http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/77 2026-04-04T01:55:54Z 2026-04-04T01:55:54Z Mathara Arachchi, M.A.O.D Sukanyah, S. http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/2296 2022-10-21T06:47:36Z 2020-01-01T00:00:00Z

Public acceptability of treated surface water for portable purpose: Case study in Vavuniya Mathara Arachchi, M.A.O.D; Sukanyah, S. The low public acceptance is one of the major challenges in implementing and succeeding surface water intake projects for potable purpose. The water treated from Per-Aru reservoir is the source of water supplied by the National Water Supply and Drainage Board (NWSDB) for some parts of Vavuniya district. The low public demand towards the use of treated water is one of the obstacles faced by the NWSDB in operating the plant. Thus, the objective of this study was to assess the public acceptability towards the use of Per-Aru treated water for potable purposes in Marakarampalai area located in North-west part of Vavuniya. This study area was selected as it purely receives treated water from Per-Aru Water Treatment Plant for water supply. Questionnaire survey was conducted between two groups of sample population; beneficiaries (those who have NWSDB water connection, n = 40), and non-beneficiaries (those who do not have NWSDB water connection, n = 40) in Marakarampalai area. The questions were focused to assess the satisfaction towards the treated water among the beneficiaries and to assess the willingness/constraints to obtain water supply among non-beneficiaries. Results showed that half of the beneficiaries use the treated water for potable purposes as they are aware of the periodic water quality checkups. However, the rest only uses for non-potable purposes as they do not trust the quality of water for potable purposes. More than half of the beneficiaries obtained the water supply connection mainly to get rid of water shortage issues in dry season. It was noticed that the people those who have access to alternative water sources are not willing to get water connection paying extra bills. For non-beneficiaries, financial constraints and lack of awareness are the major factors to get the water connection. The provision of financial benefits and environmental education programmes by the NWSDB can be encouraged to enhance the public demands towards the use of treated water.

2020-01-01T00:00:00Z Sukanyah, S. Vigneswaran, S. Nguyen, T.V. Loganathan, P. Kandasamy, J http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/2295 2022-10-21T06:47:36Z 2015-01-01T00:00:00Z

Use of nanofiltration and reverse osmosis in reclaiming micro-filtered biologically treated sewage effluent for irrigation Sukanyah, S.; Vigneswaran, S.; Nguyen, T.V.; Loganathan, P.; Kandasamy, J Micro-filtered, biologically treated sewage effluent (BTSE) generally has high sodiumadsorption ratio (SAR) and sodium(Na) and chloride (Cl) concentrations. Therefore it cannot be directly used for irrigating sensitive crops. A study was conducted on a micro-filtered BTSE from a Sydney water treatment plant to determine whether the BTSE can be treated using nanofiltration (NF) and reverse osmosis (RO) to bring these risk parameters within safety limits. The study showed that using NF and RO alone could not produce the required ratio of SAR. Furthermore, NF alone did not remove the necessary levels of Na and Cl ionswhile RO did. However, blending equal proportions of NF permeate and RO permeate obtained from a two stages hybrid treatment system consisting of NF followed by RO resulted in a product quality suitable for irrigation in terms of the above mentioned risk factors. Utilizing NF prior to RO reduced the RO membrane fouling aswell. Both NF and RO removedmost of the pharmaceutical and personal care products fromthe feedwater and this may subsequently protect soil and groundwater from potential hazards.

2015-01-01T00:00:00Z Sukanyah, S. Nguyen, T.V. Jeong, S. Kandasamy, J http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/2294 2022-10-21T06:47:36Z 2015-01-01T00:00:00Z

Submerged membrane – (GAC) adsorption hybrid system in reverse osmosis concentrate treatment Sukanyah, S.; Nguyen, T.V.; Jeong, S.; Kandasamy, J Wastewater reclamation plants using reverse osmosis as the final polishing treatment produce reverse osmosis concentrate (ROC), which consists of high salinity, nutrients and (recalcitrant) organics. The ROC collected from the water reclamation plant in Sydney was treated with a micro filtration (MF)–GAC hybrid system that removed natural and synthetic organics prior to its discharge into the environment. The MF–GAC hybrid system’s performance was studied in terms of trans-membrane pressure (TMP) development, and organics removal. These features were measured using liquid chromatography–organic carbon detection (LC–OCD), Fluorescence Excitation-Emission matrix (F-EEM), and Liquid chromatography with tandem mass spectroscopy (LC–MS). Adding GAC into the membrane reactor reduced the TMP by reducing membrane fouling both through mechanical scouring and pre-adsorption of organics. F-EEM confirms the removal of humics-like and fulvic-like compounds by GAC from ROC. Pharmaceuticals and personal care products (PPCPs) were also removed by the MF–GAC hybrid system.

2015-01-01T00:00:00Z Sukanyah, S. Loganathan, P. Kazner, C. Johir, M.A.H. Vigneswaran, S. http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/2293 2022-10-21T06:47:35Z 2017-01-01T00:00:00Z

Submerged membrane filtration adsorption hybrid system for the removal of organic micropollutants from a water reclamation plant reverse osmosis concentrate Sukanyah, S.; Loganathan, P.; Kazner, C.; Johir, M.A.H.; Vigneswaran, S. Reverse osmosis (RO) is awidespreadwater treatment process utilised in water reuse applications.However, the improper discharge of RO concentrate (ROC) containing organic micropollutants such as pharmaceuticals into the environment may cause potential health risks to non-target species and particularly those in aquatic environments. A study was conducted using a submergedmembrane-filtration/granular activated carbon (GAC) adsorption hybrid system to remove organicmicropollutants from a water treatment plant ROC by initially adding 10 g GAC /L of membrane reactor volume with 10% daily GAC replacement. The percentage of dissolved organic carbon removal varied from 60% to 80% over an operation lasting 10 days. Removal of organic micropollutants was almost complete for virtually all compounds. Of the 19 micropollutants tested, only two remained (the less hydrophobic DEET 27 ng/L and the hydrophilic sulfamethoxazole 35 ng/L) below 80% removal on day 1, while five of the most hydrophobic micropollutants were detectable in very small concentrations (b5–10 ng/L) with N89%–N99% being removed. High percentages of micropollutants were removed probably because of their high hydrophobicity or they had positive or neutral charges and therefore they were electrostatically adsorbed to the negatively charged GAC.

2017-01-01T00:00:00Z