Nitrogen and phosphorus removal system for treating circulating cooling discharge water of power plant

Abstract

The invention relates to a nitrogen and phosphorus removal system for treating circulating cooling discharge water of a power plant, and belongs to the technical field of sewage treatment. According to the system, a carbon source and a deoxidant are added into circulating cooling discharge water with high-nitrogen, low carbon and high-dissolved-oxygen to keep an appropriate carbon nitrogen ratio and water intake dissolved-oxygen concentration; the sewage flows through a composite biofilter, denitrifying bacteria grow as a biofilm in the composite biofilter filling, nitrogen in a polluted water sample is removed by utilizing the denitrification effect, and the upper part of a biological filling region is aerated to carbonize residual organic matters; partial ammonia nitrogen and suspended solids in the sewage are synchronously entrapped by means of adsorption and filtration of multi-stage filter materials; a phosphorus removing agent is added into effluent of the composite biofilter, flocculated phosphorus enters an active sand filter, phosphorus is removed by filtering, and suspended solids can be further removed. The nitrogen and phosphorus removal system is applicable to a circulating cooling discharge water treatment engineering of a power plant and nitrogen and phosphorus removal deep treatment of other wastewater with similar qualities.

Description

technical field [0001] The invention relates to a nitrogen and phosphorus removal system for treating circulating cooling sewage of power plants, and belongs to the technical field of sewage treatment. Background technique [0002] The circulating cooling water of power plants in my country mainly uses the effluent (regenerated water) of urban sewage treatment plants as supplementary water. The nitrogen, phosphorus, organic matter and other indicators contained in the regenerated water itself comply with the first-level A discharge standard, but after being concentrated by the circulating cooling system, the total nitrogen in the sewage , total phosphorus, organic matter, etc. cannot meet the discharge standards, and dissolved oxygen saturation, suspended solids, and salt content are high. For power plant circulating cooling sewage, there is no proper denitrification and phosphorus removal treatment technology in China. [0003] Combined Biological Filter (CBF for short) is a...

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Problems solved by technology

[0002] The circulating cooling water of power plants in my country mainly uses the effluent (regenerated water) of urban sewage treatment plants as supplementary water. The nitrogen, phosphorus, organic matter and other indicators contained in the regenerated water itself comply with the first-level A discharge standard, but after being concentrated by the circulating cooling system, the total nitrogen in the sewage , total phosphorus, organic matter, etc. cannot meet the discharge standards, and dissolved oxygen saturation, suspended solids, and high salinity, for power plant circulating cooling sewage, there is no proper denitrification and phosphorus removal treatment technology in China.

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