CN114105361B - Coagulation oxidation co-processing method for quickly reducing overflow pollution - Google Patents
Coagulation oxidation co-processing method for quickly reducing overflow pollution Download PDFInfo
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
Abstract
The invention provides a coagulation and oxidation cooperative treatment method for quickly reducing overflow pollution, which comprises the following steps: coagulation pretreatment, in-situ oxidation, flocculation, precipitation and discharge. Compared with the prior art, the invention provides the scheme of in-situ coagulation of the pipeline, so that the water conservancy residence time is shortened; the biochar catalytic oxidation is developed, and the limitation of acidic pH required by a Fenton oxidation method is overcome; the common removal of various polymorphic pollutants is realized by a coagulation coupling oxidation method; the process is controlled to be completed within 15min, and the SS and COD removal efficiency is high; the sludge containing a large amount of ferric salt generated in the process can be recovered and converted into catalytic oxidation materials through high-temperature anaerobic pyrolysis, so that the treatment of wastes with processes of wastes against one another and the cyclic utilization of internal carbon sources are realized.
Description
Technical Field
The invention relates to the technical field of environmental chemistry, in particular to a coagulation and oxidation cooperative treatment method for quickly reducing overflow pollution.
Background
The black and odorous water body is a water pollution problem caused by excessive sewage containing of the water body and exceeding of the water environment capacity of the water body, and main pollutants of the black and odorous water body comprise black-causing particles and odorous organic matters. Since the implementation of the action plan for preventing and controlling water pollution, the problem of black and odorous water bodies in the whole year is well improved, but the problem of black and odorous water bodies in rainy days is still serious.
Overflow contamination is one of the key causes of dark and smelly rain. Aiming at main black and odor causing substances in overflow pollution, the coagulation-oxidation technology is an effective means for cooperatively controlling pollution. However, the existing coagulation and oxidation synergistic mode has the problems of large floor area, long retention time, biotoxicity of medicament residues, acidification neutralization in the synergistic process and the like, and is difficult to apply to the treatment of overflow pollution in rainy days in situ.
In the prior art, CN 112340826A (a pipeline coagulation method for rapidly reducing pollution discharged to the river) provides a method for reducing overflow pollution by utilizing coagulation and flocculation, mainly aiming at granular pollutants in water, and being incapable of acting on soluble organic matters in water, and the used medicament has biological toxicity.
In the prior art, CN106365348A (Fenton cooperating with ozone fluidization catalytic oxidation wastewater treatment device and method for treating wastewater thereof) provides a method for cooperatively treating organic matters and particulate matters in wastewater, so as to improve the removal effect of COD and chromaticity in wastewater. However, the method needs a process of acidification first and neutralization second, has a retention time of more than 6 hours, and is not suitable for quickly reducing overflow pollution.
Disclosure of Invention
The invention aims to provide a coagulation-oxidation synergistic method under a neutral condition, develop a heterogeneous catalytic oxidation medicament, shorten the retention time, effectively utilize the pipeline space and efficiently remove SS and COD in overflow sewage (CSO).
In order to achieve the purpose, the invention adopts the following technical scheme:
a coagulation oxidation cooperative treatment method for quickly reducing overflow pollution comprises the following steps:
s1-coagulation: the tail end of the drainage pipeline is communicated with the purification tank, the turbulent flow condition required by coagulation is provided by utilizing the self hydrodynamic force in the pipeline of the drainage pipeline in rainy days, and the coagulant is added through the inspection well to realize the in-situ coagulation of the tail end of the drainage pipeline;
s2-oxidation: the water coagulated in the step S1 enters a first procedure of a purification tank, an oxidant and biochar are added in the first procedure of the purification tank through a dosing device, and then the mixture is stirred according to the speed of 200r/m and reacts for 5-10min; the concentration of the oxidant in the purification tank is 1mg/L, and the concentration of the biochar is 100mg/L; the pH value after reaction is neutral, and acidification and neutralization are not needed;
s3-flocculation: the water oxidized in the step S2 enters a second procedure of the purification tank, a flocculating agent is added into the second procedure of the purification tank through a dosing device, and after the flocculating agent is added, stirring is carried out according to 50r/m, and the reaction lasts for 2min;
s4-precipitation: and (4) the flocculated water in the step (S3) enters a third procedure of a purification tank for solid-liquid separation, wherein the solid-liquid separation time is 2-5min, and a supernatant area at the upper layer and a sludge concentration area at the bottom are formed.
S5-discharging: and (5) discharging the clear water in the supernatant area into the nature in the step (S4).
