Method for efficiently removing nitrogen and carbon from anaerobic effluent of swine wastewater

Abstract

The invention discloses a method for efficiently removing nitrogen and carbon from anaerobic effluent of swine wastewater. The method comprises the following steps: firstly, removing suspended solids contained in incoming water in a coagulating sedimentation system by utilizing polyacrylamide and polyaluminum chloride; through the anaerobic hydrolysis tank, intensifying and converting organic matters in the incoming water into organic acid again to serve as an effective carbon source for subsequent heterotrophic denitrification, and meanwhile, reducing COD to ensure a proper C / N ratio of subsequent nitrosation, anaerobic ammonia oxidation and denitrification reaction; removing most ammonia nitrogen, total nitrogen and COD (Chemical Oxygen Demand) in the incoming water by utilizing an SNAD system, and limiting the aeration rate of the reactor to ensure that a certain concentration of free ammonia exists in a reactor to maintain the inhibition effect on nitrite oxidizing bacteria, so that more ammonia nitrogen is converted into nitrite and finally converted into nitrogen; and finally, maintaining an anaerobic environment in the short-range sulfur autotrophic denitrification-anaerobic ammonia oxidation reactor to ensure that ammonia nitrogen is not oxidized, and controlling the addition amount of sulfur to achieve the purposes of reducing the addition amount of sulfur and saving medicament consumption.

Description

technical field [0001] The invention relates to the technical field of livestock and poultry breeding wastewater treatment, in particular to a method for efficient denitrification and carbon removal of pig raising wastewater through anaerobic effluent. Background technique [0002] The scale of my country's pig farming industry is increasing day by day, and the discharge of pig farming wastewater is increasing. The statistics of the Second National Survey of Pollution Sources (June 8, 2020) pointed out that in 2017, the discharge of water pollutants from large-scale livestock and poultry farms nationwide included 6.0483 million tons of chemical oxygen demand (COD) and 75,000 tons of ammonia nitrogen. The total nitrogen is 370,000 tons. Pig farming wastewater is mainly composed of animal feces, urine, feed residues, and house flushing water. It mainly contains pollutants such as ammonia nitrogen and COD, which can lead to environmental problems such as eutrophication of wate...

AI Technical Summary

Problems solved by technology

[0003]The current pig wastewater treatment plant is generally far away from the urban area, and it is difficult to connect the effluent to the municipal sewage pipeline, which requires that the treated sewage should have a higher water quality; while the traditional The nitrification and denitrification process has the problems of long residence time and high operating costs

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