污水厂污泥植物修复后农用的试验研究(英文)

Experimental study on agricultural utilization of dewatered sludge after phytoremediation

以美人蕉、草坪草、牛筋草为试材,进行了植物修复污泥重金属污染的盆栽试验,对植物修复后污泥中的重金属含量及营养成分进行了分析,研究了植物修复后污泥农业利用的可行性.结果表明,直接施用污泥增加了土壤中的重金属含量,容易导致土壤污染,而植物修复后污泥中的铜、锌、铅、镉、铬、镍等重金属的含量大大降低,符合污泥农用的国家标准;有机质、总氮、总磷等营养物质的含量并无明显下降,能够继续为污泥农用提供充足的养分.污泥植物修复后再进行农业利用,可以降低危害人类健康的风险,植物修复—农业利用可作为城市污水厂污泥的一种有效的综合处理处置方法.

Potted planting experiment of Canna indica,Cynodon dactylon and Eleusine indica were used to study on phytoremediation of dewatered sludge polluted by heavy metals.Components of heavy metals and nutrients in dewatered sludge were analyzed after phytoremediation.The feasibility of agricultural utilization after phytoremediation was researched.The results showed that,applying dewatered sludge directly would lead to soil pollutions easily because of increasing the concentrations of heavy metals in soil.While after phytoremediation,the concentrations of Cu,Zn,Pb,Cd,Cr and Ni,which had been greatly reduced,all accord with national standards of sludge agricultural utilization;and the concentrations of organic matter,total nitrogen and total phosphorus,had no obvious decrease.There were enough nutrients for continuing offering to agricultural utilization.The risks to human health could be reduced when sludge was used for agricultural utilization after phytoremediation.Phytoremediation-agricultural utilization could be taken as an effective synthesis method for sludge disposal.