Integrated Sewage Treatment and Reuse Equipment with Pretreatment Tank

Abstract

Integrated sewage treatment and reuse equipment with a pretreatment tank, which relates to the technical field of livestock and poultry breeding wastewater treatment; its structure includes a box body, inside which there are respectively a sewage treatment tank and an equipment room, and a deep treatment system is arranged in the equipment room. The liquid inlet pipe enters the box body and is communicated with the sewage treatment tank, the sewage treatment tank is connected to the deep treatment system through a pipeline, and the deep treatment system is communicated with the liquid outlet pipe. The sewage treatment tank includes a pretreatment tank and a first-stage anoxic tank, a first-stage aerobic tank, a second-stage anoxic tank and a second-stage aerobic tank that are connected in sequence, and the bottom of the pretreatment tank is a mud hopper structure. The present invention treats the anaerobic biogas slurry of the breeding farm through the combined process of two-stage A / O, MBBR and MBR, so that the effluent of the equipment meets the reclaimed water quality standard and realizes "zero discharge" of wastewater; and by adding a pretreatment tank and the corresponding reflux device and collection device, the treatment effect on the influent biogas slurry with different water qualities is good, the equipment has wide applicability and is easy to popularize and apply.

Description

Technical Field

[0001] The present invention relates to the technical field of livestock and poultry breeding wastewater treatment, and particularly relates to an integrated sewage treatment and reuse device with a pretreatment tank. Background Art

[0002] With the continuous increase in the demand for meat products and the rapid development of large-scale livestock and poultry breeding, the problem of livestock and poultry breeding pollution has become increasingly prominent.

[0003] The existing large-scale livestock and poultry farms usually adopt a process route of "solid-liquid separation - anaerobic treatment - aerobic treatment". However, the treatment effects are rather poor in many cases, the wastewater treatment facilities cannot operate normally, and a large amount of waste liquid is directly discharged without effective treatment, seriously polluting the ecological environment. Due to the irregular discharge of manure and sewage from livestock and poultry farms and the large fluctuations in influent water quality, most livestock and poultry farms, in order to save construction costs, usually use black film ground ponds or simple anaerobic tanks for existing biogas digesters, with poor treatment effects, large differences in the water quality of the effluent biogas slurry, and great impacts on subsequent treatment processes. Moreover, the water quality of anaerobic biogas slurry varies greatly among different livestock and poultry farms, resulting in the need for the subsequent treatment system to design targeted treatment processes according to the biogas slurry water quality, with a large amount of preliminary design work and difficulty in batch production, and it is difficult to promote and apply.

[0004] In addition, the existing treatment facilities usually adopt a civil engineering form. Once the farm needs to be relocated, the treatment facilities can only be abandoned or demolished, causing great waste of resources and economic losses to farmers. Summary of the Invention

[0005] The purpose of the present invention is to provide an integrated sewage treatment and reuse device with a pretreatment tank to avoid the deficiencies in the prior art, treat the anaerobic biogas slurry of the farm, and make the effluent of the device meet the reclaimed water quality standard.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] Provide an integrated sewage treatment and reuse device with a pretreatment tank, including a box body. Inside the box body, there are respectively a sewage treatment tank and an equipment room. A deep treatment system is provided in the equipment room. An influent pipe enters the box body and is connected to the sewage treatment tank. The sewage treatment tank is connected to the deep treatment system through a pipeline, and the deep treatment system is connected to an effluent pipe. The sewage treatment tank includes a pretreatment tank and a first-stage anoxic tank, a first-stage aerobic tank, a second-stage anoxic tank, and a second-stage aerobic tank that are connected in sequence. The sewage treatment tank is connected with a reflux device and a collection device. The bottom of the pretreatment tank is a mud hopper structure, and a perforated pipe for water distribution or sludge discharge is provided at the lower end of the pretreatment tank.

[0008] The reflux device includes a first reflux device, a second reflux device, a third reflux device, and a fourth reflux device. The first reflux device connects the first-stage aerobic tank and the first-stage anoxic tank. The second reflux device connects the second-stage aerobic tank and the second-stage anoxic tank. The third reflux device connects the second-stage aerobic tank and the pretreatment tank. The fourth reflux device includes a main pipeline and four branch pipelines. The output end of the main pipeline is respectively connected to the input ends of the four branch pipelines. The input end of the main pipeline is connected to the pretreatment tank. The output ends of the four branch pipelines are respectively connected to the first-stage anoxic tank, the first-stage aerobic tank, the second-stage anoxic tank, and the second-stage aerobic tank. An independent A control valve is provided on each branch pipeline.

