CN210559922U - Sewage treatment system - Google Patents
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- CN210559922U CN210559922U CN201921116191.2U CN201921116191U CN210559922U CN 210559922 U CN210559922 U CN 210559922U CN 201921116191 U CN201921116191 U CN 201921116191U CN 210559922 U CN210559922 U CN 210559922U
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Abstract
The application provides a sewage treatment system. The sewage treatment system comprises a biological membrane unit. The biological membrane unit comprises a carbon nitrogen biological membrane unit and/or a denitrification biological membrane unit, and the introduced water body is purified in the biological membrane unit to obtain the purified water body. The application provides a sewage treatment system through multistage biomembrane unit, carries out COD, suspended solid, ammonia nitrogen and total nitrogen, total phosphorus to sewage and gets rid of, can be more comprehensive handle sewage, effectively improve quality of water.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to a sewage treatment system.
Background
The sewage is a general term for water discharged in production and living activities, and the water is deteriorated and can not keep the original use function because new substances are mixed in the water or because the external conditions are changed.
Sewage treatment is a process of purifying sewage by separating contaminants contained in the sewage or converting them into harmless substances using various methods. Sewage treatment is widely applied to various fields such as buildings, agriculture, traffic, energy, petrifaction, environmental protection, urban landscape, medical treatment, catering and the like, and is increasingly used in daily life of common people.
At present, the sewage treatment process can be divided into primary treatment, secondary treatment and tertiary treatment, the whole process is that the raw sewage passing through a coarse grid is lifted by a sewage lifting pump and then enters a grit chamber through a grid or a sand filter, the sewage after sand-water separation in the grit chamber enters a primary sedimentation tank, the primary treatment (physical treatment) is performed, the effluent of the primary sedimentation tank enters biological treatment equipment, the effluent of the biological treatment equipment enters a secondary sedimentation tank, the secondary treatment is performed, the effluent of the secondary sedimentation tank is disinfected and discharged or enters tertiary treatment, and the tertiary treatment generally adopts a coagulating sedimentation method, a sand filtration method, an activated carbon adsorption method, an ion exchange method and other methods for treatment.
However, in practical application, the denitrification effect of the process is not ideal, and the treatment of sewage is not thorough.
Disclosure of Invention
In view of this, the embodiment of the present application provides a sewage treatment system, so as to solve the technical defects existing in the prior art.
A sewage treatment system comprising a biofilm unit;
the biological membrane unit comprises a carbon nitrogen biological membrane unit and/or a denitrification biological membrane unit, and the introduced water body is purified in the biological membrane unit to obtain the purified water body.
Further, the sewage treatment system also comprises a pretreatment unit, wherein the pretreatment unit comprises an anaerobic tank, an anoxic tank, an aerobic tank and a secondary sedimentation tank which are sequentially communicated;
the anaerobic tank is communicated with the anoxic tank through a pipeline, the fed sewage is subjected to anaerobic treatment in the anaerobic tank to obtain a first intermediate water body, and the first intermediate water body is fed into the anoxic tank;
the anoxic tank is connected between the anaerobic tank and the aerobic tank through a pipeline, the first intermediate water body introduced into the anoxic tank is subjected to anoxic treatment to obtain a second intermediate water body, and the second intermediate water body is introduced into the aerobic tank;
the aerobic tank is connected between the anoxic tank and the secondary sedimentation tank through a pipeline, the second intermediate water body introduced into the aerobic tank is subjected to aerobic treatment to obtain a third intermediate water body, 40-60% of the third intermediate water body is introduced into the anoxic tank, and the rest of the third intermediate water body is introduced into the secondary sedimentation tank;
and the secondary sedimentation tank is communicated with the aerobic tank through a pipeline, a third intermediate water body introduced into the secondary sedimentation tank is subjected to sedimentation treatment to obtain sludge and an intermediate water body, the sludge is introduced into the anaerobic tank, and the intermediate water body is introduced into the biological membrane unit.
Further, the sewage treatment system also comprises a pretreatment unit, wherein the pretreatment unit comprises a first biological reaction tank;
the first biological reaction tank is communicated with the biological membrane unit through a pipeline, the sewage which is introduced into the first biological reaction tank is subjected to homogenization treatment, primary precipitation treatment, biodegradation treatment and secondary precipitation treatment to obtain a biological reaction intermediate water body, and the biological reaction intermediate water body is introduced into the biological membrane unit.
Further, the sewage treatment system also comprises a pretreatment unit, wherein the pretreatment unit comprises a second biological reaction tank;
the second biological reaction tank is communicated with the biological membrane unit through a pipeline, the introduced sewage is aerated in the second biological reaction tank to obtain an aerated intermediate water body, and the aerated intermediate water body is introduced into the biological membrane unit.
Further, the biofilm unit is a carbon-nitrogen biofilm unit;
and carrying out ammonia nitrogen removal treatment on the introduced intermediate water body in the carbon nitrogen biological film unit to obtain the purified water body.
Further, the biofilm unit is a denitrification biofilm unit;
and carrying out denitrification treatment on the introduced intermediate water body in the denitrification biomembrane unit to obtain the purified water body.
