红枫湖水源地附近粉煤灰堆积场重金属存在形态及静态淋溶规律

酸雨对露天粉煤灰堆积场的淋滤作用导致周围环境产生重金属污染是一种广泛现象.为研究酸雨对贵阳市水源地红枫湖周边一大型粉煤灰堆积场的重金属迁移影响,本文以这一粉煤灰堆积场为研究对象,通过静态淋溶实验探讨了粉煤灰中Cr、Ni、CU、Zn、AS、Cd、Pb等7种重金属元素的含量、存在形态、淋溶时间、堆积时间、粒度对重金属溶出规律的影响.结果表明,粉煤灰中Ni、Cu、Zn、Pb、As和Cd等6种重金属的含量随堆积时间增加而增大,Cr含量变化与上述反之;在淋溶实验中,堆积时间的增加使Cr、Ni、Cu和Zn重金属元素的可溶态减小;在淋溶第28—48天期间,Cr、Ni和Cu元素溶出浓度降低的粒度顺序为细粒度>中粒度和粗粒度、Cd元素溶出浓度降低的粒度顺序为中粒度>粗粒度>细粒度.本研究对红枫湖水源地和周边地下水的重金属防控提供一定的参考依据.

Heavy metal existence and static leaching rules in fly ash accumulation field near Hongfeng Lake water source

It is a widespread phenomenon that the leaching effect of acid rain on the open-air fly ash storage site causes heavy metal pollution to the surrounding environment.To study the effect of acid rain on heavy metal migration in a fly ash accumulation field near Hongfeng Lake,by static leaching experiment,this research investigated the effects of content,fraction distribution,leaching time,stacking time,and particle size of seven heavy metal elements(Cr,Ni,Cu,Zn,As,Cd,and Pb)in fly ash on the dissolution of heavy metals.The results showed that:The contents of Ni,Cu,Zn,Pb,As,and Cd in fly ash increased with the increasing of the stacking time,while opposite case happened on Cr.In the leaching experiment,the increase of the accumulation time reduced the percentage of soluble states of Cr,Ni,Cu and Zn;Within 28-48 d of leaching,the order of the particle size of the reduction of the dissolution concentration of Cr,Ni and Cu was fine fraction>medium fraction and coarse fraction,and the order of affecting Cd was medium fraction>coarse fraction>fine fraction.This study provided a certain reference for the prevention and control of heavy metals in the water source area of Hongfeng Lake and the surrounding groundwater.