Treatment technology of livestock and poultry breeding wastewater

Abstract

The invention discloses a treatment technology of livestock and poultry breeding wastewater. The technology comprises steps as follows: sewage is pretreated and then sequentially passes through a primary sedimentation tank, a biological tank and a secondary sedimentation tank for treatment, wherein the biological tank comprises an aerobic zone and an anoxic zone; effluent of the primary sedimentation tank passes through a distribution well and flows into the aerobic zone and the anoxic zone simultaneously, effluent of the aerobic zone enters the anoxic zone for treatment, part of effluent of the anoxic zone flows back to the aerobic zone, the rest of effluent enters the secondary sedimentation tank for precipitation separation, and effluent is discharged from a discharge port; bentonite and grapestone tannin are added to the aerobic zone, and a weight ratio of bentonite to grapestone tannin is (1-3):(0.5-1.8). With the adoption of the technology, ammonia nitrogen in sewage can be rapidly and effectively removed.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a treatment process 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 poultry breeding wa...

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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