CN114956313A - Sewage treatment method - Google Patents
Sewage treatment method Download PDFInfo
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- CN114956313A CN114956313A CN202210499598.8A CN202210499598A CN114956313A CN 114956313 A CN114956313 A CN 114956313A CN 202210499598 A CN202210499598 A CN 202210499598A CN 114956313 A CN114956313 A CN 114956313A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a sewage treatment method, which adopts a sewage treatment system to treat sewage, wherein the sewage treatment system comprises a treatment tank, a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank; the water inlet system comprises a first water inlet pipe, a second water inlet pipe, a third water inlet pipe and a fourth water inlet pipe; the water outlet system comprises a first water outlet pipe, a second water outlet pipe, a third water outlet pipe and a fourth water outlet pipe, and the water outlet pipes are connected with corresponding water outlet grooves; an aeration system; the four tanks are continuously and circularly operated, the circular operation mode of water inlet, aeration, sedimentation and water outlet is realized for each tank through the adjustment of water inlet, water outlet and aeration, the whole treatment system can be continuously operated at a constant water level, a good habitat is created for the generation and continuous and stable operation of granular sludge, the operation stability of the whole system is good, and the pollutant removal efficiency is high.
Description
Technical Field
The invention is used in the technical field of sewage treatment, and particularly relates to a sewage treatment method.
Background
The activated sludge process and its improved process are the most widely used method for biological sewage treatment, and the sewage purification is realized by utilizing the self-reproduction and growth of various microbes growing in activated sludge flocs. Activated sludge is composed of a diverse population of microorganisms with attached inorganic and organic materials in which various bacteria, fungi, protozoa and small numbers of metazoan grow. The traditional activated sludge method has the defects of loose structure, poor settleability, high content of suspended matters in effluent, weak impact load resistance, large amount of residual sludge and difficult treatment.
The activated sludge granulation is to carry out directional culture on the traditional activated sludge to finally form an activated sludge system which takes the granular sludge with larger particle size and compact structure as the main part and has a small amount of flocs. Compared with the traditional activated sludge, the granular sludge has a relatively compact structure and excellent sedimentation performance, and the microenvironment caused by the structure of the granular sludge is more favorable for the growth of high-efficiency nitrogen and phosphorus removal bacteria, so that the treatment efficiency of the sewage treatment system is improved, the sewage treatment with low cost and high efficiency is realized, and the granular sludge is a great breakthrough in the field of sewage biological treatment. Therefore, activated sludge granulation has been a hotspot of research in the field of biological sewage treatment since the discovery; however, how to effectively control and realize granulation of activated sludge and how to stably maintain the activated sludge for a long time are also main problems which need to be solved at present.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art, and provides a sewage treatment method, wherein four pools are adopted for continuous circulating operation, the circulating operation mode of 'water inlet-aeration-intermittent-water outlet' is realized for each pool through the adjustment of water inlet, water outlet and aeration, the whole treatment system can be operated at a continuous constant water level, the operation condition creates a good habitat for the generation and continuous and stable operation of granular sludge, and the whole system has good operation stability and high pollutant removal efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method of treating wastewater with a wastewater treatment system, the wastewater treatment system comprising:
the treatment tank comprises a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank, wherein a first water outlet tank is arranged at the top of the first treatment tank, a first communicating pipe leading into the second treatment tank is arranged in the first water outlet tank, a second water outlet tank is arranged at the top of the second treatment tank, a second communicating pipe leading into the third treatment tank is arranged in the second water outlet tank, a third water outlet tank is arranged at the top of the third treatment tank, a third communicating pipe leading into the fourth treatment tank is arranged in the third water outlet tank, a fourth water outlet tank is arranged at the top of the fourth treatment tank, and a fourth communicating pipe leading into the first treatment tank is arranged in the fourth water outlet tank;
the water inlet system comprises a first water inlet pipe connected into the first treatment tank, a second water inlet pipe connected into the second treatment tank, a third water inlet pipe connected into the third treatment tank and a fourth water inlet pipe connected into the fourth treatment tank;
the water outlet system comprises a first water outlet pipe connected with the first water outlet tank, a second water outlet pipe connected with the second water outlet tank, a third water outlet pipe connected with the third water outlet tank and a fourth water outlet pipe connected with the fourth water outlet tank;
the aeration system comprises a first aeration component arranged at the bottom of the first treatment tank, a second aeration component arranged at the bottom of the second treatment tank, a third aeration component arranged at the bottom of the third treatment tank and a fourth aeration component arranged at the bottom of the fourth treatment tank;
the sewage treatment method comprises the following steps:
and in the T period, the first water inlet pipe and the fourth water outlet pipe are opened, the water flow sequence is a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank, and the operation working conditions of the treatment tanks are as follows: the first treatment tank A is fed with water, aeration is started in the time period of 0.5-1T, the second treatment tank B is aerated, aeration is started in the time period of 0-0.5T in the third treatment tank C, and water is discharged from the fourth treatment tank D;
in the 2T period, a fourth water inlet pipe and a third water outlet pipe are opened, the water flow is sequentially from a fourth treatment pool, a first treatment pool, a second treatment pool and a third treatment pool, and the operation conditions of the treatment pools are as follows: the fourth treatment tank is filled with water, aeration and the first treatment tank are started at the time interval of 0.5-1T, aeration and the second treatment tank are started at the time interval of 0-0.5T, and water is discharged from the third treatment tank;
and in the 3T period, a third water inlet pipe and a second water inlet pipe are opened, the water flow sequence is a third treatment pool, a fourth treatment pool, a first treatment pool and a second treatment pool, and the operation conditions of the treatment pools are as follows: the third treatment tank is used for feeding water, the aeration and the fourth treatment tank are started in the 0.5-1T period, the aeration and the second treatment tank are started in the 0-0.5T period;
and in the 4T period, a second water inlet pipe and a first water outlet pipe are opened, the water flow sequence is a second treatment tank, a third treatment tank, a fourth treatment tank and a first treatment tank, and the operation working conditions of the treatment tanks are as follows: the second treatment tank is used for feeding water, the aeration and the third treatment tank are started at the time interval of 0.5-1T, the aeration and the first treatment tank A are started at the time interval of 0-0.5T in the fourth treatment tank;
one operation cycle is formed from the T-th period to the 4T-th period, and is circulated.
