Environmental Management
Permanent URI for this collectionhttp://repository.kln.ac.lk/handle/123456789/3753
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Item Heavy metal toxicity to bacteria – Are the existing growth media accurate enough to determine heavy metal toxicity?(Chemosphere, 2021, 2021) Rathnayake, I.; Megharaj, M.; Krishnamurti, G; Bolan, N. S.; Naidu, R.A new minimal medium was formulated considering the limitations of the existing media for testing heavy metal sensitivity to bacteria. Toxicity of cadmium and copper to three bacteria was investigated in the new medium and ...Item Green Bond: A new debt instrument for environmental resilient projects(Environmental Monitoring and Management, University of Peradeniya, Sri Lanka, 2021, 2021) Nanayakkara, K.G.M.; Colombage, SisiraItem Sensitivity of freshwater organisms to cadmium and copper at tropical temperature exposures: Derivation of tropical freshwater ecotoxicity thresholds using species sensitivity distribution analysis(Ecotoxicology and Environmental Safety, 2021, 2021) Arambawatta Lekamge, S. H.; Pathiratne, A.; Rathnayake, I.V.N.Tropical freshwater ecosystems are increasingly influenced by chemical stressors including heavy metals posing threats to biodiversity. Adequate ecotoxicity data are not available for native tropical freshwater species for ...Item Green fluorescent protein based whole cell bacterial biosensor for the detection of bioavailable heavy metals in soil environment(Environmental Technology & Innovation, 2021, 2021) Rathnayake, I.; Megharaj, M; Naidu, R.A Green fluorescent protein (GFP) based whole cell bacterial biosensor was prepared using a bacterial strain sensitive to several heavy metals in order to detect bioavailable heavy metals in soils. The transformant, named ...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.Item Felcra paddy estate management decision support system - Part1: Design and development(Journal of Applied Irrigation Science, 2005) Najim, M.M.M.; Haque, M.A.; Lee, T.S.Item Effect of grid subdivision on AGNPS simulations in a tropical watershed, Agricultural Engineering(The Journal of the Agricultural Engineering Society of Sri Lanka, 2004) Najim, M.M.M.Item PWM Expert: An expert system for water management during land preparation in a paddy estate in Malaysia(Tropical Agricultural Research, 2004) Najim, M.M.M.; Aminul, M.H.; Lee, T.S.Item Compliance with Standards and Immerging Issues of Household Sewage Disposal Systems in Gampaha Municipality Area in Western Sri Lanka(Journal of Environmental Professionals Sri Lanka, 2013) Bandara, H.M.K.S.; Najim, M.M.M.Urban centers are highly significant with limited space together with the rising urban population. Most of the houses and buildings are attached with some kind of a sewage disposal facility as central sewage disposal systems are limited. Urbanization is expected to create many problems in terms of black water disposal due to limitation of land. A study was done in Gampaha municipality area, an urban center, where there is no central sewage treatment facility. The objectives of the study were to analyze the current situation of the black water disposal system in the study area and to identify the shortcomings of the black water disposal system comparing with the standards. The study was conducted within the urban center in five GN divisions. Random samples of 44 households were selected to represent all the five GN divisions. Selected households were interviewed to collect basic data needed and physical measurements were also taken where necessary. The data categories collected are household information, toilet type and size, desludging interval and distance to nearest well. The code of practice for the design and construction of septic tanks reports that 80% of urban communities use septic tanks for sewage disposal, but this study reveals that only 18% of the population uses septic tanks. Over 82% uses typical soakage pits that are constructed with loosely constructed brick walls and bare bottom open to soil for their sewage disposal. Over 68% of the households have their toilet pits within 15m to the nearest well, which is below the recommended distance. Only 30% of the households comply with over 15m to the nearest well that is recommended for septic tanks. The recommended distance for the soakage pits to the nearest well is 30m and only 9% of the households meet this standard. The black water disposal pits are over sized in general, so that the desludging interval is more than 10 years. Recently constructed houses, due to limitation of space, have reduced the size of the pits reducing the size of desludging interval. The construction and placement of septic tanks or soakage pits in the area have not complied with the standards.