Comprehensive treatment method for wastewater of livestock and poultry cultivation

Abstract

Disclosed is a comprehensive treatment method of livestock and poultry breeding wastewater, which adopts the following three steps that: firstly, an upflow anaerobic sludge blanket treater (3) is used for anaerobic biological treatment and killing bacteria and viruses. Secondly, an improved moving bed biomembrane treater (6) is used for aerobic biological treatment, a longitudinal clapboard (12) is added into the treater (6) to partition the treater into an aerobic zone (13) and a solid-liquid separation zone (10), an air pump (7) is used for increasing oxygen while guiding the sewage, and a simultaneous nitrification and denitrification method is used to remove total nitrogen (TN) and decompose organics under the action of microorganisms. Thirdly, a chemical reaction method is adopted to remove P and N in the sewage, after the former two steps of treatment, mass P and N with a certain amount still exist in the sewage, liquid magnesium oxide is again added for generating magnesium ammonium phosphate precipitates, and the supernatant is discharged when reaching the standards. The method has advantages of speediness, land saving, energy saving, complete material transfer, small influence under external conditions and good purification effects when treating wastewater.

Description

technical field [0001] The invention relates to a waste water treatment method, which is a treatment method for organic waste water rich in nitrogen and phosphorus. Background technique [0002] The chemical oxygen demand (COD) concentration of livestock and poultry wastewater is as high as 10000mg / L, ammonia nitrogen (NH 3 -N) concentration of 500-1300mg / L, total phosphorus (TP) concentration of 50-100mg / L, is a kind of organic wastewater rich in N and P, and a serious pollution source in urban and rural areas. Livestock and poultry wastewater currently adopts anaerobic digestion technology, mainly including ordinary anaerobic digestion tank, upflow anaerobic sludge bed (UASB), anaerobic filter (AF), but after anaerobic digestion, the concentration of pollutants in the effluent , especially the concentration of N and P is still high, can not reach the discharge standard, and further treatment is needed, mainly including artificial wetland, oxidation pond ecological treatme...

AI Technical Summary

Problems solved by technology

However, magnesium salts, phosphates, and pH value regulators are often added in the reaction, resulting in the disadvantages of high salt concentration in the effluent and increased treatment costs.

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