CN112897821A - System and method suitable for distributed domestic sewage treatment - Google Patents
System and method suitable for distributed domestic sewage treatment Download PDFInfo
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- CN112897821A CN112897821A CN202110371045.XA CN202110371045A CN112897821A CN 112897821 A CN112897821 A CN 112897821A CN 202110371045 A CN202110371045 A CN 202110371045A CN 112897821 A CN112897821 A CN 112897821A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1263—Sequencing batch reactors [SBR]
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
本发明公开一种适用于分散式生活污水处理的系统及其方法，包括依次连通设置的进水管、反应池、沉淀池以及产水管；所述反应池和所述沉淀池之间连通有带通断阀门的间歇出水管和连续出水管；所述沉淀池内设置有沉淀池斜管，所述产水管和所述间歇出水管设置在所述沉淀池斜管的上部，所述连续出水管设置在所述沉淀池斜管的下部；所述反应池至少分成两格，每格内均设置有曝气装置，且每格内的所述曝气装置能够单独开启和关闭；本发明在传统的间歇运行的SBR工艺系统中设置连续出水管和间歇出水管，能够根据污水量的变化相应的切换为间歇运行方式或连续运行方式，从而能够较好的适应污水量的变化，适用于分散式生活污水处理。
The invention discloses a system and a method suitable for decentralized domestic sewage treatment, comprising a water inlet pipe, a reaction tank, a sedimentation tank and a water production pipe which are connected in sequence; The intermittent water outlet pipe and the continuous water outlet pipe of the valve; the sedimentation tank is provided with a sedimentation tank inclined pipe, the water production pipe and the intermittent water outlet pipe are arranged on the upper part of the sedimentation tank inclined pipe, and the continuous water outlet pipe is arranged in the The lower part of the inclined pipe of the sedimentation tank; the reaction tank is divided into at least two compartments, each compartment is provided with an aeration device, and the aeration device in each compartment can be opened and closed independently; The continuous water outlet pipe and the intermittent water outlet pipe are set in the SBR process system, which can be switched to intermittent operation mode or continuous operation mode according to the change of sewage volume, so as to better adapt to the change of sewage volume and suitable for decentralized domestic sewage treatment. .
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a system and a method suitable for distributed domestic sewage treatment.
Background
The traditional SBR process is called sequencing batch activated sludge process, and is a novel aerobic biological treatment technology. It employs a variable batch reactor, providing time-programmed wastewater treatment, rather than a continuous flow-provided spatial program. The conventional SBR method performs basic operations such as water inlet, reaction (aeration), sedimentation, water outlet, standby (idle) and the like in time sequence, and a period is defined from the start of inflow of sewage to the end of standby time, and the period is cyclically repeated, thereby achieving the purpose of sewage purification.
MBR (membrane bioreactor): a novel water treatment technology combining a membrane separation unit and a biological treatment unit. The membrane component replaces a secondary sedimentation tank at the tail end of the traditional biological treatment technology, the concentration of high-activity sludge is kept in a bioreactor, and the organic load of biological treatment is improved. Also belongs to a biochemical method, and mainly depends on the synthesis and decomposition of microorganisms to remove the water quality index in water. The MBR (membrane bioreactor) method has high construction cost and high requirements on the technical level of operation and maintenance. The anti impact load ability is poor, in order to reach the emission standard, reduce the impact of the quality of the incoming water, water yield change, set up the equalizing basin in front of the treatment facility at present mostly, and dwell time is longer, the buffer capacity is stronger, increased area like this, has increased the construction investment, and later stage operation maintenance has higher requirements for personnel, the maintenance of membrane module, the replacement expense is high, and the membrane module that gets off changed belongs to solid waste, is difficult to green processing.
In recent years, rural living environment is improved, rural domestic sewage treatment is vigorously raised, in terms of Tianjin in northern areas, thousands of rural sewage treatment stations are provided, one or more treatment stations are provided in each village, the centralized distribution of the treatment stations in urban or urban sewage treatment plants is not required, the treatment stations belong to distributed small-sized sewage treatment systems, and the MBR process is mostly adopted for rural domestic sewage treatment in Diwu areas, Ninghe areas and the like (anoxic-aerobic-precipitation process is adopted for high temperature in south, and different processes such as artificial rapid infiltration, purification tanks and the like are also adopted for high temperature in south).
