CN114409175A - System and method for treating wastewater generated in anthraquinone process hydrogen peroxide production by electrolytic flocculation method - Google Patents
System and method for treating wastewater generated in anthraquinone process hydrogen peroxide production by electrolytic flocculation method Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F2101/00—Nature of the contaminant
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- C02F2101/105—Phosphorus compounds
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- 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
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- 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
- C02F3/30—Aerobic and anaerobic processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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 treatment method of waste water in hydrogen peroxide production, in particular to a treatment system and a treatment method of waste water in anthraquinone process hydrogen peroxide production by an electrolytic flocculation method, which are used for solving the defects of increased solid waste treatment cost, low automation degree and complex operation caused by the generation of a large amount of iron mud in the treatment of waste water in anthraquinone process hydrogen peroxide production by a Fenton oxidation method. This electrolytic flocculation method is handled anthraquinone method hydrogen peroxide production effluent disposal system, including the mud storage box to and the oil removal buffer memory pond, waste water equalizing basin, electrolytic flocculation equipment, coagulating sedimentation equipment, middle pond, air supporting machine, clean water basin, AO reaction tank and the membrane bioreactor that set gradually. Meanwhile, the invention also provides a method for treating wastewater produced by anthraquinone process hydrogen peroxide production by using an electrolytic flocculation method.
Description
Technical Field
The invention relates to a method for treating wastewater generated in hydrogen peroxide production, in particular to a system and a method for treating wastewater generated in hydrogen peroxide production by an anthraquinone process through an electrolytic flocculation method.
Background
Hydrogen peroxide as a green and pollution-free strong oxidant has been widely used in various industries such as paper making, textile, medical treatment, chemical industry, electronics, food and the like. The anthraquinone process is a main method for producing hydrogen peroxide at present, but a large amount of process wastewater is generated in the production process, and the process wastewater contains high-concentration organic pollutants which are difficult to degrade and exists in the forms of oil slick (>100 micrometers), suspended oil globules (10-100 micrometers), emulsified oil (<10 micrometers) and the like.
The Fenton oxidation method is a core method for treating wastewater produced by hydrogen peroxide through an anthraquinone process in recent years, and adopts a homogeneous catalytic oxidation method with hydrogen peroxide as an oxidant and ferrous salt as a catalyst, hydroxyl radicals generated in the reaction are radicals with strong oxidizing capability and can oxidize organic matters in the wastewater so as to effectively remove COD (chemical oxygen demand) in the wastewater, but although the Fenton oxidation method can effectively treat the wastewater produced by the hydrogen peroxide through the anthraquinone process, a large amount of iron mud is generated through Fenton oxidation, so that the solid waste treatment cost of enterprises is greatly increased, and the process has low automation degree and is complicated to operate.
Disclosure of Invention
The invention aims to solve the defects that the solid waste treatment cost is increased, the automation degree is low and the operation is complicated due to the fact that a large amount of iron mud is generated when the waste water produced by the anthraquinone method hydrogen peroxide is treated by the Fenton oxidation method, and provides a treatment system and a treatment method for treating the waste water produced by the anthraquinone method hydrogen peroxide by the electrolytic flocculation method.
