CN105693028A - Eliminating system and method for wastewater biological toxicity in industrial park - Google Patents
Eliminating system and method for wastewater biological toxicity in industrial park 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
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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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
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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
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention relates to an eliminating system and method for wastewater biological toxicity in an industrial park. The system comprises an adjusting tank, a micro-aerobic denitrification decarburization tank, a precipitation tank, a primary coagulative precipitation tank, a primary sand filter, a catalytic ozonation system, a suspension attachment anaerobic hydrolysis acidification tank, a biological aerated filter, a secondary coagulative precipitation tank, a secondary sand filter and an ultraviolet disinfection trench. The eliminating method comprises the steps of adjusting treatment, micro-aerobic denitrification decarburization treatment, primary coagulation precipitation, primary filtering, catalytic ozonation, anaerobic hydrolysis acidification treatment, decarburization and detoxification treatment, secondary coagulation precipitation, secondary filtering and backflow and ultraviolet disinfection treatment. The eliminating method can effectively degrade biological toxicity of wastewater in the industrial park, ensure conventional water quality detection indexes of outflow water and long-term stable standards of comprehensive biological toxicity and reduce secondary pollution of wastewater to the environment.
Description
Technical Field
The invention belongs to the field of industrial park wastewater treatment, and particularly relates to a system and a method for eliminating biotoxicity of industrial park wastewater.
Background
Industrial waste water, in particular waste water in industrial parks, contains various pollutants which are toxic and harmful to the ecological environment, such as heavy metals, chloroaniline, chloronitrobenzene, cyanogen and other toxic and harmful substances which threaten human health and ecological safety. Passing only CODcr、BOD5And conventional water quality indexes such as ammonia nitrogen and the like cannot objectively and accurately evaluate the water quality safety performance of the wastewater. In this regard, conventional water quality monitoring is proposedThe industrial wastewater quality evaluation index system formed by the measurement index, the characteristic water quality index and the comprehensive biotoxicity index is one of important indexes for evaluating the effluent of the industrial wastewater to reach the standard, wherein the comprehensive biotoxicity index is more and more emphasized by society.
The sewage discharge standard of China generally pursues low COD, and especially the attention degree of people to environmental protection work in recent years is improved, and the requirement on COD discharge value is stricter. However, most industrial wastewater cannot be treated by a simple biological method due to its own properties, and the effluent COD can reach the discharge standard. However, researches show that most of advanced treatment methods only reduce the COD value of effluent and greatly improve the comprehensive biotoxicity index.
With the increasing environmental requirements, an advanced sewage treatment process method which can meet the stricter sewage discharge standard and ensure the ecological safety performance of effluent is sought, the sewage treatment process which takes COD as the primary control target is not completely beneficial to the safe discharge of effluent, and the introduction of a chemical strengthening treatment process can increase the ecological risk of effluent to a certain extent. At present, relatively more detection methods for the biological toxicity of wastewater are developed and researched, and relatively less research is carried out on how to eliminate the biological toxicity of wastewater, particularly wastewater in an industrial park, through a reasonable treatment process.
Disclosure of Invention
Based on the problems in the prior art, the invention provides a system and a method for eliminating the biotoxicity of industrial park wastewater, which can treat industrial park comprehensive wastewater with poor biodegradability and high comprehensive biotoxicity, the effluent quality of the treated industrial park comprehensive wastewater can stably reach the first-class A standard (GB18918-2002), and simultaneously the comprehensive biotoxicity is effectively reduced, so that the effluent cannot threaten the ecological environment.