In the actual operation process, the distributed domestic sewage, particularly rural sewage, has large water quality and water quantity change and is greatly influenced by the number of resident population and living habits, for example, the rural early, middle and late meals have large water discharge amount, other times are less, the water discharge rules in different seasons are different, and the MBR process and the SBR process cannot be well adapted to the distributed domestic sewage treatment.
Disclosure of Invention
The invention aims to provide a system and a method suitable for distributed domestic sewage treatment, which are used for solving the problems in the prior art, and the system is provided with a continuous water outlet pipe and an intermittent water outlet pipe in the traditional SBR process system which intermittently operates, and can be correspondingly switched into an intermittent operation mode or a continuous operation mode according to the change of the sewage quantity, so that the system can better adapt to the change of the sewage quantity and is suitable for distributed domestic sewage treatment.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a system suitable for distributed domestic sewage treatment, which comprises a water inlet pipe, a reaction tank, a sedimentation tank and a water production pipe, wherein the water inlet pipe, the reaction tank, the sedimentation tank and the water production pipe are sequentially communicated; an intermittent water outlet pipe with an on-off valve and a continuous water outlet pipe are communicated between the reaction tank and the sedimentation tank; a sedimentation tank inclined pipe is arranged in the sedimentation tank, the water production pipe and the intermittent water outlet pipe are arranged at the upper part of the sedimentation tank inclined pipe, and the continuous water outlet pipe is arranged at the lower part of the sedimentation tank inclined pipe; the reaction tank is at least divided into two grids, an aeration device is arranged in each grid, and the aeration device in each grid can be independently opened and closed.
Preferably, the reaction tank is divided into four compartments, and two adjacent compartments are communicated at the bottom or the top to form an S-shaped circulation path of the sewage.
Preferably, a sludge return pipe is arranged between the sedimentation tank and the reaction tank.
Preferably, a decanter is arranged between the reaction tank and the intermittent water outlet pipe and between the reaction tank and the continuous water outlet pipe, and sewage flows out of the reaction tank, passes through the decanter and then enters the intermittent water outlet pipe or the continuous water outlet pipe.
Preferably, a filter cloth is arranged between the sedimentation tank and the water production pipe, and sewage flows out of the water production pipe after being filtered by the filter cloth.
Preferably, a dosing device is included, and the dosing agent added by the dosing device comprises glucose and PAC polyaluminium chloride.
The invention also provides a method suitable for distributed domestic sewage treatment, which comprises the following steps:
(1) setting a sewage quantity threshold value, selecting an intermittent operation mode when the sewage quantity to be processed is smaller than the sewage quantity threshold value, and selecting a continuous operation mode when the sewage quantity to be processed exceeds the sewage quantity threshold value;
(2) when the intermittent operation mode is selected:
(2.1) sewage enters the reaction tank through the water inlet pipe, and water inlet is stopped when the sewage reaches a designed liquid level;
(2.2) carrying out aeration reaction;
(2.3) stopping the aeration reaction and entering a precipitation stage;
(2.4) discharging the produced water outwards through a water production pipe after the precipitation stage is finished;
(3) when the continuous operation mode is selected:
(3.1) closing the aeration device of the first grid to serve as an anoxic pond; the sewage continuously enters the first grid through the water inlet pipe, and simultaneously, the sludge in the sedimentation tank also flows back to enter the first grid;
(3.2) opening the aeration devices of other grids to serve as aerobic tanks; sewage continuously enters from the first grid and flows through other grids in sequence;
(3.3) when the liquid level of the sewage in the reaction tank reaches a set liquid level, allowing the sewage to enter a sedimentation tank for sedimentation;
and (3.4) discharging the precipitated sewage from the water production pipe to the produced water.
Preferably, the dissolved oxygen of the anoxic pond in the step (3.1) is controlled to be 0.2-0.5mg/L, and the dissolved oxygen of the aerobic pond in the step (3.2) is controlled to be 2-4 mg/L.
Preferably, in the step (3.4), the sewage is precipitated from bottom to top through the inclined tube of the precipitation tank and then discharged from the water production pipe to the outside.
