Simultaneous power generation and pollutant removals using microbial desalination cell at variable operation modes

Ragab, Mostafa; Elawwad, Abdelsalam; Abdel-Halim, Hisham

doi:10.1016/j.renene.2019.05.068

Cited by 37 publications

(21 citation statements)

References 32 publications

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“…The reduction in CE with airflow rate is attributed to the lower energy generation at a 3 mL/min airflow rate. The COD removal in this study on par with Ragab et al and is higher than that previously reported for biocathode MDCs as shown in Table . However, Perazzoli et al reported 99.8% removal of organic carbon in an anoxic biocathode MDC (Table ), which is higher than that of this study.…”

Section: Resultscontrasting

confidence: 54%

Co-existing Anammox, Ammonium-Oxidizing, and Nitrite-Oxidizing Bacteria in Biocathode-Biofilms Enable Energy-Efficient Nitrogen Removal in a Bioelectrochemical Desalination Process

Ghimire

Gude

Smith

et al. 2021

ACS Sustainable Chem. Eng.

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In this study, a nitritation-anammox biocathode microbial desalination cell (NiA mox MDC) was studied for its potential in nitrogen and salinity removal. A maximum power density of 1.007 W/ m 3 and an average TDS removal of 53.9 ± 4.1% were accomplished. The average COD (chemical oxygen demand) removal in each cycle was around 72.1 ± 1.6%, and the corresponding average CE (Coulombic efficiency) of the NiA mox MDC was 25.6 ± 6.1%. The net energy produced by the NiA mox MDC at an aeration rate of 3 mL/ min was 0.031 kWh/m 3 . The energy consumption by the NiA mox MDC was between 0.12 and 0.58 kWh/kg-N, which is significantly lower than other conventional and bioelectrochemical nitrogen removal processes. At an aeration rate of 3 mL/min or a dissolved oxygen concentration of 0.8 mg-O 2 /L, 97.7% of the NH 4 + -N removal and 74.7% of the total nitrogen removal were achieved. Microbial community analysis of the nitritation-anammox cathode showed a relative abundance species of 29.3% belonging to the order of Ignavibacteriales. The second most abundant phylum was affiliated to the Planctomycetes phylum (20.5%) belonging to the order of Candidatus Brocadiales. Aerobic ammonium-oxidizing bacteria (AOBs), Nitrospira multiformis, Nitrosomonas europaea genome sequence, and Nitrosomonas sp. with relative abundances of 0.1%, 0.05%, and 1.2%, respectively, were found in the biocathode chamber. The co-existence of AOBs and anammox bacteria in the NiA mox MDC cathode was confirmed. Thus, bioelectrochemical nitritation-anammox approach has been shown to be a synergistic solution for resource-efficient wastewater treatment.

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Section: Resultscontrasting

confidence: 54%

Co-existing Anammox, Ammonium-Oxidizing, and Nitrite-Oxidizing Bacteria in Biocathode-Biofilms Enable Energy-Efficient Nitrogen Removal in a Bioelectrochemical Desalination Process

Ghimire

Gude

Smith

et al. 2021

ACS Sustainable Chem. Eng.

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“…Electrode material and electrode surface area are important parameters which affect the MDC performance in terms of desalination efficiency, energy production, and wastewater treatment (Wang et al, 2013). Carbon felt, carbon brush, activated carbon cloth, carbon cloth, graphite brush embedded in graphite granules, and graphite paper are commonly used electrode materials in MDC set-ups due to their high stability, conductivity, and low cost (Cao et al, 2009;Pant et al, 2010;Ragab et al, 2019). However, none of the published studies investigated the effect of electrode surface area on MDC performance.…”

Section: Effect Of Electrode Surface Areamentioning

confidence: 99%

Energy production from treatment of industrial wastewater and boron removal in aqueous solutions using microbial desalination cell

Gören

Ökten

2021

Chemosphere

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“…47 Recently, carbon-based materials have been employed as electrode materials in biochemical degradation processes as they are superconductive, environmentally benign, and nontoxic. 48 To our best knowledge, there is limited study covering the electrochemical removal of MB from water using commercially available flexible graphite, which is a low-cost, highly conductive, and stable electrode material. This is the most comprehensive study to date on the electrochemical removal of MB from water using flexible graphite electrodes.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation

et al. 2022

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In this study, electrochemical removal of methylene blue (MB) from water using commercially available and low-cost flexible graphite was investigated. The operating conditions such as initial dye concentration, initial solution pH, electrolyte dose, electrical potential, and operating time were investigated. The Box-Behnken experimental design (BBD) was used to optimize the system’s performance with the minimum number of tests possible, as well as to examine the independent variables’ impact on the removal efficiency, energy consumption, operating cost, and effluent MB concentration. The electrical potential and electrolyte dosage both improved the MB removal efficiency, since increased electrical potential facilitated production of oxidizing agents and increase in electrolyte dosage translated into an increase in electrical current transfer. As expected, MB removal efficiency increased with longer operational periods. The combined effects of operating time–electrical potential and electrical potential–electrolyte concentration improved the MB removal efficiency. The maximum removal efficiency (99.9%) and lowest operating cost (0.012 $/m 3 ) were obtained for initial pH 4, initial MB concentration 26.5 mg/L, electrolyte concentration 0.6 g/L, electrical potential 3 V, and operating time 30 min. The reaction kinetics was maximum for pH 5, and as the pH increased the reaction rates decreased. Consequent techno-economic assessment showed that electrochemical removal of MB using low-cost and versatile flexible graphite had a competitive advantage.

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Simultaneous power generation and pollutant removals using microbial desalination cell at variable operation modes

Cited by 37 publications

References 32 publications

Co-existing Anammox, Ammonium-Oxidizing, and Nitrite-Oxidizing Bacteria in Biocathode-Biofilms Enable Energy-Efficient Nitrogen Removal in a Bioelectrochemical Desalination Process

Co-existing Anammox, Ammonium-Oxidizing, and Nitrite-Oxidizing Bacteria in Biocathode-Biofilms Enable Energy-Efficient Nitrogen Removal in a Bioelectrochemical Desalination Process

Energy production from treatment of industrial wastewater and boron removal in aqueous solutions using microbial desalination cell

Electrochemical Degradation of Methylene Blue by a Flexible Graphite Electrode: Techno-Economic Evaluation

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