PhD Research Studies

Two PhD research study commenced in CAS under the supervision by Prof Yuansong Wei on organic and inorganic contaminants in groundwater in Year 2016.

  • Field investigations on groundwater pollution in CKDu prevalent areas in Sri Lanka.
  • Construction and Installation of a drinking water station using Nanofiltration based on results from water quality investigation and laboratory tests for membrane selection.

Field investigations on groundwater pollution in CKDu prevalent areas in Sri Lanka 


Madhubhashini Makehelwala PhD candidate of University of Chinese Academy of Sciences, Beijing successfully completed her PhD study in Environmental Engineering on June 2019. In this study, seasonal variation of ground water quality of three selected CKDu risk areas as high risk (HR), low risk (LR), no risk (NR) and control zone (CR) in Sri Lanka was investigated. Characterization of the groundwater dissolved organic carbon (DOC) in different CKDu risk zones and the interactions between calcium and sulfate were also investigated. Advanced analytical techniques as size exclusion chromatography (HPLC-SEC) for DOC molecular weight identification, fluorescence spectroscopy for DOC fractionation, XPS for surface elemental percentage of DOC (C, N, O) and boding energy, FTIR for bonding behavior identification were used. The findings from DOC and calcium, sulfate interactions were applied in the identification of nano-filtration membrane fouling mechanism. The Nano-filtration technology was employed in improving safe drinking water supply in the CKDu affected areas of the North Central Province of Sri Lanka.

All the financial support was given by the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences under the joint research program of National Natural Science Foundation (NSFC-NSFSL, 21861142020). The PhD fellowship support was given by CAS-TWAS presidential fellowship (2015-2019). The sample collection was done with laboratory staff of China-Sri Lanka Research Grant Project/Water Safety Plan Advisory Unit, National Water Supply and Drainage Board, Katugastota, Sri Lanka. Support was given by the staff of Ministry of health for collection of information

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