Preferably, when the carbon source and the influent carbon source are insufficient, a medicament is added into the reaction tank, and the medicament is glucose.
Compared with the prior art, the invention has the following technical effects:
(1) according to the invention, the continuous water outlet pipe and the intermittent water outlet pipe are arranged in the traditional SBR process system, the intermittent operation mode or the continuous operation mode can be correspondingly switched according to the change of the sewage quantity, the SBR process is adopted for intermittent operation when the quantity of the sewage to be treated is less, the operation cost can be reduced, and the continuous operation mode is adopted when the quantity of the sewage to be treated is large, so that the sewage treatment efficiency can be improved, the change of the sewage quantity can be better adapted, and the SBR process system is suitable for distributed domestic sewage treatment;
(2) the invention adopts a continuous operation mode when the sewage quantity is larger, can reduce the volume of the adjusting tank in front of the reaction tank, further can reduce the construction investment, and is better suitable for the requirement of distributed sewage treatment in rural areas;
(3) the inclined sedimentation tank pipe is arranged in the sedimentation tank, and sewage in continuous operation flows out through the water production pipe after being precipitated by the inclined sedimentation tank pipe, so that the treatment effect on the sewage in continuous operation, particularly when sludge flows back, can be improved, and the efficiency in intermittent operation can be ensured without passing through the inclined sedimentation tank pipe, so that the invention can be better suitable for different treatment modes, and the effect or the efficiency of sewage treatment can be ensured or improved;
(4) the reaction tank is divided into a plurality of grids which are communicated with each other and form an S-shaped circulation path, on one hand, an anoxic tank and an aerobic tank can be respectively formed by opening and closing the aeration device and are used as unused process units to treat different pollution sources, on the other hand, water flow can be guided to form an S-shaped flow mode, the mixing degree of sewage in the reaction tank is improved, and the treatment effect is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic top view of the system of the present invention;
FIG. 3 is a side cross-sectional structural view of FIG. 2;
wherein, 1, a water inlet pipe; 2. a reaction tank; 3. a sedimentation tank; 4. a water production pipe; 5. an aeration device; 6. an aeration pipe; 7. a blower; 8. an electric cabinet; 9. a dosing device; 10. decanting device; 11. continuously discharging water; 12. intermittent water outlet pipes; 13. filtering cloth; 14. an inclined tube of the sedimentation tank; 15. a sludge return pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a system and a method suitable for distributed domestic sewage treatment, which are used for solving the problems in the prior art, and the system is provided with a continuous water outlet pipe and an intermittent water outlet pipe in the traditional SBR process system which intermittently operates, and can be correspondingly switched into an intermittent operation mode or a continuous operation mode according to the change of sewage quantity, so that the system can better adapt to the change of the sewage quantity and is suitable for the distributed domestic sewage treatment.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a system suitable for distributed domestic sewage treatment, which comprises a water inlet pipe 1, a reaction tank 2, a sedimentation tank 3 and a water production pipe 4 which are sequentially communicated, wherein the water inlet pipe 1 can be communicated with a raw water pump and is used for delivering sewage into the reaction tank 2, and an adjusting tank can be arranged in front of the water inlet pipe 1 and is used for temporarily storing sewage and adjusting the amount of the sewage entering the reaction tank 2 according to the amount of the sewage to be treated, as shown in figures 2-3. For example, the amount of sewage to be treated is increased by accident due to the influence of precipitation and the like, and the sewage can be temporarily stored in a regulating tank and an intermittent operation mode is adopted; when the sewage quantity is continuously increased due to factors such as continuous precipitation and the like, the regulating reservoir is limited in volume and can not meet the requirement of regulating the water quantity any more, and a continuous operation mode can be started. Therefore, the invention adopts a mode of switching between continuous operation and intermittent operation, can reduce the dependence on the volume of the regulating reservoir, thereby building a regulating reservoir with smaller volume and reducing the engineering investment and cost. The system also comprises an electric control box 8 for automatically or manually controlling the operation of each device in the system. The reaction tank 2 is divided into at least two grids, each grid is internally provided with an aeration device 5, the aeration device 5 can