In order to solve the defects of the prior art, the invention provides the following technical solutions:
the electrolytic flocculation method is used for treating wastewater produced by anthraquinone process hydrogen peroxide production, and is characterized in that: the device comprises a sludge storage tank, and an oil separation cache tank, a wastewater adjusting tank, an electrolytic flocculation device, a coagulating sedimentation device, an intermediate water tank, an air floatation machine, a clean water tank, an A/O reaction tank and a membrane bioreactor which are sequentially arranged;
the oil removal cache pool is used for carrying out oil removal treatment on process wastewater to form oil removal wastewater, and the process wastewater is anthraquinone process hydrogen peroxide production wastewater containing high-concentration nondegradable organic pollutants; the waste water adjusting tank is used for receiving deoiling waste water and other waste water of a plant area; the electrolytic flocculation equipment is used for treating the effluent of the wastewater adjusting tank to produce a first precipitate concentrated solution and first sewage; the coagulating sedimentation equipment is used for treating the first sewage to produce a second sedimentation concentrated solution and second sewage; the middle water tank is used for receiving and storing second sewage; the air floatation machine is used for treating the second sewage to produce a third precipitation concentrated solution and third sewage; the clean water tank is used for receiving and storing third sewage; the A/O reaction tank is used for treating third sewage to produce first chemical sludge and fourth sewage; the membrane bioreactor is used for treating fourth sewage to produce second biochemical sludge and sewage which reaches the standard and is discharged;
the input end of the sludge storage tank is connected with the electrolytic flocculation device, the coagulating sedimentation device, the air flotation machine, the A/O reaction tank and the membrane bioreactor and is used for storing a first sedimentation concentrated solution, a second sedimentation concentrated solution, a third sedimentation concentrated solution, first biochemical sludge and second biochemical sludge;
the sludge storage tank is periodically transported outside and treated in a centralized way.
Further, the other wastewater is wastewater which does not contain floating oil and has COD less than 3000 mg/L.
Furthermore, the oil separation buffer tank, the wastewater adjusting tank, the electrolytic flocculation equipment, the coagulating sedimentation equipment, the intermediate water tank, the air floatation machine, the clean water tank, the A/O reaction tank and the membrane bioreactor are all provided with a waste gas collecting cover, so that waste gas generated in the technical process is effectively collected and treated.
The electrolytic flocculation method for treating the wastewater generated in the production of the hydrogen peroxide by the anthraquinone method is characterized by comprising the following steps based on the treatment system:
step (1): the process wastewater is subjected to deoiling treatment in an oil separation buffer tank to produce deoiling wastewater; the deoiling wastewater enters a wastewater adjusting tank to be mixed with other wastewater; the process wastewater is the wastewater produced by hydrogen peroxide by an anthraquinone process;
step (2): after the effluent of the wastewater adjusting tank enters electrolytic flocculation equipment, adjusting the pH value of the wastewater in the electrolytic flocculation equipment to 5-6 by adding a pH agent, reaching the environment required by electrolytic flocculation, and starting electrolytic flocculation operation; reacting in the electrolytic flocculation equipment to produce a first precipitation concentrated solution and first sewage, wherein the first precipitation concentrated solution enters a sludge storage tank, and the first sewage enters coagulation sedimentation equipment;
and (3): after the PH value of the first sewage in the coagulating sedimentation equipment is adjusted to be 8-9 by adding PH drugs, PAC and PAM are added, the first sewage produces a second sedimentation concentrated solution and second sewage, the second sedimentation concentrated solution enters a sludge storage tank, and the second sewage enters an air flotation machine through an intermediate water tank;
and (4): adding PAC and PAM into second sewage in the air flotation machine, introducing micro bubbles, producing third precipitated concentrated solution and third sewage from the second sewage, and enabling the third precipitated concentrated solution to enter a sludge storage tank;
and (5): the third sewage enters the A/O reaction tank through the clean water tank, the third sewage is treated by the A/O reaction tank to produce first biological sludge and fourth sewage, the first biological sludge enters the sludge storage tank, and the fourth sewage enters the membrane bioreactor;
and (6): treating the fourth sewage by a membrane bioreactor to produce standard-reaching discharge sewage and second biochemical sludge, and allowing the second biochemical sludge to enter a sludge storage tank;
and (7): the sludge storage tank is periodically transported outside for treatment.
Further, in the step (1), the deoiling treatment has the effects of removing floating oil by more than 95%, removing suspended oil by less than 60% and removing emulsified oil by less than 10%.
