可渗透反应墙处理铅锌硫化矿选矿废水的实验研究

The Experimental Research of Permeable Reactive Barrier to Dispose the Beneficiation Wastewater from Pb-Zn Sulfide Ore

以铅锌硫化矿选矿废水为研究对象,分别用改性红辉沸石、活性炭、铁粉、石英砂等为反应介质,设计4中不同介质配比的可渗透反应墙反应器,进行实验研究。结果表明,各PRB反应器对其均有较好的去除效果,其中对化学需氧量、氨氮、总砷、总镉、总铅、总锌、总铜的最大去除率分别为86.54%、90.00%、94.44%、96.25%、94.34%、96.19%、95.67%。当材料配比为:还原铁粉∶活性炭∶石英砂=35∶25∶40及还原铁粉∶改性红辉沸石∶石英砂=55∶25∶20时,铅锌硫化矿选矿废水出水中各污染物均能达到《铅、锌工业污染物排放标准》(GB25466-2010)浓度限值要求。实验结果表明,改性红辉沸石、活性炭的添加有助于去除选矿废水中污染因子。

Four reaction media of zero valent iron,activated carbon,modified stellerite and quartz sand were used to design four kinds of permeable reactive barriers（ PRB） to study the feasibility and the efficiency of the PRB technology in the remediation of beneficiation wastewater from Pb- Zn sulfide ore. The result indicated PRB had great removal of beneficiation wastewater from Pb- Zn sulfide ore. The maximum removal rates of CODCr,ammonia nitrogen,total arsenic,total cadmium,total lead,total zinc and total copper were 86. 54%,90. 00%,94. 44%,96. 25%,94. 34%,96. 19%,95. 67%,respectively. The effluent quality can comply with emission standard of pollutants for lead and zinc industry（ GB 25466- 2010） when material ratio was zero valent iron∶activated carbon∶quartz sand was 35∶25∶40 or zero valent iron∶modified stellerite： quartz sand was 55∶25∶20. Modified stellerite and activated carbon contributed to removal of pollution factors.