International Postgraduate Research Conference (IPRC)
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Item Assessments of Drinking Water Quality and Water Treatment Process in Kalatuwawa Reservoir in Sri Lanka.(In: Proceedings of the International Postgraduate Research Conference 2017 (IPRC – 2017), Faculty of Graduate Studies, University of Kelaniya, Sri Lanka., 2017) Premaratne, W.A.P.J.; Senarathne, K.S.D.Kalatuwawa is one of the major water treatment plants which supplies water to Colombo city and it‘s sub-urban. Raw and treated water samples were collected from the Kalatuwawa water treatment plant located at 6 85‘ latitude and 80 18‘ longitude. Both raw and treated water samples were analyzed ninety times within six months (15 days per months) from July to December 2016 for pH, turbidity, conductivity, color, hardness, alkalinity, aluminum, iron, manganese and ammonia. According to the experimental results, pH was in the range of 6.58.5 in the treated water. The conductivity values ranged from 20.5 to 34.5 μS cm- 1 in raw water and it was from 48.5 to 74.5 μS cm- 1 for treated water. The hardness value range was from 5.5 to 6.5 ppm (as CaCO3) for raw water and from 15.5 to 25.5 ppm (as CaCO3) for treated water. Raw water and treated water alkalinities were 7.0-8.5 ppm (as CaCO3) and 13.0-19.5 ppm (as CaCO3) respectively. Aluminum concentration in raw water was 0.02-0.05 ppm and it was 0.1-0.2 ppm in treated water. Ammonia concentration in raw water in Kalatuwawa varied from 0.02 to 0.09 ppm and the maximum value in treated water was 0.01 ppm. Iron concentration in raw water was 0.5-2.0 ppm and it was 0.05-0. 07 ppm in treated water. Average color of the raw water was detected as 39-83 Pt/Co units and after treatment process average color indicated as zero value Pt/Co units. Average turbidity value was from 0.2 to 2.5 NTU for treated water. Experimental data revealed that treated water from Kalatuwawa reservoir is in the limits of World Health Organization (WHO) standards for drinking water parameters indicating efficient, effective and productive water treatment process.Item Physicochemical Analysis of Ground Water Quality and Soil in Ja-Ela Area in Sri Lanka.(In: Proceedings of the International Postgraduate Research Conference 2017 (IPRC – 2017), Faculty of Graduate Studies, University of Kelaniya, Sri Lanka., 2017) Premaratne, W.A.P.J.; Anuruddha, I.G.G.U.Water pollution has become a common problem with the reduction of the availability of drinking fresh water resources. Hydrochemical parameters of groundwater and soil play a significant role in classifying and assessing the water quality. The objective of the present study is to ascertain the major ion chemistry of groundwater and soil in the Ja-Ela, Indiwita area in Sri Lanka. Water and soil samples were collected from 12 drinking water wells between 7 04‘ 29‖ to 7 04‘ 39‖ latitude and 79 53‘ 01‖ to 80 53‘ 04‖ longitude in the JaEla area. Each drinking water well was analysed six times within six months for pH, specific conductance, COD, hardness, and metals (using AAS method) including Al, Fe, Mn, Ca, Mg and Na. The observed physicochemical parameters of ground water were compared with World Health Organization Standards (WHO). According to the experimental results, all the ground water samples were appeared brownish colour with an odour. The observed pH values of all the water samples were ranged from 7.0 to 8.3. Aluminium content in the water samples was not in the detectable limits (<0.05 mg L-1) and the maximum iron content observed was 5.3 mg L-1. The maximum manganese content observed was 0.3 mg L- 1. Total magnesium and calcium contents were ranged from 42 to 581 as CaCO3 mg L-1. The majority water type in the study area was found to be Na-bicarbonate water type. Groundwater soil samples were analysed for pH, specific conductance, cation exchange capacity organic matters, mineral phases, and metals including Al, Fe, Mn, Ca, Mg and Na. Manganese content in soil was from 1.7 to 70.5 mg kg-1. Experimental data revealed that groundwater in studied area was not in the limits of WHO standards for drinking water parameters except the pH value and conductivity.Item Assessment of Water Quality Status and Pollution