reaches the upper limit of the liquid level switch, the self-circulation timing process mode is stopped, and the working timing process mode one or the working timing mode two is automatically entered.

[0032] The self-circulation timing process mode two comprises the following steps:

[0033] SD1, feeding:

[0034] Meanwhile, the carbon-nitrogen compound nutrient solution is introduced into the first facultative anaerobic zone and the oxidation zone, and the feeding flowmeter reaches the set value, and the introduction of the carbon-nitrogen compound nutrient solution is stopped.

[0035] SD2, biochemical treatment:

[0036] The carbon-nitrogen compound nutrient solution and the organic mixed solution formed by the organic wastewater in the M-process biochemical tank are subjected to timed pulse intermittent aeration treatment on the organic mixed solution in the oxidation zone according to the set aeration program; at the same time of the aeration treatment, the organic mixed solution in the facultative anaerobic zone is subjected to timed stirring denitrification and phosphorus release treatment, and the biological fluidized wall in the M-process biochemical tank is subjected to timed backflow treatment; until the aeration program is executed, the self-circulation treatment of the organic mixed solution is completed; the aeration program comprises, in time sequence, timed anoxic aeration, quantitative backflow, timed aerobic aeration, quantitative backflow, timed anoxic aeration, quantitative backflow, and timed aerobic aeration; the backflow ratio of the mixed solution backflowing to the facultative anaerobic zone to the volume of the oxidation zone is 1 / 3-1 / 2.

[0037] SD3, sedimentation, sludge discharge, and backflow:

[0038] After the biochemical treatment in step SD2 is completed, the sedimentation is performed for 0.5-1 h to obtain upper liquid and lower sludge; the lower sludge is discharged to the artificial wetland, and the upper liquid is quantitatively backflowed to the first facultative anaerobic zone.

[0039] In the self-circulation biochemical treatment process, when the organic wastewater in the regulating tank reaches the upper limit of the liquid level switch, the self-circulation timing process mode is stopped, and the working timing process mode one or the working timing mode two is automatically entered.

[0040] Further limitation, the timed anoxic aeration, the anoxic aeration range: DO dissolved oxygen content is 0.1-1 mg / L, and the time of the timed anoxic aeration is 1-2 h;

[0041] The timed aerobic aeration, the aerobic aeration range: DO dissolved oxygen content is 1-5 mg / L, and the time of the timed aerobic aeration is 1-2 h.

[0042] Further limitation, the process has two aeration modes, namely, timed aerobic pulse intermittent aeration and timed anoxic pulse intermittent aeration.

[0043] The timed aerobic pulse intermittent aeration is that when the DO content of the mixed liquid in the oxidation zone reaches the upper limit of the aerobic aeration, the air inlet electromagnetic valve is closed; when the DO content of the mixed liquid in the oxidation zone reaches the lower limit of the aerobic aeration, the air inlet electromagnetic valve is opened; the above steps are repeated for many times until the timing is completed, and the present aerobic aeration is completed.

[0044] The timed anoxic pulse intermittent aeration is that when the DO content of the mixed liquid in the oxidation zone reaches the upper limit of the anoxic aeration, the air inlet electromagnetic valve is closed; when the DO content of the mixed liquid in the oxidation zone reaches the lower limit of the anoxic aeration, the air inlet electromagnetic valve is opened; the above steps are repeated for many times until the timing is completed, and the present anoxic aeration is completed.

[0045] An organic sewage treatment system for realizing the complete biological type organic sewage treatment process, the organic sewage treatment system comprising a regulating tank, an M-process biochemical tank, a sludge tank, an ultraviolet sterilizer, a gas storage tank and an M-process PLC central control system;

[0046] The organic sewage treatment system further comprises a fan or an air compressor;

[0047] The M-process biochemical tank comprises a facultative anaerobic zone, a biological selection zone and an oxidation zone;

[0048] A first biological fluidized wall is arranged in the facultative anaerobic zone, the first biological fluidized wall divides the facultative anaerobic zone into a first facultative anaerobic zone and a second facultative anaerobic zone which are in communication with each other; a second biological fluidized wall is arranged in the biological selection zone; a third biological fluidized wall is arranged in the oxidation zone; the regulating tank is in communication with the first facultative anaerobic zone, the second facultative anaerobic zone is in communication with the oxidation zone through the second biological fluidized wall; the gas storage tank and the ultraviolet sterilizer are both in communication with the oxidation zone;

[0049] A regulating tank liquid level switch is arranged on the regulating tank; an oxidation zone liquid level switch and a DO dissolved oxygen sensor are respectively arranged on the oxidation zone; an air inlet electromagnetic valve is arranged between the gas storage tank and the oxidation zone; the fan is connected with the gas storage tank, or the air compressor is connected with the gas storage tank;

[0050] The facultative anaerobic zone is also provided with a facultative anaerobic zone sludge pump, a facultative anaerobic zone agitator and a facultative anaerobic zone backflow pump; the facultative anaerobic zone backflow pump is arranged close to the first biological fluidized wall; the biological selection zone is provided with a biological selection zone backflow pump close to the second biological fluidized wall; the oxidation zone is provided with an oxidation zone drainage pump, an oxidation zone sludge pump, an oxidation zone backflow pump and an oxidation zone backflow pump, and the oxidation zone backflow pump is arranged close to the third biological fluidized wall; the oxidation zone is communicated with the first facultative anaerobic zone through the oxidation zone backflow pump; a backflow flow meter is further arranged between the oxidation zone backflow pump and the first facultative anaerobic zone; the oxidation zone drainage pump is communicated with the ultraviolet sterilizer; the facultative anaerobic zone sludge pump and the oxidation zone sludge pump are communicated with the sludge tank;

[0051] The organic sewage treatment system further comprises a feeding tank, a first feeding pump, a first feeding flow meter, a second feeding pump and a second feeding flow meter; the feeding tank is communicated with the facultative anaerobic zone through the first feeding pump and the first feeding flow meter, and the feeding tank is communicated with the oxidation zone through the second feeding pump and the second feeding flow meter;

[0052] The M-process PLC central control system comprises a working time control flow module one, a working time control flow module two, a self-circulation time control flow module one and a self-circulation time control flow module two; the working time control flow module one and the working time control flow module two are both connected with the facultative anaerobic zone sludge pump, the facultative anaerobic zone agitator, the facultative anaerobic zone backflow pump, the biological selection zone backflow pump, the oxidation zone backflow pump, the oxidation zone drainage pump, the oxidation zone sludge pump, the oxidation zone backflow pump and the air inlet electromagnetic valve; the self-circulation time control flow module one and the self-circulation time control flow module two are both connected with the facultative anaerobic zone sludge pump, the facultative anaerobic zone agitator, the facultative anaerobic zone backflow pump, the biological selection zone backflow pump, the oxidation zone backflow pump, the oxidation zone sludge pump, the oxidation zone backflow pump, the air inlet electromagnetic valve, the first feeding pump and the second feeding pump.

[0053] Further limited, the organic sewage treatment system further comprises a data acquisition module connected with the M-process PLC central control system, and the data acquisition module is connected with the regulating tank liquid level switch, the backflow flow meter, the oxidation zone liquid level switch, the DO dissolved oxygen sensor, the first feeding flow meter and the second feeding flow meter.

[0054] The organic sewage treatment process provided by the application adopts sequencing batch treatment, and processes the organic sewage by means of timed anoxic pulse intermittent aeration, timed aerobic pulse intermittent aeration, quantitative reflux alternation circulation, timed backflow of the biological fluidized wall during each aeration period, and timed stirring denitrification and phosphorus release of the facultative anaerobic zone, and a treatment cycle is completed through multiple periods. The entire process presents the pulse intermittent characteristics in the organic sewage treatment process, and therefore the process is named as M process. The control system and the biochemical pool structure based on the M process are named as the M process PLC central control system and the M process biochemical pool.

[0055] In the application, four different process modes can be selected according to whether the supply of the organic sewage in the adjusting pool is sufficient and the size of the BOD5 content, including working time sequence process mode one, working time sequence process mode two, self-circulation time sequence process mode one and self-circulation time sequence process mode two, so as to ensure the activity of the microorganisms, the stability, adaptability and safety of the system.

[0056] In the process, no chemical agent such as flocculant, phosphorus removal agent and disinfectant needs to be added in the process of treating the organic sewage, and no secondary pollution to the environment is caused.

[0057] The characteristics and beneficial effects of the technical scheme of the application are as follows:

[0058] 1. The process adopts sequencing batch treatment and a unique process mode for the organic sewage, so as to ensure the stability of the drainage water quality, and the drainage water quality is higher than the national first-level A discharge standard.

[0059] 2. The M process biochemical pool is provided with a biological selection zone, and the biological fluidized wall is arranged in each functional zone (oxidation zone, biological selection zone, facultative anaerobic zone), the backflow technology is used for the biological fluidized wall, and the timed pulse intermittent aeration mode is adopted, so as to ensure the activity and growth of the microorganisms, and the treatment efficiency is improved by more than 25%, and sludge bulking is avoided.

[0060] 3. In the application, the M process biochemical pool is divided into three functional zones, namely, the facultative anaerobic zone, the oxidation zone and the biological selection zone, the biological fluidized wall is arranged in each zone, each functional zone integrates multiple functions, the structure is compact and simple, and the primary sedimentation tank and the secondary sedimentation tank are omitted; and due to the ultraviolet disinfection and the sludge discharge to the artificial wetland for reuse (without any chemical agent), the dosing room and the sludge removal workshop are saved. The total land area is saved by more than 30%.

