Method for treating high ammonia-nitrogen wastewater through multipoint dispersed water injection three-stage compound A/O (Anoxic/Oxic) process

Abstract

The invention discloses a method for treating high ammonia-nitrogen wastewater through a multipoint dispersed water injection three-stage compound A / O (Anoxic / Oxic) process and belongs to the field of environment friendliness. The method comprises the following steps: pretreating the high ammonia-nitrogen wastewater, and enabling the wastewater to enter a regulating reservoir; enabling the effluent to enter a biological treatment system, wherein the biological treatment system comprises an A / O reactor in three-stage series operation; respectively injecting water into a primary A / O reactor, a secondary A / O reactor and a three-stage A / O reactor in a dispersed manner according to a ratio, wherein the reactor is jointly built by an anoxic area and an oxic area with the same volume; the inlet water is in a multipoint dispersed injection manner; the inlet water in the primary A / O reactor, the secondary A / O reactor and the three-stage A / O reactor is respectively 30-40%, 20-30% and 10-20% of the total water amount of the inlet water; and the water inlet position is the anoxic area of the three-stage A / O reactor; and enabling the treated wastewater to freely flow out from the top of a secondary sedimentation tank, periodically discharging the sludge, and enabling the sludge to enter the primary A / O reactor through a sludge return pump. The method disclosed by the invention has excellent popularization prospects on treatment of coking plant wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and is used for industrial sewage treatment, in particular to a biological treatment process for high-concentration ammonia nitrogen wastewater. Background technique [0002] With the continuous improvement of urbanization and industrialization, the water environment has seriously affected the sustainable development of the national economy and society, and seriously threatened the survival of human beings. The problem of water pollution is one of the major environmental issues of global priority. Especially in recent decades, excessive nitrogen pollutants produced by human life and production have been discharged into water bodies, resulting in water hypoxia, stench and eutrophication. Removing nitrogen from water has become a key issue in water pollution prevention and control. [0003] The use of microorganisms is one of the most widely used technologies for ammonia nitrogen w...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a biological treatment process for high-concentration ammonia-nitrogen wastewater to solve the problem of high concentrations of ammonia nitrogen and organic matter in wastewater, and at the same time solve the problem that wastewater effluent ammonia nitrogen and total nitrogen are difficult to reach the standard

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