Preferably, the distance between the inspection well for adding the coagulant and the purification tank in the step S1 meets the distance required by 1min of reaction time under real-time flow.
Preferably, a dosing device and a flowmeter are arranged at the inspection well.
Preferably, the coagulant in step S1 comprises FeCl 3 ·6H 2 O, ferric salt coagulant such as polyferric chloride and the like.
Preferably, the biochar in the step S2 is biochar loaded with nano zero-valent iron, and is prepared by carrying out anaerobic high-temperature pyrolysis on agricultural and forestry waste or coagulated iron-containing sludge as a raw material.
Preferably, the sludge at the bottom in the step S4 can be used as the raw material of the biochar, the recycled sludge can be used as a carbon source rich in Fe, the biochar is obtained again through high-temperature oxygen-free calcination and is reused in the step S2, and energy conservation and environmental protection are realized.
Preferably, the preparation condition of the biochar is anaerobic calcination at 800 ℃ for 2h, and the heating rate is 10 ℃/min.
Preferably, the particle size of the biochar particles is less than or equal to 150 μm.
Preferably, the oxidant in step S2 includes hydrogen peroxide (H) 2 O 2 ) One or more of common peroxides such as Peroxymonosulfate (PMS) and Peroxydisulfate (PS).
Preferably, the flocculant in step S3 comprises biodegradable macromolecular flocculant such as chitosan and cellulose, and the addition amount of the flocculant is 0.8% -1.2% of the coagulant.
Compared with the prior art, the invention has the following beneficial effects:
1. the application provides a method for pipeline in-situ coagulation to treat overflow pollution, and the method utilizes the pipeline space, shortens the reaction residence time and saves the occupied area.
2. The application provides the application of the coagulation and oxidation cooperative process in treating overflow pollution, and in the coagulation and flocculation processes, the advanced oxidation technology is coupled to realize the common removal of the black and odor causing substances.
3. The application provides a method for developing a biochar heterogeneous catalyst, an electron path is provided through biochar surface functional groups and defect point positions, activation of peroxymonosulfate under a neutral condition is achieved, sulfate radicals and hydroxyl radicals are generated in situ, and other active oxidation components are generated, so that efficient degradation of organic matters under the neutral condition is achieved. Compared with the prior art, the method simplifies the acidification and neutralization processes in the coagulation oxidation synergistic process, shortens the reaction time, and simultaneously improves the degradation efficiency of organic matters.
4. The application provides the recycling of the sludge after the reaction, the excess sludge is used as the source of the biochar raw material, the biochar loaded with the nano zero-valent iron is regenerated through anaerobic high-temperature pyrolysis, the internal carbon source circulation and the biochar material are recycled, and no medicament residue and no toxicity are generated.
Compared with the prior art, the invention provides the scheme of in-situ coagulation of the pipeline, so that the water conservancy residence time is shortened; the biochar catalytic oxidation is developed, and the limitation of acidic pH required by a Fenton oxidation method is overcome; the common removal of various polymorphic pollutants is realized by a coagulation coupling oxidation method; the process is controlled to be completed within 15min, and the removal efficiency of SS and COD is high; sludge containing a large amount of ferric salt generated in the process can be recycled and converted into catalytic oxidation materials through high-temperature anaerobic pyrolysis, so that waste control by waste and cyclic utilization of internal carbon sources are realized.
Drawings
FIG. 1 is a schematic process flow diagram of a coagulation-oxidation co-treatment method for rapid reduction of overflow contamination according to the present invention;
FIG. 2 is a histogram of the COD and TOC removal rates obtained under the conditions of illumination and examples 1-7 according to the present invention.
Fig. 3 is a Scanning Electron Microscope (SEM) of a biocoke catalyst used in a coagulation oxidation co-processing method for rapid reduction of overflow contamination according to the present invention.
FIG. 4 is an energy spectrum analysis (SEM-EDX) of the biochar catalyst used in the method, and it is confirmed that the prepared biochar material is rich in 20% of Fe element.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1 to 4, the method for coagulation-oxidation co-processing for quickly reducing overflow pollution disclosed by the present invention comprises the following steps:
s1-coagulation: the method utilizes the hydrodynamic force of the pipeline in rainy days to provide turbulent conditions required by coagulation, and a coagulant is added through the inspection well to realize the in-situ coagulation of the tail end of the drainage pipeline.
Furthermore, the tail end of the drainage pipeline is communicated with the purification tank.
Further, the distance between the inspection well for adding the coagulant and the purification tank meets the distance required by 1min reaction time under real-time flow.