[0061] 4. The M process PLC central control system adopts modular centralized control, and the automation degree is high, so a large amount of manpower is saved. BRIEF DESCRIPTION OF DRAWINGS

[0062] Fig. 1 is a process flow diagram of the organic sewage treatment process.

[0063] Figure 2 is a top view of the M-process biochemical tank structure;

[0064] Figure 3 is a layout of the aeration pipeline of the M-process biochemical tank;

[0065] Figure 4 is a working timing process mode 1 diagram;

[0066] Figure 5 is a working timing process mode 2 diagram;

[0067] Figure 6 is a self-circulation timing process mode 1 diagram;

[0068] Figure 7 is a self-circulation timing process mode 2 diagram;

[0069] Figure 8 is a control principle diagram of the M-process PLC central control system;

[0070] Figure 9 is a control principle diagram of the working timing flow module;

[0071] Figure 10 is a control principle diagram of the self-circulation timing flow module;

[0072] Wherein:

[0073] 100 - conditioning tank; 110 - lifting pump; 120 - conditioning tank liquid level switch; 200 - M-process biochemical tank; 210 - facultative anaerobic zone; 211 - first facultative anaerobic zone; 212 - second facultative anaerobic zone; 213 - facultative anaerobic zone sludge pump; 214 - facultative anaerobic zone agitator; 215 - facultative anaerobic zone backwash flow pump; 216 - facultative anaerobic zone water inlet; 217 - facultative anaerobic zone water outlet; 220 - biological selection zone; 221 - biological selection zone backwash flow pump; 230 - oxidation zone; 231 - oxidation zone drainage pump; 232 - oxidation zone sludge pump; 233 - oxidation zone backwash flow pump; 234 - aeration pipe; 235 - oxidation zone liquid level switch; 236 - DO dissolved oxygen sensor; 240 - first biological fluidized wall; 250 - second biological fluidized wall; 251 - communication hole; 260 - third biological fluidized wall; 300 - sludge tank; 400 - ultraviolet sterilizer; 500 - oxidation zone backflow pump; 600 - backflow flow meter; 700 - gas storage tank; 710 - fan; 720 - air inlet electromagnetic valve; 800 - M-process PLC central control system; 900 - feeding tank; 910 - first feeding pump; 920 - first feeding flow meter; 930 - second feeding pump; 940 - second feeding flow meter. DETAILED DESCRIPTION

[0074] The technical solution protected by the present application is described in detail below with reference to the accompanying drawings.

[0075] Example 1

[0076] Referring to FIG. 1 and FIG. 2, the embodiment provides an organic sewage treatment system, comprising an adjusting tank 100, an M-process biochemical tank 200, a sludge tank 300, an ultraviolet sterilizer 400 and a gas storage tank 700.

[0077] In the embodiment, the M-process biochemical tank 200 comprises a facultative anaerobic zone 210, a biological selection zone 220 and an oxidation zone 230 which are sequentially communicated; a first biological fluidized wall 240 is arranged in the facultative anaerobic zone 210, the first biological fluidized wall 240 divides the facultative anaerobic zone 210 into a first facultative anaerobic zone 211 and a second facultative anaerobic zone 212 which are communicated with each other; the adjusting tank 100 is communicated with the first facultative anaerobic zone 211, the second facultative anaerobic zone 212 is communicated with the biological selection zone 220; the biological selection zone 220 is communicated with the oxidation zone 230; the gas storage tank 700, the ultraviolet sterilizer 400 and the sludge tank 300 are all communicated with the oxidation zone 230.

[0078] Specifically, the facultative anaerobic zone 210 is located at the rightmost end of the M-process biochemical tank 200, one side of the first biological fluidized wall 240 abuts against the inner wall of the M-process biochemical tank 200, and the other side leaves a gap with the inner wall of the M-process biochemical tank 200, so that the first facultative anaerobic zone 211 and the second facultative anaerobic zone 212 are communicated.

[0079] In the embodiment, the facultative anaerobic zone 210 is further provided with a facultative anaerobic zone sludge pump 213, a facultative anaerobic zone agitator 214 and a facultative anaerobic zone backwash flow pump 215; the facultative anaerobic zone backwash flow pump 215 is arranged close to the first biological fluidized wall 240.

[0080] In implementation, the main function of the facultative anaerobic zone 210 is to perform a stirring denitrification and phosphorus release process on the mixed liquid refluxed from the oxidation zone 230, and the volume of the facultative anaerobic zone 210 is equal to the volume of the oxidation zone 230.

[0081] In the embodiment, a second biological fluidized wall 250 is arranged in the biological selection zone 220; the biological selection zone 220 is communicated with the oxidation zone 230 through the second biological fluidized wall 250.

[0082] In the embodiment, a biological selection zone backwash flow pump 221 is arranged in the biological selection zone 220 close to the second biological fluidized wall 250; the second biological fluidized wall 250 is backwashed by the biological selection zone backwash flow pump 221.

[0083] In implementation, the biological selection zone 220 is located between the facultative anaerobic zone 210 and the oxidation zone 230, the volume of the biological selection zone 220 is 10% of the volume of the oxidation zone 230, and the main function of the biological selection zone 220 is to avoid sludge bulking and to buffer microorganisms.

[0084] In implementation, the biological selection zone 220 and the facultative anaerobic zone 210 are separated by a concrete wall, and a water inlet is arranged at the upper part of the concrete wall, i.e. the facultative anaerobic zone water outlet 217. The biological selection zone 220 and the oxidation zone 230 are separated by a second biological fluidization wall 250, and a communication hole 251 is arranged on the second biological fluidization wall 250 for the convenience of communication, and the communication hole 251 is 1-5 (or the water inlet is arranged at 1 / 5-1 / 4 height from the bottom of the biological selection zone 220 upwards).

[0085] In the embodiment, the facultative anaerobic zone water inlet 216 is arranged at the upper part of the side wall of the first facultative anaerobic zone 211, the regulating tank 100 is communicated with the facultative anaerobic zone water inlet 216 through the lifting pump 110, and then is communicated with the facultative anaerobic zone water outlet 217 through the first facultative anaerobic zone 211, the second facultative anaerobic zone 212 in turn.

[0086] Referring to FIG. 2, in the embodiment, the third biological fluidization wall 260 is arranged in the oxidation zone 230, and the oxidation zone backflow pump, the oxidation zone water pump 231, the oxidation zone sludge pump 232 and the oxidation zone backflushing pump 233 are arranged in the oxidation zone 230 respectively, and the oxidation zone backflushing pump 233 is arranged close to the third biological fluidization wall 260. The third biological fluidization wall 260 is backflushed by the oxidation zone backflushing pump 233.

[0087] Specifically, the oxidation zone 230 is located at the leftmost end of the M-process biochemical tank 200, and the third biological fluidization wall 260 is arranged in the longitudinal water flow direction or the left-right direction of the M-process biochemical tank, the third biological fluidization wall 260 is located at the center position of the oxidation zone 230, and the third biological fluidization wall 260 is disconnected with the side walls around the oxidation zone 230. The oxidation zone backflushing pump 233 is located at the bottom of the oxidation zone 230, the oxidation zone water pump 231 is located at the middle height of the oxidation zone 230, and the oxidation zone sludge pump 232 is arranged on both sides of the third biological fluidization wall 260.

[0088] In implementation, the oxidation zone 230 is the core area of the M-process biochemical tank 200, and its main functions are to carry out pulse type timed anoxic aeration and timed aerobic aeration, remove BOD5, and realize backflow, sedimentation, water drainage and sludge discharge functions.

[0089] Referring to FIG. 3, multiple sets of aeration mechanisms are arranged in the oxidation zone 230, preferably three sets, and the three sets of aeration mechanisms are arranged in U-shaped or C-shaped structures, and the third biological fluidization wall 260 is arranged in the opening of the U-shaped or C-shaped structure. The aeration mechanisms are arranged in this way to leave a path for microorganisms to enter and exit the third biological fluidization wall 260, forming an aeration transition space. Each set of aeration mechanisms includes multiple parallel aeration pipes 234, a gas storage tank 700 and a fan 710 (or an air compressor) are arranged outside the M-process biochemical tank 200, the fan 710 is connected with the gas storage tank 700, and the gas storage tank 700 is communicated with the aeration pipes 234 through an air inlet electromagnetic valve 720.

[0090] Referring to Fig. 9, in the embodiment, the regulating tank 100 is provided with a regulating tank liquid level switch 120; the oxidation zone 230 is provided with an oxidation zone liquid level switch 235 and a DO dissolved oxygen sensor 236 respectively; and the oxidation zone 230 and the first facultative anaerobic zone 211 are further provided with an oxidation zone backflow pump 500.

[0091] The oxidation zone liquid level switch 235 is used to control the liquid level in the oxidation zone 230, i.e. the liquid level in the M process biochemical tank 200; the DO dissolved oxygen sensor 236 is used to control the dissolved oxygen content in the oxidation zone 230, i.e. the aeration range; and the oxidation zone backflow pump 500 is used to backflow the treated mixed liquid in the oxidation zone 230 to the facultative anaerobic zone 210 for stirring denitrification and phosphorus release.

[0092] The oxidation zone 230 is communicated with the ultraviolet sterilizer 400 through an oxidation zone drainage pump 231; the oxidation zone 230 is communicated with the sludge tank 300 through an oxidation zone sludge pump 232; and the facultative anaerobic zone 210 is communicated with the sludge tank 300 through a facultative anaerobic zone sludge pump 213.

[0093] In the embodiment, a backflow flowmeter 600 is arranged between the oxidation zone backflow pump 500 and the first facultative anaerobic zone 211.

