Investigating the potential of locally sourced wastewater as a feedstock of microbial desalination cell (MDC) for bioene
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RESEARCH PAPER
Investigating the potential of locally sourced wastewater as a feedstock of microbial desalination cell (MDC) for bioenergy production Rabia Liaquat1 · Tariq Mehmood1 · Asif Hussain Khoja1 · Naseem Iqbal1 · Haider Ejaz2 · Sadia Mumtaz3 Received: 11 May 2020 / Accepted: 20 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Freshwater sources are limited and access to clean water is an acute challenge in recent decades. The sustainable water treatments methods are need of time and water desalination is one of the most interesting technology. Most desalination technologies are required high energy input while Microbial Desalination Cells (MDCs) represent a sustainable option that has added benefit of solving the ever-increasing wastewater treatment and management problem. MDCs are a customized type of Microbial Fuel Cells (MFCs) that depend on the electric potential generated by organic media to decrease salt concentration by electro-dialysis and give an unconventional way of clean water production. In this research, various experiments were conducted to examine the desalination ability of an indigenously designed experimental setup using domestic wastewater inoculated with sewage sludge under identical conditions. The electrochemical properties of the system, comprising the polarization curve and Electrochemical Impedance Spectroscopy (EIS), were examined along with the scope of chemical oxygen demand (COD) exclusion, to distinguish the cell behaviour. Furthermore, acidic water and Phosphate Buffer Solution (PBS) were tested as potential catholytes compared to the performance of the wastewater was gauged at various salt concentrations. The maximum salt removal efficiency was 31%, power density and current density were 32 mW-m−2 and 246 mA-m−2 respectively at a salt concentration of 35 g-L−1 that decreases with a decline in salt concentration. The maximum achieved power density and current density were 32 mW-m−2 and 246 mA-m−2 respectively. The applied method has huge potential to scaleup for large scale application in coastal regions. Keywords Microbial desalination cell · Bioelectricity · COD removal · Domestic wastewater treatment
Introduction Water is the basic needs of human life and a vital component required for the human body and other living organisms. Unfortunately, the main portion (97%) of water is found in the form of seawater which has high salinity and unfit * Rabia Liaquat [email protected] 1
U.S ‑Pakistan Center for Advanced Studies in Energy (USPCAS‑E), National University of Science and Technology (NUST), (44000) Sector H‑12, Islamabad, Pakistan
2
Department of Chemical and Biochemical Engineering, Rutgers University, Piscataway, NJ 08854, USA
3
Department of Biotechnology, Faculty of Science and Technology, Women University of Azad Jammu & Kashmir Bagh, Bagh, Pakistan
for direct human intake. The remaining 3% is a freshwater resource and only 1% is easily accessible which is an acute indication of water crises in future [13, 3
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