摘要
调查研究了广西区内主要城市污水厂脱水污泥养分、有机质含量和As、Cd、Cr、Cu、Ni、Pb、Zn等7种重金属总量与形态分布,并对其土地利用的潜在风险进行了评价。广西城市污泥的总养分和有机质平均含量分别为87.11 g/kg和34.63%,具有较高的农用价值。Zn和Cd平均含量超过国家污泥农用标准,分别为1 095.75,16.22 mg/kg,其余污泥平均值不超标。污泥中7种重金属的化学形态均以稳定态为主,但As的可交换态比例相对偏高,而其他6种重金属的铁锰氧化物结合态比例相对偏高而比较稳定。风险指数分析表明,Cd为广西区内城市污泥中重金属潜在生态风险的主要贡献者,在污泥处理处置时应引起关注。
The contents of nutrients, organic matter and As, Cd, Cr, Cu, Ni, Pb, Zn of sewage sludge from main municipal wastewater treatment plants in Guangxi province were investigated, and its potential ecological risk for agricultural utilization was assessed. The average concentrations of total nutrients （nitrogen, phosphorous, potassium） and organic matter of the sewage sludge were 87. 1 lg/kg and 34.63% respectively, which was similar to the organic fertilizer. The concentrations of Zn, Cd are 1095.75, 16.22 mg/kg respectively, and higher than national standards for agricultural utilization, but other metals don＇ t. In the sludge, the main chemical speciation of all seven heavy metals was generally stable. While the exchangeable fraction of As was higher than other elements, and Fe-Mn Oxide-bond fraction was main speciation of other heavy metals. The results of ecological risk assessment showed that Cd had a high ecological risk and Cd should be considered emphatically in the treatment and disposal of the sewage sludge of Guangxi.
出处
《环境工程》
CAS
CSCD
北大核心
2014年第1期108-112,共5页
Environmental Engineering
基金
广西矿冶与环境科学实验中心资助项目(KH2012ZD004)
国家自然科学基金(41161075)
广西"八桂学者"建设工程专项经费资助
广西科学研究与技术开发计划项目(桂科攻11107021-6-1)
广西环境污染控制理论与技术重点实验室研究基金(桂科能0901Z022)
关键词
城市污泥
有机质
养分
重金属
生态风险评价
urban sludge
organic matter
nutrients
heavy metals
ecological risk assessment
