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.

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 Microbial electrolysis cells for production of methane from CO2: long-term performance and perspectives

2011 ◽  
Vol 36 (6) ◽  
pp. 809-819 ◽  
Author(s):  
Mieke C. A. A. Van Eerten-Jansen ◽  
Annemiek Ter Heijne ◽  
Cees J. N. Buisman ◽  
Hubertus V. M. Hamelers
Keyword(s):  
Microbial Electrolysis Cells ◽  
Electrolysis Cells ◽  
Microbial Electrolysis ◽  
Long Term Performance ◽  
Term Performance

scholarly journals ‘Solar septic tank’: evaluation of innovative decentralized treatment of blackwater in developing countries

2020 ◽  
Vol 10 (4) ◽  
pp. 828-840
Author(s):  
Thammarat Koottatep ◽  
Stephanie Connelly ◽  
Tatchai Pussayanavin ◽  
Sopida Khamyai ◽  
Wattanapong Sangchun ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Total Solid ◽  
Septic Tank ◽  
Log Reduction ◽  
Removal Efficiencies ◽  
Decentralized Wastewater Treatment System ◽  
Long Term Performance ◽  
Term Performance

Abstract An innovative decentralized wastewater treatment system, namely the ‘Solar Septic Tank (SST)’, was constructed and tested at the household scale in a community in central Thailand. This study aimed to investigate the long-term performance of the SST in treating blackwater subject to year-round variation. Results of the 3-year continuous operation and monitoring showed significant improvement in the SST effluent quality with the potential to minimize environmental problems and public health risks. The SST achieved significantly higher total chemical oxygen demand, soluble chemical oxygen demand, total biochemical oxygen demand (TBOD), soluble biochemical oxygen demand, total kjeldahl nitrogen, total solid and total volatile solid removal efficiencies than a conventional septic tank (CST). The average TBOD concentration of the SST effluent was 150 ± 75 mg/L, meeting the Thai discharge standard (less than 200 mg/L of TBOD), while the average TBOD concentration of the CST was 240 ± 140 mg/L, higher than the Thai discharge standard. The Escherichia coli inactivation in the SST was 1–2 log reduction more than that in the CST. The removal efficiencies of TBOD and pathogens exhibited positive correlation with the ratios of the SST temperature.

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 Enhanced methane producing microbial electrolysis cells for wastewater treatment using poly(neutral red) and chitosan modified electrodes

2020 ◽  
Vol 4 (8) ◽  
pp. 4238-4248
Author(s):  
Hathaichanok Seelajaroen ◽  
Sabine Spiess ◽  
Marianne Haberbauer ◽  
Melissa Maki Hassel ◽  
Abdalaziz Aljabour ◽  
...  
Keyword(s):  
Modified Electrodes ◽  
Neutral Red ◽  
Carbon Felt ◽  
Microbial Electrolysis Cells ◽  
Electrolysis Cells ◽  
Microbial Electrolysis ◽  
Long Term Performance ◽  
Term Performance ◽  
Felt Electrodes

Microbial electrolysis cells equipped with modified carbon felt electrodes showed enhanced long-term performance of organic degradation and CO2 conversion to CH4.

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.

scholarly journals Long-term continuous production of H 2 in a microbial electrolysis cell (MEC) treating saline wastewater

2015 ◽  
Vol 81 ◽  
pp. 149-156 ◽  
Author(s):  
Alessandro A. Carmona-Martínez ◽  
Eric Trably ◽  
Kim Milferstedt ◽  
Rémy Lacroix ◽  
Luc Etcheverry ◽  
...  
Keyword(s):  
Continuous Production ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Saline Wastewater ◽  
Microbial Electrolysis

scholarly journals Long-Term Performance of a Full-Scale Membrane Plant for Landfill Leachate Pretreatment: A Case Study

Membranes ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 52 ◽  
Author(s):  
Ester Coppini ◽  
Laura Palli ◽  
Donatella Fibbi ◽  
Riccardo Gori
Keyword(s):  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Full Scale ◽  
Landfill Leachates ◽  
Treatment Train ◽  
Long Term Performance ◽  
Term Performance

This paper presents a case study describing a full-scale membrane bioreactor (MBR) for the pretreatment of landfill leachates. The treatment train includes an aerated equalization tank, a denitrification tank, an oxidation/nitrification tank, and two ultrafiltration units. The plant has worked continuously since 2008 treating landfill leachates at a flux of 2–11 L·h−1·m−2. The old train of membranes worked in these conditions for more than seven years prior to being damaged and replaced. The permeability (K) of the membrane varied between 30 and 80 L·h−1·m−2·bar−1 during the years of operation. In 2010, after two years of operation, the oxidation/nitrification tank was changed to work in alternate cycles of aerated and anoxic conditions, in order to improve the denitrification process. The MBR, working at a mean sludge retention time of 144 days and with mixed liquor suspended solids of 17 g/L, achieved high removal rates of conventional contaminants, with more than 98% for Biochemical Oxygen Demand, 96% for ammonium, and 75% for Chemical Oxygen Demand (COD). From the COD balance, half the COD entering was determined to be biologically oxidized into carbon dioxide, while another 24% remains in the sludge. In order to obtain these results, the company used 5.2 KWh·m−3, while spending 0.79 €·m−3.

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