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Next-generation sequencing showing potential leachate influence on bacterial communities around a landfill in China
Rajasekar, Adharsh Sekar, Raju Medina-Roldán, Eduardo Bridge, Jonathan Moy, Charles K S
Rajasekar, Adharsh
Sekar, Raju
Medina-Roldán, Eduardo
Bridge, Jonathan
Moy, Charles K S
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2018-04-10
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Abstract
The impact of contaminated leachate on groundwater from landfills is well known, but the specific effects on bacterial consortia are less well-studied. Bacterial communities in a landfill and an urban site located in Suzhou, China, were studied using Illumina high-throughput sequencing. A total of 153 944 good-quality reads were produced and sequences assigned to 6388 operational taxonomic units. Bacterial consortia consisted of up to 16 phyla, including Proteobacteria (31.9%-94.9% at landfill, 25.1%-43.3% at urban sites), Actinobacteria (0%-28.7% at landfill, 9.9%-34.3% at urban sites), Bacteroidetes (1.4%-25.6% at landfill, 5.6%-7.8% at urban sites), Chloroflexi (0.4%-26.5% at urban sites only), and unclassified bacteria. Pseudomonas was the dominant (67%-93%) genus in landfill leachate. Arsenic concentrations in landfill raw leachate (RL) (1.11 × 103 μg/L) and fresh leachate (FL2) (1.78 × 103 μg/L) and mercury concentrations in RL (10.9 μg/L) and FL2 (7.37 μg/L) exceeded Chinese State Environmental Protection Administration standards for leachate in landfills. The Shannon diversity index and Chao1 richness estimate showed RL and FL2 lacked richness and diversity when compared with other samples. This is consistent with stresses imposed by elevated arsenic and mercury and has implications for ecological site remediation by bioremediation or natural attenuation.
Citation
Rajasekar, A., Sekar R., Medina-Roldán E., Bridge, J., Moy, CKS., Wilkinson, S. (2018) 'Next-generation sequencing showing potential leachate influence on bacterial communities around a landfill in China', Canadian Journal of Microbiology, 64 (8) pp. 537-549. doi: 10.1139/cjm-2017-0543
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PubMed ID
29633622
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Journal article
Language
en
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ISSN
0008-4166