Integrated rural sewage treatment system capable of automatically switching multiple operation modes

Abstract

The invention discloses an integrated sewage treatment system capable of automatically switching operation modes, which is characterized in that a liquid level meter is arranged in an adjusting tank, and a water outlet of the adjusting tank is connected with a plurality of integrated sewage treatment devices in parallel through a lifting pump and a main water inlet pipe; the plurality of integrated sewage treatment devices are connected to the deep treatment unit; the carbon source dosing pump is connected with a carbon source dosing pipe; the aeration unit is connected with an aeration pipeline; the PLC control system can predict the water quantity according to the liquid level value of the liquid level meter, automatically control the starting and stopping time of the lifting pump and the carbon source dosing pump and switch of each water inlet valve to select the operation number of the integrated sewage treatment equipment according to the water quantity in combination with the treatment capacity of the single equipment, and predict the water quality concentration of inlet water according to the liquid level value measured by the liquid level meter; and according to the predicted inflow water quality concentration, automatically controlling the integrated sewage treatment equipment which runs at present to run according to the corresponding treatment mode. The system can automatically adjust the number and the operation mode of sewage treatment equipment according to the water quantity and the water quality, and ensures that the effluent stably reaches the standard for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of rural sewage treatment, and particularly relates to an integrated rural sewage treatment system with automatic switching of multiple operation modes. Background Art

[0002] With the gradual improvement of the country's ecological civilization requirements and ecological environment requirements, rural sewage treatment has become a key area of concern for improving the rural human settlement environment, and its treatment equipment has entered a stage of rapid development, with various rural sewage treatment equipment emerging in an endless stream. China has a vast territory, and the living habits and residential characteristics of rural areas in different regions are also different. Combining the precipitation changes during the non-rainy season and the rainy season, the sewage volume and water quality fluctuate greatly. In addition, the existing rural sewage treatment facilities are relatively scattered, and due to the shortage of operation and maintenance funds, the number of professional operation and maintenance personnel is generally insufficient. Rural sewage generally adopts the operation and maintenance mode of "regular inspection and unattended". Based on this background, in order to improve the actual treatment effect of rural sewage, the treatment facilities are required to have the characteristics of high automation, flexible process adjustment, and stable equipment operation. At present, most rural sewage treatment facilities simply follow the configuration idea of urban sewage treatment, that is, the process operation mode and the logic of the automatic control system are relatively simple, and are equipped with on-line instruments for inlet and outlet water, flow meters and other process instruments. In the case of manned operation, operators can conduct data analysis based on the feedforward and feedback data of the instruments, and then adjust the process parameters in real time according to the changes in water quality and water volume data to ensure stable effluent discharge up to the standard. However, the rural sewage treatment process usually adopts an unattended operation mode, and does not set on-line instruments for inlet and outlet water and related process instruments, so it is impossible to automatically switch the operation process and adjust the process parameters according to the influent water volume and water quality in a timely manner, which will affect the activity of microorganisms in the biological system, resulting in unstable process operation and unable to ensure stable effluent discharge up to the standard.

[0003] In view of this, the present invention is specifically proposed. Summary of the Invention

[0004] The object of the present invention is to provide an integrated rural sewage treatment system with automatic switching of multiple operation modes, which can automatically select the number of operating integrated sewage treatment equipment and predict the water quality according to the influent water volume under the unattended operation state, automatically select a suitable process route according to the predicted water quality, and simultaneously automatically match the best operating conditions of the process route, reduce the dependence on process personnel, thereby maintaining the activity of microorganisms in the biochemical system, improving the stability and efficiency of process operation, realizing stable effluent discharge up to the standard and energy efficiency matching, and well solving the problems existing in the prior art.

[0005] The object of the present invention is achieved by the following technical solutions:

[0006] An integrated rural sewage treatment system with automatic switching of multiple operating modes, comprising:

[0007] A regulating tank, a lift pump, a liquid level gauge, multiple integrated sewage treatment devices, a total inlet pipe, a total outlet pipe, a PLC control system, multiple carbon source dosing pumps, multiple PAC dosing pumps, and an aeration unit;

[0008] The liquid level gauge is arranged in the regulating tank. The outlet of the regulating tank is connected to the total inlet pipe. The lift pump is arranged on the total inlet pipe. The outlet end of the total inlet pipe is connected in parallel with multiple inlet branch pipes. An inlet valve is arranged on each inlet branch pipe. Each inlet branch pipe is connected to an integrated sewage treatment device. Multiple integrated sewage treatment devices are connected in parallel;

[0009] The outlet end of each integrated sewage treatment device is connected to an outlet branch pipe. Each outlet branch pipe is connected to the total outlet pipe and is connected to the advanced treatment unit through the total outlet pipe;

[0010] Each carbon source dosing pump is connected to the carbon source dosing pipe of an integrated sewage treatment device;

[0011] Each PAC dosing pump is connected to the PAC dosing pipe of an integrated sewage treatment device;

[0012] The aeration unit is respectively connected to the aeration pipelines of each integrated sewage treatment device;

[0013] The PLC control system is respectively electrically connected to the liquid level gauge, the lift pump, each carbon source dosing pump, and each inlet valve. It can predict the water volume of the regulating tank according to the liquid level value of the regulating tank measured by the liquid level gauge, and select the number of operating integrated sewage treatment devices by automatically controlling the start and stop times of the lift pump and the corresponding carbon source dosing pump, the opening and closing of the corresponding PAC dosing pump and each electric valve in combination with the daily treatment capacity of a single integrated sewage treatment device. And it can predict the inlet water quality concentration according to the liquid level value of the regulating tank measured by the liquid level gauge, and automatically control the currently operating integrated sewage treatment device to operate in the corresponding treatment mode, so that the integrated sewage treatment device treats sewage according to the corresponding treatment process.

[0014] Compared with the prior art, the integrated rural sewage treatment system with automatic switching of multiple operating modes provided by the present invention has the following beneficial effects:

[0015] By paralleling multiple integrated sewage treatment devices and using a PLC control system to predict the water volume and quality in the regulating tank based on the measured liquid level in the regulating tank, and then automatically selecting the number of operating integrated sewage treatment devices according to the change in water volume, the matching of the number of operating integrated sewage treatment devices and the water volume is achieved, avoiding the water quality risk caused by "a small horse pulling a big cart" and the waste of power consumption and chemical consumption caused by "a big horse pulling a small cart", and automatically switching the operating process and adjusting the process parameters according to the predicted water quality concentration, well matching the water quality fluctuations of high, medium and low concentrations, realizing the automatic adaptation of different influent concentrations and process parameters. Such a system can, under the condition of unattended operation, automatically switch the operating process according to the changes in the water volume and quality of the regulating tank, timely adjust the process operating parameters and automatically select the number of integrated sewage treatment devices, reducing the impact of water volume and quality fluctuations on the biochemical system, improving the stability of the biochemical system, and being able to reduce the power consumption and chemical consumption under the condition of insufficient water volume on the premise of ensuring stable effluent compliance, achieving cost reduction and efficiency increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 FIG. is a schematic diagram of the overall structure of an integrated rural sewage treatment system with automatic switching of multiple operating modes provided by an embodiment of the present invention.

[0018] Figure 2 FIG. is a schematic diagram of the structure of an integrated sewage treatment device of an integrated rural sewage treatment system with automatic switching of multiple operating modes provided by an embodiment of the present invention.

[0019] The labels in the figure are as follows: 1 - regulating tank; 2 - lift pump; 3 - liquid level gauge; 4 - integrated sewage treatment equipment; 41 - anaerobic tank; 42 - anoxic tank; 43 - aerobic tank; 44 - first mixing tank; 45 - second mixing tank; 46 - secondary sedimentation tank; 47 - coagulation tank; 48 - inclined tube sedimentation tank; 49 - MBBR packing; 410 - influent branch pipe; 411 - first influent valve; 412 - second influent valve; 413 - carbon source dosing pipe; 414 - first carbon source valve; 415 - second carbon source valve; 416 - first internal reflux pipe; 417 - first reflux pump; 418 - first reflux valve; 419 - second internal reflux pipe; 420 - second reflux pump; 421 - second reflux valve; 422 - external reflux pipe; 423 - third reflux pump; 424 - third reflux valve; 425 - aeration pipeline; 426 - first aeration valve; 427 - second aeration valve; 428 - biochemical sludge discharge pump; 429 - physicochemical sludge discharge pump; 430 - PAC dosing pipe; 5 - total influent pipe; 6 - total effluent pipe; 7 - PLC control system; 8 - carbon source dosing pump; 9 - PAC dosing pump; 10 - aeration unit; 11 - advanced treatment unit. Detailed implementation manners

[0020] Combined with the specific content of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, which does not constitute a limitation to the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0021] First, the following explanations are made for the terms that may be used in this article:

[0022] The term "and / or" means that either or both of the two can be realized. For example, X and / or Y means that it includes both the cases of "X" or "Y" and the three cases of "X and Y".

