Environmental Management
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Item In depth analysis of groundwater quality and use of Moringa oleifera leaf powder treatment to improve physico-chemical properties and drinkability of contaminated groundwater(Environmental Nanotechnology, Monitoring & Management, 2019) Wijeyaratne, W. M. D. N.; Suvendran, S.Groundwater is the major source for domestic, and other uses in the Jaffna Peninsula, Sri Lanka. This study assessed the spatial and seasonal variation of physical and chemical parameters of water collected from domestic wells in Chunnakam and Vadamaradchi aquifers. The measured physicochemical parameters were compared with the drinking water standards established by Sri Lanka Standards Institution. Significant spatial variations in the water quality parameters were identified in both areas. Significantly elevated levels of nitrate and oil & grease were identified in Chunnakam, whereas significantly elevated levels of DO and pH were recorded in Vadamaradchi. Nitrate concentration of the wells ranged between 0.021–40.1 mg/ L. Oil & grease of these wells ranged from 0.011 to 0.373 mg/L. In Chunnakam, 60% of sampled wells had nitrate level above the permitted nitrate standard level, and all the wells had elevated oil and grease concentration above the permitted standard limit. Filtration of water through Moringa oleifera leaf powder could significantly reduce the nitrate an oil and grease concentrations, thereby improving the quality of water.Item Biological remedies towards safe water...(Proceedings of the Twenty Fourth Scientific Sessions of the Sri Lanka Association for Fisheries and Aquatic Resources, 2018) Wijeyaratne, W.M.D.N.Water is considered as the most essential component in the human livelihood. Rapidly increasing world population, mainly in the developing countries in parts of Asia, North Africa and the Middle East, and sub-Saharan Africa have placed an inordinate demand on safe drinking and potable water. This ever increasing water demand have exceeded the avaiiabie suppiy oi safe fresh water in many regions oi the world. Some major river basins in Asia, North Africa and Middle East are facing severe water scarcity, and over extraction of ground water resources has become a growing problem in many parts of the world. The water scarcity problems are further intensified by increased water pollution due to point and non-point source inputs from urban, industrial and agricultural sectors. Water pollution has imposed severe health issues on human populations and ecological health impairments in aquatic ecosystems. Ensuring universal access to affordable and safe drinking water by 2030 is a target in one of the sustainable development goals. Therefore, the national and international efforts are being initiated to improve water purification infrastructure, provide proper •sanitation facilities, and encourage hygiene in rural, urban and sub urban communities. In addition, the importance of protection and restoration of water- related ecosystems such as forests, mountains, wetlands and riversäs identified in- order to mitigate water scarcity. However, the costs of treating polluted water and restoring water bodies has become a major concern in many countries. The cost of water treatment and aquatic ecosystem restoration requires investment of large amounts of funds and labor, which is unbearable by most of the developing and technology lagging countries. Therefore, natural and synthetic remediation methods have been studied to improve the quality of the contaminated water in many parts of the world, Compared to the chemical purification methods, use of natural materials is increasingly popular among many research groups as these methods provide more cost-effective, environmentally friendly alternatives of water purification. Biological water purification methodologies can be in treatment of domestic drinking water as well as for treating waste water before releasing thém to the environment. Many traditional water purification methodologies that have in practice for decades have been improved and modified by recent research findings to cater for wider community in need of purified water. Further, Many research have been to identify effective plant and microbial aggregations that can serve as universal communities in constructed wetlands in terms of remediation of heavy metal, suspended solids and nutrient pollution. treatment increasing'} researched 2nd as they can destroy and remove multiple contaminants simultaneously and have minimum sludge production and bacterial regrowth. Biological treatment can be used to remove natural organic matter, cclour, chloroform, perchlorate, nitrate, nitrite, bromate, iron, manganese, chromate, arsenate, and a variety of other contaminants cf polluted y.'2ter . cy.id2ticn prier to filtraticn cr settling, as wetl as the need for chemical reduction methods, and produces innocuous end-products, thus reducing the risk Of a contaminating the natural aquatic systems. Therefore, to achieve the sustainable development goal of ensuring availability and sustainable management of water and sanitation for all by 2030, the importance of the role of living organisms in water purification needs to be given a top priority as life and water is the driving force towards a sustainable future.