[0009] The collection device includes a main collection pipe and four branch collection pipes. The input end of the main collection pipe is respectively connected to the output ends of the four branch collection pipes. The input ends of the four branch collection pipes are respectively connected to the bottoms of the first-stage anoxic tank, the first-stage aerobic tank, the second-stage anoxic tank, and the second-stage aerobic tank. An independent B control valve is provided on each branch collection pipe. The output end of the main collection pipe is connected to the pretreatment tank.

[0010] The influent pipe includes a main path, a first branch, a second branch, and a third branch. The first branch is connected to the influent distribution pipe and a first valve is provided on the first branch. The second branch is connected to the top of the pretreatment tank and a third valve is provided on the second branch. The third branch is connected to the top of the first-stage anoxic tank and a fourth valve is provided on the first branch.

[0011] An effluent weir is provided at the effluent end of the pretreatment tank. The pretreatment tank is connected to the first-stage anoxic tank through the effluent weir. A fifth valve is provided on the outlet pipe of the effluent weir. A second valve is provided at the bottom of the sludge discharge pipe extending out of the pretreatment tank.

[0012] Nitrifying bacteria are cultured in both the first-stage aerobic tank and the second-stage aerobic tank. Suspended fillers are added to the first-stage aerobic tank. At least one set of MBR membrane modules is placed in the second-stage aerobic tank. Aeration devices are provided inside both the first-stage aerobic tank and the second-stage aerobic tank.

[0013] An aeration device is provided at the bottom of the first-stage aerobic tank. Two sets of aeration devices are provided in the second-stage aerobic tank. One set of aeration device is located at the bottom of the MBR membrane module, and the other set of aeration device is located in other biochemical areas except the MBR membrane module. The aeration device is one of an aeration disc, an air diffuser pipe, and a perforated pipe.

[0014] Denitrifying bacteria are cultured in both the first-stage anoxic tank and the second-stage anoxic tank. Fixed fillers and an intermittent stirring device are placed in both the first-stage anoxic tank and the second-stage anoxic tank.

[0015] There are water passing holes provided between adjacent sewage treatment ponds, and a suspended packing interception device is arranged inside the water passing holes between the first-stage aerobic pond and the second-stage anoxic pond.

[0016] The equipment room includes a deep treatment system, a control electric cabinet and a blower. The deep treatment system is at least one of an ozone reaction system, a chemical dosing and precipitation system, and a filtration system. The input end of the deep treatment system is communicated with the output end of the sewage treatment pond.

[0017] The blower is connected to the aeration device through an air supply pipe, and the aeration device is located at the bottoms of the first-stage aerobic pond and the second-stage aerobic pond.

[0018] The sewage treatment pond further includes at least one group of additional ponds, which are located between the downstream of the first-stage aerobic pond and the upstream of the second-stage anoxic pond. The additional ponds include an additional anoxic pond and an additional aerobic pond that are communicated in sequence.

[0019] Advantages of the present invention: The present invention treats anaerobic biogas slurry in a livestock farm through a combined process of two-stage A / O, MBBR and MBR, so that the effluent of the equipment meets the reclaimed water quality standard, and is used for non-contact productive reuse in the livestock and poultry farm or as irrigation water for farmland / forest land, realizing "zero discharge" of wastewater; in addition, the integrated box structure makes the turnover of the present invention more flexible, with good environmental benefits. The box has the advantages of simple structure, good treatment effect, automatic control, high operation stability, high reuse rate, and saving secondary investment.

[0020] Furthermore, by adding a pretreatment pond and corresponding reflux devices and collection devices, the treatment effect on influent biogas slurry with different water qualities is better, the equipment has wide applicability, and is easy to promote and apply. Description of the Drawings

[0021] The present invention is further described with the aid of the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the following drawings without creative efforts.

[0022] Figure 1 It is a process flow schematic diagram of the integrated sewage treatment and reuse equipment with a pretreatment pond of the present invention.

[0023] Figure 2 It is a plane layout schematic diagram of the integrated sewage treatment and reuse equipment with a pretreatment pond of the present invention.

[0024] Figure 3 It is a process flow schematic diagram of Embodiment 1 and Embodiment 2 of the integrated sewage treatment and reuse equipment with a pretreatment pond of the present invention.

[0025] Figure 4 This is a schematic process flow diagram of Embodiment 3 of the integrated sewage treatment and reuse equipment with a pretreatment tank according to the present invention.

[0026] Figure 5 This is a schematic process flow diagram of Embodiment 4 of the integrated sewage treatment and reuse equipment with a pretreatment tank according to the present invention.

[0027] Figure 6 This is a schematic process flow diagram of Embodiment 5 of the integrated sewage treatment and reuse equipment with a pretreatment tank according to the present invention.

