LiuXuefeng,HuWen,WuYu,et al.Efficacy of Rocking-chair Capacitive Deionization Technology for Treating Circulating Cooling Water in Power Plants[J].China Water & Wastewater,2026,42(17):105-110.
Efficacy of Rocking-chair Capacitive Deionization Technology for Treating Circulating Cooling Water in Power Plants
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第17期
Page:
105-110
Column:
Date of publication:
2026-09-01
- Keywords:
- rocking-chair capacitive deionization technology; circulating cooling water in power plant; continuous desalination; calcium and magnesium ions
- Abstract:
- To address the issues of high energy consumption, low efficiency, and scaling tendency associated with conventional treatment methods for circulating cooling water in coal-fired power plants, this study proposed the application of rocking-chair capacitive deionization (RCDI) technology for the treatment of such cooling water. The effects of voltage and influent flow rate on desalination performance were systematically investigated through laboratory experiments, and the scale inhibition performance of the technology was verified. The results showed that under the conditions of voltage of 1.8 V, influent flow rate of 100 mL/min, and influent conductivity of 16 000 μS/cm, the RCDI system achieved salt removal rate of 82.1% and charge efficiency of 84.3%. With a cycle of 5 min forward polarization followed by 1 min reverse polarization, no obvious scaling was observed on the membrane module surfaces inside the RCDI reactor after 120 h of operation at 1.8 V and 100 mL/min. Furthermore, a 51-day pilot-scale application study was conducted in a coal-fired power plant. Monitoring data on the 47th day showed that under the conditions of influent flow rate of 100 m3/h, average single-module operating voltage of 1.8 V, influent conductivity of 1 400 μS/cm, and water recovery rate of 75%, the RCDI system achieved salt removal rate of 83.3%. During continuous operation over multiple days, the technology demonstrated good desalination stability, meeting the requirements for continuous and efficient treatment of circulating cooling water, and exhibiting certain potential for engineering application.
Last Update:
2026-09-01