Abstract
The engineered-Soil Aquifer Treatment (e-SAT) system was exploited for the biological degradation of Sulfamethoxazole (SMX) which is known to bio-accumulate in the environment. The fate of SMX in soil column was studied through laboratory simulation for a period of 90 days. About 20 ppm SMX concentration could be removed in four consecutive cycles in e-SAT. To understand the microbial community change and biological degradation of SMX in e-SAT system, metagenomic analysis was performed for the soil samples before (A-EBD) and after SMX exposure (B-EBD) in the e-SAT. Four bacterial phyla were found to be present in both the samples, with sample B-EBD showing increased abundance for Actinobacteria, Bacteroidetes, Firmicutes and decreased Proteobacterial abundance compared to A-EBD. The unclassified bacteria were found to be abundant in B-EBD compared to A-EBD. At class level, classes such as Bacilli, Negativicutes, Deltaproteobacteria, and Bacteroidia emerged in sample B-EBD owing to SMX treatment, while Burkholderiales and Nitrosomonadales appeared to be dominant at order level after SMX treatment. Furthermore, in response to SMX treatment, the family Nitrosomonadaceae appeared to be dominant. Pseudomonas was the most dominating bacterial genus in A-EBD whereas Cupriavidus dominated in sample B-EBD. Additionally, the sulfur oxidizing bacteria were enriched in the B-EBD sample, signifying efficient electron transfer and hence organic molecule degradation in the e-SAT system. Results of this study offer new insights into understanding of microbial community shift during the biodegradation of SMX.
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Acknowledgements
The authors are thankful to Council of Scientific and Industrial Research for providing necessary facilities and financial support to carry out this research. Ashwinkumar P. Rudrashetti is grateful to University Grant Commission (UGC), India for the award of a junior research fellowship. The manuscript represents communication number, CSIR-NEERI/KRC/2016/AUG/EBGD/3.
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Rudrashetti, A.P., Jadeja, N.B., Gandhi, D. et al. Microbial population shift caused by sulfamethoxazole in engineered-Soil Aquifer Treatment (e-SAT) system. World J Microbiol Biotechnol 33, 121 (2017). https://doi.org/10.1007/s11274-017-2284-8
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DOI: https://doi.org/10.1007/s11274-017-2284-8