[0028] The figure includes:

[0029] 0. Box body; 01. Jet mixer;

[0030] 02. Fixed packing; 1. Pretreatment tank;

[0031] 11. Perforated pipe; 110. Second valve;

[0032] 12. Hopper structure; 13. Effluent weir;

[0033] 135. Fifth valve; 2. First-stage anoxic tank;

[0034] 3. First-stage aerobic tank; 31. Suspended packing;

[0035] 32. Aeration disc; 4. Second-stage anoxic tank;

[0036] 5. Second-stage aerobic tank; 51. MBR membrane module;

[0037] 52. Perforated pipe; 6. Equipment room;

[0038] 61. Advanced treatment system; 62. Blower;

[0039] 63. Control electrical cabinet; 7. Return device;

[0040] 71. First return device; 72. Second return device;

[0041] 73. Third return device; 74. Fourth return device;

[0042] 8. Feed pipe; 81. First valve;

[0043] 83. Third valve; 84. Fourth valve; 9. Collection device. Detailed implementation manners

[0044] The present invention will be further described in conjunction with the following embodiments.

[0045] The integrated sewage treatment and reuse equipment with a pretreatment tank in this embodiment refers toFigures 1 to 2 , including a box body 0. Inside the box body 0, there are a sewage treatment pool and an equipment room 6 respectively. The sewage treatment pool includes a pretreatment pool 1, a first-stage anoxic pool 2, a first-stage aerobic pool 3, a second-stage anoxic pool 4 and a second-stage aerobic pool 5. Inside the equipment room 6, there is a deep treatment system 61. An inlet pipe 8 enters the box body 0 and is connected to the pretreatment pool 1. The pretreatment pool 1 is sequentially connected to the first-stage anoxic pool 2, the first-stage aerobic pool 3, the second-stage anoxic pool 4 and the second-stage aerobic pool 5. The second-stage aerobic pool 5 is connected to the deep treatment system 61 through a pipeline. The deep treatment system 61 is connected to an outlet pipe. The sewage treatment pool is connected with a reflux device 7 and a collection device 9. The bottom of the pretreatment pool 1 is a mud hopper structure 12. At the lower end of the pretreatment pool 1, there is a perforated pipe 11 for water distribution or sludge discharge. The perforated pipe 11 is respectively provided with a water distribution valve and a sludge discharge valve. When the water distribution valve is closed and the sludge discharge valve is opened, the perforated pipe 11 is used for sludge discharge. On the contrary, it is used for water distribution. The pipe of the perforated pipe 11 located at the bottom of the pool is of a perforated structure, which is convenient for uniform water distribution and sludge discharge.

[0046] The reflux device 7 includes a first reflux device 71, a second reflux device 72, a third reflux device 73 and a fourth reflux device 74, where:

[0047] The first-stage aerobic pool 3 is connected to the first-stage anoxic pool 2 through the first reflux device 71 to reflux the nitrified liquid in the first-stage aerobic pool 3 to the first-stage anoxic pool 2; the denitrifying bacteria in the first-stage anoxic pool 2 make full use of the organic matter in the water and carry out a denitrification reaction with the nitrified liquid refluxed from the first-stage aerobic pool 3 to remove nitrate nitrogen;

[0048] The second-stage aerobic pool 5 is connected to the second-stage anoxic pool 4 through the second reflux device 72 to reflux the nitrified liquid in the second-stage aerobic pool 5 to the second-stage anoxic pool 4. The denitrifying bacteria in the second-stage anoxic pool 4 carry out endogenous respiration or make use of the organic matter in the water to carry out a denitrification reaction with the nitrified liquid refluxed from the second-stage aerobic pool 5 and the nitrified liquid flowing into the second-stage aerobic pool 5 from the first-stage aerobic pool 3, further removing nitrate nitrogen and improving the nitrogen removal efficiency of the system;

[0049] The second-stage aerobic pool 5 is also connected to the first-stage anoxic pool 2 through the third reflux device 73 to reflux the sludge and nitrified liquid in the second-stage aerobic pool 5 to the first-stage anoxic pool 2; on the one hand, the sewage containing nitrate nitrogen refluxed from the second-stage aerobic pool 5 undergoes denitrification and nitrogen removal by the denitrifying bacteria in the first-stage anoxic pool 2 to further remove nitrate nitrogen, and on the other hand, the sludge refluxed from the second-stage aerobic pool 5 is used to supplement the microbial biomass of the system.

