Microbial Evaluation of Groundwater and its Implications on Redox Condition of a Multi-Layer Sedimentary Aquifer System
| Autor: | M. Bala Krishna Prasad, Petha Perumal, Tirumalesh Keesari, Divya Prakash, S. Chidambaram, K. L. Ramakumar, Neelu Nawani |
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| Rok vydání: | 2015 |
| Předmět: |
Hydrology
Pollution chemistry.chemical_classification Total organic carbon geography Environmental Engineering geography.geographical_feature_category Health Toxicology and Mutagenesis Earth science media_common.quotation_subject Aquifer Management Monitoring Policy and Law Arsenic contamination of groundwater chemistry Sedimentary rock Organic matter Sulfate-reducing bacteria Groundwater Geology Water Science and Technology media_common |
| Zdroj: | Environmental Processes. 2:331-346 |
| ISSN: | 2198-7505 2198-7491 |
| DOI: | 10.1007/s40710-015-0067-5 |
| Popis: | A synoptic microbial assessment of groundwater has been carried to describe the groundwater quality and its geochemical environment in the Pondicherry region located in the southeast part of India. Spatial and vertical variability in dissolved oxygen (DO) and chemical species clearly explain that regional geological settings associated with human pressure are controlling the groundwater quality in this region. Results show that the abundance of bacteria is positively related to DO, total organic carbon (TOC) and inversely related to well depth, whereas sulphate reducing bacteria (SRB) present at some locations do not show any systematic trend with the above parameters. About half of the measured groundwater samples showed presence of E. coli. Some suboxic deep aquifers (DO ≤ 2 mg/L) showed presence of E.coli which are not commonly observed. SRB are found mostly in deeper Tertiary and Cretaceous aquifers reflecting presence of reducing conditions. The rapid accumulation of organic matter associated with heterotrophic conditions has increased the prevalence of redox sensitive SRB in coastal zones of Pondicherry region. Reducing conditions in deeper aquifers of Cretaceous and Tertiary formations and availability of Marcasite in these formations may lead to possible arsenic contamination in groundwater. Climate change induced sea level rise and human pollution may exacerbate the nutrient and microbial pollution in this coastal region, and this warrants a detailed investigation so that proper protection strategies for sustainable management of the groundwater resources along the Indian coastal zone can be proposed. |
| Databáze: | OpenAIRE |
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