http://drw.jfn.ac.lk/handle/123456789/10 2026-05-11T06:00:15Z 2026-05-11T06:00:15Z Pupulewatte, P. G. H. Dissanayake, N. U. S. Jayawardana, D. T. Gunathilake, B. M. Buddhima, A. V. P. S. http://drw.jfn.ac.lk/handle/123456789/416 2024-03-27T15:48:46Z 2023-01-01T00:00:00Z

Development of characteristics of laterite soil-based mixtures for the removal of nitrate from drinking water. Pupulewatte, P. G. H.; Dissanayake, N. U. S.; Jayawardana, D. T.; Gunathilake, B. M.; Buddhima, A. V. P. S. The main objective of this study is to investigate surface adsorption characteristics and physical conditions of laterite for the removal of nitrate in aqueous solutions with the appropriate amendment for the effective removal of nitrate from drinking water. The physico-chemical properties of laterite soil were analyzed. The effects of various operational parameters such as solution pH, adsorbent dosage, contact time, and the initial concentration of nitrate were examined on nitrate adsorption by laterite and laterite-limestone soil mixtures using the batch experiments. The obtained results showed that the maximum percentage of nitrate adsorption attained by raw laterite was at initial pH 3, after 60 min of contact time, and with an adsorbent dose of 2 g. Pseudo-first-order kinetic model and Langmuir isotherm model showed the best fit for the experimental adsorption data, and a maximum adsorption capacity of 0.628 mg/g was observed. Laterite-limestone mixture containing 60% laterite showed the highest removal efficiency. The results obtained by the limestone-laterite mixture showed that the maximum removal efficiency attained was at pH 3, after 180 min of contact time, and with an adsorbent dose of 2 g. Although the optimum pH was similar in both soil samples, the final pH of the solution had increased to 6.75±0.17. Pseudo-second-order kinetic model and Freundlich isotherm model showed the best fit for the experimental adsorption data. This soil mixture was used to determine the effect of competing anions on the nitrate removal efficiency. It was found that phosphate ions have shown maximum influence.

2023-01-01T00:00:00Z Nirojan, K. Ketheesan, B. Herath, G.B.B. Sivakumar, S.S. http://drw.jfn.ac.lk/handle/123456789/241 2023-08-11T15:10:32Z 2018-01-01T00:00:00Z

Sorption technique for treating brackish groundwater in Jaffna Peninsula. Nirojan, K.; Ketheesan, B.; Herath, G.B.B.; Sivakumar, S.S. The Jaffna Peninsula is situated in the northern extreme of Sri Lanka and it approximately covers an area of 1,023 square kilometers (km2). Presently sea water intrusion to groundwater aquifers is of major challenge in Jaffna peninsula and the salinity intrusion led to elevated level of total dissolved solids (TDS) and electrical conductivity (EC) in the groundwater.It is apparent that the high energy intensive membrane processes are commonly applied to treat brackish groundwater. Unfortunately, this is a selective process according to the pore size of membrane. The most reasonable perception for the removal of sodium chloride in the drinking water system based on the sorption water treatment. The foremost purpose of the present studie is in the direction of using clay for treating brackish groundwater using sorption techniques. In this study, clay which contain naturally available Montmorillonite was collected from Murunkan area in Mannar. The collected clay samples were experienced through characterizations method including Linear shrinkage test, Particle size analysis (PSA), X-Ray Fluorescent (XRF) and Fourier transform infrared spectroscopy (FTIR), etc.Further, other analytical methods such as Differential thermal analysis (DTA), Thermal gravimetric analysis (TGA), X‐ray diffraction (XRD), and Zeta potential will be carried out to characterize the clay sample. And also, the collected brackish ground water sample, at Point Pedro in Jaffna, are going to be characterize the water quality parameter such as concentration of sodium, potassium, calcium, magnesium, chloride, fluoride and pH. Consequently, the sorption treatment will be carried using different treatment techniques in the batch treatment and column treatment processes.

2018-01-01T00:00:00Z Thabojanan, T. Thushyanthy, M. Saravanan, S. Senthilnanthanan, M. Eswaramohan, T. Gajapathy, K. Surendran, S.N. http://drw.jfn.ac.lk/handle/123456789/214 2022-03-29T15:52:32Z 2019-01-01T00:00:00Z

Investigation of electrocoagulation reactor design parameters effect on removing hardness from drinking water using iron electrodes. Thabojanan, T.; Thushyanthy, M.; Saravanan, S.; Senthilnanthanan, M.; Eswaramohan, T.; Gajapathy, K.; Surendran, S.N. In this work, the hardness removal efficiency was studied from groundwater taken Jaffna peninsula which was used to drinking. Electrochemical cell was constructed using six-iron electrodes. The electrodes were connected to a power supply that provides direct electrical current to the cell. Results showed that removal efficiency of 85% can be obtained at alkaline medium and electrical voltage of 20 volt with retention time of 60 minutes. The high efficiency for hardness removal suggested that the electrochemical technique might be used as an alternative technique for hardness removal.

2019-01-01T00:00:00Z Nishanthiny, S.C. Thushyanthy, M. Barathithasan, T. Saravanan, S. http://drw.jfn.ac.lk/handle/123456789/113 2021-06-18T12:26:10Z 2010-01-01T00:00:00Z

Irrigation Water Quality Based on Hydro Chemical Analysis, Jaffna, Sri Lanka Nishanthiny, S.C.; Thushyanthy, M.; Barathithasan, T.; Saravanan, S. The hydro chemical study reveals the quality of water and its suitability for drinking, agriculture and industrial purposes. Presence of excessive quantities of salts in groundwater is one of the major constrains in agro-well farming in Jaffna Peninsula. Irrigation with poor quality waters may bring undesirable elements to the soil in excessive quantities affecting its fertility. Electrical conductivity (EC), Sodium percentage (Na %), Sodium adsorption ratio (SAR), Residual sodium carbonate (RSC) can be used as a criterion for finding the suitability of irrigation waters. The objective of this study is to evaluate the suitability of the irrigation water quality of the Jaffna Peninsula. Major cations; Na+, Ca2+, Mg2+, K+ and major anions; Cl-, SO 2-, HCO -, CO 2-, 4 3 3 were determined from 34 wells, randomly located in Peninsula from October 2008 to April 2009 to assess the hazards of salinity, sodium and bicarbonate. Out of selected wells, based on EC, 44% of the wells have medium salinity water, 47 % of the wells have high salinity water and 9 % of the wells have very high salinity water. Based on percent of sodium, 3% of the wells have excellent irrigation water quality, 18 % of the wells have good irrigation water quality, 44% of the wells have permissible irrigation water quality, 32% of the wells have doubtful irrigation water quality and 3% of the wells have unsuitable irrigation water quality. Based on SAR, almost all the wells have the good quality irrigation water. Based on RSC, 61% of the wells have good irrigation water quality, 15% of the wells have doubtful irrigation water quality and 24% of the wells have unsuitable irrigation water quality. In overall assessment of tested wells, 20.6% of the wells have good quality water for irrigation, 44.1% of the wells have permissible to doubtful irrigation water quality, 35.3% of the wells have unsuitable irrigation water quality, in which bicarbonate hazard was identified as major hazard which is due to the influence of carbonate rock dissolution.

2010-01-01T00:00:00Z