Furthermore, a chemical adding device and a flowmeter are arranged at the inspection well.
Further, the coagulant comprises FeCl 3 ·6H 2 O, ferric salt coagulant such as polyferric chloride and the like.
S2-oxidation: and (2) the water coagulated in the step (S1) enters a first process of a purification tank, an oxidant and biochar are added through a dosing device, the concentration of the added oxidant is 1mg/L, the concentration of the added biochar is 100mg/L, the stirring speed is 200r/m, and the water is stirred and reacts for 5-10min.
Furthermore, the biochar is loaded with nano zero-valent iron, and is prepared by carrying out anaerobic high-temperature pyrolysis on agricultural and forestry waste or coagulated iron-containing sludge as a raw material.
Further, the preparation conditions of the biochar are that the biochar is subjected to anaerobic calcination at 800 ℃ for 2 hours, and the heating rate is 10 ℃/min. The particle size of the biochar particles is less than or equal to 150 mu m.
Further, the oxidant comprises hydrogen peroxide (H) 2 O 2 ) One or more of common peroxides such as Peroxymonosulfate (PMS) and Peroxydisulfate (PS).
Further, the reaction pH is neutral, and acidification is not needed before neutralization.
S3-flocculation: and (3) the water oxidized in the step (S2) enters a second procedure of a purification tank, a flocculating agent is added through a dosing device, the stirring speed is 50r/min, and the water is stirred and reacts for 2min.
Further, the flocculant comprises biodegradable macromolecular flocculant such as chitosan and cellulose. The addition amount of the flocculant is 0.8 to 1.2 percent of that of the coagulant.
S4-precipitation: and (4) the flocculated water in the step (S3) enters a third process of a purification tank, solid-liquid separation time is 2-5min, and an upper layer supernatant area and a bottom sludge concentration area are formed.
S5, discharging and treating: clear water in the supernatant region is discharged into the nature, sludge at the bottom can be recycled as a raw material of the biochar in the step S2, the recycled sludge can be used as a carbon source rich in Fe, and the biochar is obtained again through high-temperature oxygen-free calcination and is reused in the step S2. According to the method provided above, the present invention is described in detail with reference to the data provided in the following examples:
example 1
A coagulation oxidation cooperative treatment method for quickly reducing overflow pollution comprises the following specific steps:
(I) reaction Process
Mixing the pipeline sludge and rainwater according to a proper proportion, and then carrying out centrifugal treatment, (the centrifugal data adopts 6000rpm,10min and 20 ℃), taking supernatant, and mixing the supernatant with a proper amount of kaolin to obtain overflow sewage stock solution with the initial COD of 115mg/L, turbidity of 288NTU, pH of 7.18 and Total Nitrogen (TN) of 21.78 mg/L.
S1-coagulation: 200mL of overflow sewage stock solutionAdding coagulant FeCl as reaction stock solution 3 ·6H 2 O, the concentration is 50mg/L, and the reaction is carried out for 1min under the stirring condition of 200 rpm;
s2-oxidation: adding oxidant H into coagulated water sample 2 O 2 The adding concentration is 1mg/L, and the reaction is carried out for 10min under the stirring condition of 200 rpm;
s3-flocculation: adding flocculant chitosan (MW =500,000) into the oxidized water sample, wherein the concentration of the flocculant is 25mg/L, and reacting for 2min under the stirring condition of 50 rpm;
s4-precipitation: stopping stirring after the reaction is finished, and standing and precipitating for 2min;
s5-discharging the clear water in the supernatant region into the nature.
(all reagents were used after being prepared as concentrated solutions.)
(II) control group:
in the reaction process, the reagent is added and the dosage of the control group is blank in the oxidation stage, and the reaction conditions are not changed in other stages.
In this example, the removal rate of COD was increased by 30.91% and TOC was not significantly changed as compared with the control group.
Example 2
The procedure differs from example 1 by: adding an oxidant Na into a coagulated water sample 2 S 2 O 8 (PS) and the adding concentration is 1mg/L, and the reaction is carried out for 10min under the stirring condition of 200 rpm. Compared with the control group, the COD removal rate is reduced by 22.72 percent, and the TOC has no obvious change.
Example 3
The procedure differs from example 1 in that: adding oxidant NaHSO into coagulated water sample 5 - (PMS), the adding concentration is 1mg/L, and the reaction is carried out for 10min under the stirring condition of 200 rpm. Compared with the control group, the COD removal rate is improved by 47.27 percent, and the TOC removal rate is improved by 28.19 percent.