In some embodiments, the first water inlet pipe extends to the bottom of the first treatment tank and is connected with a first water distribution assembly at the bottom of the first treatment tank, the second water inlet pipe extends to the bottom of the second treatment tank and is connected with a second water distribution assembly at the bottom of the second treatment tank, the third water inlet pipe extends to the bottom of the third treatment tank and is connected with a third water distribution assembly at the bottom of the third treatment tank, and the fourth water inlet pipe extends to the bottom of the fourth treatment tank and is connected with a fourth water distribution assembly at the bottom of the fourth treatment tank.
In some embodiments, the first communicating pipe is arranged at the lowest part of the first water outlet groove, extends to the bottom of the first treating tank and is connected with a first check valve, and penetrates through the tank walls of the first treating tank and the second treating tank to be connected with the second water distribution assembly of the second treating tank; the lowest part of the second water outlet groove is provided with the second communicating pipe, the second communicating pipe extends to the bottom of the second treatment tank and is connected with a second check valve, and the second communicating pipe penetrates through the second treatment tank and the tank wall of the third treatment tank and is connected with the third water distribution assembly of the third treatment tank; the lowest part of the third water outlet tank is provided with the third communicating pipe, the third communicating pipe extends to the bottom of the third treatment tank and is connected with a third check valve, and the third communicating pipe penetrates through the tank walls of the third treatment tank and the fourth treatment tank and is connected with the fourth water distribution assembly of the fourth treatment tank; the fourth water outlet tank is arranged at the lowest position of the fourth water outlet tank, the fourth communicating pipe extends to the bottom of the fourth treatment tank and is connected with a fourth check valve, and the fourth communicating pipe penetrates through the fourth treatment tank and the tank wall of the first treatment tank and is connected with the first water distribution assembly of the first treatment tank.
In some embodiments, the water inlet system comprises a water inlet manifold, the water inlet manifold is connected with the first water inlet pipe, the second water inlet pipe, the third water inlet pipe and the fourth water inlet pipe, the first water inlet pipe is provided with a first water inlet valve, the second water inlet pipe is provided with a second water inlet valve, the third water inlet pipe is provided with a third water inlet valve, the fourth water inlet pipe is provided with a fourth water inlet valve, the water inlet manifold continuously supplies water at a constant flow, and in a T period, the first water inlet valve is opened, and the second water inlet valve, the third water inlet valve and the fourth water inlet valve are closed; during the 2T period, the fourth water inlet valve is opened, and the first water inlet valve, the second water inlet valve and the third water inlet valve are closed; during the 3T period, the third water inlet valve is opened, and the fourth water inlet valve, the first water inlet valve and the second water inlet valve are closed; and in the 4T period, the second water inlet valve is opened, and the third water inlet valve, the fourth water inlet valve and the first water inlet valve are closed.
In some embodiments, the water outlet system comprises a water outlet header pipe, the first water outlet pipe, the second water outlet pipe, the third water outlet pipe and the fourth water outlet pipe are merged into the water outlet header pipe, the first water outlet pipe is provided with a first water outlet valve, the second water outlet pipe is provided with a second water outlet valve, the third water outlet pipe is provided with a third water outlet valve, the fourth water outlet pipe is provided with a fourth water outlet valve, the fourth water outlet valve is opened in a T period, and the first water outlet valve, the second water outlet valve and the third water outlet valve are closed; in the 2T period, the third water outlet valve is opened, and the first water outlet valve, the second water outlet valve and the fourth water outlet valve are closed; in a 3T period, the second water outlet valve is opened, and the first water outlet valve, the third water outlet valve and the fourth water outlet valve are closed; in the 4T period, the first water outlet valve is opened, the fourth water outlet valve, the second water outlet valve and the third water outlet valve are closed, and the water outlet main pipe continuously discharges water at a constant flow.
