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A Study on the Fouling of Ultrafiltration Membranes Used in the Treatment of an Acidic Solution in a Circular Cross-flow Filtration Bench  

Kim, Nam-Joon (Department of Chemistry, Chungbuk National University)
Choi, Chang-Min (Department of Chemistry, Chungbuk National University)
Choi, Yong-Hun (Department of Chemistry, Chungbuk National University)
Lee, Jun-Ho (Department of Chemistry, Chungbuk National University)
Kim, Hwan-Jin (Department of Chemistry, Chungbuk National University)
Park, Byung-Jae (Chemicore Inc.)
Joo, Young-Kil (Chemicore Inc.)
Kang, Jin-Seok (Chemicore Inc.)
Paik, Youn-Kee (Korea Basic Science Institute)
Publication Information
Membrane Journal / v.19, no.3, 2009 , pp. 252-260 More about this Journal
Abstract
The effects of the treatment of an acidic solution at pH 2 on polyacrylonitrile ultrafiltration (UF) membranes were investigated using a circular cross-flow filtration bench with a membrane module. A substantial reduction in the membrane permeability was observed after 80 hours' treatment of the acidic solution. In addition, the analyses of the sample solutions by ultraviolet/visible absorption spectroscopy and gas chromatography/mass spectrometry (GC/MS), which were taken from the feed tank as a function of the treatment time, showed that a new organic compound was produced in the course of the treatment. From a thorough search of the mass spectral library we presumed the new compound to be 1,6-dioxacyclododecane-7,12-dione (DCD), one of the well-known additives for polyurethane. Based on further experimental results, including the scanning electron microscope (SEM) images and the solid-state NMR spectra of the membranes used for the treatment of the acidic solution, we suggested that the decrease of the permeate flux resulted not from the deformation of the membranes, but from the fouling by DCD eluted from the polyurethane tubes in the filtration bench during the treatment. Those results imply that the reactivity to an acidic solution of the parts comprising the filtration bench is as important as that of the membranes themselves for effective treatments of acidic solutions, for efficient chemical cleaning by strong acids, and also in determining the pH limit of the solutions that can be treated by the membranes.
Keywords
ultrafiltration; polyacrylonitrile; water treatment; pH; fouling;
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