A method for denitrification and hydrogen sulfide removal with sulfide-type deamox post-anoxic filter based on aao-baf process effluent

Abstract

A device and method for denitrification and hydrogen sulfide removal by a sulfide-type DEAMOX post-installed anoxic filter based on the effluent of the AAO‑BAF process belong to the field of wastewater biological treatment. Control the average hydraulic retention time in the anoxic zone of the AAO reactor at 3 to 8 hours, and simultaneously remove nitrogen and phosphorus through the biochemical action of denitrification and phosphorus removal; the filler in the BAF is inoculated with nitrifying bacteria to convert ammonia nitrogen NH 4 + ‑N is oxidized to nitrate NO 3 ‑ ‑N; post anoxic filter, and at the same time cover and collect hydrogen sulfide gas from the anoxic section to the anaerobic section of the AAO reactor, then pass the collected gas through the hydrogen sulfide absorption tower to absorb hydrogen sulfide to produce hydrogen sulfuric acid, and then contain Hydrogen sulfuric acid water, ammonia nitrogen in the effluent of the AAO reactor and nitrate nitrogen in the effluent of the BAF are passed into the post-anoxic filter, and finally the nitrogen in the water is removed in the form of nitrogen, so as to overcome the effluent of the AAO+BAF process. The disadvantage of nitrate nitrogen, while further removing the total nitrogen of municipal sewage, it can also remove the hydrogen sulfide produced in the water treatment process and protect the air.

Description

technical field [0001] The invention relates to a method for deep nitrogen and phosphorus removal while removing hydrogen sulfide, belongs to the field of wastewater biological treatment, and is applicable to the technical fields of sewage treatment such as municipal sewage treatment with low C / N ratio, advanced treatment, standard upgrading and transformation. Background technique [0002] With the continuous advancement of the urbanization process and the improvement of people's living standards, the discharge of urban sewage has increased significantly. Since the discharge of nitrogen and phosphorus in sewage will cause eutrophication of water bodies, the problem of nitrogen and phosphorus removal from urban domestic sewage has gradually been raised. Pay attention to. At present, the total nitrogen TN of the effluent of many water plants is difficult to meet the first-level A discharge standard (effluent TN≤15mg / L) of the Discharge Standard of Pollutants for Urban Sewage ...

AI Technical Summary

Problems solved by technology

The AAO-BAF process is designed to solve two major problems in sewage treatment plants: the contradiction between nitrifying bacteria sludge age and heterotrophic bacteria sludge age, and how to simultaneously remove nitrogen and phosphorus under the condition of low C / N ratio. There is still the problem of high nitrate nitrogen in the effluent

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