Sulphate removal by nanofiltration from water

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2010
Karabacak, Aslı
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Excess sulphate in drinking water poses a problem due to adverse effects on human health and also due to aesthetic reasons. This study examines the nanofiltration (NF) of sulphate in surface water using a laboratory cross-flow device in total recycle mode. In the study, three NF membranes, namely DK-NF, DL-NF and NF-270, are used. The influence of the main operating conditions (transmembrane pressure, tangential velocity and membrane type) on the steady-state permeates fluxes and the retention of sulphate are evaluated. Kızılırmak River water is used as the raw water sample. During the experimental studies, the performance of NF is assessed in terms of the parameters of UVA254, sulphate, TOC and conductivity of the feed and permeates waters. Results indicated that NF could reduce sulphate levels in the surface water to a level below the guideline values, with a removal efficiency of around 98% with all three membranes. DK-NF and NF-270 membranes showed fouling when the surface water was fed directly to the system without any pre-treatment. MF was found to be an effective pretreatment option for the prevention of the membrane fouling, but no further removal of sulphate was achieved. Parametric study was also conducted. No change in flux values and in the removal of sulphate was observed when the crossflow velocity was lowered. The flux values were decreased as the transmembrane pressure was lowered; however there were not any decrease in the sulphate removal efficiency.
Nanofiltration., Sulphides, Drinking water.
http://etd.lib.metu.edu.tr/upload/12612748/index.pdf
https://hdl.handle.net/11511/20178
Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats
A. Karabacak, “Sulphate removal by nanofiltration from water,” M.S. - Master of Science, Middle East Technical University, 2010.
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