Farming wastewater phosphorous biochemical removal process

Abstract

The invention discloses a farming wastewater phosphorous biochemical removal process. The farming wastewater phosphorous biochemical removal process comprises the following processes of 1) feeding farming wastewater into an anaerobic pond for anaerobic treatment; 2) enabling the effluent of the anaerobic pond to automatically flow into an anaerobic precipitation pond for natural precipitation to obtain anoxic sludge and supernatant, returning a part of the anoxic sludge to the anaerobic pond and discharging the other part of the anoxic sludge for phosphorous removal; 3) enabling the supernatant of the anaerobic precipitation pond to automatically flow into an aerobic pond for aerobic treatment; 4) returning a part of the effluent of the aerobic pond to the anaerobic pond, enabling the other part of the effluent of the aerobic pond to automatically flow into an aerobic precipitation pond for natural precipitation to obtain aerobic sludge and supernatant, returning a part of the aerobicsludge to the aerobic pond, discharging the other part of the aerobic sludge for phosphorous removal, and performing subsequent treatment on the supernatant. The farming wastewater phosphorous biochemical removal process can make full use of the phosphorous removing effects of the sludge of an anaerobic section and the sludge of an aerobic section to achieve efficient phosphorous removal, avoid affecting the denitrification effects of nitrifying bacteria and be low in processing cost.

Description

technical field [0001] The invention relates to a biochemical dephosphorization process for aquaculture sewage, which belongs to the technical field of sewage treatment. Background technique [0002] At present, most of the aquaculture sewage is treated by anaerobic, anoxic and aerobic combined biochemical processes, but due to the widespread use of phosphorus-rich feed and the low absorption and utilization of phosphorus by livestock and poultry, most of the phosphorus will be discharged with manure. To the outside of the organism, the phosphorus content in the aquaculture sewage is seriously exceeded, which in turn leads to a serious imbalance in the ratio of C, N, and P in the aquaculture sewage, which greatly increases the difficulty of phosphorus removal, and the phosphorus removal effect of the aquaculture sewage is often not ideal. [0003] The principle of biochemical phosphorus removal is as follows: in the anaerobic section, phosphorus-releasing bacteria release ph...

AI Technical Summary

Problems solved by technology

Studies have found that by shortening the sludge age of aerobic sludge and increasing the amount of sludge discharged, the biochemical phosphorus removal capacity can be improved, but this will have a great impact on the nitrification of nitrifying bacteria

The traditional phosphorus removal process mainly relies on the phosphorus removal effect of the sludge in the anaerobic stage and the sludge in the aerobic stage, while ignoring the phosphorus removal effect of the sludge in the anoxic stage

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