be an aeration disc or an aeration pipe, the aeration device 5 is communicated with a blower 7 through the aeration pipe 6, the blower 7 provides a gas source for the aeration device 5, the aeration device 5 in each grid can be independently opened and closed, the process can be realized by arranging an on-off valve on the aeration pipe 6, and the valve can be an electromagnetic valve and can be remotely controlled or automatically controlled. In the intermittent operation, the aeration devices 5 of each cell may be turned on to enable the treatment process of SBR (sequencing batch reactor), and in the continuous operation, the aeration device 5 of the first cell may be turned off and the aeration devices 5 of the other cells may be turned on to enable the anoxic environment to be formed in the first cell and the aerobic environment to be formed in the other cells, thereby realizing the demand for the sewage treatment in the continuous operation state. An intermittent water outlet pipe 12 with an on-off valve and a continuous water outlet pipe 11 are communicated between the reaction tank 2 and the sedimentation tank 3, and the on-off valve can be an electric valve or a manual valve; when the system is in intermittent operation, the valve of the intermittent water outlet pipe 12 is opened (at the moment, the valve of the continuous water outlet pipe 11 is closed), so that sewage enters the sedimentation tank 3 from the reaction tank 2 through the intermittent water outlet pipe 12, and when the system is in continuous operation, the valve of the continuous water outlet pipe 11 is opened (at the moment, the valve of the intermittent water outlet pipe 12 is closed), so that sewage enters the sedimentation tank 3 from the reaction tank 2 through the continuous water outlet pipe 11. It should be noted that the communication positions of the intermittent water outlet pipe 12 and the continuous water outlet pipe 11 on the sedimentation tank 3 are different in vertical height, specifically, a sedimentation tank inclined pipe 14 is arranged in the sedimentation tank 3, the intermittent water outlet pipe 12 is arranged at the upper part of the sedimentation tank inclined pipe 14, and the continuous water outlet pipe 11 is arranged at the lower part of the sedimentation tank inclined pipe 14; in addition, the water production pipe 4 is arranged at the upper part of the inclined pipe 14 of the sedimentation tank, so that when the system of the invention is continuously operated, sewage is precipitated by the inclined pipe 14 of the sedimentation tank and then flows out through the water production pipe 4, thereby improving the treatment effect on the sewage when the system is continuously operated, particularly when sludge reflows; when the device is operated intermittently, sewage does not need to pass through the inclined pipe 14 of the sedimentation tank, and the efficiency of the intermittent operation can be ensured, so that the device can be better suitable for different treatment modes, and the effect or the efficiency of sewage treatment can be ensured or improved. Therefore, the invention arranges the continuous water outlet pipe 11 and the intermittent water outlet pipe 12 in the traditional SBR process system, can be switched into an intermittent operation mode or a continuous operation mode according to the change of the sewage quantity, can adopt the SBR process to perform intermittent operation when the quantity of the sewage to be treated is less, can reduce the operation cost, can adopt the continuous operation mode when the quantity of the sewage to be treated is large, can improve the treatment efficiency of the sewage, thereby being capable of better adapting to the change of the sewage quantity and being suitable for the distributed domestic sewage treatment.
The reaction tank 2 can be divided into four mutually communicated grids which can be separated by baffles, and the positions of the baffles are not unique, so that the size of each grid can be adjusted according to the actual technical process and conditions, namely, the sizes of the grids can be equal or different. It should be noted that, two adjacent grids can be communicated at the top after the baffle is arranged, and also can be communicated at the bottom, in order to further achieve the effect of treating sewage, the communicated positions can also be arranged at intervals, for example, the first grid and the second grid are communicated at the bottom, the second grid and the third grid are communicated at the top, further, the third grid and the fourth grid are communicated at the bottom again, of course, the communication sequence from the first grid to the fourth grid can also be such that the sewage forms an S-shaped circulation path in the reaction tank 2 by any communication mode, first the top, then the bottom and then the top. On the one hand, each check form the reaction tank 2 of incomplete intercommunication, can form oxygen deficiency pond and aerobic tank respectively through opening and closing aeration equipment 5, handle different pollution sources, and on the other hand can carry out the water conservancy diversion to rivers, forms the mobile mode of S type, improves the mixed degree of sewage in reaction tank 2 to further improvement treatment effect.