[0094] In the embodiment, the M process biochemical tank 200 mainly consists of three functional zones, i.e. the facultative anaerobic zone 210, the biological selection zone 220 and the oxidation zone 230; the biological selection zone 220 and the oxidation zone 230 are communicated through a second biological fluidized wall 250; the pretreated sewage from the regulating tank 100 enters the first facultative anaerobic zone 211, is deflected by the first biological fluidized wall 240, enters the second facultative anaerobic zone 212, then flows into the biological selection zone 220, and finally enters the oxidation zone 230 through the communication hole 251.

[0095] In the embodiment, the first biological fluidized wall 240, the second biological fluidized wall 250 and the third biological fluidized wall 260 have the same structure.

[0096] Specifically, the biological fluidized wall is a concrete partition wall with stainless steel biological fence frames hung on both sides, and the fence frames are filled with suspended fluidized balls with a diameter of 60mm to 100mm; the bottom of the biological fluidized wall is provided with corresponding backflush pumps. The height of the biological fence frame is from 0.5m to 1m from the bottom of the M process biochemical tank 200 to the liquid level line when the oxidation zone 230 is full of water; and the width of the biological fence frame is consistent with the width of the concrete partition wall.

[0097] Embodiment 2

[0098] The organic wastewater treatment system provided in the embodiment further comprises an M-process PLC central control system 800; the M-process PLC central control system 800 is connected with the adjusting tank liquid level switch 120, the backflow flowmeter 600, the facultative anaerobic zone sludge discharge pump 213, the facultative anaerobic zone stirrer 214, the facultative anaerobic zone backwash flow pump 215, the biological selection zone backwash flow pump 221, the oxidation zone backflow pump 500, the oxidation zone drainage pump 231, the oxidation zone sludge discharge pump 232, the oxidation zone backwash flow pump 233, the oxidation zone liquid level switch 235, the DO dissolved oxygen sensor 236 and the air inlet electromagnetic valve 720.

[0099] In the embodiment, the function of the M-process PLC central control system 800 is to realize the collection of various data in the biochemical treatment of wastewater, and to control various devices according to the collected data.

[0100] Referring to FIG. 9, the organic wastewater treatment system provided in the embodiment further comprises a data collection module connected with the M-process PLC central control system 800.

[0101] In the embodiment, the data collection module is used to realize the collection of data signals in the biochemical treatment system, and to transmit the collected data signals to the M-process PLC central control system 800. Specifically, the data collection module is connected with the backflow flowmeter 600, the adjusting tank liquid level switch 120, the oxidation zone liquid level switch 235 and the DO dissolved oxygen sensor 236.

[0102] Referring to FIG. 9, the M-process PLC central control system 800 comprises a working time control flow module one and a working time control flow module two; the functions of the working time control flow module one and the working time control flow module two are to realize the sequencing batch biochemical treatment of organic wastewater under the condition that the supply of organic wastewater is sufficient, and they are respectively connected with the air inlet electromagnetic valve 720, the facultative anaerobic zone sludge discharge pump 213, the facultative anaerobic zone stirrer 214, the facultative anaerobic zone backwash flow pump 215, the biological selection zone backwash flow pump 221, the oxidation zone drainage pump 231, the oxidation zone sludge discharge pump 232, the oxidation zone backwash flow pump 233 and the oxidation zone backflow pump 500, to control the stirring, sludge discharge and backwash flow in the facultative anaerobic zone 210, to control the backwash flow in the biological selection zone 220, to control the aeration, backwash flow, backflow, drainage, sludge discharge in the oxidation zone 230, and to control the backflow of the mixed liquid in the oxidation zone 230 to the facultative anaerobic zone 210.

[0103] In the embodiment, the M-process PLC central control system 800 is used to accept the data signals transmitted back by the data collection module, to compare and judge with the set value, and to start and stop the related devices in the M-process biochemical tank.

[0104] In the embodiment, the control principle of the M-process PLC central control system 800 is that the data acquisition module acquires the liquid level switch signal of the adjusting tank and the liquid level switch signal of the oxidation zone, and the M-process PLC central control system 800 receives the liquid level signal of the adjusting tank liquid level switch 120, and in the case that the supply of organic sewage in the adjusting tank is sufficient, the working time control flow module one or the working time control flow module two is started.

[0105] Referring to FIG. 8, in the embodiment, the working time control flow module one and the working time control flow module two, in the case that the supply of organic sewage in the adjusting tank is sufficient, when the BOD5 content in the sewage is 0-300 mg / L, the working time control flow module one is started, and at this time, the corresponding sewage treatment process is the working time sequence process mode one; when the BOD5 content in the sewage is greater than or equal to 300 mg / L, the working time control flow module two is started, and at this time, the corresponding sewage treatment process is the working time sequence process mode two.

[0106] The organic sewage treatment system provided in the embodiment further comprises a feeding tank 900, a first feeding pump 910, a first feeding flowmeter 920, a second feeding pump 930 and a second feeding flowmeter 940; the feeding tank 900 is communicated with the facultative anaerobic zone 210 through the first feeding pump 910 and the first feeding flowmeter 920; and the feeding tank 900 is communicated with the oxidation zone 230 through the second feeding pump 930 and the second feeding flowmeter 940.

[0107] Referring to FIG. 8, in the embodiment, the M-process PLC central control system 800 further comprises a self-circulation time control flow module one and a self-circulation time control flow module two.

[0108] Referring to FIG. 10, the functions of the self-circulation time control flow module one and the self-circulation time control flow module two are to realize self-circulation biochemical treatment in the case that the supply of organic sewage is insufficient. The self-circulation time control flow module one and the self-circulation time control flow module two are respectively connected with the air inlet electromagnetic valve 720, the facultative anaerobic zone sludge discharge pump 213, the facultative anaerobic zone stirrer 214, the facultative anaerobic zone backwash flow pump 215, the biological selection zone backwash flow pump 221, the oxidation zone sludge discharge pump 232, the oxidation zone backwash flow pump 233, the oxidation zone backflow pump 500, the first feeding pump 910 and the second feeding pump 930, to correspondingly control the air inlet amount during aeration, control the stirring, sludge discharge and backwash flow in the facultative anaerobic zone 210, control the backwash flow in the biological selection zone 220, realize aeration, backwash flow, backflow and sludge discharge in the oxidation zone 230, and control the addition of materials in the feeding tank 900.

[0109] In this embodiment, the carbon-nitrogen compound nutrient solution is stored in the feeding tank 900; the first feeding flowmeter 920 and the second feeding flowmeter 940 are connected with the M-process PLC central control system 800 through the data acquisition module. When the supply of the organic wastewater is insufficient, the materials in the feeding tank 900 are added into the oxidation zone 230 and the facultative anaerobic zone 210 respectively for self-circulation biochemical treatment, so as to ensure the stability of the system.

[0110] In this embodiment, the M-process PLC central control system 800 further comprises a self-circulation time-controlled flow module one and a self-circulation time-controlled flow module two. The control principle is that the data acquisition module collects the liquid level switch signal of the adjusting pool and the liquid level switch signal of the oxidation zone. When the M-process PLC central control system 800 receives the lower limit signal of the liquid level returned by the adjusting pool liquid level switch 120, and no feedback signal is returned by the oxidation zone liquid level switch 235, it is indicated that the supply of the organic wastewater is insufficient. The M-process PLC central control system 800 automatically starts the self-circulation time-controlled flow module one or the self-circulation time-controlled flow module two.

[0111] In this embodiment, the self-circulation time-controlled flow module one and the self-circulation time-controlled flow module two correspond to the self-circulation time sequence process mode one and the self-circulation time sequence process mode two respectively. In the case that the supply of the organic wastewater in the adjusting pool is insufficient, any one of the modes can be started to realize self-circulation biochemical treatment.

[0112] Embodiment 3

[0113] In this embodiment, the organic wastewater treatment is realized according to the working time sequence process mode one.

[0114] In this embodiment, in the case that the supply of the organic wastewater in the adjusting pool 100 is sufficient (according to whether the liquid level of the adjusting pool liquid level switch 120 reaches the lower limit) and the BOD5 content in the organic wastewater is within 0-300 mg / L (the BOD5 content range is different due to factors such as temperature, regional altitude, water quality, etc. in different seasons, and the BOD5 content range provided in this embodiment is measured when the water temperature is 12℃ and the average altitude is 200 meters), the working time sequence process mode one is adopted for organic wastewater treatment.

[0115] Referring to FIG. 4, the organic wastewater treatment process provided in this embodiment comprises the following steps:

[0116] S1, water inlet

[0117] The organic wastewater is introduced into the M-process biochemical pool 200 until the liquid level of the oxidation zone 230 reaches the maximum, and the water inlet is stopped.

[0118] Specifically, the organic sewage after pretreatment (grid, sand treatment) enters the adjusting tank 100, the organic sewage in the adjusting tank 100 enters the first facultative anaerobic zone 211 from the facultative anaerobic zone water inlet 216, is folded after the first biological fluid wall 240, enters the second facultative anaerobic zone 212, and finally enters the oxidation zone 230 through the facultative anaerobic zone water outlet 217, the biological selection zone 220 and the communication hole 251. With the continuous entry of the organic sewage, the water level switch 235 in the oxidation zone reaches the upper limit, and the water inlet is stopped.