Example 4
The procedure differs from example 1 in that: and (3) adding no oxidant into the coagulated water sample, only adding biochar with the addition amount of 200mg/L, and reacting for 10min under the stirring condition of 200 rpm.
The preparation method of the biochar catalyst comprises the following steps:
s1: 5g of biomass powder (A)<0.15 mm) with 50mL FeCl 3 Mixing the solution (289 g/L, the mass ratio of Fe to biomass is 1;
s2: filtering and vacuum drying (drying at 80 ℃ for 24 h);
s3: the mixture is oxygen-free (N) at 800 DEG C 2 ) Calcining for 2h at a heating rate of 10 deg.C for min -1 ；
S4: after the sample is cooled to room temperature, grinding the black powder, washing the black powder for three times by using ultrapure water, and drying the black powder at 80 ℃;
s5: the samples were stored dry in vacuo.
Compared with the control group, the COD removal rate is improved by 9.99 percent, and the TOC removal rate is improved by 20.64 percent.
Example 5
The procedure differs from example 4 in that: adding biochar into a coagulated water sample, wherein the adding amount is 200mg/L, and simultaneously adding H 2 O 2 The adding concentration is 1mg/L, and the reaction is carried out for 10min under the stirring condition of 200 rpm. Compared with the control group, the COD removal rate is improved by 57.30 percent, and the TOC removal rate is improved by 85.34 percent. Compared with example 4, the COD removal rate is improved by 43.01 percent, and the TOC removal rate is improved by 53.63 percent.
Example 6
The procedure differs from example 4 by: adding biochar into a coagulated water sample, wherein the adding amount is 200mg/L, and adding Na 2 S 2 O 8 The adding concentration is 1mg/L, and the reaction is carried out for 10min under the stirring condition of 200 rpm. Compared with the control group, the COD removal rate is improved by 32.71 percent, and the TOC removal rate is improved by 62.40 percent. Compared with example 4, the COD removal rate is improved by 20.65%, and the TOC removal rate is improved by 34.61%.
Example 7
The procedure differs from example 4 in that: adding biochar in 200mg/L and NaHSO into the coagulated water sample 5 - The adding concentration is 1mg/L, and the reaction is carried out for 10min under the stirring condition of 200 rpm. Compared with the control group, the COD removal rate is improved by 88.17 percent, and the TOC removal rate is improved by 143.51 percent. Compared with example 4, the COD removal rate is improved by 71.07 percent, and the TOC removal rate is improved by 101 percent.84％。
Table 1 shows the experimental data of COD and TOC removal rate after 15min of reaction in different examples of the control groups of examples 1 to 7.
TABLE 1
Compared with the prior art, the invention has the following beneficial effects:
1. the application provides a method for pipeline in-situ coagulation to treat overflow pollution, and the method utilizes the pipeline space, shortens the reaction residence time and saves the occupied area.
2. The application provides the application of the coagulation oxidation synergistic process in treating overflow pollution, and in the coagulation and flocculation processes, the advanced oxidation technology is coupled to realize the co-removal of the blackening and odor causing substances.
3. The application provides and develops biological charcoal heterogeneous catalyst, through biological charcoal surface functional group, the defect point position provides electron path, realizes the activation to peroxymonosulfate under the neutral condition, and normal position produces sulfate radical free radical and hydroxyl free radical, and other active oxidation composition to reach the high-efficient degradation of organic matter under the neutral condition. Compared with the prior art, the method simplifies the acidification and neutralization processes in the coagulation oxidation synergistic process, shortens the reaction time, and simultaneously improves the degradation efficiency of organic matters.
4. The application provides the recycling of the sludge after the reaction, the excess sludge is used as the source of the biochar raw material, the biochar loaded with the nano zero-valent iron is regenerated through anaerobic high-temperature pyrolysis, the internal carbon source circulation and the biochar material are recycled, and no medicament residue and no toxicity are generated.