Further, in the step (2), the electrolytic flocculation equipment (3) has the effects of oil removal rate > 97%, COD removal rate > 85%, phosphorus removal rate > 80%, nitrogen removal rate > 40% and ammonia nitrogen removal rate > 40% on mixed wastewater treatment.
Further, in the step (3), the effect of the coagulating sedimentation device (4) on the first sewage treatment is that the COD removal rate is more than 30%.
Further, in the step (4), the third sewage meets the following standard: COD is less than 1000mg/L, suspended solids are less than 20 mg/L; the sewage discharged after reaching the standard meets the primary standard of the comprehensive sewage discharge standard GB 8978-.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention discloses a treatment system for treating waste water produced in anthraquinone process hydrogen peroxide production by an electrolytic flocculation method, which comprises an oil separation cache tank, an electrolytic flocculation device, a coagulating sedimentation device, an air floatation machine, an A/O reaction tank and a membrane bioreactor which are sequentially arranged, wherein the system only needs oil separation before electrolytic flocculation to remove larger-sized pollutants in sewage without pretreatment such as coagulating air floatation and the like, the treatment effect is excellent, the retention time is short, the application range to the sewage quality is wide, and the produced water quality is stable; compared with a Fenton oxidation method, the system has low sludge yield, and the sludge storage tank can be periodically transported out for treatment.
(2) The invention discloses a method for treating wastewater produced by anthraquinone process hydrogen peroxide by using an electrolytic flocculation method, which adopts the electrolytic flocculation method to replace the traditional Fenton oxidation method as the core of the treatment process of the wastewater produced by anthraquinone process hydrogen peroxide.
(3) The invention adopts the electrolytic flocculation method, so that the sewage treatment process has the effects of oxidation/reduction degradation, sterilization, flocculation, air flotation and the like, and can effectively degrade organic pollutants.
(4) The invention has the advantages of compact process, small occupied area of equipment, low investment cost, good treatment effect and convenient automatic control.
Drawings
FIG. 1 is a schematic structural diagram of a system for treating wastewater from anthraquinone process hydrogen peroxide production by electrolytic flocculation.
The reference numerals are explained below: 1-oil separation buffer tank, 2-wastewater adjusting tank, 3-electrolytic flocculation equipment, 4-coagulating sedimentation equipment, 5-intermediate water tank, 6-air floatation machine, 7-clear water tank, 8-A/O reaction tank, 9-membrane bioreactor and 10-sludge storage tank.
Detailed Description
The invention will be further described with reference to the drawings and exemplary embodiments.
Referring to fig. 1, the system for treating waste water produced in production of hydrogen peroxide by anthraquinone process through electrolytic flocculation comprises a sludge storage tank 10, and an oil separation cache tank 1, a waste water adjusting tank 2, an electrolytic flocculation device 3, a coagulation sedimentation device 4, an intermediate water tank 5, an air flotation machine 6, a clean water tank 7, an A/O reaction tank 8 and a membrane bioreactor 9 which are sequentially arranged.
The process wastewater is the wastewater produced by hydrogen peroxide by an anthraquinone process, and other wastewater does not contain floating oil and has COD less than 3000 mg/L. The oil removal buffer tank 1 is used for removing oil from the process wastewater to form oil-removed wastewater, and the oil-removed wastewater has the oil-removing effect that the removal rate of floating oil is more than 95%, the removal rate of suspended oil is less than 60%, and the removal rate of emulsified oil is less than 10%; the waste water adjusting tank 2 is used for receiving other waste water in a plant area and mixing the waste water with deoiling waste water, and the ratio of the water amount of the process waste water to the water amount of the other waste water is about 1:2 so as to achieve the effects of adjusting the water quality and stabilizing the water amount of a system; the electrolytic flocculation equipment 3 is used for treating the effluent of the wastewater adjusting tank 2 to produce a first precipitate concentrated solution and first sewage, and has the treatment effects of oil removal rate of more than 97%, COD removal rate of more than 85%, phosphorus removal rate of more than 80%, nitrogen removal rate of more than 40% and ammonia nitrogen removal rate of more than 40%; the coagulating sedimentation equipment 4 is used for treating the first sewage to produce a second precipitated concentrated solution and second sewage, and the treatment effect is that the COD removal rate is more than 30%; the air flotation machine 6 is used for treating the second sewage to produce a third precipitated concentrated solution and third sewage, and the third sewage meets the standard: COD is less than 1000mg/L, suspended solids are less than 20 mg/L; the A/O reaction tank 8 is used for treating third sewage to produce first biochemical sludge and fourth sewage, the membrane bioreactor 9 is used for treating fourth sewage to produce second biochemical sludge and standard-reaching discharge sewage, and the standard-reaching discharge sewage meets the primary standard of comprehensive sewage discharge standard GB 8978-.
