水葱对矿山排水中重金属的去除研究

通过研究湿地挺水植物水葱（Scirpus validus）对矿山排水中重金属（Cu、Zn、Ni、Mn、Cd）的去除效果,发现水葱对Ni、Mn、Cd的去除效果非常好,浓度去除率均达到80%以上,对Cu、Zn的浓度去除率稍微偏低.水葱吸收到体内的重金属元素主要集中在地下根部;水葱对各种金属元素的去除存在一定的协同作用;水葱蒸腾量的增加在一定程度上能促进水葱对重金属的去除.通过水葱处理后的重金属废水达到GB 8978—1996国家综合排放一级标准.

The Removal Effection of Scirpus Validus on Heavy Metals in Mine Drainage

A hydroponic experiments for emergent plant Scirpus validus was carried out to measure it’s removal effection on 5 heavy metals(Cu、Zn、Ni、Mn、Cd)in mine drainage.The results suggested that Scirpus validus had an effective concentration removal rate on Ni、Mn、Cd,with a high rate exceed 80%;In addition,it’s concentration removal rate on Cu、Zn was not so good.It was proved that the heavy metals absorbed into Scirpus validus were mainly gathered in it’s root under ground,and there was a synergistic effect between 5 heavy metals when they been removed.Meanwhile,a positive correlation between Scirpus validus’s transpiration and it’s removal effection on 5 heavy metals has been proved.finally,after purify with Scirpus validus,the mine drainage has reached the first level of integrated wastewater discharge standard(GB 8978—1996).