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

A technology of denitrification and phosphorus removal and circulating cooling, applied in the field of denitrification and phosphorus removal systems, can solve the problem of total nitrogen, total phosphorus and organic matter in sewage that cannot meet the discharge standards, lack of proper denitrification and phosphorus treatment technology, dissolved oxygen saturation, suspended solids and high salinity, to achieve the effect of good effluent quality, small footprint and high organic load

CN106219904APending Publication Date: 2016-12-14TSINGHUA UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-12-14

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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.
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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...

Examples

Embodiment 1

[0029] use figure 1 In the pilot plant shown, the composite biological filter has a diameter of 0.6m, a height of 4m, and an effective volume of 565L. The filter material is a combination of volcanic rock and zeolite. A gas-fired thermal power plant circulating cooling sewage, dissolved oxygen 8.5-9.0mg / L, total nitrogen concentration 35-60mg / L, sodium acetate as an additional carbon source, carbon-nitrogen ratio 3.5:1, total phosphorus 0.4-2.0mg / L, Suspension 9-18mg / L.

[0030] The total nitrogen load in the volume is 0.45-0.76kg / m 3 Under the condition of d (influent flow rate 300L / h), after 30 days of operation, the total nitrogen effluent concentration is lower than 10mg / L, the total nitrogen removal rate is between 71.4% and 83.3%; the suspended matter is reduced to 5mg / L The excess carbon source can be removed by aeration in the upper stage of the composite biological filter, and the chemical oxygen demand of the effluent is lower than 20mg / L; the effluent of the compo...