两种杂草修复污水厂污泥重金属污染的应用研究

以酸模叶蓼(Polygonum lapathifolium)、牛筋草(Eleusine indica)为试材,通过盆栽试验研究了杂草对污泥重金属Cu、Zn、Pb、Cd、Cr、Ni的去除效果.结果表明,酸模叶蓼对Zn的去除率达到61.73%,对Ni的去除率为45.75%.对Zn、Ni具有良好的富集作用,可用于修复以Zn、Ni为主的重金属污染.将污泥与土壤按1∶3混合作为牛筋草的培养土,并适当地增加收割牛筋草的次数,能显著提高修复效率;牛筋草对Cu、Zn、Cd、Ni具有良好的富集作用,可作为Cu、Zn、Cd、Ni污染的修复植物.

Application of two weeds in the remediation of heavy metals in sewage sludge of wastewater treatment plant

Weeds of Dockleaf Knotweed (Polygonum lapathifolium) and Goosegrass herb (Eleusine indica) were used to remove the heavy metals of Cu, Zn, Pb, Cd, Cr, and Ni in the sewage sludge by potted planting. The results showed that 61.73% of Zn and 45.75% of Ni could be removed by Dockleaf Knotweed, so Dockleaf Knotweed had high enriching abilities of Zn and Ni, and it could be used for the remediation of soil contaminated mainly by Zn and Ni. Taking the soil mixed by sludge and crimson soil according to the proportion 1∶3 to cultivate Goosegrass herb and increasing the harvesting times could enhance the removal efficiency of heavy metals significantly. Goosegrass herb could be considered as the remediation plant for Cu, Zn, Cd and Ni.