[0050] The reflux device 7 adopts air-lift reflux, and the air provided by the blower 62 can be used as the lifting power to make the sludge reflux; thus, equipment such as reflux pumps can be not set, reducing the costs of equipment purchase and maintenance, and at the same time being able to reduce the power consumption of the entire sewage treatment equipment; the reflux device is respectively controlled by valves, and the reflux amount and reflux time can be controlled.

[0051] The collection device 9 includes a main collection pipe and four branch collection pipes. The input end of the main collection pipe is respectively communicated with the output ends of the four branch collection pipes. The input ends of the four branch collection pipes are respectively communicated with the bottoms of the first-stage anoxic tank 2, the first-stage aerobic tank 3, the second-stage anoxic tank 4 and the second-stage aerobic tank 5. An independent B control valve is provided on each branch collection pipe, and the output end of the main collection pipe is communicated with the pretreatment tank 1.

[0052] The liquid inlet pipe 8 includes a first branch, a second branch and a third branch. The first branch is communicated with the water inlet distribution pipe and a first valve 81 is provided on the first branch. The second branch is communicated with the top of the pretreatment tank 1 and a third valve 83 is provided on the second branch. The third branch is communicated with the top of the first-stage anoxic tank 2 and a fourth valve 84 is provided on the first branch.

[0053] An effluent weir 13 is arranged at the effluent end of the pretreatment tank 1. The pretreatment tank 1 is communicated with the first-stage anoxic tank 2 through the effluent weir 13. A fifth valve 135 is provided on the outlet pipe of the effluent weir 13. A second valve 110 is provided at the bottom of the sludge discharge pipe extending out of the pretreatment tank 1.

[0054] Nitrifying bacteria are cultured in both the first-stage aerobic tank 3 and the second-stage aerobic tank 5. Suspended packing 31 is added to the first-stage aerobic tank 3. The addition of the suspended packing 31, on the one hand, can increase the biomass and biological species per unit volume in the first-stage aerobic tank 3, which is beneficial to the growth and reproduction of nitrifying bacteria with a long sludge age and improves the nitrification reaction efficiency; on the other hand, in the first-stage aerobic tank 3, there is not only activated sludge growing suspended in water, but also a biological film growing attached to the suspended packing 31. When the influent water volume and quality of the integrated sewage treatment and reuse equipment fluctuate greatly, the biological film has strong acceptance and good shock resistance, making the biochemical system operate stably.

[0055] Two groups of MBR membrane modules 51 are placed in the second-stage aerobic tank 5. The two groups of MBR membrane modules 51 are in parallel for water outlet. Through the efficient interception of the membrane, all bacteria and suspended solids are intercepted in the MBR membrane tank, making the effluent water quality better. In addition, the membrane can effectively intercept nitrifying bacteria, enabling the nitrification reaction to proceed smoothly and effectively removing ammonia nitrogen. At the same time, it can intercept the refractory macromolecular organic matter in the aquaculture wastewater, extend its residence time in the reactor, and make it degraded to the maximum extent. In addition, by regularly discharging the excess sludge in the MBR membrane tank, the concentration of activated sludge and sludge age in the system can be effectively controlled.

[0056] Both the first-stage aerobic tank 3 and the second-stage aerobic tank 5 are equipped with aeration devices. The aeration devices can be aeration discs, aeration pipes or perforated pipes. Preferably, the aeration device in this embodiment includes an aeration disc 32 and a perforated pipe 52. The aeration disc 32 is located in the remaining areas of the first-stage aerobic tank 3 and the second-stage aerobic tank 5 except for the MBR membrane modules. The perforated pipe 52 is located below the MBR membrane modules in the second-stage aerobic tank 5. Among them, the oxygen utilization rate of the aeration disc 32 is high; the perforated pipe 52 is mainly used to scour the membrane modules with large air bubbles to prevent membrane blockage.

[0057] Denitrifying bacteria are cultured in both the first-stage anoxic tank 2 and the second-stage anoxic tank 4. Fixed fillers 02 and intermittent stirring devices are placed in both the first-stage anoxic tank 2 and the second-stage anoxic tank 4.

[0058] Water passing holes are provided between adjacent sewage treatment tanks. A suspended filler 31 interception device is arranged inside the water passing hole between the first-stage aerobic tank 3 and the second-stage anoxic tank 4 to prevent the suspended filler from flowing into the second-stage anoxic tank 4 from the first-stage aerobic tank 3 with the water flow, causing filler loss.