In some embodiments, the aeration system comprises an air compressor and an aeration main pipe, the first aeration component is connected to the aeration main pipe through a first aeration valve, the second aeration component is connected to the aeration main pipe through a second aeration valve, the third aeration component is connected to the aeration main pipe through a third aeration valve, the fourth aeration component is connected to the aeration main pipe through a fourth aeration valve, the aeration main pipe conducts constant-current continuous aeration, the Tth period is that the second aeration valve is opened, the first aeration valve is opened in the 0.5-1T period, the third aeration valve is opened in the 0-0.5T period, and the fourth aeration valve is closed; in the 2T period, the first aeration valve is opened, the fourth aeration valve is opened in the 0.5-1T period, the second aeration valve is opened in the 0-0.5T period, and the third aeration valve is closed; in the 3T period, the fourth aeration valve is opened, the third aeration valve is opened in the 0.5-1T period, the first aeration valve is opened in the 0-0.5T period, and the second aeration valve is closed; and in the 4T period, the third aeration valve is opened, the second aeration valve is opened in the 0.5-1T period, the fourth aeration valve is opened in the 0-0.5T period, and the first aeration valve is closed.
In some embodiments, the first water outlet tank, the second water outlet tank, the third water outlet tank and the fourth water outlet tank are respectively provided with an aeration mixing device, and the aeration mixing devices are connected with the air compressor through an aeration pipeline provided with a mixing air valve.
In some embodiments, the first, second, third and fourth exit channels are provided with mechanical mixing devices therein.
In some embodiments, the treatment tank includes a main tank body, the main tank body is provided with a partition wall therein, and is divided into a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank by the partition wall, and the first treatment tank, the second treatment tank, the third treatment tank and the fourth treatment tank are sequentially distributed along the circumferential direction of the main tank body.
In some embodiments, the first treatment tank, the second treatment tank, the third treatment tank, and the fourth treatment tank are separate tank bodies, the first treatment tank is adjacent to the second treatment tank, the second treatment tank is adjacent to the third treatment tank, the third treatment tank is adjacent to the fourth treatment tank, and the fourth treatment tank is adjacent to the fourth treatment tank.
One of the above technical solutions has at least one of the following advantages or beneficial effects: the technical scheme of the invention abandons the plug-flow type operation mode of the activated sludge mixed liquid in the prior art, and adopts four-pool continuous circulation operation instead, namely, the circulation operation mode of 'water inlet-aeration-sedimentation-water outlet' is realized for each pool through the adjustment of water inlet, water outlet and aeration of each treatment pool, and the whole treatment system can be operated at a continuous constant water level, the operation condition realizes that the activated sludge does not flow among different treatment pools along with water flow and mud and water are shunted, the adverse effect of the shearing force generated by the flowing of the mixed liquid on the granular sludge is overcome, in addition, the invention does not need mixed liquid backflow and sludge backflow, and further reduces the disturbance of waterpower, thereby creating a good habitat for the generation and continuous and stable operation of the granular sludge in each treatment pool, and realizing the high-efficiency activity of the granular sludge formed in each treatment pool, the whole treatment system has good operation stability and greatly improves the pollutant removal efficiency.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of an embodiment of a sewage treatment system of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of the present invention in which a main tank body is divided into a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank by a partition wall;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention in which four independent circular tank bodies are formed into a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank;
FIG. 4 is a schematic structural diagram of an embodiment of the present invention in which four independent polygonal tank bodies are formed into a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank;
FIG. 5 is a schematic view of the arrangement of a mud valve and a sink in accordance with the present invention;
FIGS. 6-9 are schematic views showing the operation of the first, second, third and fourth treatment pools during one operation cycle of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.
In the invention, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.
An embodiment of the present invention provides a sewage treatment method, which uses a sewage treatment system to treat sewage, and referring to fig. 1, the sewage treatment system comprises a treatment tank, a water inlet system, a water outlet system and an aeration system.
Specifically, referring to fig. 1, the treatment tank includes a first treatment tank a, a second treatment tank B, a third treatment tank C and a fourth treatment tank D, the top of the first treatment tank a is provided with a first water outlet tank 4a, the top of the second treatment tank B is provided with a second water outlet tank 4B, the top of the third treatment tank C is provided with a third water outlet tank 4C, the top of the fourth treatment tank D is provided with a fourth water outlet tank 4D, and each treatment tank realizes top water outlet through the water outlet tank arranged at the top. The first effluent tank 4a is provided with a first communicating pipe 5ab leading into the second treatment tank B, the first communicating pipe 5ab is provided with a first check valve 6ab, the second effluent tank 4B is provided with a second communicating pipe 5bc leading into the third treatment tank C, the second communicating pipe 5bc is provided with a second check valve 6bc, the third effluent tank 4C is provided with a third communicating pipe 5cd leading into the fourth treatment tank D, the third communicating pipe 5cd is provided with a third check valve 6cd, the fourth effluent tank 4D is provided with a fourth communicating pipe 5da leading into the first treatment tank A, and the fourth communicating pipe 5da is provided with a fourth check valve 6 da. The first treatment pool A, the second treatment pool B, the third treatment pool C and the fourth treatment pool D are communicated in sequence through communicating pipes.
