摘要
通过对南宁市市政污水处理厂脱水污泥及资源化产品的重金属特性及污染风险进行调查分析。调查分析结果表明:污泥中除重金属Hg,Cd以外,其余重金属含量均达到GB 4284-2018《农用污泥污染物控制标准》中的A级标准;部分时段的重金属Hg,Cd仅达到B级标准,存在一定潜在污染风险;通过加强控制污泥堆肥过程中的重金属含量,合理调配施用比例,使得经过堆肥处理的污泥重金属含量均达到A级污泥限值要求,降低了潜在生态风险指数和在园林绿化等方面进行污泥资源化利用的风险。
In this study,heavy metal characteristics and pollution risk of dehydrated sludge and resource products from typical municipal sewage treatment plants in Nanning were investigated and analyzed.The results showed that,the contents of heavy metals in the sludge all reached the A-level standard in the"Control standards of pollutants in sludge for agricultural use"(GB 4284-2018)except for Hg and Cd,which the contents only reached the standard of B level in some periods.In some periods,Hg and Cd only reach grade B standard,and there was a potential pollution risk.The heavy metal content of sludge all reached the limit requirements of grade A sludge after composting treatment,and which the potential ecological risk index was low.The risk of sludge recycling in landscaping and other aspects could be small,by strengthening the control of sludge compost and optimizing the application ratio of sludge products.
作者
徐荣乐
黄业翔
许谦
韦士程
赵侣璇
宋晓薇
XU Rong-le;HUANG Ye-xiang;XU Qian;WEI Shi-cheng;ZHAO Lü-xuan;SONG Xiao-wei(Scientific Research Academy of Guangxi Environmental Protection,Nanning 530022,China;Guangxi Lvcheng Water Co.,Ltd,Nanning 530022,China)
出处
《环境科技》
2022年第1期51-56,共6页
Environmental Science and Technology
基金
广西科技重大专项(桂科AA18118013).
关键词
市政污泥
资源化产品
重金属
风险评价
Municipal sludge
Resource products
Heavy metal
Risk assessment