引用本文:李清芳, 姚靖, 黄晓容, 张永江, 刘先良, 宋卫华, 王祥炳.黔江区污水处理厂污泥中重金属生态风险评价与健康风险评估[J].西南大学学报(自然科学版),2019,41(3):120~129
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黔江区污水处理厂污泥中重金属生态风险评价与健康风险评估
李清芳, 姚靖, 黄晓容, 张永江, 刘先良, 宋卫华, 王祥炳
重庆市黔江区生态环境监测站, 重庆 黔江 409000
摘要:
采用ICP,AAS,AFS法测定了重庆市黔江排水有限公司污水处理厂终端污泥中9种重金属(Zn,Cr,Cu,Mn,Ni,Pb,As,Cd,Hg)的质量分数,并采用内梅罗综合污染指数法、Hakanson潜在生态危害法、Muller地累积指数法对污泥中9种重金属生态风险进行评价,同时,基于US EPA健康风险评价模型对5种重金属(Zn,Cu,Mn,Pb,Hg)进行非致癌健康风险评估,对另外4种重金属(Cr,Ni,As,Cd)进行致癌健康风险评估.生态风险评价表明,Ni,Cr,Pb无污染,生态危害程度很低,但Muller地累积指数法分析显示Cu,Zn,Hg,As存在一定生态危害风险,同时,Hakanson潜在生态危害风险评价和Muller地累积指数法评价均表明,Cd生态危害程度较高;健康风险评估表明该厂污泥中重金属基本不存在非致癌健康风险和致癌健康风险,但Cu,Mn的非致癌总风险相对较高,且各重金属经手口摄入途径产生最高非致癌健康风险,儿童所承受的非致癌健康风险高于成人约5.9倍,但儿童所承受的总致癌健康风险略低于成人.
关键词:  污泥  重金属  内梅罗综合污染指数  潜在生态危害  地累积指数  非致癌健康风险  致癌健康风险
DOI:10.13718/j.cnki.xdzk.2019.03.017
分类号:X703;X824
基金项目:黔江区科技计划项目(黔科计2016063);重庆市基础与前沿研究计划项目(cstc2015jcyjA20004).
Ecological Risk Evaluation and Health Risk Assessment on Heavy Metals in Sludge of the Sewage Treatment Plant in Qianjiang District
LI Qing-fang, YAO Jing, HUANG Xiao-rong, ZHANG Yong-jiang, LIU Xian-liang, SONG Wei-hua, WANG Xiang-bing
Ecological Environment Monitoring Station in Qianjiang District, Qianjiang Chongqing 409000, China
Abstract:
Systematic measurement was made of the contents of 9 heavy metals (Zn, Cr, Cu, Mn, Ni, Pb, As, Cd and Hg) in the final sludge of the Sewage Treatment Plant of Qianjiang Drainage Co., Ltd. in Chongqing. The Nemerow comprehensive pollution index method, Hankanson potential ecological risk assessment and Muller geoaccumulation index were used to evaluate the ecological risk of the 9 heavy metals. Based on the health risk assessment of US EPA, non-carcinogenic health risk assessment and carcinogenic health risk assessment were made, respectively, of 5 non-carcinogenic heavy metals (Zn, Cu, Mn, Pb and Hg) and 4 carcinogenic heavy metals (Cr, Ni, As and Cd). Ecological risk evaluation indicated low pollution and no ecological hazard of Ni, Cr and Pb, but Hankanson potential ecological risk assessment demonstrated a certain degree of ecological hazard of Cu, Zn, Hg and As. Both Hankanson potential ecological risk assessment and Muller geoaccumulation index method revealed a rather high ecological risk of Cd. Health risk assessment showed virtually nonexistent non-carcinogenic risk and carcinogenic risk of the heavy metals in the sludge of the sewage treatment plant, but Cu and Mn generated relatively high non-carcinogenic risks, and the hand mouth intake exposure pathway produced relatively high non-carcinogenic risk. In addition, the total non-carcinogenic risk superimposed on children was about 5.9 times higher than that superimposed on adults, but the total carcinogenic risk superimposed on children was slightly lower than that superimposed on adults.
Key words:  sludge  heavy metal  Nemerow comprehensive pollution index  potential ecological risk  geoaccumulation index  non-carcinogenic health risk  carcinogenic health risk
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