摘要
以施用城市污泥堆肥的土壤为对象,研究添加不同量污泥堆肥后土壤中重金属含量变化和土壤对Cu^(2+)的吸附能力的变化.结果表明:施用污泥堆肥后,在不同处理水平下,除Cd外,土壤中各重金属含量均不超过原有含量水平,重金属污染风险较小;土壤对Cu^(2+)的吸附模型符合Langmuir方程,其相关系数R2均大于0.9,属于单分子吸附;污泥堆肥施用量低于2 000 kg/亩时比较适宜,在此添加量下,土壤中肥效增加明显,同时可有效减少土壤对Cu^(2+)的吸附.
In order to understand the accumulation rules of heavy metals in soil,the effects of municipal sludge composts on the content of heavy metals,adsorption capacity of copper and the content of nutriment in soil were studied. The results showed that the content of metal heavy metals in soil had little difference before and after adding municipal sludge composts. The adsorption isotherms of copper in the samplesagree well with the Langmuir equation with all correlation coefficients of above 0. 9. Furthermore the application amount of municipal sludge composts should be controlled under 2 000 kg / mu. The addition of municipal sludge composts under2 000 kg / mu could not only reduce the adsorption capacity of copper,but also increase the content of nutriment in soil.
出处
《轻工学报》
CAS
2016年第5期20-24,共5页
Journal of Light Industry
基金
国家水体污染控制与治理科技重大专项子课题(2012ZX07204-001)
关键词
城市污泥
堆肥
土壤
重金属累积
吸附能力
municipal sludge
com posts
soil
heavy metals accumulation
adsorp tion capacity
