Vertical profile of soil/sediment pollution and microbial community change by e-waste recycling operation

• Published in: The Science of the total environment Vol. 669; pp. 1001 - 1010
• Main Authors: Wu, Qihang, Du, Yongming, Huang, Zhuying, Gu, Jidong, Leung, Jonathan Y.S., Mai, Bixian, Xiao, Tangfu, Liu, Wen, Fu, Jie
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 15.06.2019
• Subjects: China; Electronic waste; Electronic Waste - adverse effects; Environmental Monitoring; Geologic Sediments - analysis; Halogenated flame retardant; Heavy metal; Microbial community; Microbiota - drug effects; Recycling - methods; RNA, Bacterial - analysis; RNA, Ribosomal, 16S - analysis; Sequence Analysis, RNA; Soil Pollutants - adverse effects; Soil Pollutants - analysis; Water Pollutants, Chemical - adverse effects; Water Pollutants, Chemical - analysis; China; Electronic waste; Halogenated flame retardant; Microbial community; Heavy metal
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2019.03.178

The present study aims to assess the effect of electronic waste (e-waste) recycling on microbial community and the underlying modulation mechanism. Core soil/sediment samples were collected from an abandoned e-waste burning site and neighboring farmland/stream sites in Guiyu, China. High concentrations and health risks of toxic heavy metals, particularly, Sb and Sn, and halogenated flame retardants (HFRs), including decabromodiphenyl ether (BDE 209) and decabromodiphenyl ethane (DBDPE) were mostly retained at the top surface layers of soils/sediments (0–30cm) after more than one year of natural vertical diffusion and microbe-facilitated biodegradation. Heavy metals, such as Ag, Cd, Cu, Pb, Sb, and Sn, played a critical role for the reduction of microbial diversity. This is the first study reporting the open burning of e-waste caused an obvious heat effect and enriched thermophilic/mesophilic microbes in local area. The acid washing during e-waste recycling process may result in the enrichment of acidophilic microbes. This investigation showed that e-waste processing operation resulted in not only severe pollution of the soils/sediments by various pollutants, but also reduction of microbial diversity that was difficult to self-store by the local ecosystem. [Display omitted] •E-waste recycling activities caused serious pollution of metals/flame retardants.•Metal pollutants posed a significant impact on microbial richness/diversity.•Niche filtering is the mechanism of shaping microbial community by pollutants.•Open burning of e-waste resulted in enrichment of thermophilic/mesophilic microbes.•Appropriate remediation is needed to alleviate e-waste recycling pollution.