In order to solve the above technical problems, the present invention provides a system for eliminating biotoxicity of wastewater in an industrial park, comprising:
the system comprises a regulating tank, a micro-aerobic denitrification decarbonization tank, a sedimentation tank, a primary coagulating sedimentation tank, a primary sand filter, an ozone catalytic oxidation system, a suspended attached anaerobic hydrolysis acidification tank, an aeration biological filter, a secondary coagulating sedimentation tank, a secondary sand filter and an ultraviolet disinfection channel; wherein,
the regulating tank is provided with a water inlet for introducing the comprehensive wastewater of the industrial park;
the adjusting tank is sequentially connected with the micro-aerobic denitrification decarbonization tank, the sedimentation tank, the primary coagulating sedimentation tank, the primary sand filter tank, the ozone catalytic oxidation system, the suspended attached anaerobic hydrolysis acidification tank, the aeration biological filter tank, the secondary coagulating sedimentation tank, the secondary sand filter tank and the ultraviolet disinfection channel;
the primary coagulation sedimentation tank is provided with a PAC and PAM feeding device;
the secondary coagulation sedimentation tank is provided with a PAC and PAM feeding device;
the micro-aerobic denitrification decarburization pool is provided with a first external carbon source supplementing device;
a second external carbon source supplementing device is arranged on the suspension adhesion anaerobic hydrolysis acidification tank;
the water outlet of the secondary sand filter is connected to the water inlet of the ozone catalytic oxidation system through a return pipe;
the ultraviolet disinfection canal is provided with a standard water outlet.
The embodiment of the invention also provides a method for eliminating the biological toxicity of the wastewater in the industrial park, and the system comprises the following steps:
(1) and (3) adjusting: the comprehensive wastewater of the industrial park enters a regulating tank for water quality homogenization and regulation treatment;
(2) micro-aerobic denitrification and decarburization treatment: the wastewater after the adjustment treatment enters an micro-aerobic denitrification and decarburization tank for micro-aerobic denitrification and decarburization treatment, the sludge concentration in the micro-aerobic denitrification and decarburization tank is 5000-6000 mg/L, the retention time is not less than 8h, the B/C is more than 0.2, and the dissolved oxygen is 0.2-0.6 mg/L;
(3) primary coagulating sedimentation: precipitating the effluent after the micro-aerobic denitrification and decarburization treatment, then feeding the effluent into a primary coagulation sedimentation tank, adding PAC and PAM into the wastewater for primary coagulation sedimentation, wherein the PAC addition amount in each liter of wastewater is 10-1000 mg, the PAM addition amount is 0.5-5 mg, and the surface load of the primary coagulation sedimentation tank is 1-2 m3/m2·h；
(4) Primary filtration: the effluent after the primary coagulation sedimentation enters a primary sand filter for primary filtration to remove suspended matters in the wastewater;
(5) ozone catalytic oxidation treatment: the effluent after primary filtration enters an ozone catalytic oxidation system for ozone catalytic oxidation treatment, a catalyst in an ozone catalytic oxidation tank of the ozone catalytic oxidation system is granular activated carbon, the ozone adding amount of each liter of wastewater is 10-1000 mg/L, the reaction time is 1h, and the stability is 30 min;
(6) anaerobic hydrolysis acidification treatment: the ozone effluent after the catalytic oxidation treatment of ozone enters a suspension adhesion anaerobic hydrolysis acidification tank for anaerobic hydrolysis acidification treatment, the hydraulic retention time is 6-24 h, flexible suspension fillers are arranged in the suspension adhesion anaerobic hydrolysis acidification tank, a carbon source is added, and the B/C is more than 0.2;
(7) decarbonization and detoxification treatment: the effluent after the anaerobic hydrolysis acidification treatment enters an aeration biological filter for treatment, and the hydraulic retention time is 2-8 h;
(8) secondary coagulating sedimentation: the effluent treated by the biological aerated filter enters a secondary coagulation sedimentation tank, PAC and PAM are added into the wastewater for secondary coagulation sedimentation, the adding amount of PAC in each liter of wastewater is 10-500 mg, the adding amount of PAM is 0.5-5 mg, and the surface load of the secondary coagulation sedimentation treatment tank is 0.5-2 m3/m2·h；
(9) Secondary filtration: the effluent after the secondary coagulation sedimentation enters a secondary sand filter for secondary filtration to remove suspended matters in the wastewater;
(10) and (3) disinfection treatment: and the effluent after the secondary filtration flows back to the ozone catalytic oxidation tank at the front section, then ozone catalytic oxidation treatment, anaerobic hydrolysis acidification treatment, aeration biological filter treatment and secondary filtration are sequentially carried out, and the effluent after the secondary filtration enters an ultraviolet disinfection channel for ultraviolet disinfection treatment to obtain standard water to be discharged outside.
