改良型微曝氧化沟/微电解/絮凝技术处理金属冶炼废水

Application of Modified Micro Aeration Oxidation Ditch/Micro Electrolysis/Flocculation Technology for Metal Smelting Wastewater Treatment

金属冶炼废水难以生物降解,且存在少量还原态的金属离子,处理难度较高,针对于此,某工业园污水处理厂一期工程采用预处理/水解酸化/改良型微曝氧化沟/微电解/絮凝技术处理园区废水。当废水处理量为9 520 m^3/d,进水COD、BOD_5、SS、NH_3-N、TN、TP、总砷、总镉、总铅的平均浓度分别为460、140、187、24.3、36.2、3.4、0.04、0.007、0.06 mg/L时,对应指标的总去除率分别为91.3%、95.0%、98.8%、90.5%、87.8%、94.1%、82.5%、100%、100%,出水水质达到了《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。废水处理系统直接运行成本为1.011元/m^3。

Metal smelting wastewater was amount of reduced state metal ions. So it is hard to difficult to be biodegraded, and contained a small be treated. In the view of this situation, the combined process of pretreatment/hydrolysis acidification/modified micro aeration oxidation ditch/micro electrolysis/flocculation technology was used in the first stage project of an industrial park wastewater treatment plant. When the industrial park wastewater treatment capacity was 9 520 m^3/d, the average influent concentration of COD, BODs, SS, NH3 -N, TN, TP, total arsenic, total cadmium, total lead were 460 rag/L, 140 rag/L, 187 mg/L, 24.3 mg/L, 36.2 rag/L, 3.4 rag/L, 0.04 mg/L, 0.007 mg/L, 0.06 mg/L, respectively. And the corresponding index of total removal rate were 91.3%, 95.0%, 98.8%, 90.5%, 87.8%, 94.1%, 82.5%, 100%, 100%. The treated wastewater had reached the first grade A emission standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 -2002）. The direct operating cost of the wastewater treatment system was I. 011 yuan/m^3.