[0059] The equipment room 6 includes a deep treatment system 61, a control electric cabinet 63 and a blower 62. The deep treatment system 61 can be at least one of an ozone reaction system, a dosing precipitation system, and a filtration system. The input end of the deep treatment system 61 is connected to the output end of the sewage treatment tank. Preferably, in this embodiment, the deep treatment system 61 is an ozone reaction system. After the MBR effluent is treated with ozone, the effects of further reducing organic pollutants, decolorization and disinfection can be achieved. The ozone reaction system includes an ozone generator, a gas source device, an ozone reaction tank, a gas-liquid mixing device, etc. The gas source device is an air compressor or an oxygen generator. The gas-liquid mixing device is a jet mixer, a titanium alloy aeration disc or a dissolved air pump. Preferably, the gas source comes from the oxygen source provided by the oxygen generator. Compared with the air source provided by the air compressor, the ozone concentration can be increased by 3-5 times. The gas-liquid mixing device is a gas-liquid mixing pump. Due to the pressurized mixing of the gas-liquid mixing pump, ozone and wastewater are fully dissolved and mixed, and the dissolution efficiency can be effectively improved compared with other gas-liquid mixing devices.

[0060] The blower 62 is connected to the aeration device through an air supply pipe, and the aeration device is located at the bottoms of the first-stage aerobic tank 3 and the second-stage aerobic tank 5.

[0061] The sewage treatment tank further includes at least one group of additional tanks, which are located between the downstream of the first-stage aerobic tank 3 and the upstream of the second-stage anoxic tank 4. The additional tanks include an additional anoxic tank and an additional aerobic tank that are connected in sequence. Through multi-stage nitrification-denitrification reactions, the total nitrogen removal efficiency of the equipment is further improved.

[0062] According to the different water qualities of the influent biogas slurry of the integrated sewage treatment and reuse equipment and the requirements of the equipment effluent, the pretreatment tank 1 can be one of a hydrolysis acidification tank, an anoxic tank, a sedimentation tank, and a sludge tank. Therefore, the integrated sewage treatment and reuse equipment can handle biogas slurry with different influent water qualities, has a wider applicability, a higher market acceptance, and can be mass-produced, reducing the process design and production costs. The bottom of the pretreatment tank 1 is a mud hopper structure 12, which is conducive to the collection and discharge of the remaining sludge in the tank.

[0063] Example 1.

[0064] The integrated sewage treatment and reuse equipment with a pretreatment tank 1 in this example refers to Figure 3 , the pretreatment tank 1 is a hydrolysis acidification tank. The reflux material of the third reflux device 73 is mainly sludge. When the organic matter concentration in the influent biogas slurry is very high, the hydrolysis acidification tank can further reduce the influent organic matter concentration, thereby reducing the impact on the subsequent treatment units. Among them, the third valve 83 (the influent valve at the upper part of the pretreatment tank 1) and the fourth valve 84 (the influent valve of the first-stage anoxic tank 2) are in a normally closed state. When the integrated equipment is inlets water, open the first valve 81 (the influent water distribution pipe valve at the bottom of the pretreatment tank 1), close the second valve 110 (the sludge discharge valve of the pretreatment tank 1), and the wastewater is evenly distributed through the perforated pipe 11 at the bottom of the pretreatment tank 1, and a hydraulic stirring effect is achieved, so that the influent water is fully mixed and contacted with the sludge, and sludge deposition is prevented. When the pretreatment tank 1 needs to discharge sludge, close the first valve 81 (the influent water distribution pipe valve at the bottom of the pretreatment tank 1), stop the influent water, and after standing and settling for a certain time, open the second valve 110 (the sludge discharge valve of the pretreatment tank 1) to perform gravity sludge discharge. The discharged sludge flows back to the anaerobic tank or biogas digester at the front end of the integrated sewage treatment and reuse equipment to supplement the sludge in the anaerobic tank or biogas digester, improve the anaerobic treatment efficiency, thereby reducing the influent organic load of the integrated sewage treatment and reuse equipment and improving the effluent effect.

[0065] Example 2.

[0066] The integrated sewage treatment and reuse equipment with a pretreatment tank 1 in this example refers to Figure 3, the pretreatment tank 1 is an anoxic tank. The reflux of the third reflux device 73 is mainly nitrified liquid. When the effluent standard has a high requirement for the total nitrogen index or the influent total nitrogen content is very high, denitrifying bacteria in the anoxic tank utilize the organic carbon source in the influent and the nitrified liquid refluxed from the MBR membrane tank to carry out denitrification and nitrogen removal reaction, thereby improving the overall nitrogen removal capacity of the integrated equipment. The influent of the integrated equipment only enters from the bottom of the pretreatment tank 1, that is, the third valve 83 (the upper influent valve of the pretreatment tank 1) and the fourth valve 84 (the influent valve of the first-stage anoxic tank 2) are in a normally closed state. When the integrated equipment is in operation, the first valve 81 (the bottom influent distributing pipe valve of the pretreatment tank 1) is opened, and the second valve 110 (the sludge discharge valve of the pretreatment tank 1) is closed. The wastewater is evenly distributed through the perforated pipe 11 at the bottom of the pretreatment tank 1 and plays a hydraulic agitation role to prevent sludge deposition. When the pretreatment tank 1 needs to discharge sludge, the first valve 81 (the bottom influent distributing pipe valve of the pretreatment tank 1) is closed to stop the influent. After standing and sedimentation for a certain time, the second valve 110 (the sludge discharge valve of the pretreatment tank 1) is opened for gravity sludge discharge, and the surplus sludge is discharged into the sludge thickening tank outside the equipment.