Further, the biological membrane unit comprises a carbon-nitrogen biological membrane unit and a denitrification biological membrane unit which are communicated;
the carbon-nitrogen biological membrane unit is connected with the denitrification biological membrane unit through a pipeline, the introduced intermediate water body is subjected to ammonia nitrogen removal treatment in the carbon-nitrogen biological membrane unit to obtain a primary purified water body, and the primary purified water body is introduced into the denitrification biological membrane unit;
and the denitrification biomembrane unit is communicated with the carbon-nitrogen biomembrane unit through a pipeline, and the introduced primary purified water body is subjected to denitrification treatment in the denitrification biomembrane unit to obtain the purified water body.
Further, the carbon nitrogen biofilm unit comprises at least one carbon nitrogen biofilm pool;
the carbon-nitrogen biological membrane tank is internally provided with a first filler, the bottom of the carbon-nitrogen biological membrane tank is provided with an aeration pipeline and a water inlet pipeline, gas is introduced into the carbon-nitrogen biological membrane tank through the aeration pipeline, and the intermediate water body is introduced into the carbon-nitrogen biological membrane tank through the water inlet pipeline for treatment to obtain a purified water body or a primary purified water body.
Further, the denitrification biomembrane unit comprises at least one denitrification biomembrane pool;
and a second filler is arranged in the denitrification biomembrane pond, a water inlet pipeline is arranged at the bottom of the denitrification biomembrane pond, and the intermediate water body is introduced into the denitrification biomembrane pond through the water inlet pipeline for denitrification treatment to obtain the purified water body.
The application provides a sewage treatment system, through setting up the biomembrane unit, remove ammonia nitrogen and denitrification treatment to sewage, remove COD, Suspended Solid (SS), ammonia nitrogen and total nitrogen, total phosphorus in the sewage, can make sewage treatment more comprehensive and thorough, effectively improve the denitrogenation effect, effectively improve quality of water.
Drawings
FIG. 1 is a schematic view of a sewage treatment system according to an embodiment of the present application;
FIG. 2 is a schematic view of a sewage treatment system according to an embodiment of the present application;
FIG. 3 is a schematic view of a sewage treatment system according to an embodiment of the present application;
FIG. 4a is a schematic view of a sewage treatment system according to an embodiment of the present application;
FIG. 4b is a schematic illustration of the steps of a wastewater treatment process according to an embodiment of the present application;
FIG. 4c is a schematic view of the steps of a wastewater treatment process according to an embodiment of the present application;
FIG. 4d is a schematic illustration of the steps of a wastewater treatment process according to an embodiment of the present application;
FIG. 5 is a schematic view of a sewage treatment system according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a wastewater treatment system according to an embodiment of the present application.
Reference numerals
1-a carbon nitrogen biological membrane pool, 2-an aeration pipeline, 3-a denitrification biological membrane pool, 4-an anaerobic pool, 5-an anoxic pool, 6-an aerobic pool, 7-a secondary sedimentation pool, 8-a first biological reaction pool and 9-a second biological reaction pool.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The terminology used in the description of the one or more embodiments is for the purpose of describing the particular embodiments only and is not intended to be limiting of the description of the one or more embodiments. As used in one or more embodiments of the present specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in one or more embodiments of the present specification refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It will be understood that, although the terms first, second, etc. may be used herein in one or more embodiments to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, a first can also be referred to as a second and, similarly, a second can also be referred to as a first without departing from the scope of one or more embodiments of the present description. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
First, the noun terms to which one or more embodiments of the present invention relate are explained.
Biochemical Oxygen Demand (BOD): the total amount of dissolved oxygen in water consumed during the oxidation decomposition of organic matters in water due to the biochemical action of microbes and the mineralization or gasification of the organic matters is also called biochemical oxygen consumption.
Chemical Oxygen Demand (Chemical Oxygen Demand, COD): also called chemical oxygen consumption, which is to use chemical oxidant (such as potassium permanganate) to oxidize and decompose oxidizable substances (such as organic substances, nitrite, ferrous salt, sulfide, etc.) in water, and then calculate the consumption of oxygen according to the amount of residual oxidant. It is an important indicator of the degree of water pollution, as is BOD. The COD is expressed in ppm or mg/L, and the smaller the value, the lower the degree of water pollution.
Sequencing batch activated sludge process (SBR): the activated sludge sewage treatment method is characterized by that in the same reaction tank (reactor), the five basic procedures of water intake, aeration, precipitation, water discharge and stand-by are combined according to the time sequence.
An oxidation ditch process: the oxidation ditch process is a modification of the activated sludge process, and is named because the structure of the oxidation ditch is a closed annular ditch. Because sewage and activated sludge continuously circulate in the aeration channel, they are called "circulation aeration tank" and "non-terminal aeration tank".
Homogenizing: by adopting certain process measures, the process of reducing the fluctuation amplitude of the chemical components of the material and enabling the chemical components of the material to be uniform is achieved.
In the present application, a wastewater treatment system and method are provided, which are described in detail in the following examples one by one.
