膜科学与技术

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Electrocatalytic membrane reactor coupled with ozone system for
the treatment of reverse osmosis retentate from dyeing wastewater
and recovery of Na2SO4

Authors： WANG Ruohan1,2, DU Minghui1,2, WANG Hong1,2, LI Jianxin1,2

Units： 1. School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China; 2. State Key Laboratory of Separation Membrane and Membrane Process, Tiangong University, Tianjin 300387, China

KeyWords： dyeing wastewater; RO concentrate; electrocatalytic membrane reactor; ozone oxidation; Na2SO4 recovery

ClassificationCode：TQ028

year,volume(issue):pagination： 2025,45(3):127-135

Abstract：

The effective treatment of Reverse osmosis (RO) concentrate in dyeing wastewater with high salts and refractory organics is a great challenge. In this study, an electrocatalytic membrane reactor coupled with O3 system (ECMR-O3) was constructed using multi-channel conductive carbon membrane as cathode and graphite plate as auxiliary anode. Further, the ECMR is employed for the treatment of the RO concentrate from dyeing wastewater. The results show that the COD removal rate of RO concentrate by ECMR coupled with O3 reached 93.75%, and the COD mass concentration is reduced to 48.15 mg/L, which meets the “Water Quality Standard for Reuse of Textile Dyeing and Finishing Wastewater” (FZ/T 01107 2011) (COD mass concentration< 50 mg/L). The cost analysis of Na2SO4 recovery shows that 28.1 kg Na2SO4 can be recovered from each ton of dyeing wastewater RO concentrate treated, which has objective economic benefits. Further, electron spin-resonance (ESR) spectroscopy confirmed that ·OH is the key active species for the synergistic effect of ECMR-O3. UV-Vis and 3D-excitation-emission matrix (EEM) spectra clarified the degradation mechanism deeply. In summary, this study provides an effective way for the efficient treatment of RO concentrate from dyeing wastewater.

Funds：

国家重点研发计划项目 (2020YFA0211003)

AuthorIntro：

王若晗（2001-），女，山东济南人，硕士研究生，主要研究方向为膜法水处理

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