[0119] S2, according to the set aeration program, the organic sewage in the oxidation zone 230 is subjected to timed pulse intermittent aeration treatment; while the aeration treatment is being carried out, the organic sewage in the facultative anaerobic zone 210 is subjected to timed stirring denitrification and phosphorus release treatment, and the biological fluid wall in the M process biochemical tank 200 is subjected to timed backflow treatment; until the aeration program is executed, the sequencing batch biochemical treatment of the organic sewage is completed; the aeration program includes timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux, timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux and timed aerobic aeration in time sequence. Specifically as follows:

[0120] S21, timed aerobic aeration (aeration 0): the M process PLC central control system 800 controls the opening of the air inlet electromagnetic valve 720 of the gas storage tank 700, the oxidation zone 230 starts pulse intermittent timed aerobic aeration (marked as aeration 0), and the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221 and the oxidation zone backflow pump 233 are opened to carry out timed backflow of the biological fluid wall in each functional zone (marked as backflow 0), and the facultative anaerobic zone stirrer 214 is opened to carry out timed stirring of the facultative anaerobic zone (marked as stirring 0), and the denitrification and phosphorus release process is completed; when the DO dissolved oxygen reaches the upper limit value (5 mg / L) of aerobic aeration, the air inlet electromagnetic valve 720 is closed, and when the DO dissolved oxygen reaches the lower limit value (1 mg / L) of aerobic aeration, the air inlet electromagnetic valve 720 is opened for aeration until the aerobic aeration time is up; the air inlet electromagnetic valve 720, the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221, the oxidation zone backflow pump 233 and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone reflux pump 500 is started for quantitative reflux (reflux 1), and when the reflux flow meter 600 reaches the upper limit (the reflux ratio is 1 / 3-1 / 2 of the oxidation zone volume), the oxidation zone reflux pump 500 is closed.

[0121] S22, timed anoxic aeration (aeration 1): after the end of reflux 1, the mixed liquor in the oxidation zone 230 is subjected to pulsed intermittent timed anoxic aeration (denoted as aeration 1), the air inlet solenoid valve 720 is opened, and at the same time, the facultative anaerobic zone stirrer 214 is started to perform timed stirring in the facultative anaerobic zone 210 (denoted as stirring 1), to complete the denitrification and phosphorus release process; and at the same time, the facultative anaerobic zone backwash flow pump 215, the biological selection zone backwash flow pump 221, and the oxidation zone backwash flow pump 233 are started to perform timed backwash flow (denoted as backwash flow 1) in the biological fluidized wall in each functional zone. When the DO dissolved oxygen reaches the upper limit value (1 mg / L) of anoxic aeration, the air inlet solenoid valve 720 is closed; when the DO dissolved oxygen reaches the lower limit value (0.1 mg / L) of anoxic aeration, the air inlet solenoid valve 720 is opened. After repeated multiple times, until the timing is over; the air inlet solenoid valve 720, the facultative anaerobic zone backwash flow pump 215, the biological selection zone backwash flow pump 221, the oxidation zone backwash flow pump 233, and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone reflux pump 500 is started to perform quantitative reflux (reflux 2). When the upper limit set by the reflux flow meter 600 (the reflux ratio is 1 / 3-1 / 2 of the volume of the oxidation zone) is reached, the oxidation zone reflux pump 500 is closed.

[0122] S23, timed aerobic aeration (aeration 2): after the end of reflux 2, the air inlet solenoid valve 720 of the gas storage tank 700 is opened, the mixed liquor in the oxidation zone 230 is subjected to pulsed intermittent timed aerobic aeration (denoted as aeration 2), and at the same time, the facultative anaerobic zone backwash flow pump 215, the biological selection zone backwash flow pump 221, and the oxidation zone backwash flow pump 233 are opened to perform timed backwash flow (denoted as backwash flow 2) in the biological fluidized wall in each functional zone, and at the same time, the facultative anaerobic zone stirrer 214 is opened to perform timed stirring (denoted as stirring 2) in the facultative anaerobic zone, to complete the denitrification and phosphorus release process; when the DO dissolved oxygen reaches the upper limit value (5 mg / L) of aerobic aeration, the air inlet solenoid valve 720 is closed, and when the DO dissolved oxygen reaches the lower limit value (1 mg / L) of aerobic aeration, the air inlet solenoid valve 720 is opened for aerobic aeration, until the timing is over, the air inlet solenoid valve 720, the facultative anaerobic zone backwash flow pump 215, the biological selection zone backwash flow pump 221, the oxidation zone backwash flow pump 233, and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone reflux pump 500 is started to perform quantitative reflux (reflux 3). When the upper limit set by the reflux flow meter 600 (the reflux ratio is 1 / 3-1 / 2 of the volume of the oxidation zone) is reached, the oxidation zone reflux pump 500 is closed.

[0123] S24, timing anoxic aeration (aeration 3): after the end of reflux 3, the mixed liquor in the oxidation zone 230 is subjected to pulse intermittent timing anoxic aeration (denoted as aeration 3), and at the same time, the facultative anaerobic zone stirrer 214 is started to perform timing stirring (denoted as stirring 3) on the facultative anaerobic zone 210 to complete the denitrification and phosphorus release process, and at the same time, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, and the oxidation zone backwash pump 233 are started to perform timing backwash on the biological fluidized wall in each functional zone (denoted as backwash 3). When the DO dissolved oxygen reaches the upper limit value (1 mg / L) of anoxic aeration, the air inlet solenoid valve 720 is closed; when the DO dissolved oxygen reaches the lower limit value (0.1 mg / L) of anoxic aeration, the air inlet solenoid valve 720 is opened. After repeated several times, until the timing is completed, the air inlet solenoid valve 720, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, the oxidation zone backwash pump 233, and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone reflux pump 500 is started to perform quantitative reflux (reflux 4), and when the upper limit set by the reflux flowmeter 600 (the reflux ratio is 1 / 3-1 / 2 of the volume of the oxidation zone) is reached, the oxidation zone reflux pump 500 is closed.

[0124] S25, timing aerobic aeration (aeration 4): after the end of reflux 4, the air inlet solenoid valve 720 of the gas storage tank 700 is opened, and the mixed liquor in the oxidation zone 230 is subjected to pulse intermittent timing aerobic aeration (denoted as aeration 4), and at the same time, the facultative anaerobic zone stirrer 214 is started to perform timing stirring (denoted as stirring 4) on the facultative anaerobic zone 210 to complete the denitrification and phosphorus release process; and at the same time, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, and the oxidation zone backwash pump 233 are started to perform timing backwash (denoted as backwash 4) on the biological fluidized wall in each functional zone. When the DO dissolved oxygen reaches the upper limit value (5 mg / L) of aerobic setting, the air inlet solenoid valve 720 is closed; when the DO dissolved oxygen reaches the lower limit value (1 mg / L) of aerobic setting, the air inlet solenoid valve 720 is opened. After repeated several times, until the timing is completed, the air inlet solenoid valve 720, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, the oxidation zone backwash pump 233, and the facultative anaerobic zone stirrer 214 are closed, and the biochemical treatment is completed.

[0125] In steps S21-S25, the range of aerobic aeration is 1 mg / L-5 mg / L, the range of anoxic aeration is 0.1 mg / L-1 mg / L, the time of timing aerobic aeration is 1 h-2 h, the time of timing anoxic aeration is 1 h-2 h, and the reflux ratio is 1 / 3-1 / 2 of the volume of the oxidation zone 230.

[0126] In this step of biochemical treatment, aeration is performed five times, backwash is performed five times, stirring is performed five times, and reflux is performed four times to complete the biochemical treatment of organic wastewater.

[0127] S3, sedimentation, drainage, sludge discharge

[0128] After the biochemical treatment of step S2 is completed, a sedimentation period is entered, the sedimentation time is 0.5h, and the longest is 1h, to obtain upper liquid and lower sludge; the upper liquid is disinfected by the ultraviolet sterilizer 400 to obtain clean water; and the lower sludge is discharged to the artificial wetland for reuse.

[0129] Specifically, after the sedimentation is completed, the M-process PLC central control system 800 starts the oxidation zone drainage pump 231 to perform drainage (the oxidation zone drainage pump 231 is installed at the middle height of the oxidation zone 230), and simultaneously starts the ultraviolet sterilizer 400 to work, the upper liquid is subjected to ultraviolet disinfection treatment by the ultraviolet sterilizer 400 to obtain clean water, until the liquid level measured by the oxidation zone liquid level switch 235 reaches the lower limit, the oxidation zone drainage pump 231 and the ultraviolet sterilizer 400 are turned off. After the drainage is completed, the M-process PLC central control system 800 simultaneously starts the facultative anaerobic zone sludge discharge pump 213 and the oxidation zone sludge discharge pump 232 to discharge the lower sludge into the sludge tank 300 for use in the artificial wetland.

[0130] It is calculated that the treated drainage water quality indexes are: BOD5<9mg / L, total nitrogen TN<13mg / L, total phosphorus TP<0.4mg / L, and ammonia nitrogen NH3-N<4mg / L, which are higher than the national first A sewage discharge standard. The process of the present application can completely biologically treat organic wastewater without adding flocculants, precipitants, phosphorus removal agents, and disinfectants, greatly reducing the treatment cost.

[0131] In the present embodiment, the sewage is treated for one treatment cycle from water inletting, biochemical treatment, sedimentation, drainage, and sludge discharge, and the treatment time for one cycle is 6h-10h, after which the next treatment cycle is entered.

