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High-efficiency and low-consumption standard-reaching treatment method for wastewater from scale piggery raising

A technology for aquaculture wastewater and treatment methods, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of large technical investment, poor operability, and high operating costs, and achieve High removal rate, high utilization rate, and the effect of reducing operating costs

Inactive Publication Date: 2012-08-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional anaerobic biogas fermentation and anaerobic-aerobic treatment processes for livestock and poultry wastewater, such as point source engineering pollution reduction and control technologies, require large investment, poor stability, high operating costs, and poor operability

Method used

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  • High-efficiency and low-consumption standard-reaching treatment method for wastewater from scale piggery raising
  • High-efficiency and low-consumption standard-reaching treatment method for wastewater from scale piggery raising

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After the aquaculture wastewater is separated from the solid by the hydraulic sieve, 60% of the wastewater enters the upflow anaerobic sludge bed reactor to convert most of the COD and recover biogas. The aerobic section of the sequencing batch reactor is used for treatment, the DO is controlled at 2mg / L, and the reaction time is 5h. After the aerobic treatment is completed, 40% of the wastewater enters the anoxic section of the sequential batch reactor for denitrification and denitrification. At the same time, the alkalinity is replenished, the reaction time is 8 hours, and then it enters the precipitation section of the step-by-step water-inflow batch reactor, and the precipitation is 0.5 hours. Magnesium chloride, so that the molar ratio of Mg to P is 1.5, aeration and stirring to recover nitrogen and phosphorus nutrients, the reaction time is 1.5h, the active ingredient of the recovered product is magnesium ammonium phosphate, which is used as a slow-release fertiliz...

Embodiment 2

[0019] After the breeding wastewater is separated from solid and liquid by hydraulic sieving, 90% of the wastewater enters the upflow anaerobic sludge bed reactor to convert most of the COD and recover biogas, and the effluent of the upflow anaerobic sludge bed reactor enters the sub-step inflow The aerobic section of the sequencing batch reactor is used for treatment, the DO is controlled at 5 mg / L, and the reaction time is 7 hours. After the aerobic treatment is completed, 10% of the wastewater enters the anoxic section of the sequential batch reactor for denitrification and denitrification. At the same time, the alkalinity is replenished, the reaction time is 6 hours, and then it enters the precipitation section of the step-by-step batch reactor for precipitation, and the supernatant enters the magnesium ammonium phosphate crystallization reactor. Magnesium chloride, so that the molar ratio of Mg to P is 1.9, aeration and stirring to recover nitrogen and phosphorus nutrients...

Embodiment 3

[0021] After the breeding wastewater is separated from solid and liquid by hydraulic sieving, 70% of the wastewater enters the upflow anaerobic sludge bed reactor to convert most of the COD and recover biogas. The aerobic section of the sequencing batch reactor is used for treatment, the DO is controlled at 4 mg / L, and the reaction time is 6 hours. After the aerobic treatment is completed, 30% of the wastewater enters the anoxic section of the sequential batch reactor for denitrification and denitrification. At the same time, the alkalinity is replenished, the reaction time is 7 hours, and then it enters the precipitation section of the step-by-step batch reactor for precipitation, and the supernatant enters the magnesium ammonium phosphate crystallization reactor. Magnesium chloride, so that the molar ratio of Mg to P is 1.9, aeration and stirring to recover nitrogen and phosphorus nutrients, the reaction time is 1.5h, the active ingredient of the recovered product is magnesiu...

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Abstract

The invention discloses a high-efficiency and low-consumption standard-reaching treatment method for wastewater from scale piggery raising. According to the high-efficiency and low-consumption standard-reaching treatment method, after the wastewater from raising is subjected to solid-liquid separation through a hydraulic screen, 60-90 percent of wastewater enters an up-flow type anaerobic sludge blanket reactor; mostly COD (Chemical Oxygen Demand) is converted and methane is recovered; effluent enters an aerobic zone of a step-fed sequencing batch reactor for treatment; after the aerobic treatment is finished, the effluent and 10-40 percent wastewater enter an anoxic zone for denitrification; meanwhile, the basicity is replenished and the mixer enters a precipitation zone; supernate enters a magnesium ammonium phosphate crystallization reactor for recovering nitrogen and phosphorus; pig manure is added into residual sludge generated by the up-flow type anaerobic sludge blanket reactor and the step-fed sequencing batch reactor for treatment and then the mixture is fermented in a high-concentration anaerobic digester to generate methane; biogas slurry and biogas residue which are used as high-quality organic fertilizer are fertilized to the farmland; the generated methane is used for generating power; and electric energy is supplied to wastewater treatment equipment for operating. The high-efficiency and low-consumption standard-reaching treatment method disclosed by the invention has the advantages of simple process, convenience in resource recycling, long-term stable and reliable treatment effect and proper construction, operation and maintenance expenses.

Description

technical field [0001] The invention relates to a high-efficiency, low-consumption and up-to-standard treatment method for large-scale pig farm breeding wastewater, which belongs to the technical field of environmental protection wastewater treatment. Background technique [0002] Livestock and poultry breeding pollution is a major environmental problem in my country, and it is also a major problem in the construction of a new socialist countryside and the sustainable development of agriculture in our country. The non-point source pollution of my country's livestock and poultry breeding industry contributes as much as 30% to nitrogen and phosphorus in water bodies, making it one of the most serious pollution sources in my country's water environment and rural environment. Solving the problem of livestock and poultry breeding pollution is an important task for my country's environmental protection and sustainable agricultural development. Research and development of key tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/04C01B25/45
CPCY02E50/343Y02E50/30
Inventor 吴伟祥王亮陈重军李波韩志英
Owner ZHEJIANG UNIV
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