[0023] Descriptions with semantic meanings such as "including", "comprising", "containing", "having" or other similar ones should be interpreted as non-exclusive inclusion. For example: including a certain technical feature element (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, processes, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or articles, etc.), it should be interpreted as not only including the clearly listed certain technical feature element, but also including other well-known technical feature elements in the art that are not clearly listed.

[0024] The term "consisting of" means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim a closed type, so that it does not include technical feature elements other than the explicitly listed ones, except for the related conventional impurities. If this term only appears in a sub-clause of a claim, then it only limits the elements explicitly listed in that sub-clause, and the elements recorded in other sub-clauses are not excluded from the overall claim.

[0025] Unless otherwise explicitly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0026] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of the description, rather than explicitly or implicitly indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this article.

[0027] The solutions provided by the present invention will be described in detail below. The content not described in detail in the embodiments of the present invention belongs to the prior art well-known to those of ordinary skill in the art. For those conditions not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the art or the conditions recommended by the manufacturer. For the reagents or instruments not indicating the manufacturer in the embodiments of the present invention, they are all conventional products that can be obtained through commercial purchase.

[0028] As Figure 1 shown, the embodiment of the present invention provides an integrated rural sewage treatment system with automatic switching of multiple operating modes, including:

[0029] A regulating tank 1, a lift pump 2, a liquid level gauge 3, multiple integrated sewage treatment devices 4, a total inlet pipe 5, a total outlet pipe 6, a PLC control system 7, multiple carbon source dosing pumps 8, multiple PAC dosing pumps 9, and an aeration unit 10;

[0030] The level gauge 3 is arranged in the regulating tank 1. The water outlet of the regulating tank 1 is connected to the main inlet pipe 5. A lift pump 2 is arranged on the main inlet pipe 5. The outlet end of the main inlet pipe 5 is connected in parallel with a plurality of inlet branch pipes. An inlet valve is arranged on each inlet branch pipe. Each inlet branch pipe is connected to an integrated sewage treatment device 4. A plurality of integrated sewage treatment devices 4 are connected in parallel;

[0031] The outlet end of each integrated sewage treatment device 4 is connected to an outlet branch pipe. Each outlet branch pipe is connected to the main outlet pipe 6 and is connected to the advanced treatment unit 11 through the main outlet pipe 6;

[0032] Each carbon source dosing pump 8 is connected to the carbon source dosing pipe of an integrated sewage treatment device 4;

[0033] Each PAC dosing pump 9 is connected to the PAC dosing pipe of an integrated sewage treatment device 4;

[0034] The aeration unit 10 is respectively connected to the aeration pipelines of the integrated sewage treatment devices 4;

[0035] The PLC control system 7 is respectively electrically connected to the level gauge 3, the lift pump 2, each carbon source dosing pump 8 and each inlet valve. It can predict the water volume in the regulating tank according to the level value of the regulating tank 1 measured by the level gauge 3, and combine the daily treatment capacity of a single integrated sewage treatment device 4 according to the predicted water volume in the regulating tank, and automatically control the start and stop times of the lift pump and the corresponding carbon source dosing pump 8, the corresponding PAC dosing pump 9 and the switches of each electric valve to select the number of operating integrated sewage treatment devices; and can predict the inlet water quality concentration according to the level value of the regulating tank 1 measured by the level gauge 3, and automatically control the currently operating integrated sewage treatment device to operate according to the corresponding treatment mode based on the predicted inlet water quality concentration, so that the integrated sewage treatment device treats sewage according to the corresponding treatment process. In this way, under the condition of unattended operation, according to the changes in the water volume and water quality of the regulating tank, the operating process can be automatically switched, the process operating parameters can be adjusted in time, and the number of integrated sewage treatment devices can be automatically selected.

[0036] See Figure 2 , preferably, in the above system, the structures of the integrated sewage treatment devices 4 are the same, and each includes:

[0037] Anaerobic tank 41, anoxic tank 42, aerobic tank 43, first mixing tank 44, second mixing tank 45, secondary sedimentation tank 46, coagulation tank 47, inclined tube sedimentation tank 48, influent branch pipe 410, first influent valve 411, second influent valve 412, carbon source dosing pipe 413, first carbon source valve 414, second carbon source valve 415, first reflux valve 418, second reflux valve 421, third reflux valve 424, first aeration valve 426, second aeration valve 427, first reflux pump 417, second reflux pump 420, third reflux pump 423, first internal reflux pipe 416, second internal reflux pipe 419, external reflux pipe 422, aeration pipeline 425, biochemical sludge discharge pump 428, physicochemical sludge discharge pump 429 and PAC dosing pipe 430; wherein,

[0038] The anaerobic tank 41 is sequentially connected to the anoxic tank 42, aerobic tank 43, first mixing tank 44, second mixing tank 45, secondary sedimentation tank 46, coagulation tank 47 and inclined tube sedimentation tank 48;

[0039] MBBR fillers 49 are provided in the anoxic tank 42, aerobic tank 43, first mixing tank 44 and second mixing tank 45, and the filling ratio of the MBBR fillers 49 is 15% - 30%;

[0040] The two branches of the influent branch pipe 410 are respectively connected to the anaerobic tank 41 and the first mixing tank 44, and the first influent valve 411 and the second influent valve 412 are respectively provided on the two branches;

[0041] The carbon source dosing pipe 413 is connected to the carbon source dosing pump 8, the two branches of the carbon source dosing pipe 413 are respectively connected to the anaerobic tank 41 and the first mixing tank 44, and the first carbon source valve 414 and the second carbon source valve 415 are respectively provided on the two branches;

[0042] The PAC dosing pipe 430 is connected to the corresponding PAC dosing pump 9, and the PAC dosing pipe 430 is connected to the coagulation tank 47, and can dose PAC medicament into the coagulation tank 47 respectively;

[0043] The first mixing tank 44 is connected back to the anaerobic tank 41 through the first internal reflux pipe 416, and the first reflux pump 417 and the first reflux valve 418 are respectively provided on the first internal reflux pipe 416;

[0044] The secondary sedimentation tank 46 is connected back to the anaerobic tank 41 through the second internal reflux pipe 419, and the second reflux pump 420 and the second reflux valve 421 are respectively provided on the second internal reflux pipe;

[0045] The biochemical sludge discharge pump 428 is connected between the secondary sedimentation tank 46 and the sludge storage tank, and can discharge the surplus sludge of the secondary sedimentation tank into the sludge storage tank;

[0046] The physical and chemical sludge discharge pump 429 is connected between the inclined tube sedimentation tank 48 and the sludge storage tank, and can discharge the physical and chemical sludge in the inclined tube sedimentation tank into the sludge storage tank;

[0047] The coagulation tank 47 is connected back to the anaerobic tank 41 through the external reflux pipe 422, and a third reflux pump 423 and a third reflux valve 424 are respectively arranged on the external reflux pipe 422;

[0048] The aeration unit 8 is connected to the aeration pipeline 426. The aeration pipeline 426 is connected to the bottom of the aerobic tank 43 through a first aeration branch pipe provided with a first aeration valve 426, and the aeration pipeline 426 is connected to the bottom of the second mixing tank 45 through a second aeration branch pipe provided with a second aeration valve 427.

[0049] Preferably, in the above system, the number of the integrated sewage treatment devices 4 matches the daily treatment scale of the station. The number of integrated sewage treatment devices n = the daily treatment volume Q (m 3 / d) of the station / the daily treatment volume q (m 3 / d) of a single integrated sewage treatment device. Usually, for the stations with a daily treatment scale Q ≤ 1000 m 3 , concrete or stainless steel prefabricated water plants are usually adopted. The daily treatment volume q of a single integrated sewage treatment device is 5 m 3 ~200 m 3 , and for the convenience of subsequent operation and maintenance, the number of integrated sewage treatment devices is usually selected as 2 - 5. 3

[0050] Preferably, in the above system, when the planar dimension (effective planar area S, designed maximum water depth H max ) of the regulating tank, the daily treatment volume q of a single integrated sewage treatment device, and the flow rates of a single lift pump, carbon source dosing pump, and PAC dosing pump are known, the PLC control system 7 reads the liquid level of the regulating tank and converts it into the water volume and water quality concentration of the regulating tank, and can automatically match the operation number of the integrated sewage treatment devices and the process operation mode, and match the start and stop times of the lift pump, carbon source dosing pump, and PAC dosing pump and their corresponding electric valves, specifically including:

[0051] Step 21, divide the liquid level of the regulating tank into multiple liquid level intervals, namely the protection low liquid level H p , the start liquid level H S , the continuous operation liquid level H 1 of one integrated sewage treatment device, the continuous operation liquid level H 2 of two integrated sewage treatment devices, the continuous operation liquid level H 3 of three integrated sewage treatment devices, the continuous operation liquid level H 4 of four integrated sewage treatment devices;, the continuous operation liquid level H of n - 1 integrated sewage treatment devices n-1 , the continuous operation liquid level H of n integrated sewage treatment devices n , all liquid level intervals are set according to the actual operating conditions and can be modified on the host computer;