[0132] Embodiment 4

[0133] In the present embodiment, the organic wastewater treatment is implemented according to the working time sequence process mode two. In the present embodiment, when the supply of the organic wastewater in the adjusting tank 100 is sufficient, and the BOD5 content in the organic wastewater is greater than or equal to 300mg / L (the BOD5 content range is different due to factors such as temperature, regional altitude, and water quality in different seasons, the BOD5 content range provided in the present embodiment is measured at a water temperature of 12℃ and an average altitude of 200m), the working time sequence process mode two is used for organic wastewater treatment.

[0134] Referring to FIG. 5, the treatment process of the working time sequence process mode two includes the following steps:

[0135] S1, water inletting

[0136] The organic wastewater is introduced into the M-process biochemical tank 200 until the liquid level of the oxidation zone 230 reaches the maximum, and the water inletting is stopped.

[0137] Specifically, the pretreated organic sewage enters the adjusting tank 100, and the organic sewage in the adjusting tank 100 enters the first facultative anaerobic zone 211 from the facultative anaerobic zone water inlet 216 through the lifting pump 110, is folded after the first biological fluidized wall 240, enters the second facultative anaerobic zone 212, and finally enters the oxidation zone 230 through the facultative anaerobic zone water outlet 217, the biological selection zone 220 and the communication hole 251. With the continuous entry of the organic sewage, the water level switch 235 in the oxidation zone stops water entry when reaching the upper limit.

[0138] S2, according to the set aeration program, the organic sewage in the oxidation zone 230 is subjected to timed pulse intermittent aeration treatment; while the aeration treatment is being performed, the organic sewage in the facultative anaerobic zone 210 is subjected to timed stirring denitrification and phosphorus release treatment, and the biological fluidized walls in the M process biochemical tank 200 are subjected to timed backflow treatment; until the aeration program is executed, the sequencing batch biochemical treatment of the organic sewage is completed.

[0139] The aeration program includes timed anoxic aeration, quantitative reflux, timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux, timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux, and timed aerobic aeration in time sequence; specifically as follows:

[0140] S21, timed anoxic aeration (aeration 0): open the air inlet electromagnetic valve 720 on the gas storage tank 700, start the pulse intermittent timed anoxic aeration of the oxidation zone (denoted as aeration 0), and simultaneously open the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221 and the oxidation zone backflow pump 233 to perform timed backflow (denoted as backflow 0) on the biological fluidized walls in each functional zone, and simultaneously open the facultative anaerobic zone stirrer 214 to perform timed stirring (denoted as stirring 0), complete the denitrification and phosphorus release process; when the DO dissolved oxygen reaches the upper limit value (1 mg / L) of the anoxic aeration, close the air inlet electromagnetic valve 720; when the DO dissolved oxygen reaches the lower limit value (0.1 mg / L) of the anoxic aeration, open the air inlet electromagnetic valve 720 for aeration, until the timing is completed, the air inlet electromagnetic valve 720, the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221 and the oxidation zone backflow pump 233 are closed, and the oxidation zone reflux pump 500 is started for quantitative reflux (reflux 1); when the reflux flow meter 600 reaches the upper limit (the reflux ratio is 1 / 3-1 / 2 of the oxidation zone volume), the oxidation zone reflux pump 500 is closed.

[0141] S22, timed aerobic aeration (aeration 1): after the end of reflux 1, the inlet air solenoid valve 720 on the gas tank 700 is opened, the mixed liquor in the oxidation zone 230 enters the pulse intermittent timed aerobic aeration (denoted as aeration 1), and at the same time the facultative anaerobic zone stirrer 214 is started to perform timed stirring (denoted as stirring 1) on the facultative anaerobic zone 210 to complete the denitrification and phosphorus release process; and at the same time the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221 and the oxidation zone backwash pump 233 are started to perform timed backwash flow on the biological fluidized wall in each functional zone (denoted as backwash flow 1). When the DO dissolved oxygen reaches the upper limit value (5 mg / L) of aerobic aeration, the inlet air solenoid valve 720 is closed; when the DO dissolved oxygen reaches the lower limit value (1 mg / L) of aerobic aeration, the inlet air solenoid valve 720 is opened. After repeated several times, the inlet air solenoid valve 720, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, the oxidation zone backwash pump 233 and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone reflux pump 500 is started to perform quantitative reflux (reflux 2), and when the upper limit set by the reflux flowmeter 600 (the reflux ratio is 1 / 3-1 / 2 of the oxidation zone volume) is reached, the oxidation zone reflux pump 500 is closed.

[0142] S23, timed anoxic aeration (aeration 2): after the end of reflux 2, the mixed liquor in the oxidation zone 230 is subjected to pulse intermittent timed anoxic aeration (denoted as aeration 2), and the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221 and the oxidation zone backwash pump 233 are opened to perform timed backwash flow (denoted as backwash flow 2) on the biological fluidized wall in each functional zone, and at the same time the facultative anaerobic zone stirrer 214 is opened to perform timed stirring (denoted as stirring 2) to complete the denitrification and phosphorus release process; when the DO dissolved oxygen reaches the upper limit value (1 mg / L) of anoxic aeration, the inlet air solenoid valve 720 is closed, and when the DO dissolved oxygen reaches the lower limit value (0.1 mg / L) of anoxic aeration, the inlet air solenoid valve 720 is opened for aeration, until the end of timing, the inlet air solenoid valve 720, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, the oxidation zone backwash pump 233 and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone reflux pump 500 is started to perform quantitative reflux (reflux 3), and when the upper limit set by the reflux flowmeter 600 (the reflux ratio is 1 / 3-1 / 2 of the oxidation zone volume) is reached, the oxidation zone reflux pump 500 is closed.

[0143] S24, timed aerobic aeration (aeration 3): after the end of reflux 3, the mixed liquor in the oxidation zone 230 enters the pulse intermittent timed aerobic aeration (denoted as aeration 3), the air inlet solenoid valve 720 is opened, and at the same time, the facultative anaerobic zone stirrer 214 is started to perform timed stirring on the facultative anaerobic zone 210 (denoted as stirring 3), the denitrification and phosphorus release process is completed, and at the same time, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, and the oxidation zone backwash pump 233 are started to perform timed backwash on the biological fluidized wall in each functional zone (denoted as backwash 3). When the DO dissolved oxygen reaches the upper limit value (5 mg / L) of the aerobic aeration, the air inlet solenoid valve 720 is closed; when the DO dissolved oxygen reaches the lower limit value (1 mg / L) of the aerobic aeration, the air inlet solenoid valve 720 is opened. After repeated several times, the air inlet solenoid valve 720, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, the oxidation zone backwash pump 233, and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone reflux pump 500 is started to perform quantitative reflux (reflux 4). When the upper limit set by the reflux flowmeter 600 (the reflux ratio is 1 / 3-1 / 2 of the oxidation zone volume) is reached, the oxidation zone reflux pump 500 is closed.

[0144] S25, timed anoxic aeration (aeration 4): after the end of reflux 4, the mixed liquor in the oxidation zone 230 enters the pulse intermittent timed anoxic aeration (denoted as aeration 4), and the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, and the oxidation zone backwash pump 233 are opened to perform timed backwash on the biological fluidized wall in each functional zone (denoted as backwash 4), and at the same time, the facultative anaerobic zone stirrer 214 is opened to perform timed stirring on the facultative anaerobic zone (denoted as stirring 4), the denitrification and phosphorus release process is completed, and when the DO dissolved oxygen reaches the upper limit value (1 mg / L) of the anoxic aeration, the air inlet solenoid valve 720 is closed, and when the DO dissolved oxygen reaches the lower limit value (0.1 mg / L) of the anoxic aeration, the air inlet solenoid valve 720 is opened for aeration. After repeated several times, the air inlet solenoid valve 720, the facultative anaerobic zone backwash pump 215, the biological selection zone backwash pump 221, the oxidation zone backwash pump 233, and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone reflux pump 500 is started to perform quantitative reflux (reflux 5). When the upper limit set by the reflux flowmeter 600 (the reflux ratio is 1 / 3-1 / 2 of the oxidation zone volume) is reached, the oxidation zone reflux pump 500 is closed.

[0145] S26, timed aerobic aeration (aeration 5): after the reflux 5, the mixed liquor in the oxidation zone 230 enters the pulse intermittent timed aerobic aeration (denoted as aeration 5), the air inlet solenoid valve 720 is opened, and the facultative anaerobic zone stirrer 214 in the facultative anaerobic zone 210 is started for timed stirring (denoted as stirring 5), the denitrification and phosphorus release process is completed, and at the same time, the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221 and the oxidation zone backflow pump 233 are started for timed backflow of the biological fluidized wall in each functional zone (denoted as backflow 5). When the DO dissolved oxygen reaches the upper limit value (5 mg / L) of the aerobic aeration, the air inlet solenoid valve 720 is closed; when the DO dissolved oxygen reaches the lower limit value (1 mg / L) of the aerobic aeration, the air inlet solenoid valve 720 is opened. After repeated several times, the air inlet solenoid valve 720, the facultative anaerobic zone backflow pump 215, the facultative anaerobic zone stirrer 214, the biological selection zone backflow pump 221 and the oxidation zone backflow pump 233 are closed.

[0146] In steps S21-S26 of the embodiment, the range of aerobic aeration is 1 mg / L-5 mg / L, the range of anoxic aeration is 0.1 mg / L-1 mg / L, the time of timed aerobic aeration is 1 h-2 h, the time of timed anoxic aeration is 1 h-2 h, and the reflux ratio is 1 / 3-1 / 2 of the volume of the oxidation zone 230.

[0147] In this step, the aeration is performed six times, the backflow is performed six times, the stirring is performed six times, and after the reflux is performed five times, the sewage biochemical treatment is completed.

