氧化硫硫杆菌浸出污泥中重金属的分析与评价

Analysis and Assessment of Bioleaching of Heavy Metals from Sewage Sludge by Thiobacillus thiooxidan

通过设计淋滤实验,分析了不同淋滤条件下污泥中重金属的去除率,并应用Hakanson潜在生态危害指数法(Potential Ecological Risk Index,简记PERI)对其进行评价.研究发现,Cu、Pb、Zn、Cr和Ni的浸出取决于硫粉和硫酸浓度,经过14 d的淋滤实验,加硫粉处理后Cu、Pb、Zn、Cr和Ni的去除率可分别达到96.8%,53.2%,94.2%,97.5%,103.0%.结果表明:生物淋滤后污泥中重金属潜在生态风险属于低度风险,Cu在污泥中表现出较高的潜在生态风险,在污泥处置利用时应多加关注.

By designing of the bioleaching experiment,the removal rate of heavy metals from sludge was discussed under various conditions,and they were evaluated by the potential ecological risk index（PERI） of Hakanson method.The study shows that the bioleaching of Cu,Pb,Zn,Cr and Ni obviously depends on the concentration of sulphur powder and sulphuric acid.After 14 days of bioleaching,the removal rate of Cu,Pb,Zn,Cr and Ni adding sulfur in sewage sludge were 96.8%,53.2%,94.2%,97.5% and 103.0%,respectively.The results display that the heavy metals of sludge after bioleaching had slight PER,and the Cu ions implied high ecological risk in sludge,which should be paid more attention to the treatment of municipal sludge.