城市污泥发酵物土地利用重金属迁移变化研究

摘要

This paper studied on the risk of heavy metal migration caused by using sewage sludge composting as sod sub-strate.Compared with control samples, results showed no significant increase in heavy metal migration at horizontal and vertical level as composting application rate rises from 45 to 75t/hm2.It is concluded that taking sludge compost as sod substrate has little impact on heavy metal migration in subsurface flow and surface runoff in the short-term.%文章针对污泥发酵物开展替代草坪基质的规模化应用,对其重金属迁移风险进行了分析,通过对重金属在纵向和横向水平上的迁移量变化进行比较的结果表明,与常规对照相比,随污泥发酵物施用量(45~75 t/hm2)提高,重金属(As、Cd、Ni、Pb、Cu、Zn)在地下纵向和地表横向水平上的迁移量无显著性增加.结果表明污泥发酵物应用于草坪基质,在短期(两年)内,由地下渗流和地表径流引起的重金属迁移量甚微,施用区域内地下水和周边土壤的环境安全性较高.