河南农业科学Issue(11)：65-71,7.
焦作市城市污泥中重金属的形态分布及生态风险评价
Speciation Distribution of Heavy Metals in Sewage Sludge of Jiaozuo and Ecological Risk Assessment
摘要
Abstract
In order to understand the speciation of heavy metal elements in sewage sludge and their ecological risk to agricultural usage,grit chamber sludge and de-watering sludge of Jiaozuo sewage treatment plant were sampled.The speciation analysis of Cr,Pb,As,Cu,Zn and Ni were performed using a modified BCR extraction procedure.Index of geoaccumulation and potential ecological risk index were calculated to assess the potential ecological risk induced by heavy metal elements in the sewage sludge. The results showed that the concentrations of the six heavy metal elements in grit chamber sludge and de-watering sludge of Jiaozuo sewage treatment plant met the requirements of state standards set for sewage sludge of agricultural use.Compared with the grit chamber sludge,the total content of heavy metal elements and the percentage of exchangeable fraction of six heavy metal elements in de-watering sludge were higher;except Cr,percentages of residual fraction of the other heavy metal elements were lower.Among six heavy metal elements,Pb in the sludge showed the highest chemical stability and the lowest bioavailability with the highest percentage of residual fraction(85.69% in grit chamber sludge and 82.25% in de-watering sludge),the lowest percentage of exchangeable fraction(0.29% in grit chamber sludge and 1.2 5% in de-watering sludge );Ni showed the highest highest transport capability and bioavailability with the highest percentage of exchangeable fraction(4.00% in grit chamber sludge and 15.53% in de-watering sludge)and the lowest percentage of residual fraction(24.34% in grit chamber sludge and 1 9.5 6% in de-watering sludge).The index of geoaccumulation indicated that Cr,Pb,As,Cu, Ni belonged to clear level,while Zn belonged to moderate pollution level.The potential ecological risk index indicated that the six heavy metal elements in sludge of Jiaozuo sewage treatment plant had low potential ecological risk,and might be applied to farm land after suitable treatments.关键词
城市污泥/重金属/形态分析/地累积指数/生态风险/焦作市Key words
sewage sludge/heavy metal/fraction analysis/index of geoaccumulation/ecological risk/Jiaozuo分类
资源环境引用本文复制引用
崔莹,王海邻,李永,王梅,李自强..焦作市城市污泥中重金属的形态分布及生态风险评价[J].河南农业科学,2014,(11):65-71,7.基金项目
国家自然科学基金项目 （）
