Abstract: [Objectives]　To address the issues of fouling and clogging of ion exchange membranes during the operation of absorbent electrodialysis regeneration units in chemical absorption carbon capture systems, operating conditions and treatment strategies are investigated to optimize the operation process and extend the service life of the ion exchange membranes. [Methods]　In the membrane fouling test device, degraded absorbent samples obtained from actual engineering operations are utilized to conduct soaking tests on membranes under different conditions. The cleaning effectiveness of the chemical cleaning method and the reverse current flushing method on the fouled membranes are verified, and the removal performance of different treatment methods, including activated carbon, molecular sieves, and silica gel, on characteristic metal ions are compared. [Results]　The surface of ion exchange membranes exhibits different degrees of fouling with immersion time. An immersion temperature higher than 40 ℃ significantly aggravates fouling, and at 60 ℃ it can cause cracking in cation exchange membranes. The chemical cleaning method can restore the membrane surface condition, and its operational convenience is superior to that of the reverse current flushing method. The removal rate of iron ions by high-precision activated carbon exceeds 50%, while molecular sieves and silica gel show limited removal performance. Based on the experimental results, an industrial electrodialysis regeneration unit scheme integrating filtration, desalination, and chemical dosing units is proposed. The filtration unit combines activated carbon adsorption with a heat exchanger to reduce the temperature to below 40 ℃ and intercept contaminants, and the chemical dosing unit enables in-line chemical cleaning. [Conclusions]　The optimized industrial scheme can reduce the risk of membrane fouling and extend membrane service life, thereby facilitating the large-scale application of electrodialysis technology in carbon capture engineering.

Key words: carbon capture, ion exchange membrane, electrodialysis, purification and recovery, chemical absorption, absorbent, process optimization