Referring to fig. 1, the water inlet system is used for independently distributing water to each treatment tank according to a treatment process, and includes a first water inlet pipe 1a connected to a first treatment tank a, a second water inlet pipe 1B connected to a second treatment tank B, a third water inlet pipe 1C connected to a third treatment tank C, and a fourth water inlet pipe 1D connected to a fourth treatment tank D.
Referring to fig. 1, the water outlet system is used for discharging the treated water out of the treatment tank according to the treatment process, and includes a first water outlet pipe, a second water outlet pipe, a third water outlet pipe and a fourth water outlet pipe, the first water outlet pipe is connected to the first water outlet tank 4a and provided with a first water outlet valve 11a, the second water outlet pipe is connected to the second water outlet tank 4b and provided with a second water outlet valve 11b, the third water outlet pipe is connected to the third water outlet tank 4c and provided with a third water outlet valve 11c, and the fourth water outlet pipe is connected to the fourth water outlet tank 4d and provided with a fourth water outlet valve 11 d.
Referring to fig. 1, the aeration system is used for independently aerating each treatment tank according to the treatment progress, and comprises a first aeration assembly 8a arranged at the bottom of the first treatment tank a, a second aeration assembly 8B arranged at the bottom of the second treatment tank B, a third aeration assembly 8C arranged at the bottom of the third treatment tank C, and a fourth aeration assembly 8D arranged at the bottom of the fourth treatment tank D.
With reference to fig. 1 and table 1, the sewage treatment method comprises the following steps:
in the T period, the first water inlet pipe 1a and the fourth water outlet pipe are opened, the water flow sequence is a first treatment pool A, a second treatment pool B, a third treatment pool C and a fourth treatment pool D, and the operation conditions of the treatment pools are as follows: the first treatment tank A is fed with water, aeration is started in the time period of 0.5-1T, the second treatment tank B is aerated, aeration is started in the time period of 0-0.5T in the third treatment tank C, and water is discharged from the fourth treatment tank D;
in the 2T period, the fourth water inlet pipe 1D and the third water outlet pipe are opened, the fourth treatment tank D-the first treatment tank A-the second treatment tank B-the third treatment tank C are arranged in the water flow sequence, and the operation conditions of the treatment tanks are as follows: the fourth treatment tank D feeds water, and starts aeration at the time interval of 0.5-1T, the first treatment tank A aerates, the second treatment tank B starts aeration at the time interval of 0-0.5T, and the third treatment tank C discharges water;
and in the 3T period, the third water inlet pipe 1C and the second water inlet pipe are opened, the water flow sequence is a third treatment pool C-a fourth treatment pool D-a first treatment pool A-a second treatment pool B, and the operation conditions of the treatment pools are as follows: the third treatment tank C feeds water, the aeration is started in the period of 0.5-1T, the aeration is started in the fourth treatment tank D, the aeration is started in the first treatment tank A in the period of 0-0.5T, and the water is discharged from the second treatment tank B;
and in the 4T period, the second water inlet pipe 1B and the first water outlet pipe are opened, the water flow sequence is that the second treatment tank B, the third treatment tank C, the fourth treatment tank D and the first treatment tank A are arranged, and the operation working conditions of the treatment tanks are as follows: the second treatment tank B is used for feeding water, the aeration is started in the period of 0.5-1T, the aeration is started in the third treatment tank C, the aeration is started in the fourth treatment tank D in the period of 0-0.5T, and the water is discharged from the first treatment tank AA;
one operation cycle is formed from the T-th period to the 4T-th period, and is circulated.
TABLE 1 operating conditions of the treatment cells in an operating cycle
The technical scheme of the invention abandons the plug-flow type operation mode of the activated sludge mixed liquid in the prior art, and adopts four-pool continuous circulation operation instead, namely, the circulation operation mode of 'water inlet-aeration-sedimentation-water outlet' is realized for each pool through the adjustment of water inlet, water outlet and aeration of each treatment pool, and the whole treatment system can be operated at a continuous constant water level, the operation condition realizes that the activated sludge does not flow among different treatment pools along with water flow and mud and water are shunted, the adverse effect of the shearing force generated by the flowing of the mixed liquid on the granular sludge is overcome, in addition, the invention does not need mixed liquid backflow and sludge backflow, and further reduces the disturbance of waterpower, thereby creating a good habitat for the generation and continuous and stable operation of the granular sludge in each treatment pool, and realizing the high-efficiency activity of the granular sludge formed in each treatment pool, the whole treatment system has good operation stability and greatly improves the pollutant removal efficiency.