[0067] Example 3.

[0068] The integrated sewage treatment and reuse equipment with a pretreatment tank 1 in this embodiment is referred to Figure 4 , the pretreatment tank 1 is a sedimentation tank. When there are a large amount of biogas residues in the influent biogas slurry, the sedimentation tank can effectively precipitate and discharge the biogas residues in the influent, thereby reducing the impact on the subsequent treatment units. The influent of the integrated equipment only enters from the upper part of the pretreatment tank 1, that is, the first valve 81 (the influent distributing pipe valve of the pretreatment tank 1) and the fourth valve 84 (the influent valve of the first-stage anoxic tank 2) are normally closed, and the perforated pipe 11 at the bottom of the pretreatment tank 1 is only used as a sludge discharge pipe. When the equipment is in operation, the third valve 83 (the upper influent valve of the pretreatment tank 1) is opened, and the biogas slurry enters the tank from the influent pipe at the upper part of the pretreatment tank 1 and undergoes sedimentation separation in the tank. When discharging sludge, the second valve 110 (the sludge discharge valve of the pretreatment tank 1) is opened to discharge the surplus sludge into the sludge tank outside the integrated equipment. Preferably, the coagulant can be added to the influent by adding a jet mixer 01 to the influent branch pipe, so that the medicament reacts fully with the influent, thereby achieving a better sedimentation effect.

[0069] Example 4.

[0070] The integrated sewage treatment and reuse equipment with a pretreatment tank 1 in this embodiment is referred to Figure 5, the pretreatment tank 1 is a sludge collection tank. When the organic matter content and nutrients in the influent biogas slurry are low and in the early stage of commissioning of the integrated sewage treatment and reuse equipment, the sludge collection tank is used to collect and return the activated sludge in the biochemical treatment tank, prevent the loss of activated sludge in the early stage of commissioning, shorten the period of culturing bacteria during commissioning, and thus shorten the equipment startup time. The influent of the integrated equipment only enters from the upper part of the first-stage anoxic tank 2, that is, the first valve 81 (valve of the influent distribution pipe of the pretreatment tank 1), the third valve 83 (upper influent valve of the pretreatment tank 1), and the fifth valve 135 (effluent pipe valve of the effluent weir 13 of the pretreatment tank 1) are normally closed, and the perforated pipe 11 at the bottom of the pretreatment tank 1 is only used as a sludge discharge pipe. When the equipment is in water inlet, the fourth valve 84 (upper influent valve of the first-stage anoxic tank 2) is opened, and the biogas slurry directly enters the first-stage anoxic tank 2 without being treated by the pretreatment tank 1, so as to shorten the hydraulic retention time of the biogas slurry in the integrated equipment, which is beneficial to culturing bacteria and improving the treatment effect. The first-stage anoxic tank 2, the first-stage aerobic tank 3, the second-stage anoxic tank 4, and the second-stage aerobic tank 5 respectively discharge the activated sludge into the pretreatment tank 1 through the collection device 9. The activated sludge enriched in the pretreatment tank 1 can be refluxed to the other sewage treatment tanks respectively through the fourth reflux device 74 and controlled by different pipelines and valves. Thus, during commissioning, according to the different culturing conditions of each sewage treatment tank, the sludge can be refluxed as needed to accelerate the culturing time. When the water level of the supernatant in the pretreatment tank 1 is high, the fifth valve 135 (effluent pipe valve of the effluent weir 13 of the pretreatment tank 1) can be opened to make the supernatant flow by gravity to the first-stage anoxic tank 2 for treatment.

[0071] Example 5.

[0072] The integrated sewage treatment and reuse equipment with a pretreatment tank 1 in this embodiment refers to Figure 5 , fixed packing 02 is placed in the first-stage anoxic tank 2 and the second-stage anoxic tank 4. On the one hand, it can increase the biomass and biological species per unit volume in the anoxic tank and improve the denitrification reaction efficiency; on the other hand, compared with the activated sludge, the biofilm attached and growing on the fixed packing 02 has strong acceptance and good shock resistance when the influent water volume and quality of the integrated sewage treatment and reuse equipment fluctuate greatly, making the biochemical system operate stably.

