WO2024251121A1 - Procédé d'épuration et d'utilisation cyclique d'eaux usées d'élevage d'anguilles et son utilisation - Google Patents

Procédé d'épuration et d'utilisation cyclique d'eaux usées d'élevage d'anguilles et son utilisation Download PDF

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Publication number
WO2024251121A1
WO2024251121A1 PCT/CN2024/097343 CN2024097343W WO2024251121A1 WO 2024251121 A1 WO2024251121 A1 WO 2024251121A1 CN 2024097343 W CN2024097343 W CN 2024097343W WO 2024251121 A1 WO2024251121 A1 WO 2024251121A1
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Prior art keywords
water
eel
breeding wastewater
recycling
eel breeding
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PCT/CN2024/097343
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English (en)
Chinese (zh)
Inventor
孔玲芬
黄全佳
阮鲤萍
刁心刚
黄雅娟
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Haoyu Xiamen Environment Protection Co Ltd
Xiamen Environmental Monitoring Station
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Haoyu Xiamen Environment Protection Co Ltd
Xiamen Environmental Monitoring Station
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Classifications

    • 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
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • 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
    • C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water

Definitions

  • the invention belongs to the technical field of water resource recycling and environmental protection, and in particular relates to a purification and recycling method for eel breeding wastewater and its application.
  • Eel (Anguillidae) belongs to the order Anguilliformes, which is also known as eel, white eel, white eel, river eel, etc., including Asian eel, Japanese eel, bicolor eel, American eel (South American eel and North American eel) and European eel.
  • Eel is rich in high-quality protein and various amino acids and vitamins required by the human body, and contains high content of fish oil. It has high nutritional value and tastes fresh, so it has extremely high economic value for breeding.
  • Eel farming wastewater contains high concentrations of pollutants such as ammonia nitrogen, total nitrogen, total phosphorus and COD Cr . If it is not treated and directly discharged into the environment, it will lead to excessive concentrations of COD Cr , BOD 5 , nitrogen and phosphorus in natural water bodies such as rivers and lakes, as well as eutrophication of water bodies. Therefore, eel farming wastewater must be purified.
  • the concentrations of major pollutants in the discharged wastewater also vary greatly. For example, during the growth process, the bicolor eel eats less bait every day, and the feces it discharges are also less.
  • the ammonia nitrogen, total nitrogen, total phosphorus and COD Cr in the discharged wastewater are all low.
  • the ammonia nitrogen in the discharged wastewater is ⁇ 2mg/L, the total nitrogen is ⁇ 5mg/L, the total phosphorus is ⁇ 3.0mg/L and the COD is ⁇ 30mg/L; the American eel grows faster, and during the growth process, it eats more bait every day, and the feces it discharges are also more.
  • the ammonia nitrogen, total nitrogen, total phosphorus and COD Cr in the discharged wastewater are all high.
  • the ammonia nitrogen in the wastewater is ⁇ 7mg/L
  • the total nitrogen is ⁇ 20mg/L
  • the total phosphorus is ⁇ 3.5mg/L
  • the COD Cr is ⁇ 50mg/L.
  • the concentration of major pollutants in eel farming wastewater is also related to the growth period of eels. In the young and middle-aged period, due to fast growth, eating more and discharging more, the concentrations of major pollutants such as ammonia nitrogen, total nitrogen, total phosphorus and COD Cr in the wastewater are also higher.
  • the concentrations of major pollutants such as ammonia nitrogen, total nitrogen, total phosphorus and COD Cr in the wastewater in winter and summer also show a situation of low concentration in winter and high concentration in summer.
  • the concentration of major pollutants in eel farming wastewater is also closely related to the breeding mode and drainage method.
  • the treatment of eel farming wastewater mainly focuses on the treatment of COD Cr , BOD 5 , ammonia nitrogen and total phosphorus in the wastewater.
  • the main methods include multiple oxidation ponds in series with phosphorus removal agent precipitation, biochemical method, artificial wetland method, and a combination of oxidation ponds and precipitation methods.
  • the purpose of the present invention is to adapt to eel breeding wastewater with different pollution conditions, realize the purification and recycling of eel breeding wastewater, and provide a purification and recycling method and application of eel breeding wastewater.
  • a fiber rotary disc machine with a corresponding filter aperture can be selected for filtration according to the turbidity degree of the eel breeding wastewater.