In some embodiments, in order to avoid the influence of the inlet water on the outlet water of each treatment tank, the treatment tanks adopt bottom inlet water, referring to fig. 1, a first water inlet pipe 1a extends to the bottom of the first treatment tank a and is connected with a first water distribution assembly 3a at the bottom of the first treatment tank a, a second water inlet pipe 1B extends to the bottom of the second treatment tank B and is connected with a second water distribution assembly 3B at the bottom of the second treatment tank B, a third water inlet pipe 1C extends to the bottom of the third treatment tank C and is connected with a third water distribution assembly 3C at the bottom of the third treatment tank C, and a fourth water inlet pipe 1D extends to the bottom of the fourth treatment tank D and is connected with a fourth water distribution assembly 3D at the bottom of the fourth treatment tank D. Wherein, the water distribution component at the bottom of each treatment tank can adopt a water distribution plate or other water distributors to distribute water uniformly.
Referring to fig. 1, the water flows between adjacent treatment tanks are communicated through a communication pipe, one end of the communication pipe is connected to the water outlet tank of the previous treatment tank, and the other end of the communication pipe is connected to the water distribution assembly of the next treatment tank, so that the sewage of the previous treatment tank is sent to the next treatment tank for continuous treatment according to the treatment progress. Specifically, a first communicating pipe 5ab is arranged at the lowest position of the first water outlet tank 4a, the first communicating pipe 5ab extends to the bottom of the first treatment tank A and is connected with a first check valve 6ab, and the first communicating pipe 5ab penetrates through the tank walls of the first treatment tank A and the second treatment tank B and is connected with a second water distribution assembly 3B of the second treatment tank B; a second communicating pipe 5bc is arranged at the lowest position of the second water outlet tank 4B, the second communicating pipe 5bc extends to the bottom of the second treatment pool B and is connected with a second check valve 6bc, and the second communicating pipe 5bc penetrates through the pool walls of the second treatment pool B and the third treatment pool C and is connected with a third water distribution assembly 3C of the third treatment pool C; the lowest part of the third water outlet tank 4C is provided with a third communicating pipe 5cd, the third communicating pipe 5cd extends to the bottom of the third treatment tank C and is connected with a third check valve 6cd, and the third communicating pipe 5cd penetrates through the tank walls of the third treatment tank C and the fourth treatment tank D and is connected with a fourth water distribution assembly 3D of the fourth treatment tank D; the lowest part of the fourth water outlet tank 4D is provided with a fourth communicating pipe 5da, the fourth communicating pipe 5da extends to the bottom of the fourth treating tank D and is connected with a fourth check valve 6da, and the fourth communicating pipe 5da penetrates through the tank walls of the fourth treating tank D and the first treating tank A and is connected with the first water distribution assembly 3a of the first treating tank A.
In some embodiments, referring to fig. 1, the water inlet system includes a water inlet manifold O, the water inlet manifold O is connected to a first water inlet pipe 1a, a second water inlet pipe 1b, a third water inlet pipe 1c and a fourth water inlet pipe 1d, the first water inlet pipe 1a is provided with a first water inlet valve 2a, the second water inlet pipe 1b is provided with a second water inlet valve 2b, the third water inlet pipe 1c is provided with a third water inlet valve 2c, the fourth water inlet pipe 1d is provided with a fourth water inlet valve 2d, the water inlet manifold O continuously supplies water at a constant flow, and only one water inlet valve is in an open state under different operation conditions. Specifically, in the T-th period, the first water inlet valve 2a is opened, and the second water inlet valve 2b, the third water inlet valve 2c and the fourth water inlet valve 2d are closed; in the period 2T, the fourth water inlet valve 2d is opened, and the first water inlet valve 2a, the second water inlet valve 2b and the third water inlet valve 2c are closed; in the 3T period, the third water inlet valve 2c is opened, and the fourth water inlet valve 2d, the first water inlet valve 2a and the second water inlet valve 2b are closed; during the 4T period, the second water inlet valve 2b is opened, and the third water inlet valve 2c, the fourth water inlet valve 2d and the first water inlet valve 2a are closed. The water inlet system is used for constantly feeding water through the water inlet main pipe O. The embodiment can better control the water inlet of each treatment pool, and flexibly and quickly switch the operation condition of the whole system.
In some embodiments, referring to fig. 1, the water outlet system includes a water outlet main pipe 12, a first water outlet pipe, a second water outlet pipe, a third water outlet pipe and a fourth water outlet pipe merge into the water outlet main pipe 12, the first water outlet pipe is provided with a first water outlet valve 11a, the second water outlet pipe is provided with a second water outlet valve 11b, the third water outlet pipe is provided with a third water outlet valve 11c, the fourth water outlet pipe is provided with a fourth water outlet valve 11d, in a T-th period, the fourth water outlet valve 11d is opened, and the first water outlet valve 11a, the second water outlet valve 11b and the third water outlet valve 11c are closed; in the 2T period, the third water outlet valve 11c is opened, and the first water outlet valve 11a, the second water outlet valve 11b and the fourth water outlet valve 11d are closed; in the 3T period, the second water outlet valve 11b is opened, and the first water outlet valve 11a, the third water outlet valve 11c and the fourth water outlet valve 11d are closed; in the 4T period, the first water outlet valve 11a is opened, the fourth water outlet valve 11d, the second water outlet valve 11b and the third water outlet valve 11c are closed, the water outlet of different treatment pools is unified to be discharged through the water outlet main pipe 12, and the water outlet main pipe is in constant-flow continuous water discharge.
