Mechanisms of chemical cleaning of ion exchange membranes: A case study of plant-scale electrodialysis for oily wastewater treatment
作者： Haicheng Guo , Fanchao You , Shuili Yu , Lei Li , Dongsheng Zhao
DOI: 10.1016/J.MEMSCI.2015.09.005
关键词:
摘要: Abstract Chemical cleaning of ion exchange membranes (IEMs) in plant-scale electrodialysis (ED) for treating oily wastewater was investigated. Bench-scale ED experiments were conducted to elucidate the effects chemical on desalination performance IEMs and results showed that HCl a more efficient agent both cation membrane (CEM) anion (AEM) than NaOH. By analyzing composition solutions, we suggested NaOH could effectively remove anionic polyacrylamide (APAM) fouling CEMs while better removing APAM AEMs, which can be reasonably explained by deprotonation/protonation NaOH/HCl electrostatic interactions between molecules IEMs. Results also demonstrated effective oil IEMs; inorganic precipitations eliminated through double decomposition neutralization reactions. Moreover, morphologies analysis cleaned along with fouled ones conducted, confirmed scales mostly removed cleaning. Furthermore, X-ray diffraction (XRD) revealed mainly caused deposition calcite.
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