  • the conventional filter aperture of the fiber rotary disc machine is 5 ⁇ 20 ⁇ m, and specifically can be 5 ⁇ m, 8 ⁇ m, 9 ⁇ m, 10 ⁇ m, 12 ⁇ m, 15 ⁇ m, 16 ⁇ m, 17 ⁇ m, 18 ⁇ m, 19 ⁇ m, 20 ⁇ m or any value therebetween.
  • the volume ratio of clean water and concentrated water obtained in the filtration diversion is regulated to achieve preliminary regulation of the pollution degree of clean water and concentrated water, which is beneficial to subsequent treatment.
  • the volume ratio of the clean water obtained can be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90% or any value therebetween
  • the volume ratio of the concentrated water obtained can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% or any value therebetween.
  • the clean water is treated in a split and combined manner, and the clean water of the first part is first subjected to catalytic electrolysis denitrification, so that the ammonia nitrogen in the water is oxidized to nitrate by the hydroxyl radicals generated by electrolysis during the electrolysis process, and the nitrate is reduced to nitrogen gas by the hydrogen atoms generated by electrolysis, and at the same time, the hydrogen ions, hydroxyl radicals and sodium hypochlorite in the water can react with the ammonia nitrogen and nitrate in the second part to oxidize the ammonia nitrogen in the water to nitrogen gas and reduce the nitrate nitrogen to nitrogen gas.
  • the volume ratio of the first part and the second part can be adaptively adjusted according to the pollution condition of the clean water, which has better adaptability.
  • the standard potential of NH 3 /N 2 is -3.1, which is much lower than the standard potential of H + /H 2 , which is 0. Therefore, the hydroxyl radicals produced by electrolysis first react with ammonia to form nitrates. At the same time, nitrates react with hydrogen atoms produced by electrolysis to form nitrogen.
  • catalytic electrolysis oxidizes organic phosphorus and polyphosphorus in the wastewater into phosphate.
  • clean water treated by catalytic electrolytic denitrification and aeration is discharged into a biological activation pool, and the water body is mixed with a bacterial and algae culture solution for biological activation, and cultured at 20-35°C for 18-36 hours to rebuild the balance of the water body's microecology and restore the activity of the water body.
  • the temperature and time required for bioactivation can be determined according to the conditions of the water body.
  • the temperature of bioactivation can be 20°C, 21°C, 23°C, 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, 32°C, 34°C, 35°C or any value therebetween, and the time can be 18h, 20h, 21h, 23h, 25h, 27h, 28h, 30h, 32h, 34h, 36h or any value therebetween.
  • the microorganisms contained in the bacteria and algae culture solution are selected as microorganisms that are beneficial to the growth of eels, and specifically can be but not limited to photosynthetic bacteria, chlorella, diatoms, spirulina and Bacillus subtilis, used alone or in combination, and the water body is restored to activity by the large-scale reproduction of photosynthetic bacteria, chlorella, diatoms, spirulina and/or Bacillus subtilis.
  • the active substances such as subtilisin, polymyxin, nystatin, gramicidin, etc.
  • Bacillus subtilis produced during the proliferation of Bacillus subtilis have a significant inhibitory effect on pathogenic bacteria, and can stimulate the growth and development of eel immune organs, activate T and B lymphocytes, increase the level of immunoglobulins and antibodies, enhance cellular immunity and humoral immunity, and improve group immunity.
  • Bacillus subtilis can also synthesize VB1 , VB2 , VB6 and nicotinic acid and other B vitamins, and improve the activity of interferon and macrophages in eels; more specifically, the bacterial cell density in the bacteria and algae culture solution is 107 ⁇ 1010 /L.
  • the amount of bacteria and algae culture solution added is 1 ⁇ 5 ⁇ (v/v), that is, 1 ⁇ 5mL of bacteria and algae culture solution is added to 1L of the water sample to be bioactivated. At this time, the concentration of bacteria in the water sample is appropriate, which is conducive to subsequent cultivation and achieves an ideal bioactivation effect.
  • the amount of bacteria and algae culture solution added is 1 ⁇ (v/v), 2 ⁇ (v/v), 3 ⁇ (v/v), 4 ⁇ (v/v), 5 ⁇ (v/v) or any value therebetween.
