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Method for treating circulating cooling sewage of power plant

A technology for circulating cooling and sewage discharge, which is applied in the direction of biological treatment adjustment, filtration treatment, water/sewage treatment, etc. It can solve the problems of dissolved oxygen saturation, high suspended solids and salinity, unfavorable denitrification treatment, and insufficient total nitrogen in sewage. To meet the discharge standards and other issues, to achieve the effect of good effluent water quality, small footprint and high organic load

Active Publication Date: 2017-01-18
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 are not conducive to subsequent denitrification treatment
For power plant circulating cooling wastewater, there is no proper denitrification and phosphorus removal treatment technology in China.

Method used

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Comparison scheme
Effect test

Embodiment 1

[0032] Applying the method of the present invention to carry out pilot test treatment on the circulating cooling sewage of thermal power plants, the raw water dissolved oxygen is 8.5-9.0mg / L, the total nitrogen concentration is 35-60mg / L, the total phosphorus is 0.4-2.0mg / L, and the suspended matter is 9-18mg / L . The biological filtration unit adopts a columnar biological filter with a diameter of 0.6m and a height of 4m. The filter material layer is filled with pebbles, zeolite, and volcanic rock filter materials from bottom to top, and the heights are 0.4, 0.8, and 1.2m respectively; the sand filter unit adopts sand filter columns , 0.4m in diameter, 3m high, filled with pebble cushion and quartz sand filter material from bottom to top, the heights are 0.5m and 1.5m respectively.

[0033] Sodium acetate is used as an external carbon source to maintain a carbon-to-nitrogen ratio of 3.5-4:1. In total nitrogen volume load 0.45-0.76kg / m 3 Under the condition of d (influent flo...

Embodiment 2

[0035] Apply the method of the present invention to treat the circulating cooling sewage discharge project of a gas-fired thermal power plant in Beijing, the design water intake is 10000m 3 / d, influent dissolved oxygen 8.5-9.0mg / L, COD Cr20mg / L, total nitrogen concentration 40-60mg / L, total phosphorus 1.0-2.0mg / L, suspended matter 20-35mg / L. The carbon source is sodium acetate trihydrate, and the phosphorus removal agent is polyaluminum chloride. There are 6 biological filtration units in total, and the effective volume of a single pool is 136m 3 , size 5×4×6.8m, pebbles, zeolite, volcanic rock packing heights are 0.5m, 1.0m, 2.5m respectively; active sand filter pools total 12 groups, with a total effective filtration area of ​​62m 2 , Using 1.2-2.0mm quartz sand filter material. After commissioning and trial operation, the stable effluent quality of the project complies with the "Beijing Water Pollutants Comprehensive Discharge Standard" (DB11307-2013) Category A standar...

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Abstract

The invention aims to provide a method for treating circulating cooling sewage of a power plant, and belongs to the technical field of sewage treatment. The method comprises the following steps: preparing a carbon source and an oxygen removal agent; adding the carbon source and the oxygen removal agent into water to be treated and mixing fully; enabling a water sample to be treated into a biological filter unit; filtering by adopting up-flow type continuous flow; performing aerating in an upper and middle section of volcanic rock filler of the biological filter unit; preparing a flocculating agent; adding the flocculating agent into outlet water of the biological filter unit, and mixing; adding the flocculating agent and mixing again; enabling the outlet water to pass through a sand filter unit, and discharging the outlet water. According to the method, saturated dissolved oxygen in the circulating cooling sewage is effectively removed; a proper carbon nitrogen ratio is adjusted through the externally added carbon source, so that the problems of insufficient carbon source and poor biodegradability of the circulating cooling sewage are solved. The method disclosed by the invention is simple and high in efficiency, facilities automatic control, and can be combined with other circulating cooling sewage treatment processes to realize compressive treatment of the circulating cooling sewage.

Description

technical field [0001] The purpose of the present invention is to propose a method for treating circulating cooling sewage of power plants, which 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 high salinity are not conducive to subsequent denitrification treatment. For the circulating cooling sewage of power plants, there is no proper denitrification and phosphorus removal treatment technology in China. C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/5236C02F3/006C02F3/2853C02F9/00C02F2003/001C02F2209/16
Inventor 张鸿涛潘正道陈兆林黄守斌张华郝婧
Owner TSINGHUA UNIV
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