[0148] S3, sedimentation, water drainage and sludge discharge

[0149] After the biochemical treatment of step S2 is completed, the M-process biochemical tank 200 is sedimented for 0.5 h-1 h to obtain upper liquid and lower sludge; the upper liquid is disinfected by the ultraviolet sterilizer 400 to obtain clean water; and the lower sludge is discharged to the artificial wetland for reuse.

[0150] After the sedimentation is completed, the M-process PLC central control system 800 starts the oxidation zone drainage pump 231 for drainage (the oxidation zone drainage pump 231 is installed at the middle height of the oxidation zone 230), and simultaneously starts the ultraviolet sterilizer 400 to work, the upper liquid is treated by ultraviolet disinfection by the ultraviolet sterilizer 400 to obtain clean water, until the lower limit of the oxidation zone liquid level switch 235 is reached, the oxidation zone drainage pump 231 and the ultraviolet sterilizer 400 are closed. After the drainage is completed, the M-process PLC central control system 800 simultaneously starts the facultative anaerobic zone sludge pump 213 and the oxidation zone sludge pump 232 for sludge discharge, which is discharged into the sludge tank 300 for use in the artificial wetland.

[0151] The calculated water quality indexes of the treated drainage are: BOD5 < 9 mg / L, total nitrogen TN < 13 mg / L, total phosphorus TP < 0.4 mg / L, and ammonia nitrogen NH3-N < 4 mg / L, which are higher than the national first A sewage discharge standard. The process of the application can completely biologically treat the organic sewage without adding flocculants, precipitants, phosphorus removal agents and disinfectants, greatly reducing the treatment cost. In the embodiment, the sewage is treated in one treatment cycle including water inletting, biochemical treatment, sedimentation, drainage and sludge discharge, and the treatment time of one cycle is 6-10 hours, and then the next treatment cycle is started.

[0152] Example 5

[0153] In the embodiment, the treatment process of the self-circulation time sequence process mode one includes the following steps:

[0154] In the embodiment, the treatment process of the self-circulation time sequence process mode one includes the following steps:

[0155] S1, the first feeding pump 910 and the second feeding pump 930 are started to feed the material (carbon-nitrogen compound nutrient solution) in the feeding tank 900 into the oxidation zone 230 and the facultative anaerobic zone 210, respectively, and the feeding is stopped when the set upper limit of the first feeding flowmeter 920 and the set upper limit of the second feeding flowmeter 940 are reached. The set upper limit is calculated according to the BOD5 sludge load.

[0156] S2, the carbon-nitrogen compound nutrient solution and the organic mixed solution formed by the organic sewage in the M-process biochemical tank 200 are subjected to timed pulse intermittent aeration treatment in the oxidation zone 230 according to the set aeration program; at the same time of the aeration treatment, the organic mixed solution in the facultative anaerobic zone 210 is subjected to timed stirring denitrification and phosphorus release treatment, and the biological fluidized wall in the M-process biochemical tank 200 is subjected to timed backwashing flow treatment; until the aeration program is executed, the self-circulation treatment of the organic mixed solution is completed; the aeration program includes timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux, timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux and timed aerobic aeration in time sequence; the specific process is as follows:

[0157] S21, timed aerobic aeration (aeration 0): open the air inlet solenoid valve 720 of the gas tank 700, the oxidation zone is subjected to pulse intermittent timed aerobic aeration (denoted as aeration 0), and the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221 and the oxidation zone backflow pump 233 are opened to perform timed backflow to the biological fluidized wall in each functional zone (denoted as backflow 0), at the same time, the facultative anaerobic zone stirrer 214 is opened to perform timed stirring to the facultative anaerobic zone (denoted as stirring 0), and the denitrification and phosphorus release process is completed; when the DO dissolved oxygen reaches the upper limit value (5 mg / L) of the aerobic aeration, the air inlet solenoid valve 720 is closed, when the DO dissolved oxygen reaches the lower limit value (1 mg / L) of the aerobic aeration, the air inlet solenoid valve 720 is opened, until the timing is completed, the air inlet solenoid valve 720, the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221, the oxidation zone backflow pump 233 and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone backflow pump 500 is started to perform quantitative backflow (backflow 1), when the upper limit set by the backflow flowmeter 600 (1 / 3-1 / 2 of the volume of the oxidation zone) is reached, the oxidation zone backflow pump 500 is closed.

[0158] S22, timed anoxic aeration (aeration 1): after the backflow 1 is completed, the mixed liquor in the oxidation zone 230 enters the pulse intermittent timed anoxic aeration (denoted as aeration 1), the air inlet solenoid valve 720 is opened, and the facultative anaerobic zone stirrer 214 is started to perform timed stirring to the facultative anaerobic zone 210 (denoted as stirring 1), the denitrification and phosphorus release process is completed, and at the same time, the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221 and the oxidation zone backflow pump 233 are started to perform timed backflow to the biological fluidized wall in each functional zone (denoted as backflow 1). When the DO dissolved oxygen reaches the upper limit value (1 mg / L) of the anoxic aeration, the air inlet solenoid valve 720 is closed; when the DO dissolved oxygen reaches the lower limit value (0.1 mg / L) of the anoxic aeration, the air inlet solenoid valve 720 is opened. After repeated for many times, until the timing is completed, the air inlet solenoid valve 720, the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221, the oxidation zone backflow pump 233 and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone backflow pump 500 is started to perform quantitative backflow (backflow 2), when the upper limit set by the backflow flowmeter 600 (1 / 3-1 / 2 of the volume of the oxidation zone) is reached, the oxidation zone backflow pump 500 is closed.

[0159] S23, timed aerobic aeration (aeration 2): refer to the pulse intermittent timed aerobic aeration in step S21, and at the same time, perform timed backflow (denoted as backflow 2) to the biological fluidized wall of each functional area, and at the same time, perform timed stirring (denoted as stirring 2) to the facultative anaerobic area, complete the denitrification and phosphorus release process; until the end of the timing, close the air inlet electromagnetic valve 720, the facultative anaerobic area backflow pump 215, the biological selection area backflow pump 221, the oxidation area backflow pump 233 and the facultative anaerobic area stirrer 214, and start the oxidation area backflow pump 500 to perform quantitative backflow (backflow 3), and when the backflow reaches the upper limit of the backflow flow meter 600 (1 / 3-1 / 2 of the volume of the oxidation area), the oxidation area backflow pump 500 is closed.

[0160] S24, timed anoxic aeration (aeration 3): refer to the pulse intermittent timed anoxic aeration in step S22, and at the same time, perform timed backflow (denoted as backflow 3) to the biological fluidized wall of each functional area, and at the same time, perform timed stirring (denoted as stirring 3) to the facultative anaerobic area, complete the denitrification and phosphorus release process; until the end of the timing, close the air inlet electromagnetic valve 720, the facultative anaerobic area backflow pump 215, the biological selection area backflow pump 221, the oxidation area backflow pump 233 and the facultative anaerobic area stirrer 214, and start the oxidation area backflow pump 500 to perform quantitative backflow (backflow 4), and when the backflow reaches the upper limit of the backflow flow meter 600 (1 / 3-1 / 2 of the volume of the oxidation area), the oxidation area backflow pump 500 is closed.

[0161] S25, timed aerobic aeration (aeration 4): refer to the pulse intermittent timed aerobic aeration in step S21, and at the same time, perform timed backflow (denoted as backflow 4) to the biological fluidized wall of each functional area, and at the same time, perform timed stirring (denoted as stirring 4) to the facultative anaerobic area, complete the denitrification and phosphorus release process; until the end of the timing, close the air inlet electromagnetic valve 720, the facultative anaerobic area backflow pump 215, the biological selection area backflow pump 221, the oxidation area backflow pump 233 and the facultative anaerobic area stirrer 214.

[0162] S3, sedimentation, sludge discharge, backflow

[0163] Sedimentation for 0.5-1 h, to obtain supernatant and sludge, and the M process PLC central control system 800 simultaneously starts the facultative anaerobic area sludge discharge pump 213 and the oxidation area sludge discharge pump 232 to discharge sludge until the end of the timing (or the quantity).

[0164] S4, after the sludge discharge is completed, the supernatant in the oxidation area is backflowed (backflow 5) to the first facultative anaerobic area 211 by the oxidation area backflow pump 500.

[0165] The treatment cycle of this batch is 6-10 h, and after the end, the feeding is re-performed to enter the next cycle.

[0166] When the organic sewage in the adjusting tank 100 reaches the upper limit of the adjusting tank liquid level switch 120, the self-circulation time sequence process mode one is stopped, and then the working time sequence process mode one or the working time sequence process mode two is automatically entered.

[0167] Embodiment 6

[0168] In this embodiment, the self-circulation time sequence process mode two is used for processing.

[0169] During the water inlet process, when the liquid level in the adjusting tank 100 reaches the lower limit signal and there is no feedback signal from the oxidation zone liquid level switch 235, it indicates that the supply of organic sewage in the adjusting tank 100 is insufficient, and the lifting pump 110 is closed.

[0170] Referring to FIG. 7, the processing process of the self-circulation time sequence process mode two in this embodiment includes the following steps:

[0171] S1, the first feeding pump 910 and the second feeding pump 930 are started to add the materials (carbon-nitrogen compound nutrient solution) in the feeding tank 900 into the oxidation zone 230 and the facultative anaerobic zone 210 respectively, and the feeding is stopped when the set value upper limit of the first feeding flowmeter 920 and the set value upper limit of the second feeding flowmeter 940 are reached. The set value upper limit is calculated according to the BOD5 sludge load.

