Hydrogen production and COD elimination rate in a continuous microbial electrolysis cell: The influence of hydraulic retention time and applied voltage

2012 ◽  
Vol 32 (2) ◽  
pp. 263-268 ◽  
Author(s):  
A. Escapa ◽  
A. Lobato ◽  
D.M. García ◽  
A. Morán
Keyword(s):  
Hydrogen Production ◽  
Retention Time ◽  
Applied Voltage ◽  
Hydraulic Retention Time ◽  
Elimination Rate ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Microbial Electrolysis

scholarly journals Optimising the Hydraulic Retention Time in a Pilot-Scale Microbial Electrolysis Cell to Achieve High Volumetric Treatment Rates Using Concentrated Domestic Wastewater

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2945 ◽  
Author(s):  
Daniel D. Leicester ◽  
Jaime M. Amezaga ◽  
Andrew Moore ◽  
Elizabeth S. Heidrich
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Direct Analysis ◽  
Pilot Scale ◽  
Electrolysis Cell ◽  
Treatment Technique ◽  
Microbial Electrolysis Cell ◽  
Microbial Electrolysis

Bioelectrochemical systems (BES) have the potential to deliver energy-neutral wastewater treatment. Pilot-scale tests have proven that they can operate at low temperatures with real wastewaters. However, volumetric treatment rates (VTRs) have been low, reducing the ability for this technology to compete with activated sludge (AS). This paper describes a pilot-scale microbial electrolysis cell (MEC) operated in continuous flow for 6 months. The reactor was fed return sludge liquor, the concentrated filtrate of anaerobic digestion sludge that has a high chemical oxygen demand (COD). The use of a wastewater with increased soluble organics, along with optimisation of the hydraulic retention time (HRT), resulted in the highest VTR achieved by a pilot-scale MEC treating real wastewater. Peak HRT was 0.5-days, resulting in an average VTR of 3.82 kgCOD/m3∙day and a 55% COD removal efficiency. Finally, using the data obtained, a direct analysis of the potential savings from the reduced loading on AS was then made. Theoretical calculation of the required tank size, with the estimated costs and savings, indicates that the use of an MEC as a return sludge liquor pre-treatment technique could result in an industrially viable system.

A NEW DESIGN ENHANCES HYDROGEN PRODUCTION BY G. SULFURREDUCENS PCA STRAIN IN A SINGLE-CHAMBER MICROBIAL ELECTROLYSIS CELL (MEC)

2017 ◽  
Vol 79 (5-3) ◽  
Author(s):  
Abudukeremu Kadier ◽  
Mohd Sahaid Kalil ◽  
Azah Mohamed ◽  
Aidil Abdul Hamid
Keyword(s):  
Hydrogen Production ◽  
Applied Voltage ◽  
Renewable Energy Sources ◽  
Geobacter Sulfurreducens ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Single Chamber ◽  
Operational Costs ◽  
Wide Range ◽  
Microbial Electrolysis

Microbial electrolysis cell (MEC) is an innovative and green technology to generate hydrogen from a wide range of renewable energy sources and wastewater. At current stage, the performance of these systems is still far from real-world applications. The most likely limiting factors for successful commercialization of this technology are the large internal resistance, high fabrication and operational costs. The aim of the present study was to enhance hydrogen production, reduce the construction and operational costs in MECs via development of a novel MEC design. A single-chamber membrane-free MEC was designed and successfully produced hydrogen from organic substrate using a pure culture: Geobacter sulfurreducens PCA. The MEC system was operated with Platinum (Pt) cathode at applied voltage range of 0.6 V to 1.1 V. Geobacter sulfurreducens PCA strain and sodium acetate used as inoculum and a fuel sources, respectively. The conductivity of electrolyte solution in the MEC was 4.5 mS/cm. Due to an improved the MEC reactor architecture, the maximum hydrogen production rate (HPR) of 3.67 ± 0.03 m3 H2 /m3 d with volumetric current density (IV) of 293.73 ± 1.18 A/m3 was achieved under an external applied voltage (Eap): 1.1 V. The highest overall hydrogen recovery ( ) and overall energy efficiency ( ) were 91.80 ± 1.06% and 66.97 ± 0.09%, respectively. 

Maximizing Coulombic recovery and solids reduction from primary sludge by controlling retention time and pH in a flat-plate microbial electrolysis cell

2017 ◽  
Vol 3 (2) ◽  
pp. 333-339 ◽  
Author(s):  
Dongwon Ki ◽  
Prathap Parameswaran ◽  
Sudeep C. Popat ◽  
Bruce E. Rittmann ◽  
César I. Torres
Keyword(s):  
Flat Plate ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Electrolysis Cell ◽  
Anode Chamber ◽  
Microbial Electrolysis Cell ◽  
Primary Sludge ◽  
Sludge Stabilization ◽  
Microbial Electrolysis

Control of hydraulic retention time and pH of the anode chamber in a flat-plate microbial electrolysis cell can improve Coulombic recovery and sludge stabilization.

Hydrogen production in a microbial electrolysis cell fed with a dark fermentation effluent

2015 ◽  
Vol 45 (11) ◽  
pp. 1223-1229 ◽  
Author(s):  
Isaac Rivera ◽  
Germán Buitrón ◽  
Péter Bakonyi ◽  
Nándor Nemestóthy ◽  
Katalin Bélafi-Bakó
Keyword(s):  
Hydrogen Production ◽  
Dark Fermentation ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Microbial Electrolysis

Enhancement of sludge decomposition and hydrogen production from waste activated sludge in a microbial electrolysis cell with cheap electrodes

2015 ◽  
Vol 1 (6) ◽  
pp. 761-768 ◽  
Author(s):  
Yinghong Feng ◽  
Yiwen Liu ◽  
Yaobin Zhang
Keyword(s):  
Hydrogen Production ◽  
Activated Sludge ◽  
Waste Activated Sludge ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Graphite Electrodes ◽  
Sludge Digestion ◽  
Microbial Electrolysis

Cheap Fe/graphite electrodes substantially enhanced hydrogen production from anaerobic waste activated sludge digestion in a microbial electrolysis cell.

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