Reclamation of Aniline Wastewater and CO2 Capture Using Bipolar Membrane Electrodialysis

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.