  • step S3 in the treatment of concentrated water in step S3, flocculants and coagulants are first added to the concentrated water for flotation to remove 90-98% of phosphorus and 40-75% of COD Cr in the concentrated water.
  • the flocculant can be, but is not limited to, one or more of ferrous sulfate, ferrous chloride, basic aluminum chloride, calcium chloride, sodium polyacrylate, polyacrylamide, polystyrene sulfonate and polyethylene oxide; the addition amount is 5-200 mg/L, specifically 5 mg/L, 10 mg/L, 25 mg/L, 50 mg/L, 60 mg/L, 75 mg/L, 80 mg/L, 85 mg/L, 90 mg/L, 95 mg/L, 100 mg/L, 110 mg/L, 115 mg/L, 128 mg/L, 140 mg/L, 150 mg/L, 157 mg/L, 180 mg/L, 190 mg/L, 200 mg/L or any value therebetween.
  • the coagulant aid may be, but is not limited to, polyacrylamide; its addition amount is 0.1-20 mg/L, specifically 0.1 mg/L, 0.5 mg/L, 0.8 mg/L, 1.0 mg/L, 1.5 mg/L, 2.0 mg/L, 5.0 mg/L, 8 mg/L, 10 mg/L, 15 mg/L, 20 mg/L or any value therebetween.
  • the treatment method provided in the present invention also includes the treatment of sludge: collecting the sludge from sedimentation, anaerobic treatment and flotation sludge removal, performing gravity separation and filter pressing to obtain dewatered sludge and filtered water, and the filtered water can enter the concentrated water treatment process and be discharged after purification.
  • the present invention also provides the application of the above eel breeding wastewater purification and recycling method in the treatment of eel breeding wastewater, which can achieve ideal treatment effects on breeding wastewater with different pollution conditions, and the effluent water quality is high, which can be recycled in eel breeding, and the treatment cost is low and the operation is simple, and it has good application prospects.
  • Embodiments of the present invention are described in detail below, and the examples of the embodiments are intended to be used to explain the present invention, but should not be construed as limiting the present invention.
  • specific techniques or conditions are not specified, the techniques or conditions described in the literature in this area or the product specifications are used. If the manufacturer is not specified for reagents or instruments used, they are all conventional products that can be obtained commercially.
  • This embodiment is used to illustrate the purification and recycling method of eel breeding wastewater with a production volume of 3,000 tons/day.
  • the method specifically includes the following steps:
  • the eel farming wastewater is discharged into the sedimentation tank for sedimentation and anaerobic reaction at 25-35°C for 8 hours.
  • solid particles such as feces and residual feed in the eel farming wastewater are removed by sedimentation.
  • the carbon-containing organic matter in the eel farming wastewater is oxidized into CO2 and the organic phosphorus is converted into phosphate through the action of anaerobic microorganisms in the sedimentation tank.
  • the eel farming wastewater that has undergone sedimentation and anaerobic treatment overflows from the sedimentation tank to a fiber rotary disc filter with a filtration pore size of 15 ⁇ m for filtration and diversion.
  • the resulting clean water accounts for 80% of the total effluent volume, and the concentrated water accounts for 20% of the total effluent volume.
  • Catalytic electrolytic denitrification A portion of the clean water obtained by filtering the fiber rotary disc enters the catalytic electrolyzer at a flow rate of 100m3 /h, and catalytic electrolytic denitrification is carried out under the conditions of voltage of 62V and current of 850A;
  • the sludge from the sedimentation tank and the flotation device enters the plate and frame filter press for filtration and dehydration to obtain dehydrated sludge and sludge filtered water, which enters the flotation device for treatment together with concentrated water.
  • the water quality indicators of the inlet and outlet water in each treatment step of this embodiment are shown in Table 1.
  • the wastewater is separated into two paths, one is clean water and the other is concentrated water; the clean water is treated with catalytic electrolytic denitrification, aeration and biological activation, and the effluent COD Cr ⁇ 30mg/L, ammonia nitrogen ⁇ 0.5mg/L, total nitrogen ⁇ 3mg/L and total phosphorus nitrogen ⁇ 0.2mg/L, which can be recycled to the breeding pond for reuse; and the concentrated water is treated with flotation, microfiltration and catalytic electrolytic denitrification, and the effluent COD Cr ⁇ 40mg/L, ammonia nitrogen ⁇ 1.0mg/L, total nitrogen ⁇ 3mg/L and total phosphorus ⁇ 0.5mg/L, which meets the discharge standard.
