硫化物沉淀法处理含铅废水  

Treatment of wastewater containing lead by sodium sulfide precipitation

作　　者：何绪文[1] 胡建龙[1] 李静文[1] 张晶晶[1] 王建兵[1] 葛鹏[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《环境工程学报》2013年第4期1394-1398,共5页Chinese Journal of Environmental Engineering

基　　金：环保公益性行业科研专项(201009037);中央高校基本科研业务费(2009KH01)

摘　　要：采用硫化物沉淀化处理含铅废水,考察了Na2S投加量、反应初始pH等操作条件对铅离子去除效果的影响,以及硫化铅沉淀反应过程的动力学特征,并采用激光粒度分析仪对反应生成的硫化铅沉淀的粒径分布进行了测定。实验结果表明,S2-与废水中Pb2+之间的沉淀反应能较好地符合一级反应动力学特征;Na2S与Pb2+的最佳物质的量之比为3;最佳的反应初始pH为6～9。在最佳操作条件下,Pb2+的平均去除率为99.60%,反应出水中Pb2+平均浓度为0.13 mg/L,低于污水综合排放标准(GB8978-1996)中铅的排放浓度限值。反应生成的硫化铅沉淀的平均粒径为2.62μm,具有较好的沉淀性能,能够通过沉淀的方式与废水分离。The wastewater containing lead ion was treated with sodium sulfide precipitation process. Precipitation reaction kinetics of PbS and operation variables, such as Na2S dosage, initial pH of wastewater, were investigated. The particle size distribution was studied using laser particle size analyzer as well. The results showed that the precipitation reaction fitted well with first order reaction model. The optimal Na2S dosage （ molar ratio of Na2S/Pb2＋ ） and initial pH of wastewater were 3 and 6 - 9, respectively. Under the optimal operation condi- tions, the Pb2＋ removal efficiency of 99.60% was obtained, and the residual Pb2＋ concentration was 0.13 mg/ L after treatment, it was below the lead discharge limit of Wastewater Integrated Discharge Standard of China （GB8978-1996）. The mean particle size of PbS formed in the precipitation reaction was 2.62 ~m, which indicates that the PbS precipitation can be well separated from wastewater by sedimentation treatment.

关 键 词：铅 重金属 废水处理 硫化钠 沉淀 

分 类 号：X522[环境科学与工程—环境工程]