[0052] The theoretical number n of integrated sewage treatment devices at the station: n = Q / q, n is a positive integer, 1 ≤ n ≤ 5, H n ≤ H max ;

[0053] The protection liquid level H p ≤ 1m, n integrated sewage treatment devices operate intermittently according to the preset intermittent operation duration, and the preset intermittent operation duration is set according to the actual operating requirements and can be modified on the host computer;

[0054] The start - up liquid level H S , H p <H s ≤ H p + 1×q / S; n integrated sewage treatment devices operate alternately according to the preset alternate operation duration, and the preset alternate operation duration is set according to the actual operating requirements and can be modified on the host computer;

[0055] The continuous operation liquid level H of 1 integrated sewage treatment device 1 , H p + 1×q / S < H 1 ≤ H p +(1 + 1)q / S, 1 integrated sewage treatment device operates continuously, and the other n - 1 integrated sewage treatment devices operate alternately according to the preset alternate operation duration, and the preset alternate operation duration is set according to the actual operating requirements and can be modified on the host computer;

[0056] The continuous operation liquid level H of 2 integrated sewage treatment devices 2 , H p + 2×q / S < H 2 ≤ H p +(1 + 2)q / S, 2 integrated sewage treatment devices operate continuously, and the other n - 2 integrated sewage treatment devices operate alternately according to the preset alternate operation duration, and the preset alternate operation duration is set according to the actual operating requirements and can be modified on the host computer;

[0057] The continuous operation liquid level H of 3 integrated sewage treatment devices 3 , H p + 3×q / S < H 3 ≤ H p+(1 + 3)q / S. Three integrated sewage treatment devices operate continuously, and the other n - 3 integrated sewage treatment devices operate alternately according to the preset alternating operation duration, which is set according to the actual operation requirements and can be modified on the host computer;

[0058] The liquid level H of n - 1 integrated sewage treatment devices operating continuously n-1 , H p +(n - 1)×q / s < H n-1 ≤ H p +(1 + n - 1)q / s,, n integrated sewage treatment devices operate continuously;

[0059] The liquid level H of n integrated sewage treatment devices operating continuously n , H p +n×q / S < H n ≤ H max , n integrated sewage treatment devices operate continuously;

[0060] Step 22, the control methods for each liquid level are as follows:

[0061] 221) Control method for the protection low liquid level H p : When the liquid level H in the regulating tank = H p ≤ 1.00m, enter the H p control stage. The lift pump, carbon source dosing pump, and PAC dosing pump do not work. n integrated sewage treatment devices operate according to the intermittent operation duration and intermittent stop duration preset by the host computer. In the H p control stage, each operating integrated sewage treatment device operates in the high influent concentration AAO process mode; when the H p control stage lasts for more than 12h, in the intermittent operation stage, open the carbon source dosing pump and the first carbon source electric valve of the currently operating integrated sewage treatment device to add carbon source to the currently operating integrated sewage treatment device, and close the carbon source dosing pump and the first carbon source electric valve of the currently operating integrated sewage treatment device in the intermittent stop stage;

[0062] 222) Control method for the start - up liquid level H S : When the liquid level H in the regulating tank = H S , and it satisfies H s = H p +q / S, when the liquid level in the regulating tank is less than H s < H p +q / S, operate according to the control method in the H p control stage; when the liquid level H in the regulating tank = H p +q / S, automatically switch from the H P control stage to the H SDuring the control stage, subsequently, when the liquid level in the regulating tank is within the range of 1.0 m to H s interval, then operate according to H S control stage until the liquid level deviates from this liquid level interval; during the H S control stage, turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and their corresponding electric valves, and operate according to the start and stop durations preset by the upper computer (for example, start for 2 minutes and stop for 5 minutes). n integrated sewage treatment devices operate alternately according to the alternate operation duration and alternate stop duration preset by the upper computer. During the H s control stage, each integrated sewage treatment device operates in the high influent concentration AAOAO process mode;

[0063] 223) Control method for continuous operation of 1 integrated sewage treatment device at liquid level H 1 : When the liquid level in the regulating tank H = H 1 , enter the H 1 control stage, that is, H p +1×q / S < H 1 ≤ H p +(1 + 1)q / S. Turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and their corresponding electric valves. 1 integrated sewage treatment device operates continuously, and the other n - 1 integrated sewage treatment devices operate alternately according to the alternate operation duration and alternate stop duration preset by the upper computer. During the H 1 control stage, each integrated sewage treatment device operates in the high influent concentration AAOAO process mode;

[0064] 224) Control method for continuous operation of 2 integrated sewage treatment devices at liquid level H 2 : When the liquid level in the regulating tank H = H 2 , enter the H 2 control stage, that is, H p +2×q / S < H 2 ≤ H p +(1 + 2)q / S. Turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and their corresponding electric valves. 2 integrated sewage treatment devices operate continuously, and the other n - 2 integrated sewage treatment devices operate alternately according to the alternate operation duration and alternate stop duration preset by the upper computer. During the H 2 control stage, each integrated sewage treatment device operates in the medium influent concentration AAOAA process mode;

[0065] 225) Control method for continuous operation of 3 integrated sewage treatment devices at liquid level H 3 : When the liquid level in the regulating tank H = H 3 , enter the H 3 control stage, that is, H p +3×q / S < H 3≤H p +(1 + 3)q / S, turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and their corresponding electric valves. 3 integrated sewage treatment devices operate continuously, and the other n - 3 integrated sewage treatment devices operate alternately according to the alternating operation duration and alternating stop duration preset by the host computer. At H 3 Control stage, each integrated sewage treatment device operates according to the AAOAA process mode with medium influent concentration;

[0066] 226) Control method for the liquid level H of n - 1 integrated sewage treatment devices operating continuously n-1 When the regulating tank liquid level H = H n-1 , enter the H n-1 Control stage, that is, H p +(n - 1)×q / S < H n-1 ≤H p +n×q / S, turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and their corresponding electric valves. All n integrated sewage treatment devices operate continuously. At H n-1 Control stage, each integrated sewage treatment device operates according to the AAOAA process mode with medium influent concentration;

[0067] 227) Control method for the liquid level H of n integrated sewage treatment devices operating continuously n When the regulating tank liquid level H = H n , enter the H n Control stage, that is, H s +(n - 1)×q / S ≤ H n ≤H max When, turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and their corresponding electric valves. All n integrated sewage treatment devices operate continuously. At H n Control stage, each integrated sewage treatment device operates according to the SBR + AO process mode with low influent concentration.

[0068] Preferably, in the above system, in the control method for protecting the low liquid level H p in step 22, the intermittent operation duration and intermittent stop duration preset by the host computer are generally set as follows:

[0069] The intermittent operation duration is 10 minutes, and the intermittent stop duration is 150 minutes. These duration settings can be modified on the host computer according to actual operation requirements.

[0070] Preferably, in the above system, in the control method for the start-up liquid level H S in step 22, the alternating operation duration and alternating stop duration preset by the host computer are respectively:

[0071] The alternating operation duration is 120 minutes, and the alternating stop duration is 240 minutes. These duration settings can be modified on the host computer according to the actual operation requirements.

[0072] Preferably, in the above system, the continuous operation liquid level H of the one integrated sewage treatment device in step 22 1 In the control mode, the preset alternating operation duration and alternating stop duration on the host computer are respectively:

[0073] The alternating operation duration is 60 minutes, and the alternating stop duration is 60 minutes. These duration settings can be modified on the host computer according to the actual operation requirements.

[0074] Preferably, in the above system, the continuous operation liquid level H of the two integrated sewage treatment devices in step 22 2 In the control mode, the preset alternating operation duration and alternating stop duration on the host computer are respectively: the intermittent operation duration is 60 minutes, and the intermittent stop duration is 60 minutes. These duration settings can be modified on the host computer according to the actual operation requirements.

[0075] Preferably, in the above system, the continuous operation liquid level H of the three integrated sewage treatment devices in step 22 3 In the control mode, the preset alternating operation duration and alternating stop duration on the host computer are respectively: the intermittent operation duration is 60 minutes, and the intermittent stop duration is 60 minutes. These duration settings can be modified on the host computer according to the actual operation requirements.

[0076] Preferably, in the above system, the continuous operation liquid level H of the n - 1 integrated sewage treatment devices in step 22 n-1 In the control mode, all the integrated sewage treatment devices operate continuously without setting alternating or intermittent operation durations.

[0077] The chemical addition amount is calculated based on the influent concentration with a 90% compliance rate detected by the laboratory in this station, and then according to the water volume and the number of operating integrated sewage treatment devices, the chemical is added according to a fixed chemical addition amount. For example: one integrated sewage treatment device adds 1 L of chemical per day, two integrated sewage treatment devices add 2 L, and n integrated sewage treatment devices add n L. Knowing the flow rate of the chemical addition pump and the number of operating integrated sewage treatment devices, the number of units and the start - stop time of the carbon source and PAC chemical addition pumps can be controlled.

