Typical heavy metal contents (Hg, Cd, Pb and Cr) of 22 dry basis samples were analyzed by taking Guangzhou municipal solid waste (MSW) for research object. Methods of pollution index and potential ecological risk index were employed to evaluate the heavy metal pollution levels and potential ecological risk. The Pearson correlation analysis was used to discuss the possible sources of Hg, Cd, Pb and Cr in the MSW. Research results indicated that: (1) the average concentrations of Hg, Cd, Pb and Cr in Guangzhou MSW were 0.435 mg/kg, 1.487 mg/kg, 71.865 mg/kg and 136.088 mg/kg, respectively. The pollution level of Cd was highest, and followed by Hg, Pb and Cr pollution were not obvious. Result of single contamination index showed that there were 40.9%, 22.7%, 4.5% and18.1% samples exceeded the pollution grade standard of Cd, Hg, Pb and Cr, respectively. Most of samples suffered multi-metals compound contamination, and the over standard rate of comprehensive contamination index was 63.6%. (2) The risk level of Cd was highest, and followed by Hg, while Pb and Cr had no potential ecological risks; the over standard rate of potential ecological risk indices of heavy metal pollutants was 45.5%, and risk indices for some samples have reached the grade of high potential ecological risk. (3) Contents of Cd and Pb in MSW were possibly mainly from metal components. Contents of Hg and Cr in MSW probably mainly derived from white plastic and paper ingredients, respectively.
TANG Zhi-hua
,
HUHE Tao-li
,
XIONG Zu-hong
,
GUO Hua-fang
,
CHEN Yong
,
FANG Ke-jing
. Typical Heavy Metal Pollution and Ecological Risk Assessment for Guangzhou Municipal Solid Waste[J]. Advances in New and Renewable Energy, 2018
, 6(2)
: 130
-139
.
DOI: 10.3969/j.issn.2095-560X.2018.02.007
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