A novel microbial electrolysis cell-A/O system treating cotton dyeing pretreatment wastewater: performance and microbial diversity analysis

2019 ◽  
Vol 79 (11) ◽  
pp. 2156-2165 ◽  
Author(s):  
Donglei Wu ◽  
Mingjie Zhang ◽  
Meiqing Yang ◽  
Shuwen Du ◽  
Weiwang Chen ◽  
...  
Keyword(s):  
Microbial Diversity ◽  
Applied Voltage ◽  
Textile Industry ◽  
Oxygen Demand ◽  
Electrolytic Cell ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Activity Increase ◽  
Microbial Electrolysis ◽  
Cotton Dyeing

Abstract The textile industry is developing rapidly in China. It generates large volumes of cotton dyeing pretreatment wastewater (CDPW). CDPW contains high concentrations of pollutants characterized by their strongly alkaline and recalcitrant nature for microbial degradation. This project aimed to evaluate the performance of a microbial electrolysis cell (MEC) coupled with anoxic/oxic (A/O) system (MEC-A/O) in treating CDPW, as well as analyze changes in microbial diversity. The results indicated that the effect of biological treatment in an electrolytic cell to treat CDPW was optimal at the voltage of 0.6V. The chemical oxygen demand (COD) removal efficiency under optimum conditions was 69.13%, higher than that of the A/O system alone (48.93%). Within a certain range, applied voltage was able to enhance microbial activity, increase the sludge concentration and enlarge the sludge particle size. At the same time, the applied voltage could effectively increase the abundance and the diversity of Bacteria and Archaea, as well as accelerate the degradation of pollutants.

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.

scholarly journals Upscaling of Microbial Electrolysis Cell Integrating Microbial Electrosynthesis: Insights, Challenges and Perspectives

2019 ◽  
Author(s):  
Jiang-Hao Tian ◽  
Rémy Lacroix ◽  
Elie Desmond-Le Quéméner ◽  
Chrystelle Bureau ◽  
Cédric Midoux ◽  
...  
Keyword(s):  
Organic Molecules ◽  
Removal Rate ◽  
Coulombic Efficiency ◽  
Market Price ◽  
Electrolytic Cell ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Microbial Electrosynthesis ◽  
Anodic Chamber ◽  
Microbial Electrolysis

AbstractRecent development of microbial electrochemical technologies has allowed microbial electrosynthesis (MES) of organic molecules with microbial electrolysis cell treating waste organic matter. An electrolytic cell with a MES cathode (ME-ME cell) can produce soluble organic molecules with higher market price than biomethane, and thus satisfy both economic and environmental interest. However, the sustainability of bioanode activity could become a major concern. In this work, a 15-liter ME-ME reactor was designed with specific electrode configurations. An electrochemical model was established to assess the feasibility and possible performance of the design, considering the “aging” effect of the bioanode. The reactor was then built and operated for performance evaluation as well as bioanode regeneration assay. Biowaste from an industrial deconditioning platform was used as substrate for bioanode. The COD removal rate in the anodic chamber reached 0.83 g day-1 L-1 of anolyte and the anodic coulombic efficiency reached 98.6%. Acetate was produced with a rate of 0.53 g day-1 L-1 of catholyte, reaching a maximum concentration of 8.3 g L-1. A potential difference was applied between the bioanode and biocathode independent of reference electrodes. The active biocathode was dominated by members of the Genus Pseudomonas, rarely reported so far for MES activity.

scholarly journals Long-term performance of a microbial electrolysis cell operated with periodic disconnection of power supply

RSC Advances ◽  
2018 ◽  
Vol 8 (30) ◽  
pp. 16842-16849 ◽  
Author(s):  
S. A. Hussain ◽  
M. Perrier ◽  
B. Tartakovsky
Keyword(s):  
Chemical Oxygen Demand ◽  
Power Supply ◽  
Oxygen Demand ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
New Approach ◽  
Microbial Electrolysis ◽  
Long Term Performance ◽  
Term Performance

This study describes a new approach for achieving stable long-term performance and maximizing removal of chemical oxygen demand (COD) in a Microbial Electrolysis Cell (MEC) by periodic disconnection of the MEC power supply.

