摘要
以采煤沉陷地粉煤灰充填复垦土壤的污染问题为研究背景,从措施的实地可操作性出发进行实验设计,采取了灰土、灰矸不同比例混合和隔层排列处理措施,对淋溶液中各检测元素的含量进行了分析和比较。结果表明,粉煤灰中大部分元素在淋溶液中含量高,淋溶作用强烈;在各种元素中,大多数污染重金属元素在淋溶液中的含量极低,只有铬的含量略高。不同处理设施对粉煤灰的淋溶特性有显著影响。
A 40 day leaching experiment, aiming at the problem of soil pollution on the filled subsidence land with flying ash, taking three treatments of mixing flying ash with soil, mixing flying ash with coal wastes, and setting soil interlayer was conducted. The contents of tested elements in the leachates were analyzed. Results showed that Ca, Mg and Na were strong leaching elements, with contents of 655 mg·L-1, 162 mg·L-1 and 153 mg·L-1 in the leachates; respectively, K, Si, B, Mo, Li, Sr, Cr, V and Ba were weak leaching elements, whose contents were between 1.0 mg·L -1—16.0 mg·L-1,. while P, Ba, Al, As, Zn, Cu, Ni, Fe, Se, Co, Cd, Pb, Ti, Ag, Be, Bi, Ni and Mn were extremely weak or even not leaching elements, with contents of between 0.0 mg·L-1— 0.5 mg·L-1. Flying may result in high salt content in surface layer of covered soil associating with harmful to crops' growth. The flying ash contains higher heavy metal contents, but risk is little due to high pH of flying ash,. which can reduces absorption of Cu and Zn by crops. The content of Cd in the flying ash exceeds the national soil environmental criterion, but its mobility is very low; The content of Cr in the leachates is high. The treatments of mixing flying ash with coal wastes and setting soil interlayer can effectively decrease the content of Cr in the soil water.
出处
《农业环境保护》
CSCD
北大核心
2002年第1期13-15,18,共4页
Agro-Environmental Protection
基金
国家自然科学基金资助项目(49701010
40071045)
关键词
采煤沉陷地
充填复垦
粉煤灰
淋溶特性
土地复垦
土壤元素
实验
coal mining subsidence land
flying ash
filling reclamation
coal wastes
leaching characteristics