In conclusion, the method comprises the processes of coagulation pretreatment, neutral pH in-situ oxidation, flocculation and precipitation. Coagulation pretreatment: providing turbulent flow mixing conditions for overflow sewage generated in rainy days in a pipeline through hydrodynamic force generated by rainfall, and adding a coagulant through an inspection well to realize colloid destabilization; in-situ oxidation: pumping the sewage coagulated in the pipeline into a purification tank, and adding a catalyst and an oxidant into the purification tank to realize the oxidative degradation of soluble pollutants; flocculation: under the condition of low-speed stirring, adding a biodegradable flocculating agent to realize small particle agglomeration to form flocs; and (3) precipitation: and precipitating in a purification tank to realize solid-liquid separation. Compared with the prior art, the invention provides the scheme of in-situ coagulation of the pipeline, so that the water conservancy residence time is shortened; the biochar catalytic oxidation is developed, and the limitation of acidic pH required by a Fenton oxidation method is overcome; the method realizes the common removal of various polymorphic pollutants by a coagulation coupling oxidation method; the process is controlled to be completed within 15min, and the SS and COD removal efficiency is high; the sludge containing a large amount of ferric salt generated in the process can be recovered and converted into catalytic oxidation materials through high-temperature anaerobic pyrolysis, so that the treatment of wastes with processes of wastes against one another and the cyclic utilization of internal carbon sources are realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A coagulation oxidation cooperative treatment method for quickly reducing overflow pollution is characterized by comprising the following steps:
s1-coagulation: the tail end of the drainage pipeline is communicated with the purification tank, the turbulent flow condition required by coagulation is provided by utilizing the hydrodynamic force of the drainage pipeline in rainy days, and the in-situ coagulation of the tail end of the drainage pipeline is realized by adding a coagulant through the inspection well, wherein the coagulant is an iron salt coagulant;
s2-oxidation: the water coagulated in the step S1 enters a first procedure of a purification tank, an oxidant and biochar are added in the first procedure of the purification tank through a dosing device, and then the water is stirred at the speed of 200r/min and reacts for 5-10min; the concentration of the oxidant in the purification tank is 1mg/L, and the concentration of the biochar is 100mg/L; the pH value after reaction is neutral, and acidification and neutralization are not needed; the oxidant is selected from one or more of hydrogen peroxide, peroxymonosulfate or peroxydisulfate;
s3-flocculation: the water oxidized in the step S2 enters a second procedure of the purification tank, a flocculating agent is added into the second procedure of the purification tank through a dosing device, and after the flocculating agent is added, stirring is carried out according to the speed of 50r/min, and the reaction lasts for 2min;
s4-precipitation: the flocculated water in the step S3 enters a third procedure of a purification tank for solid-liquid separation, wherein the solid-liquid separation time is 2-5min, and an upper clear zone and a bottom sludge concentration zone are formed;
s5-discharging: the clear water in the supernatant area in the step S4 is discharged into the nature;
the biochar in the step S2 is biochar loaded with nano zero-valent iron, and the biochar is prepared by carrying out anaerobic high-temperature pyrolysis on coagulated iron-containing sludge as a raw material;
the sludge at the bottom in the step S4 is adopted as the raw material of the biochar, the recycled sludge is used as a carbon source rich in Fe, the biochar is obtained again through high-temperature oxygen-free calcination and is reused in the step S2, and energy conservation and environmental protection are achieved.
2. The coagulation and oxidation cooperative treatment method for the rapid reduction of overflow pollution according to claim 1, wherein the distance between the inspection well for adding the coagulant and the purification tank in the step S1 satisfies the distance required by the reaction time of 1min at a real-time flow rate.
3. The coagulation oxidation co-processing method for rapidly reducing overflow pollution according to claim 1, wherein a chemical adding device and a flow meter are arranged at the inspection well.
4. The coagulation-oxidation cooperative treatment method for the rapid reduction of overflow contamination according to claim 1, wherein the coagulant used in step S1 comprises FeCl 3 ·6H 2 O and/or poly ferric chloride.
5. The coagulation oxidation co-processing method for rapidly reducing overflow pollution according to claim 1, wherein the biochar in the step S2 is biochar loaded with nano zero-valent iron, and is prepared by carrying out anaerobic high-temperature pyrolysis on agricultural and forestry waste serving as a raw material.
6. The coagulation oxidation co-processing method for rapid reduction of overflow pollution as claimed in claim 1, wherein the preparation condition of the biochar is anaerobic calcination at 800 ℃ for 2h, and the temperature rise rate is 10 ℃/min.
7. The coagulation oxidation co-processing method for rapidly reducing overflow pollution according to claim 1, wherein the particle size of the biochar particles is less than or equal to 150 μm.
8. The coagulation oxidation co-processing method for rapidly reducing overflow pollution according to claim 1, wherein the oxidant in the step S2 comprises one or more of hydrogen peroxide, sodium peroxymonosulfate or sodium peroxydisulfate.
9. The coagulation and oxidation cooperative treatment method for the rapid reduction of overflow contamination according to claim 1, wherein the flocculant in step S3 comprises chitosan and/or cellulose, and the addition amount of the flocculant is 0.8% -1.2% of the coagulant.
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