  • This embodiment is used to illustrate the purification and recycling method of eel breeding wastewater with a production volume of 10,000 tons/day, which specifically includes the following steps:
  • the eel farming wastewater is discharged into the sedimentation tank for sedimentation and anaerobic reaction at 25-35°C for 8 hours.
  • solid particles such as feces and residual feed in the eel farming wastewater are removed by sedimentation.
  • the carbon-containing organic matter in the eel farming wastewater is oxidized into CO2 and the organic phosphorus is converted into phosphate through the action of anaerobic microorganisms in the sedimentation tank.
  • the eel farming wastewater that has undergone sedimentation and anaerobic treatment overflows from the sedimentation tank into a fiber rotary disc filter with a filtration pore size of 10 ⁇ m.
  • the clean water obtained by filtration accounts for 90% of the total effluent volume, and the concentrated water accounts for 10% of the total effluent volume.
  • Catalytic electrolytic denitrification A portion of the clean water obtained by filtering the fiber rotary disc enters the catalytic electrolyzer at a flow rate of 375m3 /h, and catalytic electrolytic denitrification is carried out under the conditions of voltage of 62V and current of 5600A;
  • (1) Flotation The concentrated water obtained by fiber disc filtration enters the flotation device, and 50 mg/L of ferrous sulfate, 50 mg/L of polyethylene oxide and 20 mg/L of polyacrylamide are added to remove phosphorus and organic compounds in the concentrated water by flotation.
  • Catalytic electrolysis denitrification The solution obtained through microfiltration enters the catalytic electrolyzer at a flow rate of 25m3 /h, and catalytic electrolysis denitrification is carried out under the conditions of voltage of 62V and current of 350A. The solution after catalytic electrolysis denitrification enters the gas separation tower, and the nitrogen is discharged from the gas separation tower and meets the emission standards.
  • the sludge from the sedimentation tank and the flotation device enters the plate and frame filter press for filtration and dehydration to obtain dehydrated sludge and sludge filtered water, which enters the flotation device for treatment together with concentrated water.
  • the water quality indicators of the inlet and outlet water in each treatment step of this embodiment are shown in Table 2.
  • the wastewater is separated into two paths, one is clean water and the other is concentrated water; the clean water is treated with catalytic electrolytic denitrification, aeration and biological activation, and the effluent COD Cr ⁇ 40mg/L, ammonia nitrogen ⁇ 0.5mg/L, total nitrogen ⁇ 3mg/L and total phosphorus ⁇ 0.2mg/L, which can be recycled to the breeding pond for reuse; and the concentrated water is treated with flotation, microfiltration and catalytic electrolytic denitrification, and the effluent COD Cr ⁇ 40mg/L, ammonia nitrogen ⁇ 1.0mg/L, total nitrogen ⁇ 3mg/L and total phosphorus ⁇ 0.5mg/L, which meets the discharge standard.
  • This embodiment is used to illustrate the purification and recycling method of eel breeding wastewater with a production volume of 1000 tons/day, which specifically includes the following steps:
  • the eel farming wastewater is discharged into the sedimentation tank for sedimentation and anaerobic reaction at 25-35°C for 8 hours.
  • solid particles such as feces and residual feed in the eel farming wastewater are removed by sedimentation.
  • the carbon-containing organic matter in the eel farming wastewater is oxidized into CO2 and the organic phosphorus is converted into phosphate through the action of anaerobic microorganisms in the sedimentation tank.
  • the eel farming wastewater that has undergone sedimentation and anaerobic treatment is overflowed from the sedimentation tank into a fiber rotary disc filter with a filtration pore size of 20 ⁇ m.
  • the clean water obtained by filtration accounts for 95% of the total effluent volume, and the concentrated water accounts for 5% of the total effluent volume.
  • Catalytic electrolytic denitrification A portion of the clean water obtained by filtering the fiber rotary disc enters the catalytic electrolyzer at a flow rate of 42m3 /h, and catalytic electrolytic denitrification is carried out under the conditions of voltage of 670V and current of 1000A;
  • (1) Flotation The concentrated water obtained by fiber disc filtration enters the flotation device, and 50 mg/L of ferrous sulfate and 10 mg/L of polyacrylamide are added to remove phosphorus and organic compounds in the concentrated water by flotation.