Levels in Maduru Oya Reservoir in Sri Lanka(Faculty of Graduate Studies, University of Kelaniya, Sri Lanka, 2016) Kasthuriarachchi, T.D.W.; Wickramaarachchi, W.D.N.; Premaratne, W.A.P.J.MaduruOya reservoir was constructed in 1983 under the Accelerated Mahaweli Program. The dam is located in North Central province and the reservoir extends to Eastern province and Uva provinces (between 7º 32' 42" to 7º 39' 57" North latitude and 81º 11' 35" to 81º 12' 21" East longitude). It is reported that high amount of nutrients and other chemical residues accumulate in water of the reservoir due to heavy use of agrochemicals in the catchment area. Fifteen locations were selected for sub-surface water sampling and analysis from February to July in 2016. Temperature, pH, Dissolved Oxygen (DO), Electrical Conductivity (EC) and Turbidity were measured in-situ. Ammonical nitrogen, nitrate nitrogen, nitrite nitrogen, dissolved phosphate, and other chemical parameters such as alkalinity and hardness were also assessed. Water temperature of the reservoir varied from 29.7 ͦ C to 36 ͦ C while pH value was from 6.8 to 9.5. DO value was from 3.3 ppm to 9.4 ppm. EC varied from 94 μS cm-1 to 200 μS cm-1 and turbidity of water fluctuated from 0.96 NTU to 49.4 NTU. Ammonical nitrogen varied from 0.001 ppm to 0.652 ppm. Nitrite Nitrogen was from 0.001 ppm to 0.905 ppm and Nitrate Nitrogen was detected from 0.001 ppm to 1.131 ppm. The highest phosphate concentration was detected as 0.468 ppm near the dam site of the reservoir in July. Total hardness was from 21ppm to 68 ppm and alkalinity varied from 15 ppm to 190 ppm. The highest pH was recorded in June near the dam site of the reservoir and exceed the WHO standards for drinking water. The maximum nitrate and nitrite concentrations were recorded in June at the middle of reservoir and maximum ammoniacal nitrogen was also recorded in June and it was at the dam site. High accumulation of nutrients can lead to eutrophication in the reservoir and it causes the spreading of toxin producing algal species such as Microcystis affecting the ecosystem health and human livelihood.Item Hydrochemical analysis and evaluation of groundwater quality in Rathupaswala area in Sri Lanka(Faculty of Graduate Studies, University of Kelaniya, 2015) Premaratne, W.A.P.J.; Tissera, W.S.L.Water quality analysis is one of the most important aspects in groundwater studies. The physiochemical parameters of groundwater and soil play a significant role in classifying and assessing water quality. The groundwater quality is a function of natural processes as well as anthropogenic activities. The objective of the present work is to ascertain the major ion chemistry of groundwater and soil in Rathupaswala area in Sri Lanka. Water and soil samples were collected from 12 drinking water wells between 7º 02' 25" to 7º 04' 06" North latitude and 80º 00' 043" to 80º 2' 08" East longitude in Rathupaswala area. Each drinking water well was subjected to four times analysis within four months for pH, specific conductance, COD, hardness, and metal ions including Al, Fe, Ca, Mg and Na. The observed physicochemical parameters of ground water were compared with World Health Organization Standards (WHO). According to the experimental results, all the ground water samples appeared colorless, clear and odorless. The observed pH values of all the water samples were ranged from 4.8 to 6.5. Aluminium content in the water samples was not in the detectable limits and the maximum iron content observed was 0.14 mg L-1. Total magnesium and calcium contents were ranged from 4.9 to 29.3 as CaCO3 mgL-1. The majority water type in the study area was found to be Nabicarbonate water type. Groundwater soil samples were analyzed for pH, specific conductance, cation exchange capacity organic matters, mineral phases, and metal irons including Al, Fe, Ca, Mg and Na. Groundwater samples in studied area do not exceed the WHO standards for drinking water parameters except pH value. The recommended pH value was also achieved by boiling process of the ground water. Experimental data revealed that the pH range of groundwater and soil does not greatly influence on the Al, Fe, Ca, Mg and Na content in drinking water in this area.