An integrated microbial desalination cell-driven capacitive deionization system as an electrochemical means for wastewater treatment, electricity generation and desalination
Journal
ECS Transactions
Journal Volume
77
Journal Issue
7
Pages
91-98
Date Issued
2017
Author(s)
Abstract
In this study, we propose a hybrid, energy-saving electrochemical desalination system to deliver fresh water by coupling membrane capacitive deionization (MCDI) cell with microbial desalination cell (MDC) reactors. As a result, MDC produced electricity with open circuit voltage of 0.8 V and a current of 3 mA by using bacteria to degrade organic contaminants through anode bacterial oxidation and cathode reduction. In MDC, 91% removal of chemical oxygen demand (COD) in synthetic wastewater can be achieved, and the solution conductivity of salt water in desalination chamber can be reduced from 17, 000 μS/cm to about 300 μS/cm. More importantly, CDI device can be directly driven by harvesting electricity from the two MDC reactors in series, and as the downstream desalination process to further desalinate the salt water. The results of this study can demonstrate the feasibility of the integrated electrochemical MDC-MCDI system for simultaneous wastewater treatment, power production, and water desalination. © The Electrochemical Society.
Other Subjects
Biodegradation; Chemical oxygen demand; Desalination; Electrodes; Energy conservation; Open circuit voltage; Photonics; Wastewater treatment; Water filtration; Capacitive deionization; Desalination systems; Electricity generation; Membrane capacitive deionization; Microbial desalination cells; Microbial desalination cells (MDC); Solution conductivity; Synthetic waste water; Electric power generation
Type
conference paper