The input end of the sludge storage tank 10 is connected with the output end of the electrolytic flocculation device 3, the output end of the coagulation sedimentation device 4, the output end of the air flotation machine 6, the output end of the A/O reaction tank 8 and the output end of the membrane bioreactor 9, and is used for storing a first sedimentation concentrated solution, a second sedimentation concentrated solution, a third sedimentation concentrated solution, first biochemical sludge and second biochemical sludge. The sludge storage tank 10 is periodically transported outside and centrally treated.
The oil separation buffer tank 1, the wastewater adjusting tank 2, the electrolytic flocculation device 3, the coagulating sedimentation device 4, the intermediate water tank 5, the air floatation machine 6, the clean water tank 7, the A/O reaction tank 8 and the membrane bioreactor 9 are all provided with a waste gas collecting cover for collecting and treating waste gas generated in the technical process.
Based on the treatment system, the invention provides a treatment method for treating wastewater generated in the production of hydrogen peroxide by an anthraquinone process by an electrolytic flocculation method, which comprises the following steps:
step (1): the process wastewater is subjected to deoiling treatment in an oil separation cache tank 1 to produce deoiling wastewater; the deoiling wastewater enters a wastewater adjusting tank 2 through a pump and is mixed with other wastewater; the process wastewater is the wastewater produced by hydrogen peroxide by an anthraquinone process, and other wastewater does not contain floating oil and has COD less than 3000 mg/L; the oil removal treatment effect of the oil removal buffer tank 1 is that the oil floating removal rate is more than 95%, the oil suspension removal rate is less than 60%, and the emulsified oil removal rate is less than 10%;
step (2): mixed waste water gets into electrolysis flocculation equipment 3 through the pump sending after, add medicine through PH and adjust the PH value of 3 inside waste water of electrolysis flocculation equipment and be 5-6 after, take place electrocatalytic oxidation, electro-Fenton, electrolytic flocculation, the first concentrated solution of deposiing and first sewage of electrolysis air supporting reaction output in the electrolysis flocculation equipment 3, wherein the electro-Fenton positive pole is the iron electrode, the treatment effect of this process is that deoiling rate > 97%, the COD clearance > 85%, the phosphorus clearance > 80%, the nitrogen clearance > 40%, the ammonia nitrogen clearance > 40%;
wherein the first precipitation pus contains most organic pollutants and pollutant ions such as ammonia nitrogen, phosphorus and the like, and is discharged into the sludge storage tank 10, and the first sewage enters the coagulating sedimentation equipment 4;
and (3): after the PH value of the first sewage in the coagulating sedimentation equipment 4 is adjusted to be 8-9 by adding PH, PAC and PAM are added, the first sewage produces a second sedimentation concentrated solution and second sewage, and the treatment standard of the process is that the COD removal rate is more than 30%; the second precipitation concentrated solution contains solid particles, colloid, oil and other pollutants, is coagulated and is discharged into a sludge storage tank 10, the second sewage enters the air flotation machine 6 through the intermediate water tank 5, and the intermediate water tank 5 plays a role in water quantity regulation and precipitation;
and (4): adding PAC and PAM into the second sewage in the air flotation machine 6, introducing micro bubbles, sinking the large-size flocculating constituent to produce a third precipitated concentrated solution, removing the small-size flocculating constituent through a scum board after the small-size flocculating constituent floats upwards, producing third sewage from the second sewage, wherein the third precipitated concentrated solution contains small-size solid particles, colloids, oils and other pollutants, is coagulated and is discharged into a sludge storage tank 10; the third sewage meets the standard: COD is less than 1000mg/L, suspended solids are less than 20 mg/L;