Referring to fig. 5, the embodiment of the present invention does not provide a dedicated sedimentation tank, and the treatment tanks are in circulation operation, and sludge exists inside each independent treatment tank and does not advance downstream along with the water flow. The bottoms of the first treatment pool A, the second treatment pool B, the third treatment pool C and the fourth treatment pool D are all provided with sludge discharge pipes, and the sludge discharge pipes are provided with sludge discharge valves 13a, 13B, 13C and 13D. The excess sludge in each treatment tank can be discharged through the respective sludge discharge pipe. The granular sludge provided by the embodiment of the invention has low water content, and is convenient for subsequent sludge treatment.
Referring to fig. 1, with reference to table 1, in order to better control the aeration of each treatment tank and flexibly and rapidly switch the operation conditions of the whole system, the aeration system includes an air compressor 10 and an aeration main pipe, a first aeration assembly 8a is connected to the aeration main pipe through a first aeration valve 7a, a second aeration assembly 8b is connected to the aeration main pipe through a second aeration valve 7b, a third aeration assembly 8c is connected to the aeration main pipe through a third aeration valve 7c, a fourth aeration assembly 8d is connected to the aeration main pipe through a fourth aeration valve 7d, and the aeration main pipe can be controlled by the first aeration valve 7a, the second aeration valve 7b, the third aeration valve 7c and the fourth aeration valve 7d to independently aerate each treatment tank. During operation, the aeration main pipe conducts constant-current continuous aeration, the second aeration valve is opened in the T period, the first aeration valve is opened in the 0.5-1T period, the third aeration valve is opened in the 0-0.5T period, and the fourth aeration valve is closed; in the 2T period, the first aeration valve is opened, the fourth aeration valve is opened in the 0.5-1T period, the second aeration valve is opened in the 0-0.5T period, and the third aeration valve is closed; in the 3T period, the fourth aeration valve is opened, the third aeration valve is opened in the 0.5-1T period, the first aeration valve is opened in the 0-0.5T period, and the second aeration valve is closed; and in the 4T period, the third aeration valve is opened, the second aeration valve is opened in the 0.5-1T period, the fourth aeration valve is opened in the 0-0.5T period, and the first aeration valve is closed. The embodiment of the invention adopts the continuous cycle operation of the four pools, and the constant aeration is kept through the switching of the aeration valves, thereby being more beneficial to the control of the fan and prolonging the service life of the fan.
In some embodiments, referring to fig. 1, aeration mixing devices are disposed in the first effluent tank 4a, the second effluent tank 4b, the third effluent tank 4c and the fourth effluent tank 4d, and the aeration mixing devices are connected to an air compressor 10 through aeration pipelines provided with mixing air valves 9a, 9b, 9c and 9 d.
In some embodiments, mechanical mixing devices are disposed in each of the first exit channel 4a, the second exit channel 4b, the third exit channel 4c, and the fourth exit channel 4 d.
In some embodiments, referring to fig. 2, the treatment tank includes a main tank body, the main tank body is rectangular, polygonal, circular, or the like, a partition wall is disposed in the main tank body, and the main tank body is divided into a first treatment tank a, a second treatment tank B, a third treatment tank C, and a fourth treatment tank D by the partition wall, and the first treatment tank a, the second treatment tank B, the third treatment tank C, and the fourth treatment tank D are sequentially distributed along the circumferential direction of the main tank body. In the embodiment, the adjacent treatment tanks share the partition wall, so that the structure of the treatment tanks is simplified, and the arrangement of the water inlet system, the water outlet system and the aeration system on the treatment tanks is facilitated.
In addition to the integrated main body tank, each treatment tank may also be a split structure, for example, in some embodiments, referring to fig. 3 and 4, the first treatment tank a, the second treatment tank B, the third treatment tank C, and the fourth treatment tank D are independent tanks, each independent tank may be rectangular, polygonal, circular, or the like, the first treatment tank a is adjacent to the second treatment tank B, the second treatment tank B is adjacent to the third treatment tank C, the third treatment tank C is adjacent to the fourth treatment tank D, and the fourth treatment tank D is adjacent to the fourth treatment tank D.
When in operation, water flow in the pool body flows through A, B, C, D four pools in turn along the anticlockwise direction; the four water inlet and outlet valves are opened and closed in turn, and only one water inlet point position and one water outlet point position are opened each time; the opening and closing sequence of the four water inlet and outlet valves is clockwise.
