Removal of NOMs and Microcystin-LR by NF Membrane
Date Issued
2008
Date
2008
Author(s)
Sheng, You-Ding
Abstract
In recent years, membrane filtration has been considered as an advanced water treatment technology, able to provide drinking water to meet stringent drinking water regulations. Membrane processes are often chosen to achieve a high removal of micropollutants and NOMs.s a result, the purposes of this study include: (1) the investigation of the removal efficiencies and mechanisms of NOMs and Microcystin-LR by the ultra-filtration (UF) and nano-filtration(NF) membranes, and (2) the control of trihalomethane formation potential (THMFP) in Tai-Lake source water through the membrane process.he results of this research work indicate that the hydrophobic substances exhibit higher aromaticity of NOMs than the hydrophilic substances because of their higher UV254 and SUVA values. For the hydrophobic substance, the DOC removal efficiency was over 96% and residual DOC concentration was very low (below 0.2 ppm). The UV (254 nm) absorbance reductions rejection ratio was 80~85% for hydrophilic substances and 95~98% the hydrophobic at various operating pressures. he hydrophilic substance caused a higher fouling potential than the hydrophobic substance over the 24 hour operation. From the GFC diagram, both the hydrophilic and hydrophobic water samples (fractionated form DAX-8 resin) could not be removed by the NF membrane process completely because the diffusion of low concentration DOC with a low molecular weight distribution(350~500 Da).he tendency for removal of microcystin-LR (MC-LR) was similar to that of NOMs rejection (i.e. the higher pressure operation reveals better removal efficiency). The high correlation coefficients in the cake deposit model, the pore blocking model and adsorption model suggest that the three mechanisms should cause fouling in membrane process.
Subjects
Natural organic matters (NOMs)
ultra-filtration (UF)
nano-filtration (NF)
THM formation potential (THMFP)
hydrophilic substance
hydrophobic substance
microcystin-LR (MC-LR)
SDGs
Type
thesis
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