[0078] Preferably, in the above system, the PLC control system 7, according to the liquid level of the regulating tank measured by the liquid level gauge, based on the sampling data of the laboratory and the relationship between the liquid level of the regulating tank, can predict the influent water quality concentration according to the liquid level, and automatically switch the operation process and adjust the process parameters, including:

[0079] The predicted influent water quality concentration based on the liquid level value of the regulating tank measured by the said liquid level gauge is:

[0080] The high-concentration liquid level control range is: H P ≤H≤1 + q / S;

[0081] The medium-concentration liquid level control range is: 1 + q / S < H ≤ 1 + (n - 1)q / S;

[0082] The low-concentration liquid level control range is: (n - 1)q / S < H ≤ H max ;

[0083] During non-rainy periods, when the liquid level H of the regulating tank is within H P ≤H≤1 + q / S, with the unit of liquid level being m, the influent concentration is defined as the high influent concentration, and its water quality index range is: COD < 500 mg / L, ammonia nitrogen < 70 mg / L, influent TN < 80 mg / L, and effluent TN < 15 mg / L. The integrated sewage treatment equipment operates according to the high-concentration influent water quality treatment mode, that is, it operates using the AAOAO treatment process;

[0084] During the rainfall stage, in the first 30 minutes of the initial rain and the 30 minutes after the rain, when the liquid level H of the regulating tank is within 1 + q / S < H ≤ 1 + (n - 1)q / S, the influent concentration is defined as the medium influent concentration, and its water quality index range is: COD < 350 mg / L, ammonia nitrogen < 50 mg / L, influent TN < 60 mg / L, and effluent TN < 10 mg / L. The integrated sewage treatment equipment operates according to the medium-concentration influent water quality treatment mode, that is, it uses the AAOAA treatment process;

[0085] After the initial rain during the rainfall stage, when the liquid level H of the regulating tank is within (n - 1)q / S < H ≤ H max , the influent concentration is defined as the low influent concentration, and its water quality index range is: COD < 100 mg / L, ammonia nitrogen < 20 mg / L, and influent TN < 30 mg / L. The integrated sewage treatment equipment operates according to the low-concentration influent water quality treatment mode, that is, it uses the SBR + AO treatment process.

[0086] Preferably, in the above system, the high-concentration influent water quality treatment mode of the said integrated sewage treatment equipment is:

[0087] When the predicted influent water quality is under the condition of high-concentration influent, the integrated sewage treatment equipment in the intermittent or alternating operation stage operates according to the AAOAO treatment process, changing the first mixing tank into an anoxic tank and the second mixing tank into an aerobic tank. Specifically: Open the first influent valve of the integrated sewage treatment equipment to control 90% of the influent water volume to enter the first anoxic tank, and open the second influent valve to control 10% of the influent water volume to enter the first mixing tank; Open the second carbon source electric valve and close the first carbon source electric valve; Open the first aeration valve and the second aeration valve. The first reflux pump and the first reflux valve are always open, the second reflux pump and the second reflux valve are always open, the third reflux pump is intermittently switched on for 1 minute and off for 119 minutes, the third reflux valve is always open, and the rest of the equipment is always on;

[0088] All valves of the stopped integrated sewage treatment equipment are normally closed;

[0089] The treatment mode of the medium-concentration influent water quality of the integrated sewage treatment equipment is as follows:

[0090] When the predicted influent water quality is under the condition of medium-concentration influent, the operating integrated sewage treatment equipment operates according to the AAOAA process, that is, both the first mixing tank and the second mixing tank are anoxic tanks. Specifically: Open the first influent valve of the integrated sewage treatment equipment to control 80% of the influent water volume to enter the first anoxic tank, and control the second influent valve to make 20% of the influent water volume enter the first mixing tank; Open the second carbon source valve and close the first carbon source valve; Open the first aeration valve and close the second aeration valve; Close the first reflux pump and the first reflux valve, keep the second reflux pump and the second reflux valve always open, intermittently switch on the third reflux pump for 1 minute and off for 119 minutes, keep the third reflux valve always open, and keep the rest of the equipment always on;

[0091] All valves of the stopped integrated sewage treatment equipment are normally closed;

[0092] The treatment mode of the low-concentration influent water quality of the integrated sewage treatment equipment is as follows:

[0093] When the predicted influent water quality is in the condition of low - concentration influent, all integrated sewage treatment equipment operates according to the SBR + AO process. That is, the anaerobic tank and the anoxic tank become sludge storage tanks, the aerobic tank becomes an intermittent aeration tank, the first mixing tank becomes an anoxic tank, and the second mixing tank becomes an aerobic tank. Specifically: In the starting stage, open the second reflux valve, the second reflux pump, the third reflux valve and the third reflux pump in the integrated sewage treatment equipment, and make all the sludge in the second mixing tank and the secondary sedimentation tank reflux to the anaerobic tank and the anoxic tank according to the reflux duration preset by the upper computer; then restore the first reflux pump and the first reflux valve to be closed, the second reflux pump and the second reflux valve to be always open, the third reflux pump to be intermittently switched on for 1 minute and off for 119 minutes, and the third reflux valve to be always open; open the first influent valve to control 10% of the influent water volume to enter the anaerobic tank to maintain the sludge activity, and open the second influent valve to control 90% of the influent water volume to enter the first mixing tank; at the same time, close the first carbon source valve and open the second carbon source valve to add the carbon source to the first mixing tank; turn off the stirrers in the anoxic tank and the anaerobic tank, intermittently switch the first aeration valve in the aerobic tank, and keep the second aeration valve in the mixing tank always open; the rest of the equipment operates normally.

[0094] In summary, it can be seen that the sewage treatment system of the embodiment of the present invention can dynamically adjust the operation quantity of the integrated sewage treatment equipment and the operation modes of each integrated sewage treatment equipment according to the predicted water volume and water quality, automatically meet the treatment requirements of different water volumes and water qualities, and make the effluent water quality reach the standard stably.

[0095] In order to more clearly show the technical solutions provided by the present invention and the technical effects produced, the following uses specific embodiments to describe in detail the solutions provided by the embodiments of the present invention.

[0096] Embodiment 1

[0097] As Figure 1 shown, this embodiment provides an integrated rural sewage treatment system with automatic switching of multiple operation modes, including:

[0098] A regulating tank 1, a lift pump 2, a level gauge 3, multiple integrated sewage treatment equipment 4, a total influent pipe 5, a total effluent pipe 6, a PLC control system 7, multiple carbon source dosing pumps 8 and multiple PAC dosing pumps 9. Among them, the integrated sewage treatment equipment consists of an anaerobic tank 41, an anoxic tank 42, an aerobic tank 43, a first mixing tank 44, a second mixing tank 45, a secondary sedimentation tank 46, a coagulation tank 47 and an inclined tube sedimentation tank 48 connected in sequence. Among them, MBBR fillers are placed in the anoxic tank 42, the aerobic tank 43, the first mixing tank 44 and the second mixing tank 45, and the filling ratio is between 15% and 30%. In addition, the PLC control system 7 contains the control logic for automatic switching of multiple operation modes and the control of main process parameters.

[0099] A liquid level gauge 3 is installed in the regulation tank, and a lift pump 2 is installed on the main inlet pipe 5. The sewage collected in the regulation tank 1 enters the main inlet pipe 5 through the lift pump 2 and is then distributed to the corresponding integrated sewage treatment equipment through each inlet branch pipe. The liquid level gauge measures the liquid level of the regulation tank;

[0100] Multiple integrated sewage treatment equipment are connected in parallel. The front-end inlet branch pipes of each integrated sewage treatment equipment are all connected to the main inlet pipe 5, and the rear-end outlet branch pipes are all connected to the main outlet pipe. An inlet valve is installed on the inlet branch pipe of each integrated sewage treatment equipment;

[0101] The PLC control system 7 in the above system can be composed of a PLC control station and control cabinets corresponding to controlling each integrated sewage treatment equipment. The PLC control station is communicatively connected to each control cabinet, and each control cabinet is electrically connected to the corresponding integrated sewage treatment equipment it controls.

[0102] The PLC control system 7 with automatic switching of multiple modes includes two parts: The first part is to predict the water volume based on the liquid level of the regulation tank and automatically select the number of integrated sewage treatment equipment in operation. The PLC reads the liquid level H signal measured by the liquid level gauge of the regulation tank. According to the planar area of the regulation tank, the liquid level signal can predict the change in the water volume of the regulation tank. According to the water volume of the regulation tank and the daily treatment capacity of a single integrated sewage treatment equipment, the start and stop times of the lift pump, carbon source dosing pump, and PAC dosing pump can be matched, and the number of integrated sewage treatment equipment in operation can be automatically selected. To better understand these control methods, the following is described with a case:

[0103] The design scale of common rural sewage treatment using integrated sewage treatment equipment is below 1000m 3 / d. Usually, for those with a design scale ≥ 1000m 3 , concrete or stainless steel prefabricated water plants are used. The daily treatment scale of a single integrated sewage treatment equipment is between 5m 3 ~200m 3 . For the convenience of subsequent operation and maintenance, the number of integrated sewage treatment equipment is usually 1 - 5.

