摘要
该文通过土培实验、BCR连续分级提取法和简化生物可给性提取in vitro方法,研究了污泥堆肥的添加对农田土壤中Cr、Cu、Pb和Zn形态分布和生物可给性的影响。结果表明,污泥堆肥的添加显著增加了土壤中4种重金属的总量。随污泥堆肥添加量增加,4种重金属残渣态的比例下降幅度在12%~42%之间,同时生物可给性呈上升趋势。风险评估编码评估表明,添加污泥堆肥的农田土中Zn呈低至中等生态风险,Cr呈低生态风险,而Cu、Pb不构成生态风险。健康风险评估表明,添加污泥堆肥的农田土中经口摄入的4种重金属元素对儿童和成人产生的总非致癌风险和致癌风险均在可接受范围内,表明添加污泥堆肥土壤不会对人体和生态产生显著风险。
A laboratory experiment was conducted involving farmland soil incubation, BCR sequential extraction procedure and simplified bio-accessibility extraction test(SBET) with a purpose to investigate the effects of sludge compost of a wastewater treatment plant, which was added to the soil sample, on the speciation of heavy metal(Cr, Cu, Pb and Zn) and the relevant bio-accessibility. The experiment showed that the addition of sludge compost significantly increased total heavy metals concentrations in the soil, and the decrease of residual fraction of heavy metals ranging from 12% to 42%, while the bioaccessibility of heavy metals in soils increases with the increasing addition of sludge. Furthermore, relevant risk assessment was carried out by RAC(risk assessment code), and the result indicated that Zn in the soil added with sludge compost posed a low to medium ecological risk while Cr posed low ecological risk;besides, the health risk assessment revealed that the total non-carcinogenic risk(HI) and carcinogenic risk(CR) to children and adults caused by sludge-compost-added soil were within the acceptable range.
作者
宋繁永
杨笑乐
郭可欣
傅晓文
李天元
SONG Fanyong;YANG Xiaole;GUO Kexin;FU Xiaowen;LI Tianyuan(Shandong Provincial Key Lab of Applied Microbiology,Ecology Instituteof Qilu Universityof Technology,Shandong Academy of Sciences,Ji'nan 250103,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第3期171-177,共7页
Environmental Science & Technology
基金
山东自然科学基金(ZR2021QD115)
国家重点研发计划课题(2019YFC1804103)
NSFC-山东联合基金(U1906222)。
关键词
污泥堆肥
土壤
重金属
赋存形态
体外方法
生态风险
健康风险
sludge compost
soil
heavy metal
mode of occurrence of elements
in vitro approach
ecological risk
health risk
