摘要
阐述了我国城市污泥重金属区域分布特征和发展趋势以及产生区域差异的因素,对污泥重金属进行了污染评价分析、潜在环境风险分析及健康风险分析。提出Cu、Pb、Zn、Cd、Cr、Ni的含量由南向北递减,Hg、As的含量则在北方地区占较大比重;城市污泥重金属含量总体上均呈良好的下降趋势,但仍然普遍存在着超标现象,污泥农用依旧受到限制,且不同形态的重金属表现出不同的生物毒性和环境行为,污泥二次污染带来的严重隐患和环境风险不容忽视。
The characteristics of regional distribution and development trend of heavy metals in municipal sludge in China and the factors causing regional differences were comprehensively described. The pollution assessment, potential environmental risk analysis and health risk analysis of heavy metals in sludge were presented. It is put forward that the content of Cu, Pb, Zn, Cd, Cr and Ni decreases from south to north while the content of Hg, and As accounts for a larger proportion in the northern region; the contents of heavy metals in municipal sewage sludge generally show a good downward trend, but the phenomenon of exceeding the standard is still existing; the agricultural sludge is still limited, and different forms of heavy metals show different biological toxicity and environmental behavior, so serious hazards and environmental risks caused by sewage sludge＇ s secondary pollution can not be ignored.
出处
《煤炭与化工》
CAS
2017年第7期22-25,157,共5页
Coal and Chemical Industry
关键词
污水处理厂
城市污泥
重金属
环境问题
二次污染
污泥农用
sewage treatment plant
municipal sludge
heavy metal
environmental problem
secondary pollution
agricultural sludge