  • Catalytic electrolysis denitrification The solution obtained through microfiltration enters the catalytic electrolyzer at a flow rate of 10m3 /h, and catalytic electrolysis denitrification is carried out under the conditions of voltage of 65V and current of 320A. The solution after catalytic electrolysis denitrification enters the gas separation tower, and the nitrogen is discharged from the gas separation tower and meets the emission standards.
  • the sludge from the sedimentation tank and the flotation device enters the plate and frame filter press for filtration and dehydration to obtain dehydrated sludge and sludge filtered water, which enters the flotation device for treatment together with concentrated water.
  • the water quality indicators of the inlet and outlet water in each treatment step of this embodiment are shown in Table 3.
  • the wastewater is separated into two paths, one is clean water and the other is concentrated water; the clean water is treated with catalytic electrolytic denitrification, aeration and biological activation, and the effluent COD Cr ⁇ 40mg/L, ammonia nitrogen ⁇ 0.5mg/L, total nitrogen ⁇ 3mg/L and total phosphorus ⁇ 0.2mg/L, which can be recycled to the breeding pond for reuse; and the concentrated water is treated with flotation, microfiltration and catalytic electrolytic denitrification, and the effluent COD Cr ⁇ 40mg/L, ammonia nitrogen ⁇ 1.0mg/L, total nitrogen ⁇ 3mg/L and total phosphorus ⁇ 0.5mg/L, which meets the discharge standard.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

La présente invention se rapporte aux domaines techniques de l'utilisation cyclique de ressources en eau et de la protection de l'environnement. L'invention concerne un procédé d'épuration et d'utilisation cyclique d'eaux usées provenant de l'élevage d'anguilles, ainsi que l'utilisation de ces eaux. Le procédé d'épuration et d'utilisation cyclique d'eaux usées d'élevage d'anguilles comprend en particulier : la soumission des eaux usées d'élevage d'anguilles à la précipitation, à un traitement anaérobie et à un traitement de filtration et de séparation des flux, de manière à obtenir de l'eau claire et de l'eau concentrée ; la division de l'eau claire en des première et seconde parties, la soumission de la première partie à une électrolyse catalytique pour dénitrification, le mélange avec la seconde partie, et la soumission du mélange résultant à l'aération et à l'activation biologique pour obtenir un effluent recyclable ; et l'ajout d'un agent floculant et d'un coagulant à l'eau concentrée, et la soumission à un décrassage par flottation à l'air, à une microfiltration et à une électrolyse catalytique pour la dénitrification, afin d'obtenir un effluent conforme aux normes. Le procédé selon la présente invention est applicable aux eaux usées d'élevage d'anguille dans différentes conditions de pollution, permet d'obtenir des effluents de bonne qualité et conformes à la norme relative aux effluents, et permet de réaliser une utilisation cyclique et un rejet sans pollution des eaux usées d'élevage d'anguilles ; et le procédé est simple et le coût de traitement est faible, et les perspectives d'application pratique sont bonnes.
PCT/CN2024/097343 2023-06-09 2024-06-04 Procédé d'épuration et d'utilisation cyclique d'eaux usées d'élevage d'anguilles et son utilisation Ceased WO2024251121A1 (fr)

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CN202310684229.0A CN116655159A (zh) 2023-06-09 2023-06-09 一种鳗鱼养殖废水的净化循环利用方法及应用
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CN108911433A (zh) * 2018-09-05 2018-11-30 福建省致青生态环保有限公司 一种畜禽养殖废水处理工艺
CN112591951A (zh) * 2021-01-04 2021-04-02 罗依依 一种市政污水的催化电解净化系统及净化方法
CN115125231A (zh) * 2022-06-13 2022-09-30 杭州万向职业技术学院 一种养殖废水的菌藻共生处理剂及其制备方法和应用
CN116655159A (zh) * 2023-06-09 2023-08-29 皓禹(厦门)环保有限公司 一种鳗鱼养殖废水的净化循环利用方法及应用
CN220056588U (zh) * 2023-06-09 2023-11-21 皓禹(厦门)环保有限公司 一种鳗鱼养殖废水的净化循环利用系统

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