Browsing by Author "Rajapakshe, I.H."
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Item Health implications related to mismanagement of domestic and municipal wastewater in Sri Lanka.(Sage Publishers, India., 2011) Najim, M.M.M.; Rajapakshe, I.H.TRADITIONALLY IN SRI LANKAN villages domestic wastewater, especially grey-water generated from kitchens and bathrooms of a household, fl ows along open unlined wastewater drains and is collected in a garden pool known as kohila wala or vegetation pool. This pool is a kind of traditionally constructed wetland. Main vegetation type cultivated in the wetland is kohila (Lasia spinosa) which is used as a leafy and stem vegetable. Medicinal and other important plants are also grown along the drains that utilise the wastewater and its nutrients. This system of grey-water disposal and utilisation was always kept separate from the black-water disposal system as the latter is disposed to individual cesspits located in home gardens. In the traditional sys tem, natural capacity to treat wastewater without any harmful effects to groundwater was possible due to low population density and land availability. With the population expansion in urban centres, the land value increased and land area available for the traditional wastewater treatment process shrank.Item Microbial water quality variations in consumable water sources and pollution contributions by Pussalla Oya Catchment Communities(Tropical Agricultural Research, 2008) Rajapakshe, I.H.; Galagedara, L.W.; Najim, M.M.M.Item Microbial water quality variations in different water sources in the Pussalla Oya catchment and pollution contributions by communities(Tropical Agricultural Research, 2008) Najim, M.M.M.; Galagedara, L.W.; Rajapakshe, I.H.Natural water sources in Pussalla Oya catchment are prone to faecal pollution and it was reflected by Hepatitis A outbreak in May 2007. Although the faecal pollution is a common problem in the catchment, pollution contribution and severity could vary among the communities. A study was conducted to compare the water related issues among different communities in the Pussalla Oya catchment, assessing the variations in water quality and pollution contributions. Communities selected were Rothschild estate, Pussallawa town and Black Forest colony to represent estate, peri-urban town and village, respectively. Water quality analysis (total Coliform and Escherichia coli), questionnaire survey and field observations through transect walks were conducted to find the disparity in water quality and pollution contributors. Main consumptive water sources in all three communities exceeded the Sri Lankan drinking water quality standards. Higher E. coli count is found in wells closer to Rothschild estate dwellings and Black Forest colony reflecting potential groundwater contamination. Quality of consumptive water sources has statistically significant differences between dry and wet seasons in all communities. Comparatively higher pollution levels have been found at the outflow points in Pussallawa town due to unavailability of onsite wastewater treatment facilities and mismanagement of wastewater. The onsite wastewater treatments are not possible with respect to limited land availability and shallow groundwater levels. But the groundwater quality in Pussallawa town is comparatively better.Item Problems Associated with Utilization and Management of Wastewater: A Case Study from Sri Lanka(A Case Study from Sri Lanka, 2007) Rajapakshe, I.H.; Gunawardana, I.P.P.; Najim, M.M.M.Item Water and Nutrient Balance in a Paddy Field Irrigated by Wastewater During Off (Yala) Season in Kurunegala, Sri Lanka(Journal of Applied Irrigation Science, 2007) Rajapakshe, I.H.; Najim, M.M.M.