不同接种量下生物沥滤去除污泥中重金属的研究  

Effect of amount of inoculum on the bioleaching of heavy metals from sewage sludge.

作　　者：华玉妹[1] 李文红[1] 陈英旭[1] 田光明[1] 

机构地区：[1]浙江大学环境工程系,浙江杭州310029

出　　处：《浙江大学学报（农业与生命科学版）》2005年第1期47-51,共5页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：浙江省重点科研资助项目(2004C23024)

摘　　要：采用污泥的硫细菌混合菌液以2%、5%、10%和20%的接种量,序批试验研究了污泥中重金属的生物沥滤.结果表明,沥滤初期污泥pH的下降幅度和速率随混合菌液接种量增大而增大,而第4日后,4种接种量的污泥样品pH相差不大,最终稳定在1.4左右;污泥中硫细菌对硫的利用,使SO42-浓度迅速上升,同时也有少量的重金属硫化物被硫细菌利用.硫细菌接种液可明显促进污泥中Cu、Pb和Zn的沥滤,缩短沥滤周期;接种量越大,沥滤启动越快,Zn的沥滤启动快于Cu和Pb.达到最高沥滤效率后,Cu和Zn的沥滤效果均较为稳定,而Pb则有明显的持续降低趋势.选用2%硫细菌混合菌液接种量,沥滤时间控制在5～6d,Cu、Pb和Zn的沥滤效果可达到最佳,沥出率分别为96.5%、41.4%和82.9%.Four different amounts of inoculum in mixed sludge, namely 2%, 5%, 10% and 20%, were adopted to investigate the bioleaching of heavy metals from sludge by batch experiment.The result showed that the rate and degree of decrease in pH increased with the amount of inoculum at the beginning.The pH of all samples provided with inoculum approached each other from the fourth day on and were reduced down to about 1.4 at the end.The concentration of sulfate rose rapidly because of the utilization of sulfur as well as a little amount of sulfide of heavy metals by sulfur-oxidizing bacteria in sludge.The inoculum of sulfur-oxidizing bacteria raised the bioleaching rate of Cu, Pb and Zn in sludge and shortened the bioleaching process.The more the amount of inoculum, the shorter the start-up period of bioleaching was.The startup of bioleaching for Zn was faster than that of Cu and Pb.The solubilization of Cu and Zn was relatively stable after the peak, while that of Pb showed a tendency of slight fall.Using 2% inoculum, the most efficient bioleaching of Cu, Pb and Zn occurred at the 5th or 6th day, and thin bioleaching rates were 96.5%, 41.4% and 82.9%, respectively.

关 键 词：污泥 生物沥滤 硫细菌 接种量 重金属 

分 类 号：X730.1[环境科学与工程—环境工程]