Biodegradation of microcystin-LR using acclimatized bacteria isolated from different units of the drinking water treatment plant

Environmental Pollution
Pratik KumarRosa Galvez-Cloutier

Abstract

Bacterial community isolated from different units of a Drinking Water Treatment Plant (DWTP) including pre-ozonation unit (POU), the effluent-sludge mixture of the sedimentation unit (ESSU) and top-sand layer water sample from the filtration unit (TSFU) were acclimatized separately in the microcystin-leucine arginine (MC-LR)-rich environment to evaluate MC-LR biodegradation. Maximum biodegradation efficiency of 97.2 ± 8.7% was achieved by the acclimatized-TSFU bacterial community followed by 72.1 ± 6.4% and 86.2 ± 7.3% by acclimatized-POU and acclimatized-ESSU bacterial community, respectively. Likewise, the non-acclimatized bacterial community showed similar biodegradation efficiency of 71.1 ± 7.37%, 86.7 ± 3.19% and 94.35 ± 10.63% for TSFU, ESSU and POU, respectively, when compared to the acclimatized ones. However, the biodegradation rate increased 1.5-folds for acclimatized versus non-acclimatized conditions. The mass spectrometry studies on MC-LR degradation depicted hydrolytic linearization of cyclic MC-LR along with the formation of small peptide fragments including Adda molecule that is linked to the reduced toxicity (qualitative toxicity analysis). This was further confirmed quantitatively by using Rhizobium meliloti a...Continue Reading

Citations

Apr 25, 2020·Toxins·Isaac Yaw Massey, Fei Yang
Nov 27, 2019·Ecotoxicology and Environmental Safety·Peng GuXingzhang Luo
May 20, 2021·Environmental Science and Pollution Research International·Gabriela Rocío Sosa BenegasMichel Rodrigo Zambrano Passarini

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