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. 

scholarly journals Applied voltage optimization for denitrification process improvement by denitrifying species of Pseudomonas in microbial electrolysis cell (MEC)

2018 ◽  
Vol 67 ◽  
pp. 02027
Author(s):  
Putty Ekadewi ◽  
Matthew Hardhi ◽  
Putri Anggun Puspitarini ◽  
Hidayati Istiqomah ◽  
Cristina Gomez ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Removal Efficiency ◽  
Applied Voltage ◽  
Nitrate Removal ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
External Power Source ◽  
Pseudomonas Nitroreducens ◽  
External Power ◽  
Microbial Electrolysis

Denitrification is the conversion process of nitrate to gaseous nitrogen forms carried out by bacteria commonly referred to as denitrifiers. Microbial Electrolysis Cell (MEC) is a type of bioelectrochemical system (BES) that is connected to external power source to aid the reactions. This research investigates the effect of applied voltage value on denitrification by nitrate removal efficiency of two model denitrifying species from the genus Pseudomonas in single-chambered MEC. Pseudomonas aeruginosa and Pseudomonas nitroreducens exhibited native removal efficiency at 70.62% and 68.20%, respectively. These values respectively reached up to 89.67% and 88.58% at 1.20 V, the upper limit of this study. Pseudomonas aeruginosa displayed better performance in MEC based off its produced current stability (mA) across the 0.35-1.20 V range. The effect of applied voltage on nitrate removal efficiency and setup performance was more prominent on known exoelectrogenic species of Pseudomonas such as Pseudomonas aeruginosa compared to Pseudomonas nitroreducens. Operating applied voltages of 0.35 V and 0.70 V was recommended for the application of the system based on technical and economical considerations. Further studies are needed to determine the response of the bacteria on wider range of applied voltages in MEC as well as elucidating these effects on autotrophic systems.

scholarly journals Bio-Electrochemical Enhancement of Hydrogen and Methane Production in a Combined Anaerobic Digester (AD) and Microbial Electrolysis Cell (MEC) from Dairy Manure

2020 ◽  
Vol 12 (20) ◽  
pp. 8491
Author(s):  
Amro Hassanein ◽  
Freddy Witarsa ◽  
Stephanie Lansing ◽  
Ling Qiu ◽  
Yong Liang
Keyword(s):  
Energy Production ◽  
Waste Treatment ◽  
Oxygen Demand ◽  
Electrical Energy ◽  
Dairy Manure ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Digestion Process ◽  
Ch4 Production ◽  
Microbial Electrolysis

Anaerobic digestion (AD) is a biological-based technology that generates methane-enriched biogas. A microbial electrolysis cell (MEC) uses electricity to initiate bacterial oxidization of organic matter to produce hydrogen. This study determined the effect of energy production and waste treatment when using dairy manure in a combined AD and MEC (AD-MEC) system compared to AD without MEC (AD-only). In the AD-MEC system, a single chamber MEC (150 mL) was placed inside a 10 L digester on day 20 of the digestion process and run for 272 h (11 days) to determine residual treatment and energy capacity with an MEC included. Cumulative H2 and CH4 production in the AD-MEC (2.43 L H2 and 23.6 L CH4) was higher than AD-only (0.00 L H2 and 10.9 L CH4). Hydrogen concentration during the first 24 h of MEC introduction constituted 20% of the produced biogas, after which time the H2 decreased as the CH4 concentration increased from 50% to 63%. The efficiency of electrical energy recovery (ηE) in the MEC was 73% (ηE min.) to 324% (ηE max.), with an average increase of 170% in total energy compared to AD-only. Chemical oxygen demand (COD) removal was higher in the AD-MEC (7.09 kJ/g COD removed) system compared to AD-only (6.19 kJ/g COD removed). This study showed that adding an MEC during the digestion process could increase overall energy production and organic removal from dairy manure.

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