Influence of Geo-Environmental and Chemical Factors on Thermotolerant Coliforms and <I>E.coli</I> in the Groundwater of Central Kerala
Authors
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School of Environmental Studies, Cochin University of Science and Technology, Main Campus, Thrikakkara, Cochin - 682 022
M. S. Sreekala -
Department of Biotechnology, Union Christian College, Aluva, Affiliated to Mahatma Gandhi University, Kottayam
Sareen Sarah John
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School of Environmental Studies, Cochin University of Science and Technology, Main Campus, Thrikakkara, Cochin - 682 022
Rajathi Sivalingam
DOI:
https://doi.org/10.1007/s12594-018-0913-yAbstract
Geo-environmental studies in parts of Ernakulam district (Kerala, India) were carried out. The study area comprises of sedimentary (Limestone, sandstone, Clay and Lignite) and crystalline (Charnockite and gneisses) rocks. The sedimentary terrain is characterized by confined and unconfined aquifers. In hard crystalline formations groundwater occurs under phreatic conditions in the shallow weathered portions and under semi confined to confined conditions in the deep-seated fractures. The study area is demarcated into five areas based on soil types. Climate is hot humid to hot summer with heavily raining monsoon. Two major rivers Periyar and Muvattupuzha drain through the area. Agricultural and industrial activities are prevalent in Ernakulam district. The major cause of pollution in the study area is due to the presence of coliforms. Detailed investigations carried out to identify the coliforms indicated spatial and seasonal changes in the distribution pattern. Monsoon and post monsoon showed significantly high total coliforms compared to pre-monsoon. Thermo-tolerant coliforms is high during monsoon season. This seasonal change could be due to the effect of rainfall, overland flow, nutrient load and temperature change. Wide variations in the coliform counts are observed in wells situated near rivers, canals, paddy fields and in water bodies lying close to pilgrimage center, fertilizer industry, and public places. It is noticed that the chemical characteristics of the groundwater influence the coliform survival. pH, nitrite, bicarbonate, hardness, and alkalinity play a significant role in controlling coliform count. At the outset, the study highlighted the impact of anthropogenic activities on ground water in a coastal district of Kerala state.
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