K.B.S.N. Jinadasa

University of Peradeniya

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S. K. Weragoda

Ministry of Water Resources and Irrigation

Yuansong Wei

Research Center for Eco-Environmental Sciences

Rohan Weerasooriya

National Institute of Fundamental Studies

M. I. M. Mowjood

University of Peradeniya

Norio Tanaka

Saitama University

Wun Jern Ng

Nanyang Technological University

Tharindu Ritigala

Research Center for Eco-Environmental Sciences

Suresh Indika

University of Peradeniya

Madhubhashini Makehelwala

Ministry OF City Planning and Water Supply

Nadeeshani Nanayakkara

University of Peradeniya

Cooperative Institutions

University of Peradeniya

Chinese Academy of Sciences

University of Chinese Academy of Sciences

Research Center for Eco-Environmental Sciences

State Key Joint Laboratory of Environment Simulation and Pollution Control

Nanyang Technological University

National Institute of Fundamental Studies

Saitama University

Ministry OF City Planning and Water Supply

New South Wales Department of Primary Industries

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Enhanced Pretreatment of Natural Rubber Industrial Wastewater Using Magnetic Seed Coagulation with Ca(OH)2

Water (2024)

Ishanka Prabhath Wimalaweera Yuansong Wei Tharindu Ritigala Yawei Wang Hui Zhong

The efficiency of magnetic seed coagulation (MSC) with pH adjustment by NaOH and Ca(OH)2 as a pretreatment for high-strength natural rubber industrial wastewater (NRIWW) was compared in this study. The high content of suspended solids (SSs) and other inhibitory substances of NRIWW is a primary issue which affects its subsequent secondary and tertiary treatment processes. The MSC process with polyaluminum chloride (PAC), anionic polymer (polyacrylamide—PAM)), and magnetic seeds (MS) (ferric oxide (Fe3O4)) was proven to be a cost-effective pretreatment of NRIWW, and Ca(OH)2 showed improved pretreatment performance, with turbidity, COD, and TSS removals of 95%, 56%, and 64%, respectively. Sedimentation was enhanced from 30 min by conventional coagulation to less than 5 min by the MSC. The organic components of NRIWW reacted with MS to generate Fe–OH/Fe–OH+ linkages through processes of surface complexing and hydrogen bonding. According to fractal analysis, the MSC process optimized with Ca(OH)2 produces less complex flocs that are uniform and densely packed. Additionally, MS served as an adsorbent and promoted the development of magnetic flocs by boosting their density and size. MSC with pH adjustment by Ca(OH)2 presents a robust and cost-effective pretreatment process for NRIWW.

10.3390/w16060847

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Citations (3)

Contents: Clean Soil Air Water. 8/2016

CLEAN - Soil Air Water (2016)

G.M.P.R. Weerakoon K.B.S.N. Jinadasa Gemunu Herath M. I. M. Mowjood D Zhang

Acrostichum aureum and Alstonia scholaris cassava beads immobilized with Pseudomonas putida show good benzene removal potential.Parameters affecting benzene removal by these plant leaves immobilized with P. putida are analyzed.The result suggest that 1.2-1.5 min of retention time with an enrichment medium is the best condition for 55 ppm of benzene removal. Application of Pseudomonas putida TISTR152 Immobilized on Plant Leaves for Benzene Adsorption

10.1002/clen.201670081

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Adsorption of fluoride on goethite surfaces-implications on dental epidemiology

Environmental geology and water sciences (1993)

K.B.S.N. Jinadasa C.B. Dissanayake S. V. R. Weerasooriya A. Senaratne

Fluoride ion interaction with synthetically prepared goethite has been investigated over a range of pH values (4–9) and F− concentrations (10−3−10−5 M). The amount of F− retained by goethite suspensions was found to be a function of pH, media ionic strength, F− concentration, and goethite concentration. The lowest ionic strength (0.001 M KNO3) gave the highest adsorption medium. Uptake was minimal at pH >7 and increased with decreasing pH. Thermodynamic properties for fluoride adsorption at 298 K and 323 K were investigated. The isosteric heat of adsorption (δH r) was calculated and the heterogeneity and homogeneity of the surface examined for goethite. In view of the importance of fluoride in dental health, the interaction of fluoride on goethite in the physical environment has important implications on dental epidemiology.