[0172] S2, the carbon-nitrogen compound nutrient solution and the organic mixed liquid formed by the organic sewage in the M-process biochemical tank 200 are subjected to timed pulse intermittent aeration treatment in the oxidation zone 230 according to the set aeration program; at the same time of the aeration treatment, the organic mixed liquid in the facultative anaerobic zone 210 is subjected to timed stirring denitrification and phosphorus release treatment, and the biological fluidized wall in the M-process biochemical tank 200 is subjected to timed backwashing flow treatment; until the aeration program is executed, the self-circulation processing of the organic mixed liquid is completed.

[0173] The aeration program includes timed anoxic aeration, quantitative reflux, timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux and timed aerobic aeration in time sequence, and specifically as follows:

[0174] S21, timed anoxic aeration (aeration 0): open the air inlet solenoid valve 720 of the gas tank 700, the oxidation zone is pulsed intermittent timed anoxic aeration (marked as aeration 0), while opening the backflush flow pump 215 of the facultative anaerobic zone, the backflush flow pump 221 of the biological selection zone and the backflush flow pump 233 of the oxidation zone to carry out timed backflush flow (marked as backflush flow 0) to the biological fluidized wall of each functional zone, while opening the agitator 214 of the facultative anaerobic zone to carry out timed agitation (marked as agitation 0) to the facultative anaerobic zone, to complete the denitrification and phosphorus release process; when the DO dissolved oxygen reaches the upper limit value (1 mg / L) of anoxic aeration, close the air inlet solenoid valve 720, when the DO dissolved oxygen reaches the lower limit value (0.1 mg / L) of anoxic aeration, open the air inlet solenoid valve 720 for aeration, until the end of the timing, close the air inlet solenoid valve 720, the facultative anaerobic zone backflush flow pump 215, the biological selection zone backflush flow pump 221, the oxidation zone backflush flow pump 233 and the facultative anaerobic zone agitator 214, and start the oxidation zone backflow pump 500 for quantitative backflow (backflow 1), when reaching the upper limit set by the backflow flowmeter 600 (1 / 3-1 / 2 of the oxidation zone volume), close the oxidation zone backflow pump 500.

[0175] S22, timed aerobic aeration (aeration 1): after the end of backflow 1, the mixed liquor in the oxidation zone 230 enters pulsed intermittent timed aerobic aeration (marked as aeration 1), open the air inlet solenoid valve 720, and start the facultative anaerobic zone agitator 214 to carry out timed agitation (marked as agitation 1) to the facultative anaerobic zone 210, to complete the denitrification and phosphorus release process, and at the same time start the facultative anaerobic zone backflush flow pump 215, the biological selection zone backflush flow pump 221 and the oxidation zone backflush flow pump 233 to carry out timed backflush flow (marked as backflush flow 1) to the biological fluidized wall of each functional zone. When the DO dissolved oxygen reaches the upper limit value (5 mg / L) of aerobic aeration, close the air inlet solenoid valve 720; when the DO dissolved oxygen reaches the lower limit value (1 mg / L) of aerobic aeration, open the air inlet solenoid valve 720. After repeated for many times, until the end of the timing, close the air inlet solenoid valve 720, the facultative anaerobic zone backflush flow pump 215, the biological selection zone backflush flow pump 221, the oxidation zone backflush flow pump 233 and the facultative anaerobic zone agitator 214, and start the oxidation zone backflow pump 500 for quantitative backflow (backflow 2), when reaching the upper limit set by the backflow flowmeter 600 (1 / 3-1 / 2 of the oxidation zone volume), close the oxidation zone backflow pump 500.

[0176] S23, timed anoxic aeration (aeration 2): with reference to the timed anoxic aeration in step S21, the timed backflow (denoted as backflow 2) is performed on the biological fluidized wall of each functional zone, and the timed stirring (denoted as stirring 2) is performed on the facultative anaerobic zone, to complete the denitrification and phosphorus release process; until the end of the anoxic aeration timing, the air inlet electromagnetic valve 720, the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221, the oxidation zone backflow pump 233 and the facultative anaerobic zone stirrer 214 are closed, and the oxidation zone backflow pump 500 is started for quantitative backflow (backflow 3); when the upper limit set by the backflow flowmeter 600 (1 / 3-1 / 2 of the oxidation zone volume) is reached, the oxidation zone backflow pump 500 is closed.

[0177] S24, timed aerobic aeration (aeration 3): with reference to the timed aerobic aeration in step S22, the facultative anaerobic zone 210 is subjected to timed stirring (denoted as stirring 2), to complete the denitrification and phosphorus release process, and the facultative anaerobic zone 210 is subjected to timed backflow (denoted as backflow 2) at the same time; until the end of the anoxic aeration timing, the air inlet electromagnetic valve 720, the facultative anaerobic zone backflow pump 215, the biological selection zone backflow pump 221, the oxidation zone backflow pump 233 and the facultative anaerobic zone stirrer 214 are closed.

[0178] S3, sedimentation, sludge discharge and backflow

[0179] The supernatant and sludge are obtained after sedimentation for 0.5-1 h; the PLC central control system 800 of the M process simultaneously starts the facultative anaerobic zone sludge discharge pump 213 and the oxidation zone sludge discharge pump 232 to discharge sludge, until the end of the timing (or quantification).

[0180] S4, after the sludge discharge is completed, the supernatant is backflowed (backflow 4) to the first facultative anaerobic zone by the oxidation zone backflow pump 500.

[0181] The treatment cycle of this batch is 6-10 h, and after the end of the cycle, the feeding is restarted and the next cycle is entered.

[0182] When the liquid level of the organic wastewater in the adjusting tank 100 reaches the upper limit of the adjusting tank liquid level switch 120, the self-circulation timing process mode two is stopped; then the working timing process mode one or the working timing process mode two is automatically entered.

[0183] The organic sewage treatment process provided by the application, namely M process, has four process modes and two aeration modes: working timing process mode one, working timing process mode two, self-circulation timing process mode one and self-circulation timing process mode two. The two aeration modes are timed aerobic pulse intermittent aeration and timed anoxic pulse intermittent aeration. The process has the characteristics of sequencing batch treatment, timed aerobic and timed anoxic alternating aeration, timed pulse intermittent aeration, quantitative reflux circulation aeration, quantitative reflux circulation stirring denitrification and phosphorus release. The biological selection zone and biological fluidized wall are arranged in the M process biochemical tank, and the backflush flow technology is adopted, so that the activity of microorganisms is ensured, the biological growth rate is increased by more than 30%, the aeration time is shortened by more than 20%, the efficiency is increased by more than 25% than that of the traditional single process, and the cost is reduced by more than 30%. In summary, the process provides a new way for organic sewage treatment. In the treatment of organic sewage, no chemical agent needs to be added, the effluent quality is stable, and is higher than the national first-level A discharge standard.

[0184] For those skilled in the art, any addition or reduction on the M process steps and process elements, or any combination deformation on the process steps, process elements (aeration, stirring, backflush flow, reflux), or different forms of changes and variations on the structure of the M process biochemical tank and the M process PLC central control system, and the timed aerobic pulse intermittent aeration mode and the timed anoxic pulse intermittent aeration mode, fall within the protection scope of the application.