[0104] This embodiment takes a certain station with a treatment capacity Q = 500m 3 / d as an example. The specific method is as follows: 5 integrated sewage treatment equipment are connected in parallel. The treatment capacity of a single integrated sewage treatment equipment q = 100m 3 / d. The effective area of the regulation tank is 200m 2 . The flow rate of the lift pump is 15m 3 / h. The water depth of the regulation tank is 4 meters, that is, q / s = 0.5. The liquid level of the regulation tank is divided into 7 intervals, namely the protection low liquid level H p , the start liquid level H S , 1 integrated sewage treatment equipment runs continuously at the liquid level H1 For the continuous operation of 2 integrated sewage treatment devices, the liquid level is H 2 For the continuous operation of 3 integrated sewage treatment devices, the liquid level is H 3 For the continuous operation of 4 integrated sewage treatment devices, the liquid level is H 4 For the continuous operation of 5 integrated sewage treatment devices, the liquid level is H 5 The interval liquid level is open on the upper computer and can be modified according to actual needs. The specific control is as follows:

[0105] Step 22, the control methods for each liquid level are as follows:

[0106] 221) Control method for the protection low liquid level H p When the liquid level in the regulating tank H = H p ≤1.00m, enter the H p control stage. Control the lift pump, carbon source dosing pump, and PAC dosing pump not to work. n integrated sewage treatment devices operate intermittently according to the intermittent operation duration and intermittent stop duration preset by the upper computer. The currently operating integrated sewage treatment devices all operate in the high influent concentration AAOAO process mode; when the H p control stage duration exceeds 12h, during the intermittent operation stage, open the carbon source dosing pump and the first carbon source electric valve of the currently operating integrated sewage treatment device to add carbon source to the currently operating integrated sewage treatment device, and close the carbon source dosing pump and the first carbon source electric valve of the currently operating integrated sewage treatment device during the intermittent stop stage;

[0107] 222) Control method for the start-up liquid level H S When the liquid level in the regulating tank H = H S , H p <H s ≤H p +1×q / S, that is, when 1.00m<H = H S ≤1.50m, when the liquid level in the regulating tank is less than 1.50m, operate according to the control method of the H p control stage; when the liquid level in the regulating tank H reaches 1.50m, automatically switch from the H P control stage to the H S control stage. Subsequently, when the liquid level in the regulating tank is in the range of 1.0m to 1.5m, it will operate according to the H S control stage until the liquid level deviates from this range; during the H S control stage, open the lift pump, the corresponding carbon source dosing pump, and the PAC dosing pump, operate according to the start-stop duration preset by the upper computer, and n integrated sewage treatment devices operate alternately according to the alternate operation duration and alternate stop duration preset by the upper computer. All 5 integrated sewage treatment devices operate in the high influent concentration AAOAO process mode;

[0108] Control method for the continuous operation liquid level H of one integrated sewage treatment device 1 : When the regulating tank liquid level H = H 1 , H p +1×q / S < H 1 ≤H p +(1 + 1)q / s, that is, 1.50m < H = H 1 ≤2.00m, enter the H 1 control stage, turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and the corresponding valves, and operate according to the start-stop duration preset by the upper computer. One integrated sewage treatment device operates continuously, and the other four integrated sewage treatment devices operate alternately according to the alternate operation duration and alternate stop duration preset by the upper computer. During the H 1 control stage, all five integrated sewage treatment devices operate in the AAO process mode with high influent concentration;

[0109] Control method for the continuous operation liquid level H of two integrated sewage treatment devices 2 : When the regulating tank liquid level H = H 2 , H p +2×q / s < H 2 ≤H p +(1 + 2)q / s, that is, 2.00m < H = H 2 ≤2.50m, enter the H 2 control stage, turn on the lift pump, the corresponding carbon source dosing pump and the PAC dosing pump, and operate according to the start and stop duration preset by the upper computer. Two integrated sewage treatment devices operate continuously, and the other three integrated sewage treatment devices operate alternately according to the alternate operation duration and alternate stop duration preset by the upper computer. During the H 2 control stage, each integrated sewage treatment device operates in the AAOAA process mode with medium influent concentration;

[0110] Control method for the continuous operation liquid level H of three integrated sewage treatment devices 3 : When the regulating tank liquid level H = H 3 , H p +3×q / S < H 1 ≤H p +(1 + 3)q / S, that is, 2.50m < H = H 3 ≤3.00m, enter the H 3 control stage, turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and the corresponding valves, and operate according to the start-stop duration preset by the upper computer. Three integrated sewage treatment devices operate continuously, and the other integrated sewage treatment devices operate alternately according to the alternate operation duration and alternate stop duration preset by the upper computer. Others during the H 3During the control stage, all 5 integrated sewage treatment devices operate in the AAOAA process mode with medium-concentration influent concentration;

[0111] 226) Control method for the continuous operation liquid level H of 4 integrated sewage treatment devices 4 : When the liquid level H of the regulating tank = H 4 , H p + 4×q / S < H 1 ≤ H p + (1 + 4)q / S, that is, when 3.00m < H = H 4 ≤ 3.50m, enter the H 4 control stage, turn on the lift pump, the corresponding carbon source dosing pump and the PAC dosing pump, and operate according to the start and stop durations preset by the upper computer. All 5 integrated sewage treatment devices operate continuously, and all 5 integrated sewage treatment devices operate in the AAOAA process mode with medium-concentration influent concentration;

[0112] 227) Control method for the continuous operation liquid level H of 5 integrated sewage treatment devices 5 : When the liquid level H of the regulating tank = H 5 , H p + n×q / S < H n ≤ 4, that is, when 3.50m < H = H 5 ≤ 4m, enter the H 5 control stage, turn on the lift pump, the corresponding carbon source dosing pump, the PAC dosing pump and the corresponding valves, and operate according to the start and stop durations preset by the upper computer. All 5 integrated sewage treatment devices operate continuously, and all 5 integrated sewage treatment devices operate in the SBR+AO process mode with low influent concentration.

[0113] Preferably, in the above system, in the control method of the protection low liquid level H p in step 22, the intermittent operation duration and the intermittent stop duration preset by the upper computer are respectively:

[0114] The intermittent operation duration is 10 minutes, and the intermittent stop duration is 150 minutes.

[0115] Preferably, in the above system, in the control method of the start liquid level H S in step 22, the alternate operation duration and the alternate stop duration preset by the upper computer are respectively:

[0116] The alternate operation duration is 120 minutes, and the alternate stop duration is 240 minutes.

[0117] Preferably, in the above system, in the control method of the continuous operation liquid level H 1 of 1 integrated sewage treatment device in step 22, the alternate operation duration and the alternate stop duration preset by the upper computer are respectively:

[0118] The alternating operation duration is 60 minutes, and the alternating stop duration is 60 minutes.

[0119] For the continuous operation liquid level H of the two integrated sewage treatment devices 2 In the control mode, the preset intermittent operation duration and intermittent stop duration by the upper computer are respectively: the intermittent operation duration is 60 minutes, and the intermittent stop duration is 60 minutes.

[0120] For the continuous operation liquid level H of the three integrated sewage treatment devices 2 In the control mode, the preset intermittent operation duration and intermittent stop duration by the upper computer are respectively: the intermittent operation duration is 60 minutes, and the intermittent stop duration is 60 minutes.

[0121] Specifically, the size of the regulating tank is a known design parameter. According to the liquid level of the regulating tank, the water volume of the regulating tank can be calculated. The treatment capacity of the integrated sewage treatment device is also a design parameter. Subsequently, combined with the actual operation, the treatment capacity of one integrated sewage treatment device can be known. The water flow rates of the inlet pump and the chemical dosing pump can be known according to the nameplate and the actual water volume or chemical dosage per unit time. Knowing these, the number of integrated sewage treatment devices to be put into operation and the opening time of the water pumps can be predicted based on the water volume of the regulating tank. Generally, the water volume of the regulating tank should at least meet the water volume of one integrated sewage treatment device for one day to start the operation of the integrated sewage treatment device. If it is less than the treatment water volume of one integrated sewage treatment device for one day, the program will be in the low liquid level protection mode. The low liquid level is H p mode. The treatment water volume of one integrated sewage treatment device is H 1 For two, it is H 2 For n, it is H n These modes are converted according to the liquid level of the regulating tank. The liquid level of H 1 i.e., the water volume corresponding to the liquid level of the regulating tank can at least meet the water volume of one integrated sewage treatment device for one day. H 2 is at least to meet the treatment water volume of two integrated sewage treatment devices for one day. Hn is at least to meet the treatment water volume of n integrated sewage treatment devices for one day. Since there is no inlet water meter at the station, the chemical dosage is based on the detected inlet water concentration of 80% probability in the laboratory of this station. According to this inlet water concentration, the solid chemical dosage is added. For example: 1L of chemical is added to one integrated sewage treatment device for one day, 2L for two integrated sewage treatment devices, and NL for N integrated sewage treatment devices. Knowing the flow rate of the carbon source chemical dosing pump and the number of operating integrated sewage treatment devices, the number of carbon source chemical dosing pumps and their start / stop times can be controlled.