In some embodiments, the maximum dissolved oxygen can be controlled to be more than 5mg/L during starting, and more than 50mg/L of calcium and magnesium ions or more than 100mg/L of diatomite or magnetic powder can be added to accelerate the formation of the aerobic granular sludge.
In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.
Claims (10)
1. A method for treating wastewater, comprising treating wastewater with a wastewater treatment system, the wastewater treatment system comprising:
the treatment tank comprises a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank, wherein a first water outlet tank is arranged at the top of the first treatment tank, a first communicating pipe leading into the second treatment tank is arranged in the first water outlet tank, a second water outlet tank is arranged at the top of the second treatment tank, a second communicating pipe leading into the third treatment tank is arranged in the second water outlet tank, a third water outlet tank is arranged at the top of the third treatment tank, a third communicating pipe leading into the fourth treatment tank is arranged in the third water outlet tank, a fourth water outlet tank is arranged at the top of the fourth treatment tank, and a fourth communicating pipe leading into the first treatment tank is arranged in the fourth water outlet tank;
the water inlet system comprises a first water inlet pipe connected with the first treatment pool, a second water inlet pipe connected with the second treatment pool, a third water inlet pipe connected with the third treatment pool and a fourth water inlet pipe connected with the fourth treatment pool;
the water outlet system comprises a first water outlet pipe connected with the first water outlet tank, a second water outlet pipe connected with the second water outlet tank, a third water outlet pipe connected with the third water outlet tank and a fourth water outlet pipe connected with the fourth water outlet tank;
the aeration system comprises a first aeration component arranged at the bottom of the first treatment tank, a second aeration component arranged at the bottom of the second treatment tank, a third aeration component arranged at the bottom of the third treatment tank and a fourth aeration component arranged at the bottom of the fourth treatment tank;
the sewage treatment method comprises the following steps:
and in the T period, the first water inlet pipe and the fourth water outlet pipe are opened, the water flow sequence is a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank, and the operation working conditions of the treatment tanks are as follows: the first treatment tank A is fed with water, aeration is started in the time period of 0.5-1T, the second treatment tank B is aerated, aeration is started in the time period of 0-0.5T in the third treatment tank C, and water is discharged from the fourth treatment tank D;
in the 2T period, a fourth water inlet pipe and a third water outlet pipe are opened, the water flow is sequentially from a fourth treatment pool, a first treatment pool, a second treatment pool and a third treatment pool, and the operation conditions of the treatment pools are as follows: the fourth treatment tank is filled with water, aeration and the first treatment tank are started at the time interval of 0.5-1T, aeration and the second treatment tank are started at the time interval of 0-0.5T, and water is discharged from the third treatment tank;
and in the 3T period, a third water inlet pipe and a second water inlet pipe are opened, the water flow sequence is a third treatment pool, a fourth treatment pool, a first treatment pool and a second treatment pool, and the operation conditions of the treatment pools are as follows: the aeration of the third treatment tank and the aeration of the fourth treatment tank are started in the time interval of 0.5-1T, the aeration of the first treatment tank is started in the time interval of 0-0.5T, and the water is discharged from the second treatment tank;
and in the 4T period, a second water inlet pipe and a first water outlet pipe are opened, the water flow sequence is a second treatment tank, a third treatment tank, a fourth treatment tank and a first treatment tank, and the operation working conditions of the treatment tanks are as follows: the second treatment tank is used for feeding water, the aeration and the third treatment tank are started at the time interval of 0.5-1T, the aeration and the first treatment tank A are started at the time interval of 0-0.5T in the fourth treatment tank;
one operation cycle is formed from the T-th period to the 4T-th period, and is circulated.
2. The wastewater treatment method according to claim 1, wherein the first water inlet pipe extends to the bottom of the first treatment tank and is connected with a first water distribution assembly at the bottom of the first treatment tank, the second water inlet pipe extends to the bottom of the second treatment tank and is connected with a second water distribution assembly at the bottom of the second treatment tank, the third water inlet pipe extends to the bottom of the third treatment tank and is connected with a third water distribution assembly at the bottom of the third treatment tank, and the fourth water inlet pipe extends to the bottom of the fourth treatment tank and is connected with a fourth water distribution assembly at the bottom of the fourth treatment tank.
3. The sewage treatment method according to claim 2, wherein the lowest part of the first water outlet tank is provided with the first communication pipe, the first communication pipe extends to the bottom of the first treatment tank and is connected with a first check valve, and the first communication pipe penetrates through the tank walls of the first treatment tank and the second treatment tank and is connected with the second water distribution assembly of the second treatment tank; the lowest part of the second water outlet groove is provided with the second communicating pipe, the second communicating pipe extends to the bottom of the second treatment tank and is connected with a second check valve, and the second communicating pipe penetrates through the walls of the second treatment tank and the third treatment tank and is connected with the third water distribution assembly of the third treatment tank; the lowest part of the third water outlet tank is provided with the third communicating pipe, the third communicating pipe extends to the bottom of the third treatment tank and is connected with a third check valve, and the third communicating pipe penetrates through the tank walls of the third treatment tank and the fourth treatment tank and is connected with the fourth water distribution assembly of the fourth treatment tank; the fourth water outlet tank is arranged at the lowest position of the fourth water outlet tank, the fourth communicating pipe extends to the bottom of the fourth treatment tank and is connected with a fourth check valve, and the fourth communicating pipe penetrates through the fourth treatment tank and the tank wall of the first treatment tank and is connected with the first water distribution assembly of the first treatment tank.