Claims

1. A completely biological type organic sewage treatment process, characterized by, The complete biological organic wastewater treatment process, i.e. M process, has four process modes and two aeration modes, and the steps are as follows: According to the liquid level of the adjusting tank, whether the organic wastewater supply is sufficient and the BOD5 content in the organic wastewater, four process modes are selected: If the liquid level of the adjusting tank is higher than the minimum liquid level line and the BOD5 content is 0-300 mg / L, working time sequence process mode one is selected to treat the organic wastewater; If the liquid level of the adjusting tank is higher than the minimum liquid level line and the BOD5 content is greater than or equal to 300 mg / L, working time sequence process mode two is selected to treat the organic wastewater; If the liquid level of the adjusting tank is lower than the minimum liquid level line, self-circulation time sequence process mode one or self-circulation time sequence process mode two is selected for self-circulation biochemical treatment; The two aeration modes are as follows: timed aerobic pulse intermittent aeration and timed anoxic pulse intermittent aeration; The working time sequence process mode one comprises the following steps: SA1, water inlet The organic wastewater in the adjusting tank (100) is introduced into the facultative anaerobic zone (210) in the M process biochemical tank (200), and then the organic wastewater flows into the oxidation zone (230) and reaches the highest liquid level line of the oxidation zone (230), and the water inlet is stopped; SA2, biochemical treatment The organic wastewater in the oxidation zone (230) is treated by timed pulse intermittent aeration according to the set aeration program; at the same time of the aeration treatment, the organic wastewater in the facultative anaerobic zone (210) is treated by timed stirring denitrification and phosphorus release, and the biological fluidized wall in the M process biochemical tank (200) is treated by timed backwashing flow; until the aeration program is executed, the sequence batch biochemical treatment of the organic wastewater is completed; the aeration program comprises timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux, timed aerobic aeration, quantitative reflux, timed anoxic aeration, quantitative reflux and timed aerobic aeration in time sequence; the mixed liquid reflux ratio of the quantitative reflux to the facultative anaerobic zone (210) is 1 / 3-1 / 2 of the volume of the oxidation zone (230); SA3, sedimentation, water drainage and sludge discharge After the biochemical treatment of step SA2 is completed, the sedimentation is carried out for 0.5-1 h to obtain upper liquid and lower sludge; the upper liquid is discharged and then disinfected by ultraviolet rays to obtain clean water; the lower sludge is discharged to the artificial wetland; The working time sequence process mode two comprises the following steps: SB1, water inlet The organic wastewater in the adjusting tank (100) is introduced into the facultative anaerobic zone (210) in the M process biochemical tank (200), and then the organic wastewater flows into the oxidation zone (230) and reaches the highest liquid level line of the oxidation zone (230), and the water inlet is stopped; SB2, biochemical treatment According to the set aeration program, the organic sewage in the oxidation zone (230) is treated by the timed pulse intermittent aeration; while the aeration treatment is being carried out, the organic sewage in the facultative anaerobic zone (210) is treated by the timed stirring denitrification and phosphorus release, and the biological fluidized wall in the M process biochemical tank (200) is treated by the timed backflow; until the aeration program is executed, the organic sewage is completed by the sequencing batch biochemical treatment; the aeration program includes the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration, the quantitative reflux, the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration, the quantitative reflux, the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration in time sequence; the reflux ratio of the mixed liquid to the facultative anaerobic zone (210) is 1 / 3-1 / 2 of the volume of the oxidation zone (230); SB3, precipitation, drainage, sludge discharge After the biochemical treatment of step SB2 is completed, the precipitation is carried out for 0.5-1 h to obtain the upper liquid and the lower sludge; after the upper liquid is discharged, the ultraviolet disinfection is carried out to obtain the clean water; the lower sludge is discharged to the artificial wetland; The self-circulation time sequence process mode one includes the following steps: SC1, feeding The carbon-nitrogen compound nutrient liquid is simultaneously introduced into the first facultative anaerobic zone (211) and the oxidation zone (230), and the introduction of the carbon-nitrogen compound nutrient liquid is stopped when the set value of the feeding flow meter is reached; SC2, biochemical treatment According to the set aeration program, the organic mixed liquid in the oxidation zone (230) is treated by the timed pulse intermittent aeration; while the aeration treatment is being carried out, the organic mixed liquid in the facultative anaerobic zone (210) is treated by the timed stirring denitrification and phosphorus release, and the biological fluidized wall in the M process biochemical tank (200) is treated by the timed backflow; until the aeration program is executed, the organic mixed liquid is completed by the self-circulation treatment; the aeration program includes the timed aerobic aeration, the quantitative reflux, the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration, the quantitative reflux, the timed anoxic aeration, the quantitative reflux, the timed aerobic aeration in time sequence; the reflux ratio of the mixed liquid to the facultative anaerobic zone (210) is 1 / 3-1 / 2 of the volume of the oxidation zone (230); SC3, precipitation, sludge discharge, reflux After the biochemical treatment of step SC2 is completed, the precipitation is carried out for 0.5-1 h to obtain the upper liquid and the lower sludge; the lower sludge is discharged to the artificial wetland, and the upper liquid is introduced into the first facultative anaerobic zone (211) by the quantitative reflux; During the self-circulation biochemical treatment, when the liquid level switch upper limit of the adjusting tank is reached, the self-circulation time sequence process mode one is stopped, and the working time sequence process mode one or the working time sequence process mode two is automatically entered; The self-circulation time sequence process mode two includes the following steps: SD1, feeding The carbon-nitrogen compound nutrient liquid is simultaneously introduced into the first facultative anaerobic zone (211) and the oxidation zone (230), and the introduction of the carbon-nitrogen compound nutrient liquid is stopped when the set value of the feeding flow meter is reached; SD2, biochemical treatment The carbon-nitrogen compound nutrient solution and the organic mixed solution formed by the organic wastewater in the M-process biochemical tank (200) are subjected to timed pulse intermittent aeration treatment of the organic mixed solution in the oxidation zone (230) according to a set aeration program; while the aeration treatment is being performed, the organic mixed solution in the facultative anaerobic zone (210) is subjected to timed stirring denitrification and phosphorus release treatment, and the biological fluidized wall in the M-process biochemical tank (200) is subjected to timed backflow treatment; until the aeration program is executed, the self-circulation treatment of the organic mixed solution is completed; the aeration program includes timed anoxic aeration, quantitative backflow, timed aerobic aeration, quantitative backflow, timed anoxic aeration, quantitative backflow, and timed aerobic aeration in time sequence; the backflow ratio of the mixed solution backflowing to the facultative anaerobic zone (210) is 1 / 3-1 / 2 of the volume of the oxidation zone (230); SD3, sedimentation, sludge discharge, backflow After the biochemical treatment in step SD2, the organic mixed solution is subjected to sedimentation for 0.5-1 h to obtain upper liquid and lower sludge; the lower sludge is discharged to the constructed wetland, and the upper liquid is subjected to quantitative backflow to the first facultative anaerobic zone (211). During the self-circulation biochemical treatment, when the organic wastewater in the adjusting tank reaches the upper limit of the liquid level switch, the self-circulation time sequence process mode two is stopped, and the working time sequence process mode one or the working time sequence process mode two is automatically entered. The biological fluidized wall has a concrete wall as the middle structure, stainless steel fence frames arranged on both sides from top to bottom, and biological fluidized balls arranged inside.

2. The completely biological organic sewage treatment process according to claim 1, characterized in that, The timed anoxic aeration has an anoxic aeration range of 0.1-1 mg / L of DO content, and a time of 1-2 h. The timed aerobic aeration has an aerobic aeration range of 1-5 mg / L of DO content, and a time of 1-2 h. The process has two aeration modes, namely, timed aerobic pulse intermittent aeration and timed anoxic pulse intermittent aeration. The timed aerobic pulse intermittent aeration is that when the DO content of the mixed solution in the oxidation zone (230) reaches the upper limit of the aerobic aeration range, the air inlet electromagnetic valve (720) is closed; when the DO content of the mixed solution in the oxidation zone (230) reaches the lower limit of the aerobic aeration range, the air inlet electromagnetic valve (720) is opened; the above steps are repeated for multiple times until the timing is completed, and the present aerobic aeration is completed. The timed anoxic pulse intermittent aeration is that when the DO content of the mixed solution in the oxidation zone (230) reaches the upper limit of the anoxic aeration range, the air inlet electromagnetic valve (720) is closed; when the DO content of the mixed solution in the oxidation zone (230) reaches the lower limit of the anoxic aeration range, the air inlet electromagnetic valve (720) is opened; the above steps are repeated for multiple times until the timing is completed, and the present anoxic aeration is completed.

3. An organic wastewater treatment system for implementing the complete biological type organic wastewater treatment process according to claim 1, characterized by, The organic wastewater treatment system comprises an M-process biochemical tank (200), and the M-process biochemical tank (200) is divided into three functional zones, namely, a facultative anaerobic zone (210), a biological selection zone (220), and an oxidation zone (230). The main function of the facultative anaerobic zone (210) is to carry out denitrification and phosphorus release process on the mixed liquid refluxed from the oxidation zone (230) and to provide backflow for the biological fluidized wall; the main function of the biological selection zone (220) is to avoid sludge bulking and to buffer microorganisms, and to provide backflow for the biological fluidized wall; the main function of the oxidation zone (230) is to carry out timed aerobic pulse intermittent aeration and timed anoxic pulse intermittent aeration to remove BOD5, and to provide backflow for the biological fluidized wall, sedimentation, drainage and sludge discharge functions; The organic wastewater treatment system further comprises an M-process PLC central control system (800), which comprises five modules, a data acquisition module, a working time control flow module one, a working time control flow module two, a self-circulation time control flow module one and a self-circulation time control flow module two; The facultative anaerobic zone (210) is provided with a facultative anaerobic zone sludge pump (213), a facultative anaerobic zone agitator (214) and a facultative anaerobic zone backflow pump (215); the biological selection zone (220) is provided with a biological selection zone backflow pump (221); the oxidation zone (230) is provided with a gas storage tank (700), an air inlet electromagnetic valve (720), an oxidation zone backflow pump (500), an oxidation zone drainage pump (231), an oxidation zone sludge pump (232) and an oxidation zone backflow pump (233); The facultative anaerobic zone (210) is provided with a first biological fluidized wall (240), which divides the facultative anaerobic zone (210) into a first facultative anaerobic zone (211) and a second facultative anaerobic zone (212); the two zones are connected through a notch on one side of the first biological fluidized wall (240); the second facultative anaerobic zone (212) is connected to the biological selection zone (220) through a communication hole on one side close to the biological selection zone (220); The biological selection zone (220) is provided with a second biological fluidized wall (250) on one side close to the oxidation zone (230), and the bottom of the second biological fluidized wall (250) is provided with a water outlet hole connected to the oxidation zone (230); The oxidation zone (230) is provided with a third biological fluidized wall (260) arranged along the longitudinal water flow direction, and the two ends are left with notches; The oxidation zone (230) is provided with an aeration pipeline at the bottom of the tank, which is arranged in a C-shaped or U-shaped layout around the third biological fluidized wall (260); The data acquisition module is responsible for collecting the liquid level switch signal of the conditioning tank (100) and the oxidation zone (230), the DO dissolved oxygen sensor (236) signal, the backflow flowmeter (600) signal, and the signals of the first feeding flowmeter (920) and the second feeding flowmeter (940), and feeding the collected signals to the M-process PLC central control system (800); The working time control flow module one and the working time control flow module two execute the working time sequence process mode one and the working time sequence process mode two programs and control the related equipment of each functional zone of the M-process biochemical tank (200); Self-circulation time-controlled flow module one and self-circulation time-controlled flow module two; execute self-circulation time sequence process mode one and self-circulation time sequence process mode two programs, and control the related equipment of each functional area of the M process biochemical pool (200) and the first feeding pump (910) and the second feeding pump (930).

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