A^2O-Fenton工艺处理焦化废水回用工程实例

Project example of reuse of coking wastewater treated by A^2O-Fenton process

针对焦化废水毒性大、酚氰指数高、氨氮高、水质波动大、可生化性差的特点,采用A2O-Fenton工艺进行处理。工程运行结果表明,CODCr的质量浓度从3 500~5 000 mg/L下降到150 mg/L以下,氨氮质量浓度从200~350 mg/L下降到5 mg/L以下,去除率分别达到了95%和97%,出水水质稳定达到GB 16171—2012《炼焦化学工业污染物排放标准》的要求,可回用于炼铁冲渣。

As coking wastewater has characteristics of high toxicity, high phenol cyanide index, high ammo-nia nitrogen concentration, large fluctuation of water quality, poor biodegradability and so on, A^2O-Fenton pro-cess was used for its treatment. The results of engineering operation showed that, the mass concentration of CODCr decreased from 3 500 - 5 000 mg/L to below 150 mg/L, the mass concentration of ammonia nitrogen decreased from 200 - 350 mg/L to below 5 mg/L, the removal rates reached 95% and 97% respectively, the effluent water quality was stable and met the specification of GB 16171-2012 Emission Standard of Pollutants for Coking Chemical Industry, which could be reused for iron smelting slag washing.