混凝-响应面法优化Fenton工艺深度处理焦化废水

Study on Advanced Treatment of Coking Wastewater by Fenton Process Improved With Coagulation-Response Surface Method

焦化废水经生化处理后,有机物难以继续降低,为满足出水要求,需进行深度处理以降低水中有机物,实验采取混凝-Fenton联合法处理该焦化废水。结果表明:在进水COD为250~400 mg/L时,混凝的最佳条件为混凝剂PFS的投加量800 mg/L、pH为8、CPAM投加量为0 mg/L、搅拌时间15 min;Fenton最佳条件为Fe^(2+)投加量302.38 mg/L;n(Fe^(2+))∶n(H_(2)O_(2))为1.00∶6.84;初始pH为3.84;反应时间125.84 min,经混凝-Fenton氧化深度处理,有机物浓度由原来的250~400 mg/L降至60 mg/L以下,出水达到GB 16171—2012《炼焦化学工业水污染排放标准》排放标准。

After biochemical treatment of coking wastewater,the organic matter is difficult to reduce further.In order to meet the emission requirements,the effluent shall be subjected to an advanced treatment to reduce its organic matter.This paper treats the coking wastewater by the combined coagulation-Fenton method.The results show that:When the influent COD is 250~400 mg/L,the optimal coagulation conditions are as follows:coagulant PFS dosage:800 mg/L;pH:8;CPAM dosage:0 mg/L;and stirring time:15 min.The optimal conditions of Fenton are as below:Fe^(2+)dosage:302.38 mg/l;n(Fe^(2+))∶n(H_(2)O_(2)):1.00∶6.84;initial pH:3.84;reaction time:125.84 min.After the advanced treatment by coagulation-Fenton oxidation,the organic matter concentration decreases from 250~400 mg/L to 60 mg/L or below,and the effluent meets the Emission Standard of Pollutants for Coking Chemical Industry(GB 16171—2012).