A sludge return pipe 15 can be arranged between the sedimentation tank 3 and the reaction tank 2, the sludge return pipe 15 is used for returning the sludge in the sedimentation tank 3 into the reaction tank 2, a return pump can be installed on the sludge return pipe 15 and is used for driving the return of the sludge, it should be noted that the sludge return pipe 15 is communicated with the first grid of the reaction tank 2, that is, the returned sludge can flow to other grids through the first grid in the reaction tank 2; the sludge can provide favorable environment for the growth of microorganisms, and is favorable for the propagation of the microorganisms and nitrifying bacteria under aerobic environment, so that the pollution of organic matters such as carbon, ammonia nitrogen and the like in the sewage can be degraded or adsorbed.
A decanter 10 can be arranged between the reaction tank 2 and the intermittent water outlet pipe 12 and the continuous water outlet pipe 11, and the decanter 10 can be arranged in the reaction tank 2, that is, the intermittent water outlet pipe 12 and the continuous water outlet pipe 11 are arranged on an outlet of the decanter 10 in parallel, so that the sewage in the reaction tank 2 passes through the decanter 10 and then enters the intermittent water outlet pipe 12 or the continuous water outlet pipe 11. The decanter 10 may be classified into a siphon type, a rotary type, a self-floating type, a mechanical type, etc., and belongs to the existing equipment, and the decanter 10 is generally equipment for periodically removing clarified water in the SBR process, and has the functions of decanting the clarified water from the surface of the static reaction tank 2 without stirring and settling, and ensuring the quality of the discharged water in intermittent operation. According to the invention, the decanter 10 is arranged on the decanter 10 in parallel, and the device can be applied in intermittent operation and continuous operation, so that the amount of sludge entering the sedimentation tank 3 can be reduced in continuous operation, and the effluent quality of the sedimentation tank 3 is ensured.
The filter cloth 13 can be arranged between the sedimentation tank 3 and the water production pipe 4, the filter cloth 13 can be arranged inside the sedimentation tank 3, the sewage after sedimentation is filtered by the filter cloth 13 and then flows out of the water production pipe 4, and the sewage can be filtered again before water production, so that the water production quality is further improved.
The device can also be provided with a drug adding device 9, the drug adding device 9 respectively adds drugs to the front end and the rear end of the reaction tank 2, the added drugs comprise glucose and PAC polyaluminium chloride, and the amount of the added drugs is adjusted according to the amount of water actually treated. Wherein, the glucose is mainly added at the front end of the reaction tank 2 and is used for providing a carbon source for denitrifying bacteria, and is added when the carbon source and the carbon source of inlet water are insufficient; PAC polyaluminium chloride is mainly added at the front end of the reaction tank 2 (or at the rear end of the reaction tank 2) for removing phosphorus, and is added according to the content of total phosphorus in inlet water and the effluent standard. The final product water may also be supplemented with sodium hypochlorite for disinfection.
The invention also provides a method suitable for decentralized domestic sewage treatment, as shown in fig. 1 and in conjunction with fig. 2-3, in which the aforementioned decentralized domestic sewage treatment system can be applied, comprising the following steps:
(1) setting a sewage quantity threshold value, wherein the sewage quantity threshold value is set according to the treatment capacity of the actually constructed equipment, and the treatment capacity needs to be determined by investigation and analysis according to the requirement of the actually constructed place; for example, the system in a certain area sets a threshold value of sewage amount to be 100 tons/day, and when the amount of sewage to be treated is smaller than the threshold value, the intermittent operation mode is selected, and when the amount of sewage to be treated exceeds the threshold value (for example, 110 tons/day), the continuous operation mode is selected. For how to monitor the sewage quantity, a flow monitoring device can be arranged at the inlet side of the system (if an adjusting tank is arranged, the sewage quantity can also be fed back according to the change of the liquid level of the adjusting tank), and when the monitored sewage quantity exceeds or is lower than a sewage quantity threshold value, the operation mode of the system can be manually converted, and the intermittent operation mode is converted into the continuous operation mode, or the continuous operation mode is converted into the intermittent operation mode; of course, the signal of the sewage amount can be transmitted to the automatic control device, so as to transmit the switch signal to the electromagnetic valve on the continuous water outlet pipe 11 or the intermittent water outlet pipe 12, thereby realizing automatic control.
