火电厂开式冷却循环排污水达标处理研究

Study on Standard Treatment of Open Cooling Circulating Sewage in Thermal Power Plant

某燃气-蒸汽联合循环热电联产发电厂,采用机力通风塔系统冷却,冷却水源为城市污水处理厂中水。循环水排污水处理后作为景观补充水,要求TP小于0.2 mg/L,TN小于10 mg/L。文章针对循环水排污水水质的高温、高盐、高氮低碳、含余氯和阻垢缓蚀剂等特性,通过中试考察研究了复合生物滤池的处理效果,并根据中试试验结果建成一套循环排污水处理设施,建成后实际运行效果表明水TP、TN满足排放要求。该研究对于电力企业节约水资源、减少污染物排放具有重要的作用。

A gas-steam combined cycle cogeneration power plant uses mechanical ventilation cooling tower system, the cooling water using the urban sewage treatment plant discharging water. After circulating water sewage treatment, the water is used as landscape water supplement with requirements of TP less than 0.2 mg/L,TN less than 10 mg/L. Based on circulating water sewage water of high temperature, high salt, high nitrogen and low carbon, residual chlo- rine and scale inhibitor features, the treatment effect of compound biological filter was studied, and according to the results of the pilot test, a set of circulating sewage treatment facilities was built,the running effect shows that TP and TN meet emission requirements. The research plays an important role for the electric power enterprise in saving water and reducing pollutant emission.