[0073] The above embodiments treat the anaerobic biogas slurry of the farm through the combined process of two-stage A / O, MBBR and MBR, making the equipment effluent meet the reclaimed water quality standard, for non-contact productive reuse in the livestock and poultry farm or as irrigation water for farmland / forest land, realizing "zero discharge" of wastewater; in addition, the integrated box structure makes the turnover of the present invention more flexible, with good environmental benefits, simple box 0 structure, good treatment effect, automatic control, high operation stability, high reuse rate, saving secondary investment and other advantages.

[0074] Furthermore, by adding the pretreatment tank 1 and the corresponding reflux device and collection device 9, the treatment effect on the incoming biogas slurry with different water qualities is good, the equipment has wide applicability, and it is easy to popularize and apply.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An integrated sewage treatment method with a pretreatment tank, characterized in that, Apply an integrated sewage treatment and reuse device with a pretreatment tank. The integrated sewage treatment and reuse device with a pretreatment tank includes a box body. Inside the box body, there are a sewage treatment tank and an equipment room respectively. A deep treatment system is arranged in the equipment room. The influent pipe enters the box body and is connected to the sewage treatment tank. The sewage treatment tank is connected to the deep treatment system through a pipeline, and the deep treatment system is connected to the effluent pipe. The sewage treatment tank includes a pretreatment tank and a first-stage anoxic tank, a first-stage aerobic tank, a second-stage anoxic tank, and a second-stage aerobic tank that are connected in sequence. The sewage treatment tank is connected with a reflux device and a collection device. The bottom of the pretreatment tank is a mud hopper structure, and a perforated pipe for water distribution or sludge discharge is arranged at the lower end of the pretreatment tank; The influent pipe includes a main road, a first branch, a second branch, and a third branch. The first branch is connected to the perforated pipe and a first valve is arranged on the first branch. The perforated pipe extends out of the bottom of the pretreatment tank and a second valve is arranged. The second branch is connected to the top of the pretreatment tank and a third valve is arranged on the second branch. The third branch is connected to the top of the first-stage anoxic tank and a fourth valve is arranged on the first branch; The reflux device includes a first reflux device, a second reflux device, a third reflux device, and a fourth reflux device. The first reflux device connects the first-stage aerobic tank and the first-stage anoxic tank. The second reflux device connects the second-stage aerobic tank and the second-stage anoxic tank. The third reflux device connects the second-stage aerobic tank and the pretreatment tank. The fourth reflux device includes a main pipeline and four branch pipelines. The output end of the main pipeline is respectively connected to the input ends of the four branch pipelines. The input end of the main pipeline is connected to the pretreatment tank. The output ends of the four branch pipelines are respectively connected to the first-stage anoxic tank, the first-stage aerobic tank, the second-stage anoxic tank, and the second-stage aerobic tank. An independent A control valve is arranged on each branch pipeline; An effluent weir is arranged at the effluent end of the pretreatment tank. The pretreatment tank is connected to the first-stage anoxic tank through the effluent weir, and a fifth valve is arranged on the effluent pipe of the effluent weir; According to the different water quality of the influent biogas slurry and the equipment effluent requirements of the integrated sewage treatment and reuse device, the pretreatment tank is selected from one of a hydrolysis acidification tank, an anoxic tank, a sedimentation tank, and a sludge tank. The integrated sewage treatment and reuse device can handle biogas slurry with different influent water qualities; When the pretreatment tank is a hydrolysis acidification tank, the reflux of the third reflux device is mainly sludge. The third valve and the fourth valve are in a normally closed state. When the integrated sewage treatment and reuse device is inlets water, open the first valve and close the second valve. When the pretreatment tank needs to discharge sludge, close the first valve and stop inletting water. After standing and sedimenting for a certain time, open the second valve to carry out gravity sludge discharge. The discharged sludge flows back to the anaerobic tank or biogas digester at the front end of the integrated sewage treatment and reuse device; When the pretreatment tank is an anoxic tank, the reflux of the third reflux device is mainly nitrified liquid. The influent of the integrated sewage treatment and reuse equipment only enters from the bottom of the pretreatment tank, that is, the third valve and the fourth valve are in a normally closed state. When the integrated sewage treatment and reuse equipment is in operation, the first valve is opened and the second valve is closed. The wastewater is evenly distributed through the perforated pipes at the bottom of the pretreatment tank, which also plays a role in hydraulic agitation to prevent sludge deposition. When sludge discharge is required in the pretreatment tank, the first valve is closed to stop the influent. After standing and sedimentation for a certain period of time, the second valve is opened for gravity sludge discharge, and the excess sludge is discharged to the sludge thickening tank outside the equipment. When the pretreatment tank is a sedimentation tank, the influent of the integrated sewage treatment and reuse equipment only enters from the upper part of the pretreatment tank, that is, the first valve and the fourth valve are in a normally closed state. The perforated pipes at the bottom of the pretreatment tank are only used as sludge discharge pipes. When the equipment is in operation, the third valve is opened, and the biogas slurry enters the tank from the inlet pipe at the upper part of the pretreatment tank and undergoes sedimentation separation in the tank. When discharging sludge, the second valve is opened to discharge the excess sludge to the sludge tank outside the integrated sewage treatment and reuse equipment. When the pretreatment tank is a sludge collection tank, the influent of the integrated sewage treatment and reuse equipment only enters from the upper part of the first-stage anoxic tank, that is, the first valve, the third valve, and the fifth valve are in a normally closed state. The perforated pipes at the bottom of the pretreatment tank are only used as sludge discharge pipes. When the equipment is in operation, the fourth valve is opened, and the biogas slurry directly enters the first-stage anoxic tank for treatment without passing through the pretreatment tank. The first-stage anoxic tank, the first-stage aerobic tank, the second-stage anoxic tank, and the second-stage aerobic tank respectively discharge the activated sludge to the pretreatment tank through the collection device. The activated sludge enriched in the pretreatment tank is respectively refluxed to the other treatment tanks through the fourth reflux device and controlled by different pipelines and valves. Thus, during the commissioning period, according to the different bacteria cultivation conditions of each treatment tank, the sludge is refluxed as needed to accelerate the bacteria cultivation time. When the water level of the supernatant in the pretreatment tank is relatively high, the fifth valve is opened to allow the supernatant to flow by gravity to the first-stage anoxic tank for treatment.

