Removal of heavy metals from electroplating wastewater by membrane

This research was to study the treatment of heavy metals in electroplating wastewater using membranes. Two selected membrane types, cellulose acetate microfiltration membrane with pore size 0.2 μm and polysulfone ultrafiltration membrane with MWCO of 30 kDa were used in this study. Synthetic and fac...

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Main Authors: Galaya Srisuwan, Poonpetch Thongchai
Format: Article
Language:English
Published: Prince of Songkla University 2002-11-01
Series:Songklanakarin Journal of Science and Technology (SJST)
Subjects:
Online Access:http://www.sjst.psu.ac.th/journal/24_Suppl_membrane/23heavy-metal.p.pdf
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spelling doaj-a1a31fa64d2d4587bdbbf91937355a872020-11-24T21:41:33ZengPrince of Songkla UniversitySongklanakarin Journal of Science and Technology (SJST)0125-33952002-11-0124Suppl.965976Removal of heavy metals from electroplating wastewater by membraneGalaya SrisuwanPoonpetch ThongchaiThis research was to study the treatment of heavy metals in electroplating wastewater using membranes. Two selected membrane types, cellulose acetate microfiltration membrane with pore size 0.2 μm and polysulfone ultrafiltration membrane with MWCO of 30 kDa were used in this study. Synthetic and factory electroplating wastewater were used as the samples. The experiments were performed by chemical precipitating both synthetic and factory wastewater in the first step and membrane filtrating of supernatant at the pressure of 50, 100 and 200 kPa in the second step. The concentration of chromium, copper, nickel and zinc of treated water were compared with standard values given by the Ministry of Industry (MOI), Thailand. The experimental results showed that flux was highest at the pressure of 200 kPa and decreased as the pressure decreased. The rejection was highest at the pressure of 50 kPa and decreased as pressure increased. The results from synthetic wastewater were better than those from factory wastewater. Thecapability of heavy metal removal of microfiltration and ultrafiltration membrane was the same, but microfiltration gave more flux. The heavy metal removal efficiency of microfiltration of synthetic electroplating wastewater of four processes of chromium, copper, nickel and zinc electroplating , each was higher than that from factory wastewater but slightly lower than the removal efficiency obtained from composite synthetic wastewater. The removal efficiency of chromium, copper, nickel and zinc from composite synthetic wastewater was higher than those from composite factory wastewater for both microfiltration and ultrafiltration processes. The results from the study of membrane surface washing showed little flux increase after washing the membrane by stirring with a propeller at a distance of 2 mm above membrane surface at 400 rpm for 30 minutes.http://www.sjst.psu.ac.th/journal/24_Suppl_membrane/23heavy-metal.p.pdfmembraneheavy metalselectroplatingwastewater
collection DOAJ
language English
format Article
sources DOAJ
author Galaya Srisuwan
Poonpetch Thongchai
spellingShingle Galaya Srisuwan
Poonpetch Thongchai
Removal of heavy metals from electroplating wastewater by membrane
Songklanakarin Journal of Science and Technology (SJST)
membrane
heavy metals
electroplating
wastewater
author_facet Galaya Srisuwan
Poonpetch Thongchai
author_sort Galaya Srisuwan
title Removal of heavy metals from electroplating wastewater by membrane
title_short Removal of heavy metals from electroplating wastewater by membrane
title_full Removal of heavy metals from electroplating wastewater by membrane
title_fullStr Removal of heavy metals from electroplating wastewater by membrane
title_full_unstemmed Removal of heavy metals from electroplating wastewater by membrane
title_sort removal of heavy metals from electroplating wastewater by membrane
publisher Prince of Songkla University
series Songklanakarin Journal of Science and Technology (SJST)
issn 0125-3395
publishDate 2002-11-01
description This research was to study the treatment of heavy metals in electroplating wastewater using membranes. Two selected membrane types, cellulose acetate microfiltration membrane with pore size 0.2 μm and polysulfone ultrafiltration membrane with MWCO of 30 kDa were used in this study. Synthetic and factory electroplating wastewater were used as the samples. The experiments were performed by chemical precipitating both synthetic and factory wastewater in the first step and membrane filtrating of supernatant at the pressure of 50, 100 and 200 kPa in the second step. The concentration of chromium, copper, nickel and zinc of treated water were compared with standard values given by the Ministry of Industry (MOI), Thailand. The experimental results showed that flux was highest at the pressure of 200 kPa and decreased as the pressure decreased. The rejection was highest at the pressure of 50 kPa and decreased as pressure increased. The results from synthetic wastewater were better than those from factory wastewater. Thecapability of heavy metal removal of microfiltration and ultrafiltration membrane was the same, but microfiltration gave more flux. The heavy metal removal efficiency of microfiltration of synthetic electroplating wastewater of four processes of chromium, copper, nickel and zinc electroplating , each was higher than that from factory wastewater but slightly lower than the removal efficiency obtained from composite synthetic wastewater. The removal efficiency of chromium, copper, nickel and zinc from composite synthetic wastewater was higher than those from composite factory wastewater for both microfiltration and ultrafiltration processes. The results from the study of membrane surface washing showed little flux increase after washing the membrane by stirring with a propeller at a distance of 2 mm above membrane surface at 400 rpm for 30 minutes.
topic membrane
heavy metals
electroplating
wastewater
url http://www.sjst.psu.ac.th/journal/24_Suppl_membrane/23heavy-metal.p.pdf
work_keys_str_mv AT galayasrisuwan removalofheavymetalsfromelectroplatingwastewaterbymembrane
AT poonpetchthongchai removalofheavymetalsfromelectroplatingwastewaterbymembrane
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