Example 1
As shown in fig. 1, 2 and 3, a sewage treatment system comprises a biological membrane unit.
The biofilm unit may be a primary biofilm unit, a two-stage biofilm unit, or a multi-stage biofilm unit, which is not limited in this application.
The biological membrane unit comprises a carbon nitrogen biological membrane unit and/or a denitrification biological membrane unit, and the introduced water body is purified in the biological membrane unit to obtain the purified water body.
Specifically, the biofilm unit can be a carbon-nitrogen biofilm unit, can also be a denitrification biofilm unit, and can also comprise both the carbon-nitrogen biofilm unit and the denitrification biofilm unit.
In the case where the biofilm unit is a carbon-nitrogen biofilm unit, as shown in fig. 1, the water body introduced into the carbon-nitrogen biofilm unit may be subjected to ammonia-nitrogen removal treatment to obtain the purified water body.
Wherein the carbon nitrogen biofilm unit comprises at least one carbon nitrogen biofilm tank 1. Under the condition that the carbon-nitrogen biomembrane unit only comprises one carbon-nitrogen biomembrane pond 1, directly introducing a water body into the carbon-nitrogen biomembrane pond 1 for ammonia and nitrogen removal treatment, under the condition that the carbon-nitrogen biomembrane unit comprises two or more carbon-nitrogen biomembrane ponds 1, the two or more carbon-nitrogen biomembrane ponds 1 are sequentially connected, and after the water body is introduced into the first carbon-nitrogen biomembrane pond 1, the water body is sequentially introduced into each subsequent carbon-nitrogen biomembrane pond 1 for treatment until the last carbon-nitrogen biomembrane pond 1 is discharged after the treatment is completed.
The carbon-nitrogen biological membrane tank 1 is internally provided with a first filler, the bottom of the carbon-nitrogen biological membrane tank is provided with an aeration pipeline 2 and a water inlet pipeline, gas is introduced into the carbon-nitrogen biological membrane tank 1 through the aeration pipeline 2, and the intermediate water body is introduced into the carbon-nitrogen biological membrane tank 1 through the water inlet pipeline for treatment to obtain a purified water body or a primary purified water body.
The first filler is made of plastics and comprises high-density polyethylene or polyvinyl chloride, the density of the first filler is slightly smaller than that of water, the first filler can be in various shapes such as a cube, a cylinder and a ring, the first filler is non-fixed in the carbon-nitrogen biomembrane pond 1, the filling rate of the first filler in the carbon-nitrogen biomembrane pond 1 is more than 60%, the first filler is stacked to form a filler bed, and the first filler is static and does not move along with the flowing of water flow under a normal state. The first filler has large specific surface area, and microorganisms can be attached to the surface of the first filler to form a biological film so as to remove pollutants through metabolism. The non-fixed first filler is convenient for the regular cleaning of the filler, so that the aged biological membrane is eliminated, and the higher removal efficiency is kept. The aeration tube 2 may be a perforated tube to reduce air-out resistance. The gas introduced into the carbon-nitrogen biofilm tank 1 through the aeration pipeline 2 can be oxygen or mixed gas with the oxygen content reaching a certain standard.
In the case that the biofilm unit is a denitrification biofilm unit, as shown in fig. 2, the introduced intermediate water body may be subjected to denitrification treatment in the denitrification biofilm unit to obtain the purified water body.
The denitrification biomembrane unit comprises at least one denitrification biomembrane pool 3. Under the condition that the denitrification biomembrane unit only comprises one denitrification biomembrane pool 3, directly introducing the intermediate water body into the denitrification biomembrane pool 3 for denitrification treatment, under the condition that the denitrification biomembrane unit comprises two or more denitrification biomembrane pools 3, the two or more denitrification biomembrane pools 3 are sequentially connected, and after the intermediate water body is introduced into the first denitrification biomembrane pool 3, the intermediate water body is sequentially introduced into each subsequent denitrification biomembrane pool 3 for treatment until the last denitrification biomembrane pool 3 is discharged after the treatment is completed.
And a second filler is arranged in the denitrification biomembrane pond 3, a water inlet pipeline is arranged at the bottom of the denitrification biomembrane pond, and the intermediate water body is introduced into the denitrification biomembrane pond 3 through the water inlet pipeline for denitrification treatment to obtain the purified water body.
The second filler is made of plastics and comprises high-density polyethylene or polyvinyl chloride, the density of the second filler is slightly smaller than that of water, the second filler can also be in various shapes such as a cube, a cylinder and a ring, the second filler is non-fixed in the denitrification biomembrane pond 3, the filling rate of the second filler in the denitrification biomembrane pond 3 is more than 60%, the second filler is stacked to form a filler bed, and the second filler is static under a normal state and does not move along with the flowing of water flow. And the specific surface area of the second filler is large, and microorganisms can be attached to the surface of the second filler to grow so as to form a biological film, so that pollutants can be removed through metabolism. The non-fixed second filler is convenient for the regular cleaning of the filler, so that the aged biological membrane is eliminated, and the higher removal efficiency is kept.
In the case where the biofilm unit includes a carbon nitrogen biofilm unit and a denitrification biofilm unit that are in communication with each other, the carbon nitrogen biofilm unit is in communication with the denitrification biofilm unit through a pipe, as shown in fig. 3.
The water body introduced into the carbon-nitrogen biological membrane unit can be subjected to ammonia nitrogen removal treatment to obtain a primary purified water body, and the primary purified water body is introduced into the denitrification biological membrane unit; and carrying out denitrification treatment on the introduced primary purified water body in the denitrification biomembrane unit to obtain the purified water body.
The application provides a sewage treatment system, through setting up the biomembrane unit, remove ammonia nitrogen and denitrification treatment to sewage, remove COD, Suspended Solid (SS), ammonia nitrogen and total nitrogen, total phosphorus in the sewage, can make sewage treatment more comprehensive and thorough, effectively improve the denitrogenation effect, effectively improve quality of water.
The application sewage treatment system, all pack in the biomembrane pond among the biomembrane unit (carbon nitrogen biomembrane pond 1 and denitrification biomembrane pond 3) and have filler (first filler and second filler) to form the packed bed, the packed bed specific surface is big, and the microorganism quantity that can adhere to its growth is many, and the biomembrane pond water conservancy load of unit volume is big, can effectively save occupation of land and investment.
Example 2
As shown in FIG. 4a, a sewage treatment system comprises a pretreatment unit and a biological membrane unit which are communicated with each other.
The pretreatment unit is provided with a water inlet, sewage is introduced into the pretreatment unit through the water inlet for treatment to obtain an intermediate water body, and the intermediate water body is introduced into the biological membrane unit; the biological membrane unit comprises a carbon nitrogen biological membrane unit and/or a denitrification biological membrane unit, and the introduced intermediate water body is purified in the biological membrane unit to obtain a purified water body.
Specifically, the pretreatment unit comprises an anaerobic tank 4, an anoxic tank 5, an aerobic tank 6 and a secondary sedimentation tank 7 which are communicated in sequence.
The anaerobic tank 4 is communicated with the anoxic tank 5 through a pipeline, the introduced sewage is subjected to anaerobic treatment in the anaerobic tank 4 to obtain a first intermediate water body, and the first intermediate water body is introduced into the anoxic tank 5.
The anaerobic tank 4 is one of sewage treatment facilities, and can be also called as an anaerobic reactor, and the tank shape can be rectangular, square, round and the like, and provides a suitable environment for the growth and decomposition of anaerobic bacteria and facultative bacteria. Anaerobic bacteria in the anaerobic tank 4 can hydrolyze, acidify and methanize organic matters so as to remove the organic matters in the sewage, improve the biodegradability of the sewage and be beneficial to subsequent aerobic treatment; the facultative bacteria can convert easily degradable organic matters in the sewage into Volatile Fatty Acids (VFAs), the sludge (activated sludge) in the anaerobic tank 4 contains the polyphosphate bacteria, and the phosphate bacteria can release the phosphate and absorb the easily degradable organic matters such as lower fatty acids in the anaerobic stage.
The anoxic pond 5 is connected between the anaerobic pond 4 and the aerobic pond 6 through a pipeline, the first intermediate water body introduced into the anoxic pond 5 is subjected to anoxic treatment to obtain a second intermediate water body, and the second intermediate water body is introduced into the aerobic pond 6.
The anoxic tank 5 is one of sewage treatment facilities, the concentration of dissolved oxygen in the anoxic tank 5 is greater than that in the anaerobic tank 4 and is less than that in the aerobic tank 6, and specifically, the concentration of dissolved oxygen in the anoxic tank 5 can be 0.2-0.5mg/L, which is beneficial to the growth of strains such as denitrifying bacteria and the like and the denitrifying denitrification of the denitrifying bacteria on the first intermediate water body, and is also beneficial to the adsorption and degradation of organic matters by activated sludge.
The aerobic tank 6 is connected between the anoxic tank 5 and the secondary sedimentation tank 7 through a pipeline, the second intermediate water body introduced into the aerobic tank 6 is subjected to aerobic treatment to obtain a third intermediate water body, 40-60% of the third intermediate water body is introduced into the anoxic tank 5, and the rest of the third intermediate water body is introduced into the secondary sedimentation tank 7.
in the aerobic tank 6, the phosphorus accumulating bacteria in the sludge can not only absorb and utilize the readily degradable BOD remained in the second intermediate water body, but also decompose the carbon source poly- β -hydroxybutyrate (PHB) stored in the tank body to generate energy for self growth and reproduction, actively absorb the dissolved phosphorus in the environment and store the absorbed dissolved phosphorus in the tank body in the form of phosphorus accumulation.
The nitrifying bacteria in the aerobic tank 6 can convert the ammonia nitrogen in the second intermediate water body and the ammonia nitrogen generated by ammoniating the organic nitrogen into nitrate and nitrite through biological nitrification. The nitrite nitrogen and the nitrate nitrogen which are introduced into 40-60% of the third intermediate water body in the anoxic pond 5 can generate ammonia gas to be released under the action of denitrifying bacteria in the anoxic pond 5.
The secondary sedimentation tank 7 is communicated with the aerobic tank 6 through a pipeline, a third intermediate water body is introduced into the secondary sedimentation tank 7 for sedimentation treatment to obtain sludge and an intermediate water body, the sludge is introduced into the anaerobic tank 4, and the intermediate water body is introduced into the biological membrane unit.
The secondary sedimentation tank 7 is one of sewage treatment facilities, and is used for carrying out sedimentation treatment on a third intermediate water body to achieve mud-water separation, the separated sludge is led back to the anaerobic tank 4, phosphorus accumulating bacteria grow in the sludge, the phosphorus accumulating bacteria decompose phosphorus in the sludge and release phosphorus in the anaerobic tank 4, part of the energy released in the process of releasing the phosphorus can be used for the aerobic phosphorus accumulating bacteria to keep alive in an anaerobic environment, and the other part of the energy can be used for the phosphorus accumulating bacteria to actively absorb VFAs (nitrogen-containing phosphate) and store a carbon source PHB required by the phosphorus accumulating bacteria in the body.
Specifically, the biofilm unit can be a carbon-nitrogen biofilm unit, can also be a denitrification biofilm unit, and can also comprise both the carbon-nitrogen biofilm unit and the denitrification biofilm unit.
In the case where the biofilm unit is a carbon-nitrogen biofilm unit, the intermediate water body introduced into the carbon-nitrogen biofilm unit may be subjected to ammonia-nitrogen removal treatment to obtain the purified water body.
And under the condition that the biofilm unit is a denitrification biofilm unit, performing denitrification treatment on the introduced intermediate water body in the denitrification biofilm unit to obtain the purified water body.
Under the condition that the biological membrane unit comprises a carbon-nitrogen biological membrane unit and a denitrification biological membrane unit which are communicated, the carbon-nitrogen biological membrane unit is connected between the pretreatment unit and the denitrification biological membrane unit through a pipeline, and the denitrification biological membrane unit is communicated with the carbon-nitrogen biological membrane unit through a pipeline.
The introduced intermediate water body can be subjected to ammonia nitrogen removal treatment in the carbon nitrogen biological membrane unit to obtain a primary purified water body, and the primary purified water body is introduced into the denitrification biological membrane unit; and carrying out denitrification treatment on the introduced primary purified water body in the denitrification biomembrane unit to obtain the purified water body.
Further, the method applied to the sewage treatment system of the present embodiment may include steps S10 to S20, as shown in fig. 4 b.
And S10, introducing the sewage into the pretreatment unit for treatment to obtain an intermediate water body.
Further, the pretreatment unit comprises an anaerobic tank 4, an anoxic tank 5, an aerobic tank 6 and a secondary sedimentation tank 7 which are communicated in sequence, and the step S10 comprises steps S11 to S14, as shown in FIG. 4 c.
S11, introducing the sewage into the anaerobic tank 4 for anaerobic treatment to obtain a first intermediate water body.
Specifically, after the sewage is introduced into the anaerobic tank 4, anaerobic bacteria in the anaerobic tank 4 remove organic matters in the sewage through hydrolysis, acidification and methanation, facultative bacteria remove easily degradable organic matters in the sewage by converting the easily degradable organic matters into VFAs, and phosphorus accumulating bacteria remove easily degradable organic matters such as low-grade fatty acids in the sewage in an absorption mode to obtain a first intermediate water body.
And S12, introducing the first intermediate water body into the anoxic pond 5 for anoxic treatment to obtain a second intermediate water body.
Specifically, after the first intermediate water body is introduced into the anoxic tank 5, denitrifying bacteria in the anoxic tank 5 perform denitrifying denitrification on the first intermediate water body, that is, the denitrifying bacteria denitrify Nitrate (NO) in the first intermediate water body3-) Nitrogen (N) in (A) is passed through a series of intermediates (NO)2-、NO、N2O) reduction to nitrogen (N)2) And removing to obtain a second intermediate water body.
S13, introducing the second intermediate water body into the aerobic tank 6 for aerobic treatment to obtain a third intermediate water body, introducing 40-60% of the third intermediate water body into the anoxic tank 5, and continuing to perform the step S12, and continuing to perform the step S14 on the rest third intermediate water body.
Specifically, after the second intermediate water body is introduced into the aerobic tank 6, the phosphorus accumulating bacteria in the aerobic tank 6 can absorb and utilize the easily degradable organic matters remaining in the second intermediate water body and the dissolved phosphorus in the environment, and store the absorbed dissolved phosphorus in the form of phosphorus accumulation in the body of the second intermediate water body.
The nitrifying bacteria in the aerobic tank 6 can convert the ammonia nitrogen in the second intermediate water body and the ammonia nitrogen generated by ammoniating the organic nitrogen into nitrate and nitrite through biological nitrification. The nitrite nitrogen and the nitrate nitrogen which are introduced into 40-60% of the third intermediate water body in the anoxic pond 5 can generate ammonia gas to be released under the action of denitrifying bacteria in the anoxic pond 5.
S14, introducing the third intermediate water body into the secondary sedimentation tank 7 for sedimentation treatment to obtain sludge and intermediate water body, introducing the sludge into the anaerobic tank 4, continuing to execute the step S11, introducing the intermediate water body into the biological membrane unit, and continuing to execute the step S20.
Specifically, the third intermediate water body is introduced into the secondary sedimentation tank 7 to achieve mud-water separation through sedimentation, the separated sludge is introduced back into the anaerobic tank 4, phosphorus accumulating bacteria grow in the sludge, the phosphorus accumulating bacteria decompose phosphorus accumulating in the sludge and release phosphorus, part of the energy released in the process of releasing phosphorus can be used for the aerobic phosphorus accumulating bacteria to keep living in an anaerobic environment, and the other part of the energy can be used for the phosphorus accumulating bacteria to actively absorb VFAs (fatty acid residues), and store PHB (carbon source) required by the phosphorus accumulating bacteria in the sludge.
And S20, introducing the intermediate water body into the biological membrane unit for purification treatment to obtain a purified water body.
Further, the biofilm unit comprises a carbon-nitrogen biofilm unit and a denitrification biofilm unit, and the step S20 comprises steps S21 to S22, as shown in fig. 4 d.
And S21, introducing the intermediate water body into the carbon-nitrogen biological film unit for ammonia and nitrogen removal treatment to obtain a primary purified water body.
Specifically, the carbon-nitrogen biofilm unit comprises at least one carbon-nitrogen biofilm tank 1, a first filler is filled in each carbon-nitrogen biofilm tank 1, the carbon-nitrogen biofilm tank 1 is in an aerobic environment, aerobic bacteria are attached to the outer surface of the first filler and grow into a biofilm, the middle water body is introduced into the carbon-nitrogen biofilm tank 1, the residual COD and ammonia nitrogen in the middle water body are removed through metabolic action of the aerobic bacteria, and the primary purified water body is obtained.
And S22, introducing the primary purified water body into the denitrification biomembrane unit for denitrification treatment to obtain the purified water body.
Specifically, the denitrification biofilm unit comprises at least one denitrification biofilm tank 3, each denitrification biofilm tank 3 is filled with a second filler, the denitrification biofilm tank 3 is in an anoxic environment, anaerobic bacteria such as denitrifying bacteria grow on the outer surface of the second filler in an irradiation mode to form a biofilm, the primary purified water body is introduced into the denitrification biofilm tank 3, and the denitrifying bacteria reduce nitrogen in nitrate and nitrite remaining in the primary purified water body into nitrogen to be removed, so that the purified water body is obtained.
The application sewage treatment system, communicate the biomembrane unit behind the pretreatment unit, under the condition of reforming transform the application to current reaction tank, need not stop production, do not exert an influence to sewage treatment plant's normal operating, process flow is simple, and sewage treatment's effect also can obtain the guarantee.
The sewage treatment method can carry out dual ammonia nitrogen removal and denitrification treatment on the sewage, and has higher treatment strength and better treatment effect.
Example 3
As shown in FIG. 5, a sewage treatment system comprises a pretreatment unit and a biological membrane unit which are communicated with each other.
The pretreatment unit is provided with a water inlet, sewage is introduced into the pretreatment unit through the water inlet for treatment to obtain an intermediate water body, and the intermediate water body is introduced into the biological membrane unit; the biological membrane unit comprises a carbon nitrogen biological membrane unit and/or a denitrification biological membrane unit, and the introduced intermediate water body is purified in the biological membrane unit to obtain a purified water body.
Wherein the pretreatment unit comprises a first biological reaction tank 8. First biological reaction pond 8 through the pipeline with multistage biomembrane unit intercommunication carry out homogenization treatment, primary sedimentation treatment, biodegradable processing and secondary sedimentation treatment with the sewage that lets in first biological reaction pond 8, obtain water in the middle of the biological reaction, and will water in the middle of the biological reaction lets in extremely in the biomembrane unit.
The first biological reaction tank 8 can be an SBR reaction tank which integrates functions of homogenization, primary sedimentation, biodegradation, secondary sedimentation and the like in a first tank, has no sludge backflow system and is particularly suitable for occasions with intermittent discharge and large flow change.
The operation of the SBR reaction tank comprises 5 processes of inflow, reaction, precipitation, discharge, standby and the like. When sewage flows in, high-concentration activated sludge mixed liquor remains in the SBR reaction tank, aeration is carried out while sewage is introduced, and the sludge can be regenerated and recovered to the activity for nitrogen and phosphorus removal. The aeration time is 6-12 hours, COD in the sewage can be removed, a good denitrification and dephosphorization effect is achieved, after the aeration is stopped, the SBR reaction tank is in an anaerobic or anoxic state, and the SBR reaction tank is slowly stirred to carry out denitrification treatment. After the aeration and the stirring are stopped, the water body is in a static state, and the activated sludge is separated from the water. The time adopted in the precipitation process is basically the same as that of a secondary precipitation tank, and is generally 1.5-2.0 h. And introducing supernatant generated after precipitation into a biological membrane unit for subsequent treatment. A part of the activated sludge remains in the reactor as seed sludge. After the water body in the reaction tank is discharged, the reactor is in a stagnation state and waits for the beginning of the next operation period.
The biological membrane unit comprises a carbon-nitrogen biological membrane unit and/or a denitrification biological membrane unit, namely the biological membrane unit can be the carbon-nitrogen biological membrane unit, can also be the denitrification biological membrane unit, and can also comprise both the carbon-nitrogen biological membrane unit and the denitrification biological membrane unit. For details, refer to embodiment 1, which is not described herein again.
The sewage treatment system of this embodiment adopts SBR reaction tank and biofilm unit to combine together to handle sewage, can effectively improve the treatment effeciency and the removal efficiency of organic matter of difficult degradation waste water, restrain the filamentous fungus inflation, the dephosphorization denitrogenation is thorough, process flow is simple.
Example 4
As shown in FIG. 6, a sewage treatment system comprises a pretreatment unit and a biological membrane unit which are communicated with each other.
The pretreatment unit is provided with a water inlet, sewage is introduced into the pretreatment unit through the water inlet for treatment to obtain an intermediate water body, and the intermediate water body is introduced into the biological membrane unit; the biological membrane unit comprises a carbon nitrogen biological membrane unit and/or a denitrification biological membrane unit, and the introduced intermediate water body is purified in the biological membrane unit to obtain a purified water body.
Wherein the pretreatment unit comprises a second biological reaction tank 9. The second biological reaction tank 9 is communicated with the multistage biological membrane unit through a pipeline, the introduced sewage is subjected to aeration treatment in the second biological reaction tank 9 to obtain an aeration intermediate water body, and the aeration intermediate water body is introduced into the biological membrane unit.
The second biological reaction tank 9 may be a continuous loop type reaction tank (oxidation ditch) in which sewage is continuously circulated through a closed aeration channel, the sewage is pretreated by an oxidation ditch process, the oxidation ditch has an obvious dissolved oxygen concentration gradient and is completely mixed as a whole, while the liquid flow keeps plug flow and advances, and the aeration device is positioned, so that the dissolved oxygen concentration of the water body in the aeration zone is high at the upstream and then gradually decreases along the length of the ditch, the obvious concentration gradient appears, and the dissolved oxygen concentration is very low at the downstream and is basically in an anoxic state. The design of the oxidation ditch can arrange the aerobic zone and the anoxic zone according to requirements to realize nitrification and denitrification treatment, not only can utilize the oxygen in the nitrate to meet certain oxygen demand, but also can supplement the alkalinity consumed in the nitrification process through denitrification, thereby achieving the purposes of nitrogen and phosphorus removal.
The biological membrane unit comprises a carbon-nitrogen biological membrane unit and/or a denitrification biological membrane unit, namely the biological membrane unit can be the carbon-nitrogen biological membrane unit, can also be the denitrification biological membrane unit, and can also comprise both the carbon-nitrogen biological membrane unit and the denitrification biological membrane unit. For details, refer to embodiment 1, which is not described herein again.
The sewage treatment system of this embodiment adopts oxidation ditch technology and biomembrane unit to combine together to handle sewage, can be on the basis of guaranteeing sewage treatment efficiency and effect, effective energy saving.
Test example 1
Adopt this application embodiment 2 sewage treatment system to handle sewage, in this test example, the biomembrane unit includes carbon nitrogen biomembrane unit and denitrification biomembrane unit that communicates in proper order. Before treatment, after pretreatment unit treatment and after biofilm unit treatment, the concentrations of COD, ammonia nitrogen and total nitrogen in the initial sewage and the purified water body are respectively detected, and the results shown in table 1 are obtained.
TABLE 1
Therefore, the sewage treatment system provided by the application has the advantages that the removal rates of COD (chemical oxygen demand), ammonia nitrogen and total nitrogen in the sewage respectively reach 40%, 70% and 33% through the carbon-nitrogen biomembrane unit and the denitrification biomembrane unit which are sequentially communicated, and the treatment effect is good.
Test example 2
Adopt this application embodiment 2 sewage treatment system handles sewage in to certain foul water river course, in this test example, the biomembrane unit is carbon nitrogen biomembrane unit, and this carbon nitrogen biomembrane unit includes two carbon nitrogen biomembrane ponds 1 that communicate. Before treatment, after pretreatment unit treatment and after biofilm unit treatment, the concentrations of COD, suspended matters, ammonia nitrogen and total nitrogen in the initial sewage and the purified water body are respectively detected, and the results shown in Table 2 are obtained.
TABLE 2
Therefore, the sewage treatment system provided by the application has the advantages that the removal rates of COD (chemical oxygen demand), suspended matters, ammonia nitrogen and total nitrogen in sewage are respectively 40%, 33%, 70% and 33% by arranging the two-stage carbon-nitrogen biomembrane units which are sequentially communicated, and the treatment effect is good.
In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.
In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree and order of importance, the premise that each other exists, and the like.
In this context, "equal", "same", etc. are not strictly mathematical and/or geometric limitations, but also include tolerances as would be understood by a person skilled in the art and allowed for manufacturing or use, etc.
Unless otherwise indicated, numerical ranges herein include not only the entire range within its two endpoints, but also several sub-ranges subsumed therein.
The preferred embodiments and examples of the present application have been described in detail with reference to the accompanying drawings, but the present application is not limited to the embodiments and examples described above, and various changes can be made within the knowledge of those skilled in the art without departing from the concept of the present application.
Claims (9)
1. A sewage treatment system comprising a biofilm unit;
the biological membrane unit comprises a carbon nitrogen biological membrane unit and/or a denitrification biological membrane unit, and the introduced water body is purified in the biological membrane unit to obtain the purified water body.
2. The sewage treatment system of claim 1, further comprising a pretreatment unit comprising an anaerobic tank (4), an anoxic tank (5), an aerobic tank (6) and a secondary sedimentation tank (7) which are sequentially communicated;
the anaerobic tank (4) is communicated with the anoxic tank (5) through a pipeline, the introduced sewage is subjected to anaerobic treatment in the anaerobic tank (4) to obtain a first intermediate water body, and the first intermediate water body is introduced into the anoxic tank (5);
the anoxic tank (5) is connected between the anaerobic tank (4) and the aerobic tank (6) through a pipeline, the first intermediate water body introduced into the anoxic tank (5) is subjected to anoxic treatment to obtain a second intermediate water body, and the second intermediate water body is introduced into the aerobic tank (6);
the aerobic tank (6) is connected between the anoxic tank (5) and the secondary sedimentation tank (7) through a pipeline, the second intermediate water body introduced into the aerobic tank (6) is subjected to aerobic treatment to obtain a third intermediate water body, 40-60% of the third intermediate water body is introduced into the anoxic tank (5), and the rest of the third intermediate water body is introduced into the secondary sedimentation tank (7);
the secondary sedimentation tank (7) is communicated with the aerobic tank (6) through a pipeline, a third intermediate water body introduced into the secondary sedimentation tank (7) is subjected to sedimentation treatment to obtain sludge and an intermediate water body, the sludge is introduced into the anaerobic tank (4), and the intermediate water body is introduced into the biological membrane unit.
3. The wastewater treatment system according to claim 1, further comprising a pretreatment unit comprising a first biological reaction tank (8);
first biological reaction pond (8) pass through the pipeline with the biomembrane unit intercommunication carry out homogenization treatment, primary sedimentation treatment, biodegradable processing and secondary sedimentation treatment with the sewage that lets in first biological reaction pond (8), obtain water in the middle of the biological reaction, and will water in the middle of the biological reaction lets in to in the biomembrane unit.
4. The wastewater treatment system according to claim 1, further comprising a pretreatment unit comprising a second biological reaction tank (9);
the second biological reaction tank (9) is communicated with the biological membrane unit through a pipeline, the fed sewage is aerated in the second biological reaction tank (9) to obtain an aerated intermediate water body, and the aerated intermediate water body is fed into the biological membrane unit.
5. The wastewater treatment system of claim 1, wherein the biofilm unit is a carbon nitrogen biofilm unit;
and carrying out ammonia nitrogen removal treatment on the introduced water body in the carbon nitrogen biological film unit to obtain the purified water body.
6. The wastewater treatment system of claim 1, wherein the biofilm unit is a denitrification biofilm unit;
and carrying out denitrification treatment on the introduced water body in the denitrification biomembrane unit to obtain the purified water body.
7. The wastewater treatment system of claim 1, wherein the biofilm unit comprises a carbon nitrogen biofilm unit and a denitrification biofilm unit in communication;
the carbon-nitrogen biological membrane unit is connected with the denitrification biological membrane unit through a pipeline, the introduced water body is subjected to ammonia nitrogen removal treatment in the carbon-nitrogen biological membrane unit to obtain a primary purified water body, and the primary purified water body is introduced into the denitrification biological membrane unit;
and the denitrification biomembrane unit is communicated with the carbon-nitrogen biomembrane unit through a pipeline, and the introduced primary purified water body is subjected to denitrification treatment in the denitrification biomembrane unit to obtain the purified water body.
8. Sewage treatment system according to claim 5 or 7, characterised in that said carbon nitrogen biofilm unit comprises at least one carbon nitrogen biofilm tank (1);
the carbon-nitrogen biological membrane tank is characterized in that a first filler is arranged in the carbon-nitrogen biological membrane tank (1), an aeration pipeline (2) and a water inlet pipeline are arranged at the bottom of the carbon-nitrogen biological membrane tank, gas is introduced into the carbon-nitrogen biological membrane tank (1) through the aeration pipeline (2), and an intermediate water body is introduced into the carbon-nitrogen biological membrane tank (1) through the water inlet pipeline for treatment to obtain a purified water body or a primary purified water body.
9. The wastewater treatment system according to claim 6 or 7, wherein the denitrification biofilm unit comprises at least one denitrification biofilm tank (3);
and a second filler is arranged in the denitrification biomembrane pond (3), a water inlet pipeline is arranged at the bottom of the denitrification biomembrane pond, and a water body is introduced into the denitrification biomembrane pond (3) through the water inlet pipeline for denitrification treatment to obtain the purified water body.
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