Efficient salt removal in a continuously operated upflow microbial desalination cell with an air cathode.

Microbial desalination cells (MDCs) hold great promise for drinking water production because of potential energy savings during the desalination process. In this study, we developed a continuously operated MDC--upflow microbial desalination cell (UMDC) for the purpose of salt removal. During the 4-month operation, the UMDC constantly removed salts and generated bio-electricity. At a hydraulic retention time (HRT) of 4 days (salt solution) and current production of ∼62 mA, the UMDC was able to remove more than 99% of NaCl from the salt solution that had an initial salt concentration of 30 g total dissolved solids (TDS)/L. In addition, the TDS removal rate was 7.50 g TDSL(-1)d(-1) (salt solution volume) or 5.25 g TDSL(-1)d(-1) (wastewater volume), and the desalinated water met the drinking water standard, in terms of TDS concentration. A high charge transfer efficiency of 98.6% or 81% was achieved at HRT 1 or 4d. The UMDC produced a maximum power density of 30.8 W/m(3). The phenomena of bipolar electrodialysis and proton transport in the UMDC were discussed. These results demonstrated the potential of the UMDC as either a sole desalination process or a pre-desalination reactor for downstream desalination processes.

[1]  G. Campbell,et al.  An Introduction to Environmental Biophysics , 1977 .

[2]  C. Buisman,et al.  Towards practical implementation of bioelectrochemical wastewater treatment. , 2008, Trends in biotechnology.

[3]  W. Verstraete,et al.  Continuous electricity generation at high voltages and currents using stacked microbial fuel cells. , 2006, Environmental science & technology.

[4]  J. Georgiadis,et al.  Science and technology for water purification in the coming decades , 2008, Nature.

[5]  Zhen He,et al.  Electricity generation from artificial wastewater using an upflow microbial fuel cell. , 2005, Environmental science & technology.

[6]  H. Hamelers,et al.  Effects of membrane cation transport on pH and microbial fuel cell performance. , 2006, Environmental science & technology.

[7]  E. E. L O G A N.  Microbial Fuel Cells : Methodology and Technology † , 2022 .

[8]  Chuanhui Huang,et al.  Electrodialysis with bipolar membranes for sustainable development. , 2006, Environmental science & technology.

[9]  Akili D. Khawaji,et al.  Advances in seawater desalination technologies , 2008 .

[10]  E. Delyannis,et al.  Desalination by using alternative energy: Review and state-of-the-art , 2007 .

[11]  Yoshinobu Tanaka,et al.  Water dissociation in ion-exchange membrane electrodialysis , 2002 .

[12]  Gilbert M. Masters,et al.  Introduction to Environmental Engineering and Science , 1991 .

[13]  Ram S. Gupta.  Introduction to environmental engineering and science , 2004 .

[14]  P E N G L I A N G, † K A N G X I A O, † Y I N G J U,et al.  A New Method for Water Desalination Using Microbial Desalination Cells , 2009 .

[15]  S Venkata Mohan,et al.  Bio-electrochemical treatment of distillery wastewater in microbial fuel cell facilitating decolorization and desalination along with power generation. , 2010, Journal of hazardous materials.

[16]  A. N N E M I E K T E R H E I J N E,et al.  A Bipolar Membrane Combined with Ferric Iron Reduction as an Efficient Cathode System in Microbial Fuel Cells† , 2022 .

[17]  I. Karagiannis,et al.  Water desalination cost literature: review and assessment , 2008 .

[18]  Yujie Feng,et al.  Use of carbon mesh anodes and the effect of different pretreatment methods on power production in microbial fuel cells. , 2009, Environmental science & technology.