Abstract
Purpose
East Kolkata Wetlands (EKW), a collection of low-lying natural wetlands located on the eastern outskirts of Kolkata, India, present a natural setting for efficient sewage treatment within 9 to 12 days. The suspended solids from the water column are removed by sedimentation due to gravity largely within Day 0 to Day 6 and thereby creating an oxygen demand at the soil–water interface of the wetland ecosystem. This study investigated the underlying mechanisms by which soil microorganisms reduce this oxygen demand and drive efficient sewage purification.
Methods
To this end, different metabolic activity assays of soil microorganisms were performed. Additionally, various soil parameters that influence the sewage treatment process including soil moisture content and availability of anaerobic electron acceptors were explored.
Results
The results demonstrated that before the introduction of sewage, the moisture content of the wetland soil was exceedingly low and it increased markedly upon the introduction of sewage. Additionally, anaerobic electron acceptors were abundantly available during the early phase of treatment. Results also demonstrated that the anaerobic metabolic activity of soil microorganisms increased several folds at the onset of sewage treatment. The rewetting of soil led to hydrolytic activity of anaerobic soil microorganisms. Heightened microbial metabolic activity under anoxic and oxygen-depleted conditions led to increased biodegradation of sewage organic matter. Subsequently, as the environment turned oxic, aerobic microbial activity increased facilitating aerobic degradation.
Conclusion
The high oxygen demand of sewage was reduced competently through the metabolic activities of the wetland microorganisms within the soil–water interface without any exogenous addition of oxygen.
Graphical Abstract
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Data Availability
The data generated during this study are available from the corresponding author upon request.
Code Availability
All statistical analyses were performed in Microsoft Office Excel 2007 and SPSS-11(on line version).
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Acknowledgements
ADG is supported by CU-DBT IPLS program (Sanction No. 1952/71 AGOI Dated 13.10.2011). Authors would like to thank Dr. Phanibhusan Ghosh and Dr. Prosun Tribedi for helpful discussions. Authors would also like to thank Prof. Srimonti Sarkar for critical reading of the manuscript.
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ADG carried out the majority of the work, designing of experiments, field survey, sample collection, performance of experimental work, analysis and interpretation of data and was involved in writing the manuscript. SS participated in designing of experiments and field survey. JPS participated in field survey, and sample collection. TS participated in conceiving the idea, designing of experiments, field survey, and was involved in interpretation of data. AKS participated in conceiving the idea, designing of experiments, analysis and interpretation of data and was involved in writing the manuscript. All authors read and approved the final manuscript.
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Das Gupta, A., Sarkar, S., Singh, J. et al. Metabolic Dynamics of Soil Microorganisms of the Aquatic Ecosystem is a Key Component for Efficient Sewage Purification in Single Pond Natural Treatment Wetlands at East Kolkata Wetland. Waste Biomass Valor 13, 4611–4624 (2022). https://doi.org/10.1007/s12649-022-01806-w
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DOI: https://doi.org/10.1007/s12649-022-01806-w