The invention has the beneficial effects that: degrading the biochemical part in the regulated wastewater in a micro-aerobic denitrification decarbonization tank, and then removing insoluble COD in the wastewater by coagulating sedimentation and sand filtration, then enters an ozone catalytic oxidation system to break the ring and chain of macromolecular organic matters, enters a suspended attached anaerobic hydrolysis acidification tank to further break the ring and chain, finally enters an aeration biological filter to perform decarburization and detoxification treatment, meanwhile, the method of refluxing 100 percent of the secondary sand filtration effluent to the ozone inlet is adopted, so that the treatment efficiency of ozone and ozone post-biochemical treatment is effectively improved, the treatment mode realizes the optimal combination of the catalytic oxidation of the ozone and the biological treatment process, can ensure that the conventional monitoring indexes in the effluent reach the standard stably for a long time and greatly reduce the biological toxicity of the effluent, thereby achieving the effects of ensuring that the effluent reaches the standard, eliminating the biotoxicity of the effluent and reducing the secondary pollution of the waste water to the environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for eliminating biological toxicity in wastewater from an industrial park according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for eliminating biological toxicity of wastewater from an industrial park according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a system for eliminating biotoxicity of wastewater in an industrial park, which can ensure that effluent reaches the standard and eliminate biotoxicity of the effluent, and includes:
the system comprises a regulating tank, a micro-aerobic denitrification decarbonization tank, a sedimentation tank, a primary coagulating sedimentation tank, a primary sand filter, an ozone catalytic oxidation system, a suspended attached anaerobic hydrolysis acidification tank, an aeration biological filter, a secondary coagulating sedimentation tank, a secondary sand filter and an ultraviolet disinfection channel; wherein,
the regulating tank is provided with a water inlet for introducing the comprehensive wastewater of the industrial park;
the adjusting tank is sequentially connected with the micro-aerobic denitrification decarbonization tank, the sedimentation tank, the primary coagulating sedimentation tank, the primary sand filter tank, the ozone catalytic oxidation system, the suspended attached anaerobic hydrolysis acidification tank, the aeration biological filter tank, the secondary coagulating sedimentation tank, the secondary sand filter tank and the ultraviolet disinfection channel;
the primary coagulation sedimentation tank is provided with a PAC and PAM feeding device;
the secondary coagulation sedimentation tank is provided with a PAC and PAM feeding device;
the micro-aerobic denitrification decarburization pool is provided with a first external carbon source supplementing device;
a second external carbon source supplementing device is arranged on the suspension adhesion anaerobic hydrolysis acidification tank;
the water outlet of the secondary sand filter is connected to the water inlet of the ozone catalytic oxidation system through a return pipe;
the ultraviolet disinfection canal is provided with a standard water outlet.
In the elimination system, the primary sand filter and the secondary sand filter both adopt quartz sand filters, and the filtering speed of the quartz sand filter adopted by the primary sand filter is 5-10 m/h.
As shown in FIG. 2, the embodiment of the present invention further provides a method for eliminating biological toxicity of wastewater from an industrial park, which employs the above-mentioned elimination system, and comprises the following steps:
(1) and (3) adjusting: the comprehensive wastewater of the industrial park enters a regulating tank for water quality homogenization and regulation treatment; preferably, the wastewater is subjected to water quality homogenization regulation treatment for not less than 24 hours in a regulation tank;
(2) micro-aerobic denitrification and decarburization treatment: the wastewater after the adjustment treatment enters an micro-aerobic denitrification and decarburization tank for micro-aerobic denitrification and decarburization treatment, the sludge concentration in the micro-aerobic denitrification and decarburization tank is 5000-6000 mg/L, the retention time is not less than 8h, the B/C is more than 0.2, and the dissolved oxygen is 0.2-0.6 mg/L;
(3) primary coagulating sedimentation: precipitating the effluent after the micro-aerobic denitrification and decarburization treatment, then feeding the effluent into a primary coagulation sedimentation tank, adding PAC and PAM into the wastewater for primary coagulation sedimentation, wherein the PAC addition amount in each liter of wastewater is 10-1000 mg, the PAM addition amount is 0.5-5 mg, and the surface load of the primary coagulation sedimentation tank is 1-2 m3/m2·h；
