Journal: Process Safety and Environmental Protection

Authors: Van-Huy Nguyen, Quoc Ba Tranc, Xuan Cuong Nguyenc, Le Thanh Hai, Thi Thanh Tam Ho, Mohammadreza Shokouhimehr, Dai-Viet N. Vo, Su Shiung Lam, Hai Phong Nguyen, Cong Tin Hoang, Quang Viet Ly, Wanxi Peng, Soo Young Kim, Tra Van Tunge, Quyết Văn Le

IF: 4.213

Abstract: A submerged photocatalytic membrane reactor (SPMR) was used with suspended and immobilized N–TiO₂ under visible irradiation for diclofenac (DCF) removal from wastewater. The effects of initial N–TiO2 concentrations for the SPMR with suspended N–TiO₂ were determined for batch processes. Hydrogen peroxide was also coupled with the photocatalytic process. In continuous conditions, a reverse osmosis (RO) membrane was combined with the SPMR for enhancing effluent quality. DCF removal by the SPMR with suspended and immobilized N–TiO₂ at a low N–TiO₂ dosage (0.5 g/L) was not much different between the two systems, but increased with higher N–TiO2 dosages for the reactor with sus[1]pended N–TiO₂. Coupling H₂O₂ with the photocatalytic process under visible irradiation enhanced the DCF removal efficiency. In continuous conditions, DCF concentrations in the photoreactor increased dur[1]ing the reaction time, while those in the effluent (RO permeate) were steady for both systems and both processes. The permeate flux in the reactor with suspended N–TiO₂ declined faster than in the reactor with the immobilized N–TiO₂. Coupling H₂O₂ with the photocatalytic process yielded more resistant per[1]meate flux rates. The cake layer formed on the microfiltration membrane of the SPMR with suspended N–TiO₂ under visible irradiation was denser than others after completing the process.