2. The integrated sewage treatment method with a pretreatment tank according to claim 1, characterized in that: The collection device includes a main collection pipe and four branch collection pipes. The input end of the main collection pipe is respectively connected to the output ends of the four branch collection pipes. The input ends of the four branch collection pipes are respectively connected to the bottoms of the first-stage anoxic tank, the first-stage aerobic tank, the second-stage anoxic tank, and the second-stage aerobic tank. An independent B control valve is provided on each branch collection pipe, and the output end of the main collection pipe is connected to the pretreatment tank.

3. The integrated sewage treatment method with a pretreatment tank according to claim 1, characterized in that: Nitrifying bacteria are cultivated in both the first-stage aerobic tank and the second-stage aerobic tank. Suspended fillers are added to the first-stage aerobic tank, and at least one set of MBR membrane modules is placed in the second-stage aerobic tank. Aeration devices are provided inside both the first-stage aerobic tank and the second-stage aerobic tank.

4. The integrated sewage treatment method with a pretreatment tank according to claim 1, characterized in that: An aeration device is provided at the bottom of the first-stage aerobic tank. There are two sets of aeration devices in the second-stage aerobic tank. One set of aeration devices is located at the bottom of the MBR membrane module, and the other set of aeration devices is located in other biochemical areas except the MBR membrane module. The aeration device is one of an aeration disc, an air distribution pipe, and a perforated pipe.

5. The integrated sewage treatment method with a pretreatment tank according to claim 1, characterized in that: Denitrifying bacteria are cultured in both the first-stage anoxic tank and the second-stage anoxic tank. Fixed fillers and stirring devices for intermittent stirring are placed in both the first-stage anoxic tank and the second-stage anoxic tank. Water passing holes are provided between each treatment tank, and a suspended filler interception device is arranged inside the water passing hole between the first-stage aerobic tank and the second-stage anoxic tank.

6. The integrated sewage treatment method with a pretreatment tank according to claim 4, characterized in that: The equipment room includes a deep treatment system, a control electric cabinet, and a blower. The deep treatment system is at least one of an ozone reaction system, a chemical addition and precipitation system, and a filtration system. The input end of the deep treatment system is connected to the output end of the sewage treatment tank. The blower is connected to the aeration device through an air supply pipe, and the aeration device is located at the bottoms of the first-stage aerobic tank and the second-stage aerobic tank.

7. The integrated sewage treatment method with a pretreatment tank according to claim 6, characterized in that: The sewage treatment tank further includes at least one group of additional tanks, which are located between the downstream of the first-stage aerobic tank and the upstream of the second-stage anoxic tank. The additional tank includes an additional anoxic tank and an additional aerobic tank that are connected in sequence.

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