摘要
通过室内培养试验,研究粉煤灰、石灰和改性污泥3种改良剂对铜矿区污染土壤重金属的钝化效果和作用机理。结果表明,3种改良剂均可有效地钝化土壤中的Cu,使土壤重金属的TCLP浸出质量分数降至国际标准以下,其作用效果依次为石灰>粉煤灰>改性污泥。两种碱性物质显著提高土壤p H,通过吸附和共沉淀作用将交换态和碳酸盐结合态Cu转化为铁锰氧化物结合态和残渣态。改性污泥通过络合和配位作用提高土壤Cu有机结合态和残渣态的比例。
The deactivating effect and mechanism of three kinds of amendments namely fly ash, lime and modified sludge,were studied by soil incubation in lab. The results showed that three kinds of amendments could deactivate soil Cu significantly, and the TCLP（Toxicity characteristic leaching procedure）leaching content of Cu, Zn and Cd were lower than the standard limitation. The deactivating effect of the test amendments on heavy metals are lime, fly ash, modified sludge in turn.Transformation of copper fractions caused by lime and fly ash was from exchangeable and carbonate-bound to Fe-Mn oxidebound and residual, while the transformation of heavy metal fractions caused by the modified sludge was mainly between exchangeable and organic-bound.
出处
《湖北农业科学》
2016年第2期306-309,共4页
Hubei Agricultural Sciences
基金
江西省教育厅项目(GJJ13504)