[0122] The second part is to predict the influent water quality concentration based on the regulating tank liquid level, and automatically select the operation and treatment process of the integrated sewage treatment equipment according to the predicted influent water quality concentration. The influent water quality concentration prediction model is based on the early stage of the project, combined with the project commissioning stage and the rainfall characteristics of the project location. The laboratory is used to monitor the water quality to explore the relationship between the influent concentration and the regulating tank liquid level during the non-rainy period, the initial rain (after rain) period of rainfall, and the stage after the initial rain (after rain) of rainfall. Finally, a prediction model of the rough regulating tank liquid level and the high, medium, and low range concentrations of the influent water quality is established. According to the actual situation, specifically: during the non-rainy period, since there are no industrial enterprises in rural sewage and there is no rainwater dilution, the influent water volume is small at this stage, and the influent concentration is defined as the high influent concentration. The water quality index range is: COD < 500 mg / L, ammonia nitrogen < 70 mg / L, influent TN < 80 mg / L, and effluent TN < 15 mg / L; during the rainfall stage, the influent concentration will increase during the first 30 minutes of the initial rain and the 30 minutes after the rain. The influent concentration at this stage is defined as the medium influent concentration. The water quality index range is: COD < 350 mg / L, ammonia nitrogen < 60 mg / L, influent TN < 70 mg / L, and effluent TN < 10 mg / L; after the initial rain during the rainfall stage, the influent concentration will decrease sharply and the water volume is relatively large. The influent concentration at this stage is low and is defined as the low influent concentration. The water quality index range is: COD < 100 mg / L, ammonia nitrogen < 20 mg / L, influent TN < 30 mg / L.

[0123] Similarly, taking a certain station with a total treatment volume Q = 300 m 3 / d as an example, 3 integrated sewage treatment equipment are connected in parallel. The treatment volume of a single integrated sewage treatment equipment is q = 100 m 3 / d, the effective area is 50 m 2 The flow rate of the lift pump is 15 m 3 / h, the depth of the regulating tank is 3 meters. The specific operation method of the integrated pumping station operation and treatment process is as follows:

[0124] When the regulating tank liquid level is 0 - 2.00 m, the integrated sewage treatment equipment implements the high influent concentration treatment process, that is, the AAOAO treatment process; when the regulating tank liquid level is 2.01 - 2.50, the integrated sewage treatment equipment implements the high influent concentration treatment process, that is, the AAOAA treatment process; when the regulating tank liquid level is 2.51 - 3.00 m, the integrated sewage treatment equipment implements the high influent concentration treatment process, that is, the SBR+AO treatment process.

[0125] The integrated sewage treatment equipment operates according to the predicted high-concentration, medium-concentration, and low-concentration influent water quality treatment modes for sewage treatment. Specifically:

[0126] (1) When the PLC control system 7 predicts that the influent water quality is in the condition of high-concentration influent, the integrated sewage treatment equipment operates according to the AAOAO process, that is, the first mixing tank becomes an anoxic tank and the second mixing tank becomes an aerobic tank. Specifically: Open the first influent valve of the integrated sewage treatment equipment to make 90% of the influent water volume enter the first anoxic tank, and control the second influent valve to make 10% of the influent water volume enter the first mixing tank; The second carbon source valve is opened and the first carbon source valve is closed; The first aeration valve and 2 are opened, the first reflux pump and the first reflux valve are always open, the second reflux pump and the second reflux valve are always open, the third reflux pump is intermittently switched (the opening time is 1 min and the closing time is 119 min), the third reflux valve is always open, and the switching duration is open on the upper computer and can be set by itself according to project needs. The rest of the equipment is always open. The intermittent or alternating operation time is set to be open on the upper computer. The integrated sewage treatment equipment in the intermittent or alternating operation stage operates according to the above AAOAO process. The influent valve, chemical dosing valve and other equipment of the stopped integrated sewage treatment equipment are always closed. This can ensure that when the water volume is insufficient, all 3 integrated sewage treatment equipment are involved in the treatment, and only the power consumption and chemical consumption of 1-2 integrated sewage treatment equipment are consumed, which can maintain the sludge activity and save unnecessary power consumption and chemical consumption at the same time.

[0127] (2) When the PLC control system 7 predicts that the influent water quality is in the condition of medium-concentration influent, the integrated sewage treatment equipment operates according to the AAOAA process, that is, both the first mixing tank and the second mixing tank are anoxic tanks. Specifically: Open the first influent valve of the integrated sewage treatment equipment to make 80% of the influent water volume enter the first anoxic tank, and control the second influent valve to make 20% of the influent water volume enter the first mixing tank; The second carbon source valve is opened and the first carbon source valve is closed; Open the first aeration valve and close the second aeration valve; The first reflux pump and the first reflux valve are closed, the second reflux pump and the second reflux valve are always open, the third reflux pump is intermittently switched (the opening time is 1 min and the closing time is 119 min), the third reflux valve is always open, and the switching duration is open on the upper computer and can be set by itself according to project needs. The rest of the equipment is always open. The operating integrated sewage treatment equipment operates according to the above AAOAA process. The influent valve, chemical dosing valve and other equipment of the stopped integrated sewage treatment equipment are always closed. This mode is to reduce the influence of the fluctuations in water quality and water volume on the effluent water quality when the integrated sewage treatment equipment switches between the high-concentration treatment process and the low-concentration process.

[0128] (3) When the PLC control system 7 predicts that the influent water quality is in the low-concentration influent condition, the integrated sewage treatment equipment operates according to the SBR+AO process. That is, the anaerobic tank and the anoxic tank become sludge temporary storage tanks, the aerobic tank becomes an intermittent aeration tank, the first mixing tank becomes an anoxic tank, and the second mixing tank becomes an aerobic tank. When the water concentration is low, generally the influent concentration is low and the water volume is large. In order to improve the treatment efficiency, maintain the sludge activity, and reduce the solid flux of the secondary sedimentation tank, it is necessary to pump the sludge in the secondary sedimentation tank back to the anaerobic tank for temporary storage. Using the MBBR filler in the AO process section in this mode to decompose the influent pollutants can meet the effluent requirements. Specifically: In the initial stage, open the second reflux valve and the third reflux valve and their corresponding reflux pumps in the integrated sewage treatment equipment, so that all the sludge in the second mixing tank and the secondary sedimentation tank flows back to the anaerobic tank and the anoxic tank. The reflux duration is open on the upper computer, generally set to 30 minutes. Then restore the normal state of the reflux valve and its reflux pump, that is, the first reflux pump and the first reflux valve are closed, the second reflux pump and the second reflux valve are always open, the third reflux pump is intermittently switched (the opening time is 1 minute, and the closing time is 119 minutes), the third reflux valve is always open, and the switching duration is open on the upper computer and can be set by itself according to the project needs. Open the first influent valve to control 10% of the influent water volume to enter the anaerobic tank (sludge temporary storage tank) to maintain the sludge activity, and control the second influent valve to make 90% of the influent water volume enter the first mixing tank; at the same time, close the first carbon source valve of the integrated sewage treatment equipment and open the second carbon source valve to add the carbon source to the first mixing tank; the agitators in the anoxic tank and the anaerobic tank are closed, the first aeration valve connected to the aerobic tank is intermittently switched, and the second aeration valve connected to the second mixing tank is always open; the rest of the equipment operates normally. All integrated sewage treatment equipment operates according to the above SBR+AO process, which can ensure that all integrated sewage treatment equipment participates in the treatment, maximally realizes the purification of the incoming water, and only consumes 40-50% of the power consumption and chemical consumption of the normal operation of the integrated sewage treatment equipment. At the same time, it also maintains the sludge activity. When the water volume drops to the low liquid level, the sludge temporarily stored in the anaerobic tank and the anoxic tank can enter the subsequent process unit with the influent water, and the integrated sewage treatment equipment can be restored to the AAOAO process operation in a short time, saving unnecessary reset time and material consumption.

[0129] All the above-mentioned valves are both manual and electric valves, which can realize manual and electric switching.

[0130] The above total treatment capacity Q = 300m 3 In the case of a certain station, the parallel connection method and its control logic embodiment only represent a preferred specific embodiment of the present invention. Its description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the claims.

[0131] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The information disclosed in the background art part of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or imply in any form that this information constitutes the prior art known to those skilled in the art.