(2) When selecting intermittent type operation mode, can be SBR mode this moment, under this operation mode, intake, reaction, deposit, go out water, standby etc. and all go on in reaction tank 2, specific:
(2.1) sewage enters a reaction tank 2 through a water inlet pipe 1, and water inlet is stopped when the sewage reaches a designed liquid level, wherein the designed liquid level is the optimal water level of the system in intermittent operation, and the design and determination can be carried out according to the treatment capacity of the system at the initial stage of system design;
(2.2) starting the aeration devices 5 to carry out aeration reaction, and if the reaction tank 2 is divided into a plurality of grids, starting the aeration devices 5 of each grid;
(2.3) after reacting for a period of time, detecting whether each treatment data in the sewage reaches a treatment target, if so, stopping the aeration reaction, if not, continuing the aeration reaction until the treatment target is reached, and then entering a precipitation stage;
(2.4) after the water quality meets the requirement, ending the sedimentation stage, and opening a valve of the continuous water outlet pipe 11 to ensure that the sewage enters the sedimentation tank 3 and is discharged out of the produced water through the produced water pipe 4.
(3) When a continuous operation mode is selected, an anoxic, aerobic and inclined tube precipitation mode can be adopted, the water flow direction of the reaction tank 2 is the same as that of the intermittent operation mode, and the water flows continuously only:
(3.1) the reaction tank 2 is divided into a plurality of grids, the aeration device 5 of the first grid is closed, an electromagnetic valve system can be arranged to automatically start and stop according to the switching process, and the dissolved oxygen is controlled within a certain range to be used as an anoxic tank; sewage is fed from beginning to endThe water pipe 1 continuously enters the first grid, and simultaneously, the sludge in the sedimentation tank 3 also flows back to enter the first grid; the first function of the anoxic tank is denitrification, and the denitrifying bacteria utilize organic matters in the sewage as carbon source to carry NO into the returned sludge in the sedimentation tank 33 -And NO2 -Reduction to N2And released into the air, the BOD concentration continues to decrease, NO3 -The concentration is also greatly reduced;
(3.2) opening the aeration devices 5 of other grids of the reaction tank 2, automatically starting and stopping the system according to a switching process by setting an electromagnetic valve system, and controlling the dissolved oxygen within a certain range to serve as an aerobic tank; the sewage continuously enters from the first grid and flows through other grids in sequence, and under the aeration state, microorganisms and nitrifying bacteria mass propagated in the activated sludge can degrade or adsorb organic pollutants containing carbon, ammonia nitrogen and the like in the water, so that the aim of purifying the water quality is fulfilled; the aeration device 5 can adopt a tubular rubber microporous aerator, and has good oxygen transfer rate;
(3.3) gradually increasing the amount of the sewage entering the reaction tank 2, gradually increasing the liquid level of the sewage in the reaction tank 2, and opening the valve of the continuous water outlet pipe 11 when the liquid level reaches a set liquid level so that the sewage enters the sedimentation tank 3 for sedimentation;
(3.4) the sewage precipitated in the sedimentation tank 3 is discharged from the water production pipe 4 to the outside, and the filter cloth 13 can be arranged before the water production pipe 4 so as to be filtered again before water production, thereby further improving the treatment effect of the sewage.
The dissolved oxygen in the anoxic tank in the step (3.1) can be controlled to be 0.2-0.5mg/L, and the dissolved oxygen in the aerobic tank in the step (3.2) can be controlled to be 2-4 mg/L.
In the step (3.4), a sedimentation tank inclined pipe 14 can be arranged in the sedimentation tank 3, a continuous water outlet pipe 11 is arranged at the lower part of the sedimentation tank inclined pipe 14, and a water production pipe 4 is arranged at the upper part of the sedimentation tank inclined pipe 14, so that in continuous operation, sewage is precipitated by the sedimentation tank inclined pipe 14 and then flows out through the water production pipe 4, and the treatment effect on the sewage in continuous operation, particularly when sludge reflows, can be improved.