10.1007/bf00775915

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Citations (11)

FRONT MATTER

Norio Tanaka Wun Jern Ng K.B.S.N. Jinadasa

10.1142/9781848162983_fmatter

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Wetlands for the Treatment of Agricultural Drainage Water

MDPI eBooks (2018)

Guangzhi Sun Evelyn Uuemaa Chris Palliser Andrew O. Hughes Chris C. Tanner

Agricultural drainage, such as runoffs from farmlands and wineries, are contaminated waters. Their management is monitored by environmental protection authorities who set targets of volume or pollutant reductions. Due to large quantities and seasonal variations, the targets are often not met, and effective management remains a problem in many parts of the world.Natural wetlands are known as the 'kidneys' of the earth with unique water purification functions that have long been recognized. Imitating the functions of natural wetlands, constructed wetlands are engineered systems purposely built to treat contaminated waters. They may therefore be called the 'artificial kidneys' of the earth. Rural areas often only have low-value lands available for constructed wetlands. Where large quantities of drainage are produced, farmlands are often adjacent to degraded natural wetlands that have reduced ecosystem functions. Controlled discharge and treatment in the wetlands can potentially be part of an integrated solution to multiple environmental problems.This book includes some recent studies on the fate of pollutants removed from agricultural drainage in wetlands, modelling of wetland performance, innovative systems, and the use of non-hazardous agricultural waste in constructed wetlands for wastewater treatment. These studies enhance our understanding of wetland systems, and will help develop wetland technology towards solving the problems associated with agricultural drainage.

Drainage system (geomorphology)

10.3390/books978-3-03897-209-9

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Citations (1)

Paddy Field and Constructed Wetland: The Equivalencies

Springer eBooks (2020)

M. I. M. Mowjood K.B.S.N. Jinadasa B. F. A. Basnayake

Ecological engineering

10.1007/978-981-15-3673-1_9

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Citations (2)

Catchment based estimation of pollutant event mean concentration (EMC) and implications for first flush assessment

Journal of Environmental Management (2020)

Thamali Perera James McGree Prasanna Egodawatta K.B.S.N. Jinadasa Ashantha Goonetilleke

10.1016/j.jenvman.2020.111737

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Citations (26)

Groundwater-Based Drinking Water Supply in Sri Lanka: Status and Perspectives

Water (2022)

Suresh Indika Yuansong Wei Titus Cooray Tharindu Ritigala K.B.S.N. Jinadasa

Drinking water is largely from groundwater in Sri Lanka, so quality management is of great concern. In order to achieve the 6th goal of United Nations (UN) Sustainable Development Goals (SDG), more efforts are being undertaken to secure drinking water quality. In this paper, the current status, challenges and opportunities of groundwater quality management and improvement in Sri Lanka were reviewed and discussed, based on previous studies. There are Ca-HCO3 type, Ca–Mg-HCO3 type and Na–SO4–Cl type groundwater dominated in the wet zone, intermediate and the dry zone, respectively. Elevated levels of hardness, fluoride, DOC, and alkalinity, and salinity are reported in the groundwater in the dry zone controlled by geology and arid climate. Although groundwater in some regions contain significant levels of nitrates, arsenic, cadmium and lead, the majority remain at acceptable levels for drinking purposes. As for treatment technologies, existing membrane-based drinking water treatment technologies such as RO (Reverse Osmosis) stations can produce safe and clean drinking water to the community, but this has still a limited coverage. To achieve a safe drinking water supply for all, especially in rural communities of Sri Lanka under the 6th goal of the UN SDG, more efforts in building up the infrastructure and man power are needed to monitor and assess groundwater quality regularly so as to develop management strategies. Research and development can be directed towards more cost-effective water treatment technologies. Protection of groundwater from being polluted, and educational and awareness programs for the stakeholders are also essential tasks in the future.

10.3390/w14091428

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Citations (23)

Fouling of ion exchange membranes used in the electrodialysis reversal advanced water treatment: A review

Chemosphere (2020)

M.A.C.K. Hansima Madhubhashini Makehelwala K.B.S.N. Jinadasa Yuansong Wei Nadeeshani Nanayakkara

Ion Exchange Membranes

Membrane Technology

10.1016/j.chemosphere.2020.127951

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Citations (112)

Integrated mathematical model to simulate the performance of a membrane bioreactor