(4) Primary filtration: the effluent after the primary coagulation sedimentation enters a primary sand filter for primary filtration to remove suspended matters in the wastewater; preferably, the primary sand filter adopts a quartz sand filter, and the filtering speed of the quartz sand filter is 5-10 m/h;
(5) ozone catalytic oxidation treatment: the effluent after primary filtration enters an ozone catalytic oxidation system for ozone catalytic oxidation treatment, a catalyst in an ozone catalytic oxidation tank of the ozone catalytic oxidation system is granular activated carbon, the ozone adding amount of each liter of wastewater is 10-1000 mg/L, the reaction time is 1h, and the stability is 30 min;
(6) anaerobic hydrolysis acidification treatment: the ozone effluent after the catalytic oxidation treatment of ozone enters a suspension adhesion anaerobic hydrolysis acidification tank for anaerobic hydrolysis acidification treatment, the hydraulic retention time is 6-24 h, flexible suspension fillers are arranged in the suspension adhesion anaerobic hydrolysis acidification tank, a carbon source is added, and the B/C is more than 0.2;
(7) decarbonization and detoxification treatment: the effluent after the anaerobic hydrolysis acidification treatment enters an aeration biological filter for treatment, and the hydraulic retention time is 2-8 h;
(8) secondary coagulating sedimentation: the effluent after the decarbonization and detoxification treatment enters a secondary coagulation sedimentation tank, PAC and PAM are added into the wastewater for secondary coagulation sedimentation, the adding amount of PAC in each liter of wastewater is 10-500 mg, the adding amount of PAM is 0.5-5 mg, and the surface load of the secondary coagulation sedimentation treatment tank is 0.5-2 m3/m2·h；
(9) Secondary filtration: the effluent after the secondary coagulation sedimentation enters a secondary sand filter for secondary filtration to remove suspended matters in the wastewater; preferably, the second-stage sand filter adopts a quartz sand filter;
(10) and (3) disinfection treatment: and the effluent after the secondary filtration flows back to the ozone catalytic oxidation tank at the front section, then ozone catalytic oxidation treatment, anaerobic hydrolysis acidification treatment, aeration biological filter treatment and secondary filtration are sequentially carried out, and the effluent after the secondary filtration enters an ultraviolet disinfection channel for ultraviolet disinfection treatment to obtain standard water to be discharged outside.
The elimination method of the present invention will be further described with reference to specific examples.
In this embodiment, the method for eliminating sewage in a comprehensive industrial park of north and lake Xiangyang is described by using the system for eliminating sewage of the present invention as an example: the complex type of the enterprises in the park mainly comprises various heavily polluted enterprises such as biomedicine, fine chemical industry, coal chemical industry, pesticide and fertilizer, textile printing and dyeing and the like. The wastewater of the comprehensive sewage treatment plant in the park has complex components and poor biodegradability. The water quality of the wastewater in the park is regulated for 24 hours in the regulating pond, and the conventional water quality monitoring data of the inlet water is shown in the table 1. Firstly, the regulated wastewater enters a micro-aerobic denitrification and decarbonization tank, wherein the dissolved oxygen of the biological treatment unit is controlled to be 0.2-0.5 mg/L, the water conservancy retention time is 8h, and 50mg/L of glucose is added; feeding the precipitated effluent into a primary coagulation sedimentation tank, adding PAC and PAM into the primary coagulation sedimentation tank, wherein the adding amounts of PAC and PAM are 100mg/L and 1mg/L respectively, and feeding the coagulated supernatant into a primary sand filter for filtering; the filtered wastewater enters an ozone catalytic oxidation system, granular activated carbon is used as a catalyst in the ozone catalytic oxidation system to carry out catalytic ozone oxidation, the adding amount of ozone is 50mg/L, the reaction time is controlled to be about 1h, and then the wastewater is stabilized after 30 min; the effluent enters a suspension adhesion anaerobic hydrolysis acidification tank, the hydraulic retention time in the suspension adhesion anaerobic hydrolysis acidification tank is 6 hours, the effluent enters an aeration biological filter for decarburization and detoxification, and the hydraulic retention time is 4 hours; the effluent of the biological aerated filter enters a secondary coagulation sedimentation tank, the adding amount of PAC and PAM in the secondary coagulation sedimentation tank is 50mg/L and 1mg/L respectively, and the supernatant after coagulation enters a secondary sand filter for secondary filtration; 100% of the effluent after the secondary filtration flows back to the ozone catalytic oxidation system, so that the ozone and biochemical treatment efficiency is effectively improved, the effluent is ensured to stably reach the standard for a long time and has low biological toxicity, and the conventional water quality monitoring data of the effluent is shown in table 1.