If the carbon source and the influent carbon source in the reaction tank 2 are insufficient, adding a medicament into the reaction tank 2, wherein the medicament is glucose, and the addition amount of the glucose is added according to actual requirements and is mainly added at the front end of the reaction tank 2; in addition, PAC polyaluminium chloride can be added into the reaction tank 2 for dephosphorization, and the PAC polyaluminium chloride is added according to the content of total phosphorus in inlet water and the effluent standard, and is mainly added at the front end of the reaction tank 2 (or at the rear end of the reaction tank 2).
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The utility model provides a system suitable for distributed domestic sewage handles which characterized in that: comprises a water inlet pipe, a reaction tank, a sedimentation tank and a water production pipe which are sequentially communicated; an intermittent water outlet pipe with an on-off valve and a continuous water outlet pipe are communicated between the reaction tank and the sedimentation tank; a sedimentation tank inclined pipe is arranged in the sedimentation tank, the water production pipe and the intermittent water outlet pipe are arranged at the upper part of the sedimentation tank inclined pipe, and the continuous water outlet pipe is arranged at the lower part of the sedimentation tank inclined pipe; the reaction tank is at least divided into two grids, an aeration device is arranged in each grid, and the aeration device in each grid can be independently opened and closed.
2. The system for decentralized domestic sewage treatment according to claim 1, wherein: the reaction tank is divided into four grids, and the two adjacent grids are communicated at the bottom or the top to form an S-shaped circulation path of the sewage.
3. The system for decentralized domestic sewage treatment according to claim 2, wherein: and a sludge return pipe is arranged between the sedimentation tank and the reaction tank.
4. A system for decentralized domestic sewage treatment according to any one of claims 1-3, wherein: a decanter is arranged between the reaction tank and the intermittent water outlet pipe and between the reaction tank and the continuous water outlet pipe, and sewage flows out of the reaction tank, passes through the decanter and then enters the intermittent water outlet pipe or the continuous water outlet pipe.
5. System for decentralized domestic sewage treatment according to claim 4, characterized in that: and a filter cloth is arranged between the sedimentation tank and the water production pipe, and sewage flows out of the water production pipe after being filtered by the filter cloth.
6. System for decentralized domestic sewage treatment according to claim 4, characterized in that: comprises a medicine adding device, wherein the medicine added by the medicine adding device comprises glucose and PAC polyaluminium chloride.
7. The method for treating the distributed domestic sewage is characterized by comprising the following steps of:
(1) setting a sewage quantity threshold value, selecting an intermittent operation mode when the sewage quantity to be processed is smaller than the sewage quantity threshold value, and selecting a continuous operation mode when the sewage quantity to be processed exceeds the sewage quantity threshold value;
(2) when the intermittent operation mode is selected:
(2.1) sewage enters the reaction tank through the water inlet pipe, and water inlet is stopped when the sewage reaches a designed liquid level;
(2.2) carrying out aeration reaction;
(2.3) stopping the aeration reaction and entering a precipitation stage;
(2.4) discharging the produced water outwards through a water production pipe after the precipitation stage is finished;
(3) when the continuous operation mode is selected:
(3.1) closing the aeration device of the first grid to serve as an anoxic pond; the sewage continuously enters the first grid through the water inlet pipe, and simultaneously, the sludge in the sedimentation tank also flows back to enter the first grid;
(3.2) opening the aeration devices of other grids to serve as aerobic tanks; sewage continuously enters from the first grid and flows through other grids in sequence;
(3.3) when the liquid level of the sewage in the reaction tank reaches a set liquid level, allowing the sewage to enter a sedimentation tank for sedimentation;
and (3.4) discharging the precipitated sewage from the water production pipe to the produced water.
8. The method for decentralized domestic sewage treatment according to claim 7, characterized in that: the dissolved oxygen of the anoxic tank in the step (3.1) is controlled to be 0.2-0.5mg/L, and the dissolved oxygen of the aerobic tank in the step (3.2) is controlled to be 2-4 mg/L.
9. The method for decentralized domestic sewage treatment according to claim 7, characterized in that: and (3.4) precipitating the sewage from bottom to top through the inclined tube of the precipitation tank, and discharging the produced water from the water production pipe to the outside.
10. The method for decentralized domestic sewage treatment according to claim 7, characterized in that: when the carbon source and the influent carbon source are insufficient, adding a medicament into the reaction tank, wherein the medicament is glucose.
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