Claims

1. An integrated rural sewage treatment system with automatic switching of multiple operation modes, characterized in that: include: A regulating tank (1), a lifting pump (2), a liquid level meter (3), a plurality of integrated sewage treatment equipment (4), a main water inlet pipe (5), a main water outlet pipe (6), a PLC control system (7), a plurality of carbon source dosing pumps (8), a plurality of PAC dosing pumps (9) and an aeration unit (10); The liquid level meter (3) is arranged in the regulating tank (1), the water outlet of the regulating tank (1) is connected to the main water inlet pipe (5), the main water inlet pipe (5) is provided with a lift pump (2), the water outlet end of the main water inlet pipe (5) is connected in parallel to a plurality of water inlet branch pipes, each water inlet branch pipe is provided with a water inlet valve, each water inlet branch pipe is connected to an integrated sewage treatment device (4), and the plurality of integrated sewage treatment devices (4) are connected in parallel; The water outlet of each integrated sewage treatment device (4) is connected to a water outlet branch pipe, each water outlet branch pipe is connected to the main water outlet pipe (6), and is connected to the deep treatment unit (11) through the main water outlet pipe (6); Each carbon source dosing pump (8) is connected to a carbon source dosing pipe of an integrated sewage treatment device (4); Each PAC dosing pump (9) is connected to a PAC dosing pipe of an integrated sewage treatment device (4); The aeration units (10) are respectively connected to the aeration pipelines of the integrated sewage treatment equipment (4); The PLC control system (7) is electrically connected to the liquid level meter (3), the lifting pump (2), each carbon source dosing pump (8) and each water inlet valve, respectively, and can predict the water volume of the regulating tank (1) according to the liquid level value of the regulating tank (1) measured by the liquid level meter (3), and automatically control the start and stop time of the lifting pump and the corresponding carbon source dosing pump (8), the corresponding PAC dosing pump (9) and the switch of each electric valve to select the number of integrated sewage treatment equipment in operation according to the predicted water volume of the regulating tank combined with the daily treatment capacity of the single integrated sewage treatment equipment (4); and can predict the influent water quality concentration according to the liquid level value of the regulating tank (1) measured by the liquid level meter (3), and automatically control the currently operating integrated sewage treatment equipment to operate according to the corresponding treatment mode according to the predicted influent water quality concentration, so that the integrated sewage treatment equipment treats sewage according to the corresponding treatment process.

2. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to claim 1 is characterized in that: Each integrated sewage treatment equipment (4) has the same structure, including: Anaerobic tank (41), anoxic tank (42), aerobic tank (43), first mixing tank (44), second mixing tank (45), second settling tank (46), coagulation tank (47), inclined tube sedimentation tank (48), water inlet branch pipe (410), first water inlet valve (411), second water inlet valve (412), carbon source addition pipe (413), first carbon source valve (414), second carbon source valve (415), first return valve (418), second return valve (419), 421), a third reflux valve (424), a first aeration valve (426), a second aeration valve (427), a first reflux pump (417), a second reflux pump (420), a third reflux pump (423), a first inner reflux pipe (416), a second inner reflux pipe (419), an outer reflux pipe (422), an aeration pipeline (425), a biochemical sludge pump (428), a physicochemical sludge pump (429) and a PAC dosing pipe (430); wherein, The anaerobic tank (41) is connected to the anoxic tank (42), the aerobic tank (43), the first mixing tank (44), the second mixing tank (45), the secondary sedimentation tank (46), the coagulation tank (47) and the inclined tube sedimentation tank (48) in sequence; MBBR fillers (49) are arranged in the anoxic tank (42), the aerobic tank (43), the first mixing tank (44) and the second mixing tank (45), and the filling ratio of the MBBR fillers (49) is 15% to 30%; The two branches of the water inlet branch pipe (410) are respectively connected to the anaerobic tank (41) and the first mixing tank (44), and the first water inlet valve (411) and the second water inlet valve (412) are respectively arranged on the two branches; The carbon source dosing pipe (413) is connected to the carbon source dosing pump (8), and two branches of the carbon source dosing pipe (413) are respectively connected to the anaerobic tank (41) and the first mixing tank (44), and the first carbon source valve (414) and the second carbon source valve (415) are respectively arranged on the two branches; The PAC dosing pipe (430) is connected to the corresponding PAC dosing pump (9), and the PAC dosing pipe (430) is connected to the coagulation tank (47); The first mixing tank (44) is connected back to the anaerobic tank (41) via a first internal return pipe (416), and a first return pump (417) and a first return valve (418) are respectively provided on the first internal return pipe (416); The secondary sedimentation tank (46) is connected back to the anaerobic tank (41) via a second internal return pipe (419), and a second return pump (420) and a second return valve (421) are respectively provided on the second internal return pipe; The coagulation tank (47) is connected back to the anaerobic tank (41) via an external return pipe (422), and a third return pump (423) and a third return valve (424) are respectively provided on the external return pipe (422); The biochemical sludge pump (428) is connected between the secondary sedimentation tank (46) and the sludge storage tank, and can discharge the residual sludge in the secondary sedimentation tank into the sludge storage tank; The physicochemical sludge discharge pump (429) is connected between the inclined tube sedimentation tank (48) and the sludge storage tank, and can discharge the physicochemical sludge in the inclined tube sedimentation tank into the sludge storage tank; The aeration unit (8) is connected to an aeration pipeline (426), and the aeration pipeline (426) is connected to the bottom of the aerobic tank (43) via a first aeration branch pipe provided with a first aeration valve (426), and the aeration pipeline (426) is connected to the bottom of the second mixing tank (45) via a second aeration branch pipe provided with a second aeration valve (427).

3. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to claim 1 is characterized in that: In the system, the number n of the integrated sewage treatment equipment (4) matches the total water volume Q of the regulating tank (1), and the number n is determined in the following manner, including: n=Q÷q, n is a positive integer, 1≤n≤5, H n ≤H max , H n represents the liquid level of n integrated sewage treatment equipment (4), H max represents the designed maximum water depth of the regulating tank (1); q represents the daily processing capacity of the integrated sewage treatment equipment (4).

4. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to claim 3 is characterized in that: The PLC control system (7) automatically controls the start and stop time of the lift pump and the carbon source dosing pump and the switch of each electric valve to select the number of integrated sewage treatment equipment to be operated according to the predicted water volume of the regulating tank and the daily processing volume of a single integrated sewage treatment equipment (4) in the following manner, including: Step 21, divide the liquid level of the regulating tank into multiple liquid level intervals, that is, protect the low liquid level H p , Start liquid level H S , 1 integrated sewage treatment equipment continuous operation level H1, 2 integrated sewage treatment equipment continuous operation level H2, 3 integrated sewage treatment equipment continuous operation level H3, 4 integrated sewage treatment equipment continuous operation level H4, n-1 integrated sewage treatment equipment continuous operation level H n-1 、n integrated sewage treatment equipment continuous operation liquid level H n ; Theoretical number of integrated sewage treatment equipment in the station: n = Q / q, n is a positive integer, 1 ≤ n ≤ 5, H n ≤H max ; Start level H S , H p <H s ≤H p +1×q / S; Step 22, the control method of each liquid level is as follows: 221) Protection of low liquid level H p Control method: When the liquid level in the regulating tank is H=H p , and satisfies H p ≤1.00m, enter H p In the control stage, the lifting pump, carbon source dosing pump and PAC dosing pump do not work, and the n integrated sewage treatment equipment runs according to the intermittent operation time and intermittent stop time preset by the host computer. p During the control phase, each integrated sewage treatment equipment is operated in the high influent concentration AAOAO process mode; p The control stage lasts for more than 12 hours. During the intermittent operation stage, the carbon source dosing pump and the first carbon source electric valve of the currently running integrated sewage treatment equipment are opened to add carbon source to the currently running integrated sewage treatment equipment. During the intermittent stop stage, the carbon source dosing pump and the first carbon source electric valve of the currently running integrated sewage treatment equipment are closed; 222) Start liquid level H S Control method: When the liquid level in the regulating tank is H=H S , and satisfies H s =H p +q / S, when the liquid level in the regulating tank H s <H p +q / S, press H p The control mode of the control stage is running; when the liquid level of the regulating tank H=H p +q / S, automatically from H P Control stage switches to H S In the control stage, the liquid level in the regulating tank is between 1.0m and H s interval, press H S The control stage runs until the liquid level deviates from the current liquid level range; S In the control stage, the lifting pump and the corresponding carbon source dosing pump and PAC dosing pump and their corresponding electric valves are turned on, and the n integrated sewage treatment equipments are operated alternately according to the alternating operation time and alternating stop time preset by the host computer. s During the control phase, each integrated sewage treatment equipment operates in the AAOAO process mode with high influent concentration; 223) The control method of the continuous operation liquid level H1 of an integrated sewage treatment equipment: When the liquid level of the regulating tank H=H1 and satisfies H p +1×q / S p +(1+1)q / S, enter the H1 control stage, turn on the lifting pump and the corresponding carbon source dosing pump and PAC dosing pump and their corresponding electric valves, one integrated sewage treatment equipment runs continuously, and the other n-1 integrated sewage treatment equipment runs alternately according to the alternating running time and alternating stopping time preset by the host computer. In the H1 control stage, each integrated sewage treatment equipment runs according to the high influent concentration AAOAO process mode;​ 224) The control method of the continuous operation liquid level H2 of two integrated sewage treatment equipment: When the liquid level H in the regulating tank is H = H2 and satisfies H p +2×q / S<H2≤H p +(1+2)q / S, enter the H2 control stage, turn on the lifting pump and the corresponding carbon source dosing pump and PAC dosing pump and their corresponding electric valves, and two integrated sewage treatment equipments will run continuously, and the other n-2 integrated sewage treatment equipments will run alternately according to the alternating running time and alternating stopping time preset by the host computer. In the H2 control stage, each integrated sewage treatment equipment will operate according to the medium influent concentration AAOAA process mode; 225) The control method of the continuous operation liquid level H3 of 3 integrated sewage treatment equipment: When the liquid level of the regulating tank H=H3 and satisfies H p +3×q / S<H3≤H p +(1+3)q / S, enter the H3 control stage, turn on the lifting pump and the corresponding carbon source dosing pump and PAC dosing pump and their corresponding electric valves, and the three integrated sewage treatment equipments will run continuously, and the other n-3 integrated sewage treatment equipments will run alternately according to the alternating running time and alternating stopping time preset by the host computer. In the H3 control stage, each integrated sewage treatment equipment will operate according to the medium influent concentration AAOAA process mode; 226)n-1 integrated sewage treatment equipment continuous operation liquid level H n-1 Control method: When the liquid level in the regulating tank is H=H n-1 , and satisfies H p +(n-1)×q / S<H n-1 ≤H p +n×q / S, enter H n-1 In the control stage, the lifting pump and the corresponding carbon source dosing pump and PAC dosing pump and their corresponding electric valves are turned on, and n integrated sewage treatment equipment are continuously operated. n-1 During the control phase, each integrated sewage treatment equipment was operated in the AAOAA process mode with medium influent concentration; 227) The continuous operation liquid level of n integrated sewage treatment equipment H n Control method: When the liquid level in the regulating tank is H=H n , and satisfies H s +(n-1)×q / S≤H n ≤H max When entering H n In the control stage, the lifting pump and the corresponding carbon source dosing pump and PAC dosing pump and their corresponding electric valves are turned on, and n integrated sewage treatment equipment are continuously operated. n During the control stage, each integrated sewage treatment equipment operates in the low influent concentration SBR+AO process mode.

5. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to claim 4 is characterized in that: The protection low liquid level H of step 22 p In the control mode, the intermittent running time and intermittent stopping time preset by the host computer are: The intermittent operation time is 10 minutes and the intermittent stop time is 150 minutes.

6. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to claim 4 is characterized in that: The starting liquid level H of step 22 S In the control mode, the alternating running time and alternating stopping time preset by the host computer are: The alternating operation time is 120 minutes, and the alternating stop time is 240 minutes.

7. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to claim 4 is characterized in that: In the control method of the continuous operation liquid level H1 of one integrated sewage treatment equipment in step 22, the alternating operation duration and the alternating stop duration preset by the host computer are respectively: The alternating operation time is 60 minutes, and the alternating stop time is 60 minutes.

8. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to claim 4 is characterized in that: In the control method of the continuous operation liquid level H2 of the two integrated sewage treatment equipments and the control method of the continuous operation liquid level H2 of the three integrated sewage treatment equipments in step 22, the intermittent operation duration and the intermittent stop duration preset by the host computer are respectively: The intermittent operation time is 60 minutes, and the intermittent stop time is 60 minutes.

9. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to any one of claims 1 to 8, characterized in that: The PLC control system (7) predicts the influent water quality concentration according to the liquid level value of the regulating tank measured by the liquid level meter in the following manner, and selects a corresponding control mode according to the predicted influent water quality concentration to automatically control the currently running integrated sewage treatment equipment so that the integrated sewage treatment equipment operates according to the corresponding treatment process, including: The inlet water quality concentration predicted according to the liquid level value of the regulating tank measured by the liquid level meter is: High concentration liquid level control range: H P ≤H≤1+q / S; The medium concentration liquid level control range is: 1+q / S<H≤1+(n-1)q / S; The low concentration liquid level control range is: (n-1)q / S<H≤H max ; During the non-rainfall period, when the liquid level H in the regulating tank is at H P When ≤H≤1+q / S, the influent concentration is defined as high influent concentration, and its water quality index range is: COD<500mg / L, ammonia nitrogen<70mg / L, influent TN<80mg / L and effluent TN<15mg / L. The integrated sewage treatment equipment operates in the high-concentration influent water quality treatment mode, that is, it adopts the AAOAO treatment process; During the rainfall stage, during the first 30 minutes of initial rain and 30 minutes after rain, when the liquid level H in the regulating tank is at 1+q / S<H≤1+(n-1)q / S, the influent concentration is defined as medium influent concentration, and its water quality index range is: COD<350mg / L, ammonia nitrogen<60mg / L, influent TN<60mg / L and effluent TN<10mg / L. The integrated sewage treatment equipment operates in the medium-concentration influent water quality treatment mode, that is, the AAOAA treatment process is adopted; After the initial rain in the rainfall stage, when the liquid level H in the regulating tank is at (n-1)q / S<H≤H max When the influent concentration is defined as low influent concentration, its water quality index range is: COD <100mg / L, ammonia nitrogen <20mg / L and influent TN <30mg / L. The integrated sewage treatment equipment operates in the low concentration influent water quality treatment mode, that is, the SBR+AO treatment process is adopted.

10. The integrated rural sewage treatment system with automatic switching of multiple operation modes according to any one of claims 2 to 8, characterized in that: The high-concentration influent water quality treatment mode of the integrated sewage treatment equipment is: When the predicted influent water quality is a high-concentration influent condition, the integrated sewage treatment equipment in the intermittent or alternating operation stage is operated according to the AAOAO treatment process, and the first mixing tank is changed into an anoxic tank, and the second mixing tank is changed into an aerobic tank, specifically: open the first inlet valve of the integrated sewage treatment equipment to control 90% of the influent water volume to enter the first anoxic tank, and open the second inlet valve to control 10% of the influent water volume to enter the first mixing tank; The second carbon source electric valve is opened, and the first carbon source electric valve is closed; the first aeration valve and the second aeration valve are opened, the first reflux pump and the first reflux valve are normally open, the second reflux pump and the second reflux valve are normally open, the third reflux pump is turned on for 1 minute and off for 119 minutes for intermittent switching, the third reflux valve is normally open, and the other equipment are normally open; All valves of the stopped integrated sewage treatment equipment are normally closed; The medium-concentration influent water quality treatment mode of the integrated sewage treatment equipment is: When the predicted influent water quality is a medium-concentration influent condition, the running integrated sewage treatment equipment is operated according to the AAOAA process, that is, the first mixing tank and the second mixing tank are both anoxic tanks; specifically: open the integrated sewage treatment equipment to control the first water inlet valve so that 80% of the influent water volume enters the first anoxic tank, and control the second water inlet valve so that 20% of the influent water volume enters the first mixing tank; the second carbon source valve is opened, and the first carbon source valve is closed; the first aeration valve is opened, and the second aeration valve is closed; the first reflux pump and the first reflux valve are closed, the second reflux pump and the second reflux valve are always open, the third reflux pump is turned on for 1 minute and turned off for 119 minutes for intermittent switching, the third reflux valve is always open, and the other equipment is always open; All valves of the stopped integrated sewage treatment equipment are normally closed; The low-concentration influent water quality treatment mode of the integrated sewage treatment equipment is: When the predicted influent water quality is a low-concentration influent condition, all integrated sewage treatment equipment is operated according to the SBR+AO process, that is, the anaerobic tank and the anoxic tank are changed into sludge temporary storage tanks, the aerobic tank is an intermittent aeration tank, the first mixing tank is changed into an anoxic tank, and the second mixing tank is changed into an aerobic tank. Specifically, in the initial stage, the second return valve, the second return pump, the third return valve and the third return pump in the integrated sewage treatment equipment are opened, and the sludge in the second mixing tank and the second sedimentation tank is all returned to the anaerobic tank and the anoxic tank according to the return time preset by the host computer; then the first return pump and the first return valve are restored to be closed, the second return pump and the second return valve are normally open, the third return pump is turned on for 1 minute and closed for 119 minutes for intermittent switching, and the third return valve is normally open; the first water inlet valve is opened to control 10% of the influent water volume to enter the anaerobic tank to maintain the sludge activity, and the second water inlet valve is opened to control 90% of the influent water volume to enter the first mixing tank; at the same time, the first carbon source valve is closed, and the second carbon source valve is opened to allow the carbon source to be added to the first mixing tank; The agitators in the anoxic tank and anaerobic tank are turned off, the first aeration valve in the aerobic tank is switched on and off intermittently, and the second aeration valve in the mixing tank is always open; the rest of the equipment operates normally.

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