Table 1: the quality of the inlet water and the outlet water of the wastewater treated by the elimination method of the invention
In this example, the comprehensive toxicity of wastewater from the intake park and the effluent treated by the elimination method of the present invention was tested by the comprehensive toxicity test of the effluent. Exposing medaka juvenile fish in inlet water with different dilutions and treated water samples for 96h, and carrying out acute toxic mortality statistics, wherein the statistical data are shown in table 2. The results show that the effluent treated by the elimination method of the invention does not show 96h semilethal concentration within the tested concentration range, i.e. LC50> 100% dilution, whereas the 96 h-LC 50 dilution of the influent is 32.3% and the mortality rate in the experimental raw water is 100%.
Table 2: 96h acute toxic mortality rate of medaka juvenile fish
Diluting the water samples after water inflow and treatment according to different dilutions, exposing medaka embryos to different water samples, and counting the hatchability of the medaka embryos, wherein the counting result is shown in table 3. The results show that the chronic toxicity of the wastewater is greatly reduced after the treatment by the elimination method of the invention.
TABLE 3 Chronic toxicity of embryo-juvenile fish exposed to wastewater
The elimination system and the elimination method of the invention degrade the biochemical part of the regulated wastewater in a micro-aerobic denitrification decarbonization tank, remove insoluble COD in the wastewater by coagulating sedimentation and sand filtration, then enter an ozone catalytic oxidation system to break the ring and break the chain of macromolecular organic matters, enter a suspended attached anaerobic hydrolysis acidification tank to further break the ring and break the chain, finally enter an aeration biological filter tank to carry out decarbonization and detoxification treatment, simultaneously adopt a mode of refluxing 100 percent of secondary sand filtered water to ozone inlet water, effectively improve the treatment efficiency of ozone and ozone post-biochemical treatment, realize the optimal combination of ozone catalytic oxidation and biological treatment process, ensure that the conventional monitoring index in the outlet water reaches the standard stably for a long time and greatly reduce the biological toxicity of the outlet water, thereby ensuring the outlet water to reach the standard and eliminating the biological toxicity of the outlet water, the secondary pollution of the waste water to the environment is reduced.
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 changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An industrial park wastewater biotoxicity elimination system, comprising:
the system comprises a regulating tank, a micro-aerobic denitrification decarbonization tank, a sedimentation tank, a primary coagulating sedimentation tank, a primary sand filter, an ozone catalytic oxidation system, a suspended attached anaerobic hydrolysis acidification tank, an aeration biological filter, a secondary coagulating sedimentation tank, a secondary sand filter and an ultraviolet disinfection channel; wherein,
the regulating tank is provided with a water inlet for introducing the comprehensive wastewater of the industrial park;
the adjusting tank is sequentially connected with the micro-aerobic denitrification decarbonization tank, the sedimentation tank, the primary coagulating sedimentation tank, the primary sand filter tank, the ozone catalytic oxidation system, the suspended attached anaerobic hydrolysis acidification tank, the aeration biological filter tank, the secondary coagulating sedimentation tank, the secondary sand filter tank and the ultraviolet disinfection channel;
the primary coagulation sedimentation tank is provided with a PAC and PAM feeding device;
the secondary coagulation sedimentation tank is provided with a PAC and PAM feeding device;
the micro-aerobic denitrification decarburization pool is provided with a first external carbon source supplementing device;
a second external carbon source supplementing device is arranged on the suspension adhesion anaerobic hydrolysis acidification tank;
the water outlet of the secondary sand filter is connected to the water inlet of the ozone catalytic oxidation system through a return pipe;
the ultraviolet disinfection canal is provided with a standard water outlet.
2. The system for eliminating the biotoxicity of the wastewater in the industrial park as claimed in claim 1, wherein the primary sand filter tank adopts a quartz sand filter, and the filtering speed of the quartz sand filter is 5-10 m/h.
