scholarly journals Ammonium as a Carbon-Free Electron and Proton Source in Microbial Electrosynthesis Processes

2020 ◽  
Vol 12 (8) ◽  
pp. 3081 ◽  
Author(s):  
Vasan Sivalingam ◽  
Carlos Dinamarca ◽  
Gamunu Samarakoon ◽  
Dietmar Winkler ◽  
Rune Bakke
Keyword(s):  
Co2 Reduction ◽  
Organic Substances ◽  
Energy Research ◽  
Biogas Upgrading ◽  
Microbial Electrosynthesis ◽  
Proton Source ◽  
Biomethane Production ◽  
Anodic Reactions ◽  
By Products ◽  
Opinion Article

Biogas upgrading to biomethane with microbial electrosynthesis (MES) is receiving much attention due to increasing biomethane demands and surplus renewable energy. Research has demonstrated the feasibility of MES to increase methane yield by reducing CO2 in anaerobic digestion (AD). Such CO2 reduction occurs at the cathode and requires the supply of both protons and electrons. The most studied sources of protons and electrons are oxidation of organic substances and water, generated at the anode. These anodic reactions, however, also imply the production of CO2 and O2, respectively, both with negative implications for the AD process. A source of protons and electrons without CO2 and O2 as by-products would be beneficial for MES-enhanced biomethane production. This opinion article discusses the possibility of ammonium to serve as a sustainable proton and electron source.

Bioplastic Production from the Microbial Electrosynthesis of Acetate through CO2 Reduction

2021 ◽  
Vol 35 (19) ◽  
pp. 15978-15986
Author(s):  
Kang Zhang ◽  
Yonghang Zhou ◽  
Tianshun Song ◽  
Jingjing Xie
Keyword(s):  
Co2 Reduction ◽  
Microbial Electrosynthesis

Recent Trends in Biogas Upgrading Technologies for Biomethane Production

2020 ◽  
pp. 239-281
Author(s):  
B. S. Dhanya ◽  
Dhruv Singh ◽  
Asim Kumar Jana ◽  
Anjani Kumar Dwiwedi ◽  
Ashok Kumar Sharma ◽  
...  
Keyword(s):  
Biogas Upgrading ◽  
Recent Trends ◽  
Biomethane Production

A local proton source from carboxylic acid functionalized metal porphyrins for enhanced electrocatalytic CO2 reduction

2020 ◽  
Vol 44 (37) ◽  
pp. 16062-16068
Author(s):  
Yiwei Zhou ◽  
Yunheng Xiao ◽  
Jian Zhao
Keyword(s):  
Carboxylic Acid ◽  
Benzoic Acid ◽  
Co2 Reduction ◽  
Proton Donor ◽  
Propanoic Acid ◽  
Metal Porphyrins ◽  
Proton Source

Metal tetraphenylporphyrin modified through the introduction of propanoic acid into the phenyl groups as a local proton donor exhibits higher CO2 electrocatalytic conversion to CO than benzoic acid.

Photochemical Properties of Re(CO)3 Complexes with and without a Local Proton Source and Implications for CO2 Reduction Catalysis

2020 ◽  
Vol 39 (13) ◽  
pp. 2405-2414
Author(s):  
Lucas A. Paul ◽  
Nico C. Röttcher ◽  
Jennifer Zimara ◽  
Jan-Hendrik Borter ◽  
Jia-Pei Du ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Proton Source ◽  
Photochemical Properties

Dairy Waste Treatment and Utilization

2020 ◽  
pp. 160-182
Author(s):  
Anum Ishaq ◽  
Ubaid ur Rahman ◽  
Muhammad Haseeb Ahmad ◽  
Amna Sahar ◽  
Qamar Abbas Syed ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Waste Treatment ◽  
Dairy Industry ◽  
Waste Materials ◽  
Organic Substances ◽  
Proper Treatment ◽  
Aquatic Resources ◽  
Waