CN115571979B - Municipal sewage purification method based on biological treatment - Google Patents
Municipal sewage purification method based on biological treatment Download PDFInfo
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- CN115571979B CN115571979B CN202211455231.2A CN202211455231A CN115571979B CN 115571979 B CN115571979 B CN 115571979B CN 202211455231 A CN202211455231 A CN 202211455231A CN 115571979 B CN115571979 B CN 115571979B
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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
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
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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
- C02F3/006—Regulation methods for biological treatment
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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
- C02F3/10—Packings; Fillings; Grids
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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
- C02F7/00—Aeration of stretches of water
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention relates to a municipal sewage purification method based on biological treatment, which relates to the field of sewage treatment and comprises the following steps of S1, injecting municipal sewage into an intermediate purification chamber of the municipal sewage in the current region through a pipeline for primary treatment, wherein the municipal sewage is injected into a plurality of sludge reaction units through an interception net in the intermediate purification chamber for primary purification; s2, the sewage treatment control platform obtains the treatment time of the sewage treatment chambers for carrying out centralized treatment on the urban sewage according to the treatment efficiency of each intermediate purification chamber, and if the treatment efficiency of each intermediate purification chamber does not accord with a preset standard, the sewage treatment control platform prolongs the treatment time of the sewage in the sewage treatment chambers so as to enable the sewage discharge to accord with the standard; and S3, detecting the urban sewage discharged in the step S2 by the sewage treatment control platform, and adjusting the preset treatment time and the rotation rate of the biofilm reactor according to the detection result so as to enable the discharged sewage to meet the discharge requirement.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a municipal sewage purification method based on biological treatment.
Background
The urban sewage treatment is generally divided into three stages: first-stage treatment, namely removing insoluble pollutants and parasitic ova in the sewage by using a physical treatment method; the second-stage treatment is to apply a biological treatment method to oxidize and degrade various complex organic matters in the sewage into simple substances; the third-stage treatment is to remove phosphorus, nitrogen, refractory organic matters, inorganic salts and the like in the sewage by applying a chemical precipitation method, a biochemical method, a physicochemical method and the like. With the acceleration of urbanization process, the problem of water pollution in China is becoming more serious, however, the current construction of sewage treatment facilities mainly focuses on urban sewage treatment plants, sewage in various areas of cities is conveyed to the sewage treatment plants through pipelines for centralized treatment and discharge, but the efficiency of the centralized treatment of sewage is low, and the sewage treatment is not thorough, so that the discharge does not reach the standard.
Chinese patent CN 103755108B discloses a purification treatment method for municipal domestic sewage, which designs a technical scheme for realizing that the discharged water quality reaches the standard by sequentially performing a pretreatment step, a biological reaction step, a filtration step, a sterilization step and an adsorption step, but still does not solve the problem of how to perform intermediate treatment on the municipal sewage to achieve the purpose of high efficiency of sewage treatment.
Disclosure of Invention
Therefore, the invention provides a municipal sewage purification method based on biological treatment, which can solve the technical problem that the efficiency of sewage treatment cannot be improved by decentralized and shunt treatment of municipal sewage.
In order to achieve the above object, the present invention provides a method for purifying municipal sewage based on biological treatment, comprising:
step S1, urban sewage is injected into an intermediate purification chamber of the urban sewage in the current region through a pipeline for primary treatment, wherein the urban sewage is injected into a plurality of sludge reaction units for primary purification through a retention net in the intermediate purification chamber, the sludge reaction units of each intermediate purification chamber comprise a plurality of main sludge reactors and a plurality of auxiliary sludge reactors, and an aeration mechanism capable of controlling aeration intensity and aeration range is arranged in each sludge reactor;
s2, the sewage treatment control platform acquires the treatment time of a sewage treatment chamber for carrying out centralized treatment on the urban sewage according to the treatment efficiency of each intermediate purification chamber, if the treatment efficiency of each intermediate purification chamber does not meet a preset standard, the sewage treatment control platform prolongs the treatment time of the sewage in the sewage treatment chamber so as to enable the sewage discharge to meet the standard, and the sewage treatment chamber is provided with a rotary biofilm reactor;
and S3, detecting the urban sewage discharged in the step S2 by the sewage treatment control platform, and adjusting the preset treatment time and the rotation rate of the biofilm reactor according to the detection result so as to enable the discharged sewage to meet the discharge requirement.
Further, in the step S1, the municipal sewage is divided into a plurality of areas according to the treatment amount of the municipal sewage, each area is provided with an intermediate purification chamber, the sewage treatment control platform sets the number of sludge reactors according to the daily treatment amount m of the municipal sewage in the current area, so that each intermediate purification chamber can carry out preliminary treatment on the municipal sewage in the current area,
when M is less than or equal to M1, the sewage treatment control platform selects a first preset number N1 as the starting number of the sludge reactors in the intermediate purification chamber in the current region;
when M1 is larger than M and smaller than M2, the sewage treatment control platform selects a second preset number N2 as the starting number of the sludge reactors in the intermediate purification chamber in the current region;
when M is larger than or equal to M2, the sewage treatment control platform selects a third preset number N3 as the starting number of the sludge reactors in the intermediate purification chamber in the current region;
the sewage treatment control platform presets daily sewage treatment amount M, sets first preset daily sewage treatment amount M1, second preset daily sewage treatment amount M2, third preset daily sewage treatment amount M3 and preset amount N, sets first preset amount N1, second preset amount N2 and third preset amount N3, wherein 3/4Ni is the number of main sludge reactors, 1/4Ni is the number of auxiliary sludge reactors, and i =1,2,3.
Further, the intermediate purification chamber arranges the activated sludge concentration of each sludge reactor in order from large to small to determine main activated sludge reactors, and the intermediate purification chamber determines the sewage injection amount of each main activated sludge reactor according to the activated sludge concentration c of the main activated sludge reactors, wherein,
when C is less than or equal to C1, the injection amount of V1 is set as the sewage injection amount injected into the current main sludge reactor by the intermediate purification chamber;
when C1 is more than C and less than C2, the injection amount of V2 is set as the sewage injection amount injected into the current main sludge reactor by the intermediate purification chamber;
when C is larger than or equal to C2, the injection amount of V3 is set as the sewage injection amount injected into the current main sludge reactor by the intermediate purification chamber;
the intermediate purification chamber is preset with activated sludge concentration C, a first preset activated sludge concentration C1, a second preset activated sludge concentration C2, a preset injection amount V, a first preset injection amount V1, a second preset injection amount V2 and a third preset injection amount V3.
Further, under a first preset condition, the intermediate clean room adjusts the sewage injection amount and the composite microorganism input amount of the current main sludge reactor according to the sludge age Y in the main sludge reactor, wherein the sludge age in the current main sludge reactor is less than or equal to the first preset sludge age, the intermediate clean room adjusts the sewage injection amount Vj of the current main sludge reactor to Vj1, and sets Vj1= Vj × k1, wherein k1=1+ (Y1-Y)/Y1, and adjusts the composite microorganism input amount w to w1, and sets w1= w × 1.25, the sludge age in the current main sludge reactor is greater than the preset sludge age, the intermediate clean room adjusts the sewage injection amount Vj of the current main sludge reactor to Vj2, and sets Vj2= Vj × k2, wherein k2=1 is 0.5 × 0.5 (Y-Y1)/Y1, the current sewage concentration of the current main sludge reactor is greater than or equal to the second preset sludge concentration, and the current sludge concentration of the current main sludge reactor is less than the preset sludge concentration of the current sludge concentration of the urban sewage treatment area, and the current sludge treatment area is less than the preset sludge treatment area.
Further, under a second preset condition, the intermediate purification chamber adjusts the sewage injection amount and the aeration intensity of the current main sludge reactor according to the sludge age Y in the main sludge reactor, wherein if the sludge age Y in the current main sludge reactor of the intermediate purification chamber is less than or equal to a second preset sludge age Y2, the intermediate purification chamber adjusts the sewage injection amount Vj of the current main sludge reactor to Vj3, sets Vj3= Vj × k3, sets k3= 1.2 × (Y2-Y)/Y2, and simultaneously injects a fixed amount of nutrient into the current main sludge reactor, if the sludge age Y in the current main sludge reactor of the intermediate purification chamber is greater than the second preset sludge age Y2, the intermediate purification chamber lowers the aeration intensity A0 to A1 of the current main sludge reactor, sets A1= A0 × k4, sets k4=1- (Y-Y2)/Y2, wherein A0 is a preset aeration intensity standard value, the second preset aeration intensity standard value is that the sewage concentration of the current main sludge reactor is less than the current sewage concentration of the main sludge reactor, and the sewage treatment active sludge concentration of the current main sludge reactor is less than the second preset sewage treatment sludge concentration.
Further, the intermediate purification chamber adjusts the aeration intensity of each main sludge reactor according to the comparison between the sewage injection amount Vjp of each main sludge reactor and a preset injection amount standard value v0, wherein,
when Vjp < v0- Δ v, the intermediate clean room reduces the current aeration intensity Ae of the main sludge reactor to Ae1, setting Ae1= Ae x (1- (v 0- Δ v-Vjp)/v 0);
when v 0-delta v is not less than Vjp is not less than v0 plus delta v, the middle purifying chamber does not adjust the aeration intensity of the current main sludge reactor;
when Vjp > v0 +. DELTA.v, the middle purification chamber increases the current aeration intensity Ae of the main sludge reactor to Ae2, sets Ae2= Ae x (1 + (Vjp-v 0-DELTA.v)/v 0), and simultaneously increases the moving speed of the aerator by increasing the power parameter of the power mechanism in the sliding unit;
wherein, Δ v is a preset sewage treatment capacity error value of the intermediate purification chamber, and p =1,2,3, e =0,1.
Further, in the step S2, the sewage treatment control platform compares the treatment efficiency D0 of the intermediate purification chamber with a preset treatment efficiency D, and the sewage treatment chamber selects a sewage treatment time, wherein,
when D0 is less than or equal to D1, the sewage treatment chamber selects a first preset treatment time T1 as sewage treatment time;
when D1 is more than D0 and less than D2, the sewage treatment chamber selects a second preset treatment time T2 as sewage treatment time;
when D0 is more than or equal to D2, selecting a third preset treatment time T3 as the sewage treatment time in the sewage treatment chamber;
the sewage treatment room is used for presetting treatment efficiency D, setting first preset treatment efficiency D1, second preset treatment efficiency D2, presetting treatment time T, setting first preset treatment time T1, second preset treatment time T2 and third preset treatment time T3.
Further, the sewage treatment control platform sets the intermediate purification chamber treatment efficiency d0 according to the average treatment efficiency value of each intermediate purification chamber, and sets d0= (d 1+ d2+ \8230; + dn)/n, wherein d1 is the treatment efficiency of the first intermediate purification chamber, d2 is the treatment efficiency of the second intermediate purification chamber \8230;, dn is the treatment efficiency of the nth intermediate purification chamber, n is a natural number greater than or equal to 2, which represents the number of intermediate purification chambers, and dx = (vx '-v 0)/v 0, wherein vx' is the actual sewage injection amount of the xth intermediate purification chamber, x =1,2 \8230; \8230n.
Further, in the step S3, the sewage treatment control platform obtains a COD value S of the discharged sewage and compares the COD value S with a preset COD standard value S, and adjusts the preset treatment time of the sewage treatment chamber, wherein if S-S is greater than or equal to a second preset error value Δ S2, the sewage treatment control platform does not adjust the preset treatment time, and if S-S is greater than a first preset error value Δ S1 and is less than a second preset error value Δ S2, when the sewage treatment control platform determines to prolong the preset treatment of the sewage treatment chamber, if S-S is less than or equal to the first preset error value Δ S1, the sewage treatment control platform determines to prolong the preset treatment time of the sewage treatment chamber, and simultaneously, increases the rotation rate of the biofilm reactor in the sewage treatment chamber.
Further, the difference value between the preset COD standard value S of the sewage treatment control platform and the COD value S of the sewage discharged by the sewage treatment control platform is larger than a first preset error value Delta S1 and is smaller than a second preset error value Delta S2, the sewage treatment control platform judges that the preset treatment time Tu of the sewage treatment chamber is prolonged to Tu1, and Tu1= Tux (1 + (. DELTA.s 2-S + S) × (S-S-Delta S1)/(. DELTA.s 1 ×. DELTA.s 2)), the difference value between the preset COD standard value S of the sewage treatment control platform and the COD value S of the sewage discharged by the sewage treatment control platform is smaller than or equal to a first preset error value Delta S1, the sewage treatment control platform judges that the preset treatment time Tu of the sewage treatment chamber is prolonged to Tu2, tu2= Tux (1 + (S-S-Delta S1)/[ Delta S1) is set, meanwhile, the rotation speed f of the biofilm reactor in the sewage treatment chamber is increased to f1, and f1= f x (1 + (S-S-Delta S1)/[ Delta S1) is set, wherein u =1,2,3.
Compared with the prior art, the invention has the advantages that the municipal sewage is divided into a plurality of areas for preliminary treatment, the difficulty of municipal sewage treatment is reduced, and the sewage treatment efficiency is improved, therefore, each sewage treatment area is provided with an intermediate purification chamber, a plurality of sludge reactors are arranged in the intermediate purification chamber, the sludge reactors are divided into a main sludge reactor for sewage treatment in a time period when the sewage amount is excessive and a secondary sludge reactor for sewage treatment in a time period when the sewage amount is less, the sludge reactors are convenient to be alternately used, the sludge activity of the sludge reactors for sewage treatment is improved, the fertility of microorganisms in the sludge is maintained, the efficiency of municipal sewage treatment is improved, and the sewage treated by each intermediate purification chamber carries beneficial microorganisms in the sludge reactors, so that the time for preliminary sewage treatment is prolonged.
Particularly, the invention is provided with daily sewage treatment capacity, the daily sewage treatment capacity of the current area is compared with the preset daily sewage treatment capacity to determine the starting number of the sludge reactors so that the intermediate purification chamber can carry out primary treatment on sewage generated in the current area every day, wherein if the daily sewage treatment capacity is slightly smaller, a smaller starting number of the sludge reactors is selected so that sludge in other sludge reactors can rest for later sewage treatment, if the daily sewage treatment capacity is larger, a larger starting number of the sludge reactors is selected so that sewage can be efficiently treated, meanwhile, the invention is provided with a main sludge reactor and a secondary sludge reactor, the activated sludge concentration of the sludge reactors is arranged in a descending order, a larger activated sludge concentration is selected as the main sludge reactor to carry out primary treatment on sewage in the day, a smaller activated sludge concentration is selected as the secondary sludge reactor at the same time, the rest time in the day is used as the propagation time of the sludge reactors so as to improve the activated sludge concentration of the secondary sludge reactors for treating sewage generated in the night, and the activated sludge concentration generated in the secondary sludge reactors is compared with the main sludge concentration generated in the night, the current sewage treatment capacity, and the activated sludge concentration of the primary sludge reactor is determined according to the current activated sludge reaction, the higher sludge concentration of the current sewage in each secondary sludge reactor.
Particularly, when the active sludge concentration of the current main sludge reactor is determined to be greater than or equal to a second preset active sludge concentration, and the sum of the sewage injection amount of the main sludge reactor is smaller than the current urban daily sewage treatment amount, namely the active sludge concentration of the main sludge reactor is higher, but the current daily sewage treatment amount cannot be treated, the intermediate purification chamber adjusts the sewage injection amount and the composite microorganism injection amount of the current main sludge reactor according to the sludge age Y in the main sludge reactor to properly reduce the active sludge concentration and ensure the normal propagation of the active sludge, wherein the sludge age in the current main sludge reactor is less than or equal to a first preset sludge age Y1, the intermediate purification chamber improves the sewage injection amount and the composite microorganism injection amount of the current main sludge reactor to meet the daily sewage treatment amount, simultaneously improves the sludge age to ensure the primary treatment of the current main sludge reactor on the sewage, the sludge age in the current main sludge reactor is greater than the first preset sludge age Y1, and indicates that the current preset injection amount accords with the current sewage treatment capacity of the main sludge reactor, and therefore the sewage injection amount of the intermediate purification chamber is increased.
Particularly, the invention is under the second preset condition that the concentration of the active sludge in the current main sludge reactor is too low, but each sludge reactor can finish the primary treatment of the sewage, the intermediate purification chamber adjusts the sewage injection amount and the aeration intensity of the current main sludge reactor according to the sludge age in the main sludge reactor so as to adjust the environment of the current main sludge reactor, wherein if the sludge age in the current main sludge reactor of the intermediate purification chamber is less than or equal to the second preset sludge age, the sewage injection amount of the main sludge reactor is increased, meanwhile, nutrient is injected into the current main sludge reactor so as to increase the sludge age, and if the sludge age in the current main sludge reactor of the intermediate purification chamber is greater than the second preset sludge age, the aeration intensity of the current main sludge reactor is decreased so as to decrease the sludge age.
Particularly, the present invention adjusts the aeration intensity in each main sludge reactor according to the comparison between the sewage injection amount of each main sludge reactor and the preset injection amount, so that the aeration intensity in each main sludge reactor is matched with the sewage injection amount in the sludge reactor, and when the sewage injection amount exceeds the sum of the preset injection amount standard value and the error value, the intermediate purification chamber increases the aeration intensity of the main sludge reactor and the movement rate of the aerator, so as to increase the oxygen content and the oxygen uniformity degree in the main sludge reactor in a wider range, and ensure the sewage treatment efficiency.
Particularly, the invention sets the ratio of the actual sewage injection amount of each intermediate purifying chamber, namely the difference value between the regulated sewage injection amount and the preset sewage injection amount standard value, to the sewage injection amount standard value as the treatment efficiency of each intermediate purifying chamber, sets the average value of the treatment efficiency of each total intermediate purifying chamber as the treatment efficiency of the intermediate purifying chamber, compares the treatment efficiency of the intermediate purifying chamber with the U preset treatment efficiency, and selects the optimal treatment time as the treatment time of the sewage treatment chamber to meet the treatment effect on the sewage, wherein the larger the acquired treatment efficiency value is, the longer the treatment time is selected to avoid the condition that the initial treatment of the sewage does not meet the standard due to the increase of the sludge activity concentration and the increase of the sewage injection amount, and the smaller the acquired treatment efficiency value is, the shorter the treatment time is selected to enable the sewage discharge after the sewage treatment to meet the standard.
Particularly, the invention carries out COD detection on the discharged treated sewage, if the detection result does not meet the standard, the preset treatment time is prolonged according to the detection result so that the detection result of the discharged sewage meets the standard, and if the difference between the detection result and the preset standard value is overlarge, the rotation speed of the biomembrane reactor is improved on the basis of prolonging the treatment time so as to accelerate the sewage treatment efficiency.
Drawings
FIG. 1 is a schematic diagram of a municipal sewage purification method based on biological treatment according to an embodiment of the invention;
FIG. 2 is a schematic diagram showing the structure of an intermediate purification chamber with 20 sludge reactors according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a sludge reactor according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a sewage treatment chamber according to an embodiment of the invention;
FIG. 5 is a schematic view of a structure of municipal sewage purification based on biological treatment according to an embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a schematic diagram of a method for purifying municipal sewage based on biological treatment according to an embodiment of the present invention includes,
step S1, urban sewage is injected into an intermediate purification chamber of the urban sewage in the current region through a pipeline for primary treatment, wherein the urban sewage is injected into a plurality of sludge reaction units for primary purification through a retention net in the intermediate purification chamber, the sludge reaction unit of each intermediate purification chamber comprises a plurality of main sludge reactors and a plurality of auxiliary sludge reactors, and an aeration mechanism capable of controlling aeration intensity and aeration range is arranged in each sludge reactor;
s2, the sewage treatment control platform acquires the treatment time of a sewage treatment chamber for carrying out centralized treatment on the urban sewage according to the treatment efficiency of each intermediate purification chamber, if the treatment efficiency of each intermediate purification chamber does not meet a preset standard, the sewage treatment control platform prolongs the treatment time of the sewage in the sewage treatment chamber so as to enable the sewage discharge to meet the standard, and the sewage treatment chamber is provided with a rotary biofilm reactor;
and S3, detecting the urban sewage discharged in the step S2 by the sewage treatment control platform, and adjusting the preset treatment time and the rotation rate of the biofilm reactor according to the detection result so as to enable the discharged sewage to meet the discharge requirement.
The municipal sewage is divided into a plurality of areas for preliminary treatment, the municipal sewage treatment difficulty is reduced, and the sewage treatment efficiency is improved, so that an intermediate purification chamber is arranged in each sewage treatment area, a plurality of sludge reactors are arranged in the intermediate purification chamber, the sludge reactors are divided into a main sludge reactor for performing sewage treatment in a time period when the sewage amount is excessive and a secondary sludge reactor for performing sewage treatment in a time period when the sewage amount is less, the sludge reactors can be used alternately, the sludge activity of each sludge reactor for treating the sewage is improved, the fertility of microorganisms in the sludge is maintained, the efficiency of municipal sewage treatment is improved, the sewage treated by each intermediate purification chamber carries beneficial microorganisms in the sludge reactors, and the time for preliminary sewage treatment is prolonged.
Specifically, in the step S1, the municipal sewage is divided into a plurality of areas according to the treatment amount of the municipal sewage, each area is provided with an intermediate purification chamber, the sewage treatment control platform sets the number of sludge reactors according to the daily treatment amount m of the municipal sewage in the current area, so that each intermediate purification chamber performs primary treatment on the municipal sewage in the current area,
when M is less than or equal to M1, the sewage treatment control platform selects a first preset number N1 as the starting number of the sludge reactors in the intermediate purification chamber in the current region;
when M1 is larger than M and smaller than M2, the sewage treatment control platform selects a second preset number N2 as the starting number of the sludge reactors in the intermediate purification chamber in the current region;
when M is larger than or equal to M2, the sewage treatment control platform selects a third preset number N3 as the starting number of the sludge reactors in the middle purifying chamber in the current region;
the sewage treatment control platform presets daily sewage treatment amount M, sets first preset daily sewage treatment amount M1, second preset daily sewage treatment amount M2, third preset daily sewage treatment amount M3, preset amount N, sets first preset amount N1, second preset amount N2 and third preset amount N3, wherein 3/4Ni is the number of main sludge reactors, 1/4Ni is the number of auxiliary sludge reactors, and i =1,2,3.
Specifically, the method for dividing the municipal sewage treatment into a plurality of areas is not limited in the embodiment of the present invention, and needs to be set according to the treatment capacity, treatment difficulty, administrative division and geographical location of the municipal sewage, and the conditions of the municipal sewage in different areas are different, the embodiment of the present invention does not limit the daily treatment capacity of the preset sewage, which needs to be set according to the treatment scale of the sludge reactor and the treatment difficulty of the municipal sewage in the current area, and the embodiment of the present invention provides a preferred embodiment, wherein the daily sewage treatment capacity M of the sewage treatment control platform is set to be 0.5-1 ten thousand tons, wherein the first preset daily sewage treatment capacity M is 0.5 ten thousand tons, the second preset daily sewage treatment capacity M2 is 1 ten thousand tons, the method comprises the steps of enabling a preset number N to be 4-12, enabling a first preset number to be 4, a second preset number to be 8 and a third preset number to be 12, enabling the average daily sewage treatment capacity of a current region to be 0.8 ten thousand tons, enabling 75% of treatment capacity to be daily treatment capacity and 25% of treatment capacity to be night treatment capacity, enabling the daily sewage treatment capacity to be between the first preset daily sewage treatment capacity and the second preset daily sewage treatment capacity, selecting the second preset number 8 as the starting number of sludge reactors of a middle purification room of the current region, enabling the starting number of main sludge reactors to be 6 and enabling the starting number of auxiliary sludge reactors to be 2, enabling the main sludge reactors to be used for treating sewage produced in the daytime and enabling the auxiliary sludge reactors to be used for treating sewage produced at night.
Particularly, the intermediate purification chamber in the embodiment of the invention is provided with a plurality of sludge reactors, and the sludge reactors are divided into a main sludge reactor for sewage treatment in a time period when the amount of sewage is excessive and a secondary sludge reactor for sewage treatment in a time period when the amount of sewage is less, so that the sludge reactors can be alternately used, and the efficiency of urban sewage treatment can be improved.
Please refer to fig. 2, which is a schematic diagram of a structure of an intermediate purification chamber with 20 sludge reactors according to an embodiment of the present invention, including a water inlet pipe 21, a first sludge reactor 1, a second sludge reactor 2, a third sludge reactor 3, a fourth sludge reactor 4, a fifth sludge reactor 5, a sixth sludge reactor 6, a seventh sludge reactor 7, an eighth sludge reactor 8, a ninth sludge reactor 9, a tenth sludge reactor 10, an eleventh sludge reactor 11, a twelfth sludge reactor 12, a thirteenth sludge reactor 13, a fourteenth sludge reactor 14, a fifteenth sludge reactor 15, a sixteenth sludge reactor 16, a seventeenth sludge reactor 17, an eighteenth sludge reactor 18, a nineteenth sludge reactor 19, and a twentieth sludge reactor 20, wherein, the average daily sewage treatment capacity of the current region is 0.8 ten thousand tons, the starting number of the main sludge reactors is 6, the starting number of the auxiliary sludge reactors is 2, the sludge reactors are divided into the main sludge reactor and the auxiliary sludge reactors according to the active sludge concentration in each sludge reactor, more specifically, the active sludge concentrations of the first sludge reactor to the twentieth sludge reactor in the embodiment of the invention are respectively 4000mg/L, 3500mg/L, 2300mg/L, 4200mg/L, 3700mg/L, 2000mg/L, 4000mg/L, 3200mg/L, 4200mg/L, 3300mg/L, 4000mg/L, 3500mg/L, 2200mg/L, 3800mg/L, 3600mg/L, 4100mg/L,2800mg/L, 3300mg/L, 2500mg/L and 3500mg/L, the active sludge concentrations of the sludge reactors are sorted from large to small, and the ninth sludge reactor with the higher active sludge concentration is selected, the fourth sludge reactor, the sixteenth sludge reactor, the eleventh sludge reactor, the seventh sludge reactor and the first sludge reactor are main sludge reactors, and the sixth sludge reactor and the thirteenth sludge reactor with smaller activated sludge concentration are selected as auxiliary sludge reactors.
Wherein the activated sludge concentration of each sludge reactor is arranged in order from big to small to determine a main activated sludge reactor, the intermediate purification chamber determines the sewage injection amount of each main activated sludge reactor according to the activated sludge concentration c of the main activated sludge reactor, wherein,
when C is less than or equal to C1, the injection amount of V1 is set as the sewage injection amount injected into the current main sludge reactor by the intermediate purification chamber;
when C1 is more than C and less than C2, the injection amount of V2 is set as the injection amount of the sewage injected into the current main sludge reactor by the intermediate purification chamber;
when C is larger than or equal to C2, the injection amount of V3 is set as the sewage injection amount injected into the current main sludge reactor by the intermediate purification chamber;
the intermediate purification chamber is preset with activated sludge concentration C, a first preset activated sludge concentration C1, a second preset activated sludge concentration C2, a preset injection amount V, a first preset injection amount V1, a second preset injection amount V2 and a third preset injection amount V3.
Specifically, the invention is provided with daily sewage treatment capacity, the daily sewage treatment capacity of the current area is compared with preset daily sewage treatment capacity, the starting number of the sludge reactors is determined, so that the intermediate purification chamber can carry out primary treatment on sewage generated in the current area every day, if the daily sewage treatment capacity is slightly smaller, a smaller starting number of the sludge reactors is selected, so that sludge in other sludge reactors can rest, so that sewage treatment in a later period is facilitated, if the daily sewage treatment capacity is larger, a larger starting number of the sludge reactors is selected, so that sewage is efficiently treated, meanwhile, the invention is provided with a main sludge reactor and a secondary sludge reactor, the activated sludge concentration of the sludge reactors is arranged in a descending order, a larger activated sludge concentration is selected as the main sludge reactor, so that sewage in the day is primarily treated, a smaller activated sludge concentration is selected as the secondary sludge reactor, the rest time in the day is used as the propagation time of the sludge reactors, so that the activated sludge concentration of the secondary sludge reactors is increased for treating sewage generated in the night, the sewage treatment capacity in the night is compared with the main sludge concentration generated in the main sludge reactor, and the current activated sludge concentration of the primary sludge reactor is determined, and the sewage reaction is performed in the current sewage reaction, so that the activated sludge concentration of the secondary sludge in the secondary sludge reactor is higher.
Specifically, the preset activated sludge concentration is not limited in the embodiments of the present invention, as long as it can perform primary treatment on the sewage in the current region, the embodiments of the present invention provide a preferable numerical reference range, and a parameter of 3500-4500mg/L is used as the activated sludge concentration, that is, a first preset activated sludge concentration of 3500mg/L and a second preset activated sludge concentration of 4500mg/L are set, if the activated sludge concentration of the current main activated sludge reactor is less than 3500mg/L, V1 is injected into the current main sludge reactor to be 0.06 ton of sewage, if the activated sludge concentration of the current main activated sludge reactor is between 3500-4500mg/L, V2 is injected into the current main sludge reactor to be 0.08 ton of sewage, and if the activated sludge concentration of the current main activated sludge reactor is greater than 4500mg/L, V3 is injected into the current main sludge reactor to be 0.1 ton of sewage.
Under a first preset condition, the intermediate purification chamber adjusts the sewage injection amount and the composite microorganism input amount of the current main sludge reactor according to the sludge age Y in the main sludge reactor, wherein the sludge age in the current main sludge reactor is less than or equal to the sludge age of the first preset sludge, the intermediate purification chamber adjusts the sewage injection amount Vj of the current main sludge reactor to Vj1, and sets Vj1= Vj × k1, wherein k1=1+ (Y1-Y)/Y1, and adjusts the composite microorganism input amount w to w1, and sets w1= w × 1.25, the sludge age in the current main sludge reactor is greater than the sludge age of the preset sludge, the intermediate purification chamber adjusts the sewage injection amount Vj of the current main sludge reactor to Vj2, and sets Vj2= Vj × k2, wherein k2=1 is 0.5 × (Y-Y1)/Y1, the first preset condition is that the sewage concentration of the current main sludge reactor is greater than or equal to the sludge concentration of the second preset sludge concentration, and the current sludge concentration of the current sludge in the current main sludge reactor is less than the sludge concentration of the preset sludge treatment area, and the sewage treatment area is less than the sewage treatment area of the preset sludge treatment area.
Specifically, the sludge age is not limited in the embodiment of the invention, and the sludge age can be just the primary treatment of the sewage in the current area, and the embodiment of the invention provides a preferable implementation scheme, and the sludge age of the sewage in common towns is 5-6 days.
Specifically, the embodiment of the present invention does not limit the kind and the active concentration of the complex microorganism, as long as the complex microorganism can be primarily treated according to the property of the sewage in the current area, wherein the kind of the complex microorganism may be one or more of bacillus, photosynthetic bacteria, yeast, actinomycetes, lactic acid bacteria, filamentous fungi, and the like.
Specifically, when the active sludge concentration of the current main sludge reactor is determined to be greater than or equal to a second preset active sludge concentration, and the sum of the sewage injection amount of the main sludge reactor is smaller than the current urban daily sewage treatment amount, namely the active sludge concentration of the main sludge reactor is higher, but the current daily sewage treatment amount cannot be treated, the sewage injection amount and the composite microorganism injection amount of the current main sludge reactor are adjusted by the intermediate purification chamber according to the sludge age Y in the main sludge reactor to properly reduce the active sludge concentration and ensure the normal propagation of the active sludge, wherein the sludge age in the current main sludge reactor is less than or equal to a first preset sludge age Y1, the sludge age in the intermediate purification chamber is increased by increasing the sewage injection amount and the composite microorganism injection amount of the current main sludge reactor to meet the daily sewage treatment amount, the sludge age is increased to ensure the primary treatment of the current main sludge reactor to sewage, and the sludge age in the current main sludge reactor is greater than the first preset sludge age Y1 to indicate that the current preset injection amount conforms to the current sewage treatment capacity of the main sludge reactor, so that the sewage injection amount of the intermediate purification chamber is increased.
Under a second preset condition, the intermediate purification chamber adjusts the sewage injection amount and the aeration intensity of the current main sludge reactor according to the sludge age Y in the main sludge reactor, wherein if the sludge age Y in the current main sludge reactor of the intermediate purification chamber is less than or equal to a second preset sludge age Y2, the intermediate purification chamber adjusts the sewage injection amount Vj of the current main sludge reactor to Vj3, sets Vj3= Vj × k3, sets k3=1+0.2 × (Y2-Y)/Y2, and simultaneously injects a fixed amount of nutrient into the current main sludge reactor, if the sludge age Y in the current main sludge reactor of the intermediate purification chamber is greater than the second preset sludge age Y2, the intermediate purification chamber reduces the current main sludge reactor intensities A0 to A1, sets A1= A0 × k4, sets k4=1- (Y-Y2)/Y2, wherein A0 is a preset intensity standard value, the second preset condition is that the current main sludge reactor concentration and the current sewage treatment sludge concentration are less than the preset sewage treatment active sludge concentration and the current sewage treatment area is greater than the second preset sludge treatment area.
Specifically, under a second preset condition, namely that the concentration of active sludge in the current main sludge reactor is too low, but each sludge reactor can finish primary treatment of sewage, the sewage injection amount and the aeration intensity of the current main sludge reactor are adjusted by the intermediate purification chamber according to the sludge age in the main sludge reactor so as to adjust the environment of the current main sludge reactor, wherein if the sludge age in the current main sludge reactor of the intermediate purification chamber is less than or equal to the second preset sludge age, the sewage injection amount of the main sludge reactor is increased, meanwhile, a nutrient is injected into the current main sludge reactor so as to increase the sludge age, and the sludge age in the current main sludge reactor of the intermediate purification chamber is greater than the second preset sludge age, the aeration intensity of the current main sludge reactor is reduced so as to reduce the sludge age.
Please refer to fig. 3, which is a schematic structural diagram of a sludge reactor according to an embodiment of the present invention, and includes a sludge reactor, and an aeration mechanism disposed in the sludge reactor, where the aeration mechanism includes a sliding unit disposed in the sludge reactor and an aerator 106 connected to the sliding unit, the aerator is connected to a plurality of hoses for injecting oxygen into the sludge reactor in all directions, the top of the sludge reactor is provided with an electromagnetic valve 101 for controlling the amount of sewage injected into the current sludge reactor and a feed inlet 107 for injecting composite microorganisms into the current sludge reactor, the middle of the sludge reactor is provided with a water outlet 102 for discharging primarily treated sewage, the bottom of the sludge reactor is provided with a sludge discharge port 103 for discharging sludge, the sliding unit includes a first motor 105, the sewage treatment device comprises a sliding rod connected with a first motor and a lantern ring 104 arranged on the sliding rod, wherein the first motor controls the moving position of the lantern ring on the sliding rod, the lantern ring is connected with an aerator, in use, sewage flowing in from a water inlet pipe is injected into a sludge reactor under the control of an electromagnetic valve and is mixed with sludge in the sludge reactor, the aerator is used for aerating into the sludge reactor under the control of an air compressor (not shown in the figure) and is driven by a sliding unit to improve the aeration range and further improve the sewage treatment efficiency, the aeration time is 1-2h, the aeration intensity is 0.5-2 l/min, the sewage and the sludge are precipitated after aeration, the precipitation time is 15-25min, after the precipitation is finished, the sewage is discharged from a water outlet, and after the water discharge is finished, a sludge discharge port is opened to discharge quantitative sludge.
Specifically, the intermediate purification chamber adjusts the aeration intensity of each main sludge reactor based on the comparison of the sewage injection amount Vjp of each main sludge reactor with a preset injection amount standard value v0, wherein,
when Vjp < v0- Δ v, the intermediate clean room reduces the current aeration intensity Ae of the main sludge reactor to Ae1, setting Ae1= Ae x (1- (v 0- Δ v-Vjp)/v 0);
when v 0-delta v is not less than Vjp is not less than v0 plus delta v, the middle purifying chamber does not adjust the aeration intensity of the current main sludge reactor;
when Vjp > v0 +. DELTA.v, the middle cleaning room increases the current aeration intensity Ae of the main sludge reactor to Ae2, sets Ae2= Ae x (1 + (Vjp-v 0-DELTA.v)/v 0), and simultaneously increases the moving speed of the aerator by increasing the power parameter of the power mechanism in the sliding unit;
wherein, Δ v is a preset sewage treatment capacity error value of the intermediate purification chamber, and p =1,2,3, e =0,1.
Specifically, the aeration intensity in each main sludge reactor is adjusted according to the comparison of the sewage injection amount of each main sludge reactor with the preset injection amount, so that the aeration intensity in each main sludge reactor is matched with the sewage injection amount in the sludge reactor, and when the sewage injection amount exceeds the sum of the preset injection amount standard value and the error value, the aeration intensity of the main sludge reactor and the movement speed of the aerator are improved by the intermediate purification chamber, so that the oxygen content and the oxygen uniformity degree in the main sludge reactor are improved in a wider range, and the sewage treatment efficiency is guaranteed.
And if the total sewage treatment amount is greater than the amount of sewage to be treated, the starting number of the main sludge reactors is not adjusted, and if the total sewage treatment amount is less than the amount of sewage to be treated, the starting number of the main sewage reactors is increased.
Please refer to fig. 4, which is a schematic structural diagram of a sewage treatment chamber according to an embodiment of the present invention, including a biofilm reactor 23 capable of controlling a rotation speed by adjusting a power parameter of a second motor 22.
Specifically, in the step S2, the sewage treatment control platform compares the treatment efficiency D0 of the intermediate purification chamber with a preset treatment efficiency D, and the sewage treatment chamber selects a sewage treatment time, wherein,
when D0 is less than or equal to D1, the sewage treatment chamber selects a first preset treatment time T1 as sewage treatment time;
when D1 is more than D0 and less than D2, the sewage treatment chamber selects a second preset treatment time T2 as sewage treatment time;
when D0 is larger than or equal to D2, the sewage treatment chamber selects a third preset treatment time T3 as sewage treatment time;
the sewage treatment room is used for presetting treatment efficiency D, setting first preset treatment efficiency D1, second preset treatment efficiency D2, presetting treatment time T, setting first preset treatment time T1, second preset treatment time T2 and third preset treatment time T3.
Specifically, the sewage treatment control platform sets the treatment efficiency d0 of the intermediate purification chambers according to the average treatment efficiency value of the intermediate purification chambers, and sets d0= (d 1+ d2+ \8230 \ 8230; + dn)/n, wherein d1 is the treatment efficiency of the first intermediate purification chamber, d2 is the treatment efficiency of the second intermediate purification chamber \8230; \ 8230;, dn is the treatment efficiency of the nth intermediate purification chamber, n is a natural number which is more than or equal to 2 and represents the number of the intermediate purification chambers, and dx = (vx '-v 0)/v 0, wherein vx' is the actual sewage injection amount of the xth intermediate purification chamber, x 8282301, 2 \ 8230, and n.
The invention sets the ratio of the actual sewage injection amount of each intermediate purifying chamber, namely the difference value between the regulated sewage injection amount and the preset sewage injection amount standard value, to the sewage injection amount standard value as the treatment efficiency of each intermediate purifying chamber, sets the average value of the treatment efficiency of each total intermediate purifying chamber as the treatment efficiency of the intermediate purifying chamber, compares the treatment efficiency of the intermediate purifying chamber with the U preset treatment efficiency, and selects the optimal treatment time as the treatment time of the sewage treatment chamber to meet the treatment effect on the sewage, wherein the larger the acquired treatment efficiency value is, the longer the treatment time is selected to avoid the condition that the initial treatment of the sewage does not meet the standard due to the increase of the sludge activity concentration and the increase of the sewage injection amount, and the smaller the acquired treatment efficiency value is, the shorter the treatment time is selected to enable the sewage discharge after the sewage treatment to meet the standard.
Specifically, in the step S3, the sewage treatment control platform obtains a COD value S of the discharged sewage and compares the COD value S with a preset COD standard value S, and adjusts the preset treatment time of the sewage treatment chamber, wherein if S-S is greater than or equal to a second preset error value Δ S2, the sewage treatment control platform does not adjust the preset treatment time, and if S-S is greater than a first preset error value Δ S1 and is smaller than a second preset error value Δ S2, the sewage treatment control platform determines to prolong the preset treatment time of the sewage treatment chamber, and if S-S is less than or equal to the first preset error value Δ S1, the sewage treatment control platform determines to prolong the preset treatment time of the sewage treatment chamber, and simultaneously, increases the rotation rate of the biofilm reactor in the sewage treatment chamber.
Wherein, the difference value between the preset COD standard value S of the sewage treatment control platform and the COD value S of the sewage discharged by the sewage treatment control platform is larger than a first preset error value Delta S1 and is smaller than a second preset error value Delta S2, the sewage treatment control platform judges that the preset treatment time Tu of the sewage treatment chamber is prolonged to Tu1, tu1= Tux (1 + (. DELTA.s 2-S + S) × (S-S-. DELTA.s 1)/(. DELTA.s 1 ×. DELTA.s 2)), the difference value between the preset COD standard value S of the sewage treatment control platform and the COD value S of the sewage discharged by the sewage treatment control platform is smaller than or equal to a first preset error value Delta S1, the sewage treatment control platform judges that the preset treatment time Tu of the sewage treatment chamber is prolonged to Tu2, tu2= Tux (1 + (S-S-Delta S1)/[ Delta S1) is set, meanwhile, the rotation speed f of the biofilm reactor in the sewage treatment chamber is increased to f1, and f1= f x (1 + (S-S-Delta S1)/[ Delta S1) is set, wherein u =1,2,3.
Specifically, the COD detection is carried out on the discharged treated sewage, if the detection result does not meet the standard, the preset treatment time is prolonged according to the detection result so that the detection result of the discharged sewage meets the standard, and if the difference between the detection result and the preset standard value is too large, the rotation speed of the biofilm reactor is increased on the basis of prolonging the treatment time so as to accelerate the sewage treatment efficiency.
Please refer to fig. 5, which is a schematic structural diagram of a municipal sewage purification system based on biological treatment according to an embodiment of the present invention, including middle purification chambers in each area, the middle purification chambers in each area being provided with a sludge reaction unit, the sludge reaction unit including a plurality of sludge reactors for performing preliminary treatment on sewage; the sewage treatment chamber is connected with the middle purifying chambers of the regions and is used for intensively treating the sewage after the primary treatment of the middle purifying chambers of the regions; and the sewage treatment control platform is connected with each intermediate purification chamber and the sewage treatment chamber, and is used for determining the sewage treatment time of the sewage treatment chamber according to the sewage treatment efficiency of each intermediate purification chamber and regulating and controlling the preset treatment time according to the detection result of the discharged sewage so as to enable the discharged sewage to reach the standard.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (5)
1. A municipal sewage purification method based on biological treatment is characterized by comprising the following steps:
step S1, dividing municipal sewage into a plurality of areas according to the treatment capacity of the municipal sewage, wherein each area is provided with an intermediate purification chamber, the municipal sewage is filtered by a retention screen in the intermediate purification chamber and then injected into a sludge reaction unit for preliminary purification, the sludge reaction unit of each intermediate purification chamber comprises a plurality of main sludge reactors and a plurality of auxiliary sludge reactors, an aeration mechanism capable of controlling aeration intensity and aeration range is arranged in each sludge reactor, a sewage treatment control platform sets the number of the sludge reactors according to the treatment capacity M of the municipal daily sewage in the current area so as to enable each intermediate purification chamber to perform preliminary treatment on the municipal sewage in the current area, when M is less than or equal to M1, the sewage treatment control platform selects a first preset number N1 as the starting number of the sludge reactors in the intermediate purification chambers in the current area, when M1 is less than M and less than M2, selecting a second preset quantity N2 as the starting quantity of the sludge reactors in the middle purifying room in the current region by the sewage treatment control platform, when M is larger than or equal to M2, selecting a third preset quantity N3 as the starting quantity of the sludge reactors in the middle purifying room in the current region by the sewage treatment control platform, presetting daily sewage treatment quantity M by the sewage treatment control platform, setting a first preset daily sewage treatment quantity M1, a second preset daily sewage treatment quantity M2, a third preset daily sewage treatment quantity M3, a preset quantity N, setting a first preset quantity N1, a second preset quantity N2 and a third preset quantity N3, wherein 3/4Ni is the quantity of the main sludge reactors, 1/4Ni is the quantity of the auxiliary sludge reactors, i =1,2 and 3, arranging the activated sludge concentrations of the sludge reactors in the middle purifying room in sequence from large to small to determine the sewage injection quantity of the main sludge reactors, and determining the sewage injection quantity of the main sludge reactors by the middle purifying room according to the activated sludge concentration c of the main sludge reactors, when C is less than or equal to C1, the injection amount of V1 is set as the sewage injection amount injected into the current main sludge reactor by the intermediate purification chamber, when C1 is less than C and less than C2, the injection amount of V2 is set as the sewage injection amount injected into the current main sludge reactor by the intermediate purification chamber, when C is more than or equal to C2, the injection amount of V3 is set as the sewage injection amount injected into the current main sludge reactor by the intermediate purification chamber, the concentration C of activated sludge is preset in the intermediate purification chamber, a first preset activated sludge concentration C1, a second preset activated sludge concentration C2, a preset injection amount V, a first preset injection amount V1, a second preset injection amount V2 and a third preset injection amount V3 are set, and under a first preset condition, the sewage injection amount and the composite microorganism injection amount of the current main sludge reactor are adjusted by the intermediate purification chamber according to the age sludge Y in the main sludge reactor, the sludge age in the current main sludge reactor is less than or equal to a first preset sludge age Y1, the intermediate purification chamber adjusts the current sewage injection amount Vj of the main sludge reactor to Vj1, and sets Vj1= Vj x k1, wherein k1=1+ (Y1-Y)/Y1, and adjusts the compound microorganism injection amount w into the current main sludge reactor to w1, and sets w1= w x 1.25, the sludge age in the current main sludge reactor is greater than the first preset sludge age Y1, the intermediate purification chamber adjusts the current sewage injection amount Vj of the main sludge reactor to Vj2, and sets Vj2= Vj x 1.2, wherein k2=1 0.5 x (Y-Y1)/Y1, the first preset condition is that the active sludge concentration of the current main sludge reactor is greater than or equal to a second preset active sludge concentration, and the sum of the injected sewage amount of the main sludge reactor is less than or equal to the current regional daily urban sewage treatment amount, under a second preset condition, the intermediate purifying chamber adjusts the sewage injection amount and the aeration intensity of the current main sludge reactor according to the sludge age Y in the main sludge reactor, if the sludge age Y in the current main sludge reactor of the intermediate purifying chamber is less than or equal to a second preset sludge age Y2, the intermediate purifying chamber adjusts the sewage injection amount Vj of the current main sludge reactor to Vj3, sets Vj3= Vj × k3, sets k3=1 0.2 × (Y2-Y)/Y2, simultaneously injects a fixed amount of nutrients into the current main sludge reactor, if the sludge age Y in the current main sludge reactor of the intermediate purifying chamber is greater than the second preset sludge age Y2, the intermediate purifying chamber reduces the aeration intensity A0 to A1 of the current main sludge reactor, sets A1= A0 × k4, sets k4=1- (Y-Y2)/Y2, wherein A0 is a preset aeration intensity standard value, the second preset condition is that the active sludge concentration of the current main sludge reactor is less than the second preset active sludge concentration, the sum of the sewage injection amount of each main sludge reactor is greater than the urban daily sewage treatment amount of the current region, the intermediate purification chamber compares the sewage injection amount Vjp of each main sludge reactor with a preset injection amount standard value v0, and adjusts the aeration intensity of each main sludge reactor, wherein when Vjp is less than v 0-delta v, the intermediate purification chamber reduces the aeration intensity Ae of the current main sludge reactor to Ae1, and sets Ae1= Ae x (1- (v 0-delta v-Vjp)/v 0), when v 0-delta v is less than or equal to Vjp is less than or equal to v0 +. Delta v, and when v jp is greater than v0 +. Delta, the intermediate purification chamber increases the aeration intensity Ae of the current main sludge reactor to Ae2, setting Ae2= Ae x (1 + (Vjp-v 0-delta v)/v 0), and simultaneously increasing the moving speed of the aerator by increasing the power parameter of a power mechanism in the sliding unit, wherein the delta v is a preset sewage treatment capacity error value of the intermediate purification chamber, and p =1,2,3, e =0,1;
s2, the sewage treatment control platform acquires treatment time of a sewage treatment chamber for carrying out centralized treatment on the urban sewage according to the treatment efficiency of each intermediate purification chamber, if the treatment efficiency of each intermediate purification chamber does not meet a preset standard, the sewage treatment control platform prolongs the treatment time in the sewage treatment chamber so as to enable sewage discharge to meet the standard, and the sewage treatment chamber is provided with a rotary biofilm reactor;
and S3, detecting the urban sewage discharged in the step S2 by the sewage treatment control platform, and adjusting the preset treatment time and the rotation rate of the biofilm reactor according to the detection result so as to enable the discharged sewage to meet the discharge requirement.
2. The municipal sewage purification method according to claim 1, wherein the sewage treatment control means compares the intermediate purification chamber treatment efficiency D0 with a predetermined treatment efficiency D in step S2, and the sewage treatment chamber selects a sewage treatment time, wherein,
when D0 is less than or equal to D1, the sewage treatment chamber selects a first preset treatment time T1 as sewage treatment time;
when D1 is more than D0 and less than D2, the sewage treatment chamber selects a second preset treatment time T2 as sewage treatment time;
when D0 is more than or equal to D2, selecting a third preset treatment time T3 as the sewage treatment time in the sewage treatment chamber;
the sewage treatment room is used for presetting treatment efficiency D, setting first preset treatment efficiency D1, second preset treatment efficiency D2, presetting treatment time T, setting first preset treatment time T1, second preset treatment time T2 and third preset treatment time T3.
3. The municipal wastewater purification method according to claim 2, wherein the wastewater treatment control platform sets the treatment efficiency of the intermediate purification rooms as d0 and sets the treatment efficiency of the intermediate purification rooms as d0, wherein d0= (d 1+ d2+ \8230 \\ 8230; \ + dn)/n, wherein d1 is the treatment efficiency of the first intermediate purification room, d2 is the treatment efficiency of the second intermediate purification room as 8230 \ 8230; \ dn is the treatment efficiency of the nth intermediate purification room, and n is a natural number of 2 or more, which indicates the number of intermediate purification rooms, and dx = (vx '-v 0)/v 0, wherein vx' is the actual wastewater injection amount of the xth intermediate purification room, x =1, 2:8230; \\\\ 8230n.
4. The method of claim 2, wherein in the step S3, the sewage treatment control platform obtains the COD value S of the discharged sewage and compares the COD value S with a predetermined COD standard value S to adjust the predetermined treatment time of the sewage treatment chamber, wherein if S-S is greater than or equal to a second predetermined error value Δ S2, the sewage treatment control platform does not adjust the predetermined treatment time, and if S-S is greater than a first predetermined error value Δ S1 and is less than the second predetermined error value Δ S2, the sewage treatment control platform determines to extend the predetermined treatment time of the sewage treatment chamber, and if S-S is less than or equal to the first predetermined error value Δ S1, the sewage treatment control platform determines to extend the predetermined treatment time of the sewage treatment chamber and to increase the rotation rate of the biofilm reactor in the sewage treatment chamber.
5. The municipal sewage purification method according to claim 4, wherein the difference between the COD standard value S preset by the sewage treatment control platform and the COD value S of the sewage obtained and discharged by the sewage treatment control platform is greater than a first preset error value Δ S1 and smaller than a second preset error value Δ S2, the sewage treatment control platform determines to extend the treatment time Tu preset by the sewage treatment chamber to Tu1, tu1= Tu x (1 + (Δs2-S + S) x (S-S- Δ S1)/(Δs1 x Δ S2)), the difference value between the preset COD standard value S of the sewage treatment control platform and the COD value S of the sewage discharged by the sewage treatment control platform is smaller than or equal to a first preset error value Delta S1, the sewage treatment control platform judges that the preset treatment time Tu of the sewage treatment chamber is prolonged to Tu2, tu2= Tux (1 + (S-S-Delta S1)/[ Delta S1) is set, meanwhile, the rotation speed f of the biofilm reactor in the sewage treatment chamber is increased to f1, and f1= f x (1 + (S-S-Delta S1)/[ Delta S1) is set, wherein u =1,2,3.
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