A Combined Heat- and Power-Driven Membrane Capacitive Deionization System

Jiankai Zhang, Kelsey B. Hatzell, Marta C. Hatzell

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Here, we experimentally investigate an alternative membrane capacitive deionization (MCDI) system cycle, which aims to reduce the required electrical energy demand for water treatment. The proposed heat and power combined MCDI system utilizes waste heat to control the electrostatic potential of the charged electrodes during the charging (desalination) and discharging (energy recovery) processes. The experimental findings suggest that with an increase in the temperature of the brine from 20 to 50 °C, the electrical energy consumed can be reduced by nearly 10%. We also show that the dependence of electrostatic potential on concentration may limit energy recovery performance (power), when moving toward higher water recoveries. Alternative desalination cycles can be further explored through evaluating non-isothermal and non-adiabatic system operation.

Original languageEnglish (US)
Pages (from-to)470-474
Number of pages5
JournalEnvironmental Science and Technology Letters
Issue number11
StatePublished - Nov 14 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Ecology
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis


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