Colloidal fouling and scaling in reverse osmosis process

Water is crucial and essential for life. Despite having majority of the earth surface covered by water, accessing safe water source is an increasing challenge faced by human population. Hence, recycling used water and converting non-potable water to potable are the options being adopted in alleviati...

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Main Author: Jun, Yan
Other Authors: Chong Tzyy Haur
Format: Final Year Project
Language:English
Published: 2017
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Online Access:http://hdl.handle.net/10356/71324
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-713242023-03-03T17:06:08Z Colloidal fouling and scaling in reverse osmosis process Jun, Yan Chong Tzyy Haur School of Civil and Environmental Engineering Singapore Membrane Technology Centre DRNTU::Engineering::Environmental engineering::Water supply Water is crucial and essential for life. Despite having majority of the earth surface covered by water, accessing safe water source is an increasing challenge faced by human population. Hence, recycling used water and converting non-potable water to potable are the options being adopted in alleviating the issue. Membrane technology plays an important and reliable role in water treatment. Apart from being energy intensive in most of the water treatment operation, membrane fouling affecting it performance is the biggest issue that the industry faces. Colloidal fouling and scaling are common types of membrane fouling. Trans-membrane pressure, flux and rejection rate are the common methods used to monitor membrane fouling. However, by the time these parameters indicate an event, fouling might have already become very severe. Electrical Impedance Spectroscopy (EIS) is used in this project in monitoring fouling pattern in experiments with colloidal silica, calcium sulfate (CaSO4) scalant and mixture of both. Results show that colloidal fouling exacerbates the effect of cake enhancement concentration polarisation (CECP), reduce the permeate quality. Conductance of the diffusion polarisation layer (GDP) indicates the presence of CECP effect. Scalant formation on membrane surface provides an extra non-porous layer on membrane surface for filtration, hence increases permeate quality. Conductance of the diffusion polarisation layer (GDP) derived from the EIS measurement and scanning electron microscopy (SEM) suggest that surface crystallisation is the main mechanism for scalant formation on the membrane surface in this study. The study which involves both colloidal silica and scalant showing that colloidal silica is the dominant foulant as compared to scalant and this could be observed from the GDP plot as well. Bachelor of Engineering (Environmental Engineering) 2017-05-16T04:20:16Z 2017-05-16T04:20:16Z 2017 Final Year Project (FYP) http://hdl.handle.net/10356/71324 en Nanyang Technological University 44 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water supply
spellingShingle DRNTU::Engineering::Environmental engineering::Water supply
Jun, Yan
Colloidal fouling and scaling in reverse osmosis process
description Water is crucial and essential for life. Despite having majority of the earth surface covered by water, accessing safe water source is an increasing challenge faced by human population. Hence, recycling used water and converting non-potable water to potable are the options being adopted in alleviating the issue. Membrane technology plays an important and reliable role in water treatment. Apart from being energy intensive in most of the water treatment operation, membrane fouling affecting it performance is the biggest issue that the industry faces. Colloidal fouling and scaling are common types of membrane fouling. Trans-membrane pressure, flux and rejection rate are the common methods used to monitor membrane fouling. However, by the time these parameters indicate an event, fouling might have already become very severe. Electrical Impedance Spectroscopy (EIS) is used in this project in monitoring fouling pattern in experiments with colloidal silica, calcium sulfate (CaSO4) scalant and mixture of both. Results show that colloidal fouling exacerbates the effect of cake enhancement concentration polarisation (CECP), reduce the permeate quality. Conductance of the diffusion polarisation layer (GDP) indicates the presence of CECP effect. Scalant formation on membrane surface provides an extra non-porous layer on membrane surface for filtration, hence increases permeate quality. Conductance of the diffusion polarisation layer (GDP) derived from the EIS measurement and scanning electron microscopy (SEM) suggest that surface crystallisation is the main mechanism for scalant formation on the membrane surface in this study. The study which involves both colloidal silica and scalant showing that colloidal silica is the dominant foulant as compared to scalant and this could be observed from the GDP plot as well.
author2 Chong Tzyy Haur
author_facet Chong Tzyy Haur
Jun, Yan
format Final Year Project
author Jun, Yan
author_sort Jun, Yan
title Colloidal fouling and scaling in reverse osmosis process
title_short Colloidal fouling and scaling in reverse osmosis process
title_full Colloidal fouling and scaling in reverse osmosis process
title_fullStr Colloidal fouling and scaling in reverse osmosis process
title_full_unstemmed Colloidal fouling and scaling in reverse osmosis process
title_sort colloidal fouling and scaling in reverse osmosis process
publishDate 2017
url http://hdl.handle.net/10356/71324
_version_ 1759858113121353728