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Reclamation of Aniline Wastewater and CO2 Capture Using Bipolar Membrane Electrodialysis

Wang, Qiuyue, Jiang, Chenxiao, Wang, Yaoming, Yang, Zhengjin, Xu, Tongwen
ACS sustainable chemistry 2016 v.4 no.10 pp. 5743-5751
aniline, carbon dioxide, electrodialysis, greenhouse gases, humans, pH, wastewater
Aniline-contained wastewater and greenhouse gases are two significant environmental issues that threaten the life of humans. In this work, a novel bipolar membrane electrodialysis (BMED)-based process was proposed to treat aniline wastewater and simultaneously capture CO₂. Such a process consists of predesalinization, CO₂ capture, and aniline removal in three steps. First, the predesalinization removes the salt in saline aniline wastewater because the aniline is neutral in this condition. Second, in order to adjust the pH of wastewater and make the aniline positively charged, CO₂ is captured, and finally, BMED is used to remove aniline from the feed compartment and then collected in the base compartment, simultaneously recovering CO₂ in the acid compartment. The processes are discussed in terms of multianiline content, multi-CO₂ partial pressure, and multisteps, which clearly indicate the feasibility of the processes in an ecofriendly and low cost way.