Hydrogen and Methane Generation from Biowaste: Enhancement and Upgrading via Bioelectrochemical Systems

2020 ◽  
pp. 83-130
Author(s):  
Bo Wang ◽  
Wenzong Liu ◽  
Cristiano Varrone ◽  
Zhe Yu ◽  
Aijie Wang
Keyword(s):  
Bioelectrochemical Systems ◽  
Methane Generation

scholarly journals Synergistic Effect of Magnetite and Bioelectrochemical Systems on Anaerobic Digestion

2021 ◽  
Vol 8 (12) ◽  
pp. 198
Author(s):  
Nhlanganiso Ivan Madondo ◽  
Emmanuel Kweinor Tetteh ◽  
Sudesh Rathilal ◽  
Babatunde Femi Bakare
Keyword(s):  
Anaerobic Digestion ◽  
Synergistic Effect ◽  
Suspended Solids ◽  
Industrial Effluent ◽  
Oxygen Demand ◽  
Electrolysis Cell ◽  
Bioelectrochemical Systems ◽  
Methane Generation ◽  
Copper Electrodes ◽  
Great Possibility

Conventionally, the anaerobic digestion of industrial effluent to biogas constitutes less than 65% methane, which warrants its potential methanation to mitigate carbon dioxide and other anthropogenic gas emissions. The performance of the anaerobic digestion process can be enhanced by improving biochemical activities. The aim of this study was to examine the synergistic effect of the magnetite and bioelectrochemical systems (BES) on anaerobic digestion by comparing four digesters, namely a microbial fuel cell (MFC), microbial electrolysis cell (MEC), MEC with 1 g of magnetite nanoparticles (MECM), and a control digester with only sewage sludge (500 mL) and inoculum (300 mL). The MFC digester was equipped with zinc and copper electrodes including a 100 Ω resistor, whereas the MEC was supplied with 0.4 V on the electrodes. The MECM digester performed better as it improved microbial activity, increased the content of methane (by 43% compared to 41% of the control), and reduced contaminants (carbon oxygen demand, phosphates, colour, turbidity, total suspended solids, and total organic carbon) by more than 81.9%. Current density (jmax = 25.0 mA/m2) and electrical conductivity (275 µS/cm) were also high. The prospects of combining magnetite and bioelectrochemical systems seem very promising as they showed a great possibility for use in bioelectrochemical methane generation and wastewater treatment.

Methane generation during anaerobic fermentation of four livestock slurries

2010 ◽  
Vol 18 (3) ◽  
pp. 632-636
Author(s):  
Jin-Cai SHI ◽  
Xin-Di LIAO ◽  
Yin-Bao WU
Keyword(s):  
Anaerobic Fermentation ◽  
Methane Generation

Increased Stability of Anaerobic Digestion by Controlled Recirculation

1991 ◽  
Vol 23 (7-9) ◽  
pp. 1229-1237
Author(s):  
Chaio-Fuei Ouyang ◽  
Tain-Gen Chang
Keyword(s):  
Substantial Reduction ◽  
Gas Production ◽  
Digested Sludge ◽  
Significant Saving ◽  
Methane Generation ◽  
Sludge Digestion ◽  
Solids Concentration ◽  
Secondary Sludge ◽  
Sludge Recycling ◽  
Growth System

The treatment characteristics of municipal sludge were investigated by the anaerobic activated sludge digestion (AASD) system. This study used the suspended growth system and mesophilic temperature in the digestors and separators; the system achieves a more stable and improved process; such a process configuration offers the possibility of a substantial reduction in the total volume necessary for efficient stabilization. This study presents data indicating that the AASS system is feasible. In general, with an applied solids concentration of TS= 2%, the nonbiodegradable portion of the substrate concentration contained in the primary and secondary sludge was found to be 40.6% and 35.1% on the basis or TVS and COD, respectively. This study also provides evidence that the reactions at a recycling ratio of R=1 and R=3 are considerably more stable than those achieved in conventional or other recycling ratio digestors with a HRT of 9 days or longer. The gas production and bioactivity is also higher than that normally produced by the conventional single-stage digestion system. The experimental results also indicate that the dilution rate exceeds the maximum specific growth rate as the HRT is decreased from 9 days to 6 days. The significant saving in reactor volume and enhanced methane generation should offset the energy required for digested sludge recycling.

scholarly journals How to balance the voltage in serially stacked bioelectrochemical systems

2021 ◽  
Vol 491 ◽  
pp. 229576
Author(s):  
Daniele Molognoni ◽  
Pau Bosch-Jimenez ◽  
Jordi Suarez ◽  
Monica Della Pirriera ◽  
Eduard Borràs
Keyword(s):  
Bioelectrochemical Systems

Abiotic methane generation through reduction of serpentinite-hosted dolomite: implications for carbon mobility in subduction zones

2021 ◽  
Author(s):  
Weigang Peng ◽  
Lifei Zhang ◽  
Simone Tumiati ◽  
Alberto Vitale Brovarone ◽  
Han Hu ◽  
...  
Keyword(s):  
Subduction Zones ◽  
Methane Generation ◽  
Abiotic Methane

scholarly journals Status Update on Bioelectrochemical Systems: Prospects for Carbon Electrode Design and Scale-Up

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 278
Author(s):  
Katharina Herkendell
Keyword(s):  
Gradual Increase ◽  
Scale Up ◽  
Value Added ◽  
Biofuel Cells ◽  
Carbon Electrode ◽  
Electrode Design ◽  
Bioelectrochemical Systems ◽  
Electrode Assemblies ◽  
The Stability ◽  
Scientific Attention

Bioelectrochemical systems (BES) employ enzymes, subcellular structures or whole electroactive microorganisms as biocatalysts for energy conversion purposes, such as the electrosynthesis of value-added chemicals and power generation in biofuel cells. From a bioelectrode engineering viewpoint, customizable nanostructured carbonaceous matrices have recently received considerable scientific attention as promising electrode supports due to their unique properties attractive to bioelectronics devices. This review demonstrates the latest advances in the application of nano- and micro-structured carbon electrode assemblies in BES. Specifically, in view of the gradual increase in the commercial applicability of these systems, we aim to address the stability and scalability of different BES designs and to highlight their potential roles in a circular bioeconomy.

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