Membrane capacitive deionization for low-salinity desalination in the reclamation of domestic wastewater effluents
Journal
Chemosphere
Journal Volume
235
Pages
413-422
Date Issued
2019
Author(s)
Abstract
This study aims to investigate the feasibility of desalinating secondary effluent from a domestic wastewater treatment plant (DWTP) using membrane capacitive deionization (MCDI) for reclamation purposes. The desalination performance of a MCDI stack with 10 pairs of 20 cm × 20 cm activated carbon electrodes was evaluated in single-pass mode. As evidenced, the MCDI stack outperformed the capacitive deionization stack. The water quality characteristics of the inflows and product water were also analyzed. Our results revealed that MCDI can effectively remove undesired ions such as calcium and nitrate from the DWTP effluent for water reclamation. In particular, the solution conductivity of the product water was observed to be as low as 1.27 μS/cm. Removal of the ions was easily performed by the electrostatic field-assisted deionization process. The use of MCDI for low-salinity wastewater reclamation demonstrated favorable energy performance with a low volumetric energy input and a molar energy input of 0.12 kWh/m3 and 0.03 kWh/mole, respectively; and the energy efficiency of this system is expected to be further improved by energy recovery or incorporation of energy-producing processes. These results are indicative of the benefits of using MCDI as part of the treatment processes for the reclamation of wastewater with low salinity. © 2019 Elsevier Ltd
Other Subjects
Activated carbon; Activated carbon treatment; Calcium compounds; Desalination; Effluent treatment; Effluents; Electrodes; Energy efficiency; Sewage treatment plants; Wastewater treatment; Water conservation; Water quality; Activated carbon electrode; Capacitive deionization; Domestic wastewater effluents; Domestic wastewater treatment plants; Electrosorption; Membrane capacitive deionization; Water quality characteristics; Water reuse; Wastewater reclamation; calcium; magnesium; nitrate; potassium; sodium; carbon; charcoal; nitric acid derivative; sodium chloride; water; activated carbon; degradation; desalination; effluent; electrode; feasibility study; membrane; performance assessment; recycling; salinity; sorption; wastewater treatment; adsorption; Article; chemical oxygen demand; comparative study; conductance; current density; cyclic potentiometry; desalination; desorption; domestic waste; effluent; energy recovery; environmental reclamation; impedance spectroscopy; inductively coupled plasma optical emission spectrometry; ion chromatography; ion transport; membrane capacitive deionization; pore volume; renewable energy; salinity; spectroscopy; Taiwan; waste water; waste water management; waste water treatment plant; water analysis; water quality; artificial membrane; chemistry; electric conductivity; electrode; procedures; salinity; sewage; water management; Carbon; Charcoal; Electric Conductivity; Electrodes; Membranes, Artificial; Nitrates; Salinity; Sodium Chloride; Waste Disposal, Fluid; Waste Water; Water; Water Purification
Publisher
Elsevier Ltd
Type
journal article