4. The sewage treatment method according to claim 1, wherein the water inlet system comprises a water inlet main pipe, the water inlet main pipe is connected with the first water inlet pipe, the second water inlet pipe, the third water inlet pipe and a fourth water inlet pipe, the first water inlet pipe is provided with a first water inlet valve, the second water inlet pipe is provided with a second water inlet valve, the third water inlet pipe is provided with a third water inlet valve, the fourth water inlet pipe is provided with a fourth water inlet valve, the water inlet main pipe continuously supplies water at a constant flow, and in a T period, the first water inlet valve is opened, and the second water inlet valve, the third water inlet valve and the fourth water inlet valve are closed; during the 2T period, the fourth water inlet valve is opened, and the first water inlet valve, the second water inlet valve and the third water inlet valve are closed; during the 3T period, the third water inlet valve is opened, and the fourth water inlet valve, the first water inlet valve and the second water inlet valve are closed; and in the 4T period, the second water inlet valve is opened, and the third water inlet valve, the fourth water inlet valve and the first water inlet valve are closed.
5. The wastewater treatment method according to claim 1, wherein the water outlet system comprises a water outlet main pipe, the first water outlet pipe, the second water outlet pipe, the third water outlet pipe and the fourth water outlet pipe are merged into the water outlet main pipe, the first water outlet pipe is provided with a first water outlet valve, the second water outlet pipe is provided with a second water outlet valve, the third water outlet pipe is provided with a third water outlet valve, the fourth water outlet pipe is provided with a fourth water outlet valve, and the fourth water outlet valve is opened and the first water outlet valve, the second water outlet valve and the third water outlet valve are closed in a T period; in the 2T period, the third water outlet valve is opened, and the first water outlet valve, the second water outlet valve and the fourth water outlet valve are closed; in a 3T period, the second water outlet valve is opened, and the first water outlet valve, the third water outlet valve and the fourth water outlet valve are closed; in the 4T period, the first water outlet valve is opened, the fourth water outlet valve, the second water outlet valve and the third water outlet valve are closed, and the water outlet main pipe continuously discharges water at a constant flow.
6. The sewage treatment method according to claim 1, wherein the aeration system comprises an air compressor and an aeration main pipe, the first aeration component is connected to the aeration main pipe through a first aeration valve, the second aeration component is connected to the aeration main pipe through a second aeration valve, the third aeration component is connected to the aeration main pipe through a third aeration valve, the fourth aeration component is connected to the aeration main pipe through a fourth aeration valve, the aeration main pipe is subjected to constant-current continuous aeration, the second aeration valve is opened during the T period, the first aeration valve is opened during the 0.5-1T period, the third aeration valve is opened during the 0-0.5T period, and the fourth aeration valve is closed; in the 2T period, the first aeration valve is opened, the fourth aeration valve is opened in the 0.5-1T period, the second aeration valve is opened in the 0-0.5T period, and the third aeration valve is closed; in the 3T period, the fourth aeration valve is opened, the third aeration valve is opened in the 0.5-1T period, the first aeration valve is opened in the 0-0.5T period, and the second aeration valve is closed; and in the 4T period, the third aeration valve is opened, the second aeration valve is opened in the 0.5-1T period, the fourth aeration valve is opened in the 0-0.5T period, and the first aeration valve is closed.
7. The sewage treatment method according to claim 6, wherein the first, second, third and fourth effluent tanks are provided with aeration mixing devices, and the aeration mixing devices are connected with the air compressor through an aeration pipeline provided with a mixing air valve.
8. The wastewater treatment method according to claim 1, wherein the first outlet trough, the second outlet trough, the third outlet trough and the fourth outlet trough are all provided with a mechanical mixing device.
9. The wastewater treatment method according to claim 1, wherein the treatment tank comprises a main tank body, the main tank body is provided with a partition wall therein and is divided into a first treatment tank, a second treatment tank, a third treatment tank and a fourth treatment tank by the partition wall, and the first treatment tank, the second treatment tank, the third treatment tank and the fourth treatment tank are sequentially distributed along the circumferential direction of the main tank body.
10. The wastewater treatment method according to claim 1, wherein the first treatment tank, the second treatment tank, the third treatment tank and the fourth treatment tank are independent tanks, the first treatment tank is adjacent to the second treatment tank, the second treatment tank is adjacent to the third treatment tank, the third treatment tank is adjacent to the fourth treatment tank, and the fourth treatment tank is adjacent to the fourth treatment tank.
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