3. The system for the elimination of biotoxicity of wastewater from industrial park as claimed in claim 1 or 2, wherein the secondary sand filter employs a quartz sand filter.
4. A method for the elimination of biotoxicity of wastewater from industrial parks, characterized in that the system according to any one of claims 1 to 3 is used, comprising the following steps:
(1) and (3) adjusting: the comprehensive wastewater of the industrial park enters a regulating tank for water quality homogenization and regulation treatment;
(2) micro-aerobic denitrification and decarburization treatment: the wastewater after the adjustment treatment enters an micro-aerobic denitrification and decarburization tank for micro-aerobic denitrification and decarburization treatment, the sludge concentration in the micro-aerobic denitrification and decarburization tank is 5000-6000 mg/L, the retention time is not less than 8h, the B/C is more than 0.2, and the dissolved oxygen is 0.2-0.6 mg/L;
(3) primary coagulating sedimentation:precipitating the effluent after the micro-aerobic denitrification and decarburization treatment, then feeding the effluent into a primary coagulation sedimentation tank, adding PAC and PAM into the wastewater for primary coagulation sedimentation, wherein the PAC addition amount in each liter of wastewater is 10-1000 mg, the PAM addition amount is 0.5-5 mg, and the surface load of the primary coagulation sedimentation tank is 1-2 m3/m2·h；
(4) Primary filtration: the effluent after the primary coagulation sedimentation enters a primary sand filter for primary filtration to remove suspended matters in the wastewater;
(5) ozone catalytic oxidation treatment: the effluent after primary filtration enters an ozone catalytic oxidation system for ozone catalytic oxidation treatment, a catalyst in an ozone catalytic oxidation tank of the ozone catalytic oxidation system is granular activated carbon, the ozone adding amount of each liter of wastewater is 10-1000 mg/L, the reaction time is 1h, and the stability is 30 min;
(6) anaerobic hydrolysis acidification treatment: the ozone effluent after the catalytic oxidation treatment of ozone enters a suspension adhesion anaerobic hydrolysis acidification tank for anaerobic hydrolysis acidification treatment, the hydraulic retention time is 6-24 h, flexible suspension fillers are arranged in the suspension adhesion anaerobic hydrolysis acidification tank, a carbon source is added, and the B/C is more than 0.2;
(7) decarbonization and detoxification treatment: the effluent after the anaerobic hydrolysis acidification treatment enters an aeration biological filter for treatment, and the hydraulic retention time is 2-8 h;
(8) secondary coagulating sedimentation: the effluent after the decarbonization and detoxification treatment enters a secondary coagulation sedimentation tank, PAC and PAM are added into the wastewater for secondary coagulation sedimentation, the adding amount of PAC in each liter of wastewater is 10-500 mg, the adding amount of PAM is 0.5-5 mg, and the surface load of the secondary coagulation sedimentation treatment tank is 0.5-2 m3/m2·h；
(9) Secondary filtration: the effluent after the secondary coagulation sedimentation enters a secondary sand filter for secondary filtration to remove suspended matters in the wastewater;
(10) and (3) disinfection treatment: and the effluent after the secondary filtration flows back to the ozone catalytic oxidation tank at the front section, then ozone catalytic oxidation treatment, anaerobic hydrolysis acidification treatment, aeration biological filter treatment and secondary filtration are sequentially carried out, and the effluent after the secondary filtration enters an ultraviolet disinfection channel for ultraviolet disinfection treatment to obtain standard water to be discharged outside.
5. The method for eliminating the biotoxicity of the industrial park wastewater as claimed in claim 4, wherein in the adjusting treatment of the step (1), the comprehensive wastewater of the industrial park enters an adjusting tank to be subjected to water quality homogenization adjusting treatment for not less than 24 hours.
6. The method for eliminating the biotoxicity of the wastewater in the industrial park as claimed in claim 4 or 5, wherein in the primary filtration of the step (4), a quartz sand filter is adopted as the primary sand filter, and the filtering speed of the quartz sand filter is 5-10 m/h.
7. The method for the elimination of biotoxicity of wastewater from industrial park as claimed in claim 4 or 5, wherein in the secondary filtration of step (9), the secondary sand filter tank adopts a quartz sand filter.
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