电镀工业园区废水处理工艺改造

Process Reconstruction and Optimization Design of Electroplating Wastewater Containing Complex Heavy Metals

针对湖北省某电镀园区污水处理厂出水水质不稳定的问题,在铜镍络合废水物化处理段增加铁碳微电解池和芬顿氧化池;将A/O工艺改为A/O-MBR工艺;增加多介质过滤+反渗透+超滤组合工艺作为深度回用处理系统。经过一年的实际运行,其出水总铬、六价铬、总镍、总铜、总锌、SS、COD、TN、NH3-N、TP均达到《电镀污染物排放标准》(GB 21900-2008)表3规定限值和《湖北省汉江中下游流域污水综合排放标准》(DB 42/1318-2017)二者中的最严值,极大改善了周围的水环境,对同类型电镀园区污水处理厂的改造具有一定的借鉴意义。

In view of the unstable effluent quality of an electroplating treatment plant of Hubei Province,the original process was modified. The iron-carbon micro-electrolysis and Fenton oxidation was added to the physical and chemical treatment section of copper-nickel complex wastewater. The original A/O process was changed to A/O-MBR process. A combined technology including multi-media filtration,reverse osmosis,and ultrafiltration was added as advanced reuse treatment process. After one year of actual operation,its effluent total chromium,hexavalent chromium,total nickel,total copper,total zinc,SS,COD,NH3-N,TP all reached the limits in table 3 of Emission Standard of Pollutants for Electroplating (GB 21900-2008) and the most stringent limits in the Comprehensive Wastewater Discharge Standard for the Middle and Lower Reaches of the Han River in Hubei Province (DB 42/1318-2017),and consequently the surrounding water environment was improved. It could provide reference for process modification of similar electroplating wastewater projects.