Denitrification treatment method for livestock and poultry breeding wastewater

Abstract

The invention discloses a denitrification treatment method for livestock and poultry breeding wastewater. Sewage is pretreated and then is sequentially treated by a primary sedimentation tank, a biological tank and a secondary sedimentation tank; the biological tank comprises an aerobic phase and an anoxic phase; effluent of the primary sedimentation tank simultaneously flows into the aerobic phase and the anoxic phase by a distribution well; effluent of the aerobic phase enters the anoxic phase for treating; one part of effluent of the anoxic phase refluxes to the aerobic phase; the residual effluent enters the secondary sedimentation tank for settling and separating; the effluent is discharged through a discharging outlet; diatomite and grape seeds tannin are fed in the aerobic phase in a weight ratio of (1 to 3) to (0.5 to 1.8). According to the process, ammonia nitrogen in the sewage can be effectively removed rapidly.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a denitrification treatment method for livestock and poultry breeding wastewater. Background technique [0002] Nitrogen is a very important pollution factor in the water environment. With the development of petrochemical, food and pharmaceutical industries and the improvement of people's living standards, the nitrogen content in urban sewage, industrial sewage and garbage permeate has risen sharply. Nitrogen in sewage The main forms of nitrogen are molecular nitrogen, organic nitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen, and in the untreated raw wastewater, organic nitrogen and ammonia nitrogen are the main forms of nitrogen; Ammonia nitrogen and nitrate nitrogen are the main forms of nitrogen in the effluent after secondary biochemical treatment. According to reports, urban domestic sewage, industrial wastewater, and livestock and poul...

AI Technical Summary

Problems solved by technology

Not only that, the traditional biological denitrification process, such as A / O method, A 2 Aeration in the nitrification stage such as the / O method usually consumes a lot of energy. In order to neutralize the acidity generated during the nitrification process, alkali needs to be added to neutralize it, which increases the treatment cost.

Compared with domestic sewage, livestock and poultry breeding wastewater has higher organic content, CODcr as high as 4000-8000mg / L, BOD5 as high as 1500-6000mg / L, and ammonia nitrogen concentration as high as 800-1500mg / L, which is more difficult to treat

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