and (5): the third sewage enters an A/O reaction tank 8 through a clean water tank 7 by pumping, the third sewage is treated by the A/O reaction tank 8 to produce first biological sludge and fourth sewage, wherein the first biological sludge contains micromolecular organic pollutants, nitrogen, phosphorus and other substances and is discharged into a sludge storage tank 10, and the fourth sewage enters a membrane bioreactor 9;
and (6): treating the fourth sewage by a membrane bioreactor 9 to produce standard-reaching discharge sewage and second biochemical sludge, wherein the standard-reaching discharge sewage meets the primary standard of the comprehensive sewage discharge standard GB 8978-;
and (7): the sludge storage tank 10 is periodically shipped for disposal.
The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (8)
1. A treatment system for treating wastewater produced by anthraquinone process hydrogen peroxide production by an electrolytic flocculation method is characterized in that: comprises a sludge storage tank (10), and an oil separation buffer tank (1), a wastewater adjusting tank (2), electrolytic flocculation equipment (3), coagulating sedimentation equipment (4), an intermediate water tank (5), an air floatation machine (6), a clean water tank (7), an A/O reaction tank (8) and a membrane bioreactor (9) which are arranged in sequence;
the oil removal cache pool (1) is used for performing oil removal treatment on process wastewater to form oil removal wastewater, and the process wastewater is anthraquinone process hydrogen peroxide production wastewater containing high-concentration refractory organic pollutants; the waste water adjusting tank (2) is used for receiving oil-removing waste water and other waste water of a factory area and stabilizing the water quantity of the system; the electrolytic flocculation equipment (3) is used for treating the effluent of the wastewater adjusting tank (2) to produce a first precipitation concentrated solution and first sewage; the coagulating sedimentation equipment (4) is used for treating the first sewage to produce a second sedimentation concentrated solution and second sewage; the middle water tank (5) is used for receiving and storing second sewage; the air floatation machine (6) is used for treating the second sewage to produce a third precipitation concentrated solution and third sewage; the clean water tank (7) is used for receiving and storing third sewage; the A/O reaction tank (8) is used for treating third sewage to produce first chemical sludge and fourth sewage; the membrane bioreactor (9) is used for treating fourth sewage to produce second biochemical sludge and sewage which reaches the standard and is discharged;
the input end of the sludge storage tank (10) is connected with the electrolytic flocculation equipment (3), the coagulating sedimentation equipment (4), the air flotation machine (6), the A/O reaction tank (8) and the membrane bioreactor (9) and is used for storing a first precipitation concentrated solution, a second precipitation concentrated solution, a third precipitation concentrated solution, first biochemical sludge and second biochemical sludge;
the sludge storage tank (10) is periodically transported out for centralized treatment.
2. The electrolytic flocculation method treatment anthraquinone process hydrogen peroxide production wastewater treatment system according to claim 1, characterized in that: the other waste water is waste water in which the grease mainly exists in emulsified oil.
3. The electrolytic flocculation method treatment anthraquinone process hydrogen peroxide production wastewater treatment system according to claims 1 to 2, characterized in that: the oil removal buffer tank (1), the wastewater adjusting tank (2), the electrolytic flocculation equipment (3), the coagulating sedimentation equipment (4), the intermediate water tank (5), the air flotation machine (6), the clean water tank (7), the A/O reaction tank (8) and the membrane bioreactor (9) are all provided with a waste gas collecting cover for collecting and treating waste gas generated in the technical process.
4. A treatment method for treating wastewater produced in production of hydrogen peroxide by an anthraquinone process by an electrolytic flocculation method is characterized in that the treatment system for treating wastewater produced in production of hydrogen peroxide by the anthraquinone process by the electrolytic flocculation method as claimed in any one of claims 1 to 3 comprises the following steps:
step (1): the process wastewater is deoiled by an oil separation buffer tank (1) to produce deoiled wastewater; the deoiling wastewater enters a wastewater adjusting tank (2) to be mixed with other wastewater; the process wastewater is the wastewater produced by hydrogen peroxide by an anthraquinone process;
step (2): after the effluent of the wastewater adjusting tank (2) enters the electrolytic flocculation equipment (3), the PH value of the wastewater in the electrolytic flocculation equipment (3) is adjusted to 5-6 by adding chemicals into PH, the environment required by electrolytic flocculation is reached, and the electrolytic flocculation operation is started; a first precipitation concentrated solution and first sewage are generated by reaction in the electrolytic flocculation equipment (3), the first precipitation concentrated solution enters a sludge storage tank (10), and the first sewage enters the coagulation sedimentation equipment (4);
and (3): after the PH value of the first sewage in the coagulating sedimentation equipment (4) is adjusted to be 8-9 by adding PH drugs, PAC and PAM are added, the first sewage produces a second precipitation concentrated solution and second sewage, the second precipitation concentrated solution enters a sludge storage tank (10), and the second sewage enters an air flotation machine (6) through an intermediate water tank (5);
and (4): PAC and PAM are added into the second sewage in the air flotation machine (6), and micro bubbles are introduced, so that large-size flocculating constituents sink, small-size flocculating constituents are removed by air flotation, the second sewage produces third precipitated concentrated solution and third sewage, and the third precipitated concentrated solution enters a sludge storage tank (10);
and (5): the third sewage enters an A/O reaction tank (8) through a clean water tank (7), the third sewage is treated by the A/O reaction tank (8) to produce first biochemical sludge and fourth sewage, the first biochemical sludge enters a sludge storage tank (10), and the fourth sewage enters a membrane bioreactor (9);
and (6): the fourth sewage is treated by a membrane bioreactor (9) to produce standard-reaching discharge sewage and second biochemical sludge, and the second biochemical sludge enters a sludge storage tank (10);
and (7): the sludge storage tank (10) is periodically transported out for treatment.
5. The electrolytic flocculation method for treating wastewater produced in the production of hydrogen peroxide by an anthraquinone process according to claim 4, which is characterized in that: in the step (1), the deoiling treatment has the effects that the floating oil removal rate is more than 95%, the suspension oil removal rate is less than 60%, and the emulsified oil removal rate is less than 10%.
6. The electrolytic flocculation method for treating wastewater produced in the production of hydrogen peroxide by an anthraquinone process according to claim 5, which is characterized in that: in the step (2), the electrolytic flocculation equipment (3) has the effects of oil removal rate of more than 97%, COD removal rate of more than 85%, phosphorus removal rate of more than 80%, nitrogen removal rate of more than 40% and ammonia and nitrogen removal rate of more than 40% on mixed wastewater treatment.
7. The electrolytic flocculation method for treating wastewater produced in the production of hydrogen peroxide by an anthraquinone process according to claim 6, which is characterized in that: in the step (3), the effect of the coagulating sedimentation equipment (4) on the first sewage treatment is that the COD removal rate is more than 30%.
8. The electrolytic flocculation method for treating wastewater produced in the production of hydrogen peroxide by an anthraquinone process according to claim 7, which is characterized in that: in the step (4), the third sewage meets the standard: COD is less than 1000mg/L, suspended solids are less than 20 mg/L; the sewage discharged after reaching the standard meets the primary standard of the comprehensive sewage discharge standard GB 8978-.
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