Application of Membrane Capacitive Deionization as Pretreatment Strategy for Enhancing Salinity Gradient Power Generation
Seoyeon Lee, Juyoung Lee, Jaehyun Ju, Hyeongrak Cho, Yongjun Choi, Sangho Lee
TL;DR
This paper explores using membrane capacitive deionization to improve salinity gradient power generation by reducing membrane fouling.
Contribution
The novel use of MCDI as a pretreatment for PRO and RED systems is proposed and experimentally validated.
Findings
MCDI achieved 88.8% organic and 78.8% inorganic removal from BWRO brine.
PRO power density increased from 1.14 W/m2 to 3.57 W/m2 after MCDI pretreatment.
RED power density improved from 1.47 W/m2 to 2.05 W/m2 with MCDI.
Abstract
Salinity gradient power (SGP) technologies, including pressure-retarded osmosis (PRO) and reverse electrodialysis (RED), have the potential to be utilized for the purpose of harvesting energy from the difference in salinity between two water streams. One challenge associated with SGP is a reduction in power density due to membrane fouling when impaired water is utilized as a low-salinity water stream. Accordingly, this study sought to explore the feasibility of membrane capacitive deionization (MCDI), a low-energy water treatment technique, as a novel pretreatment method for SGP. Laboratory-scale experiments were conducted to evaluate the impact of MCDI pretreatment on the performance of PRO and RED. The low-salinity water was obtained from a brackish water reverse osmosis (BWRO) plant, while the high-salinity water was a synthetic seawater desalination brine. The removal efficiency of…
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Taxonomy
TopicsMembrane-based Ion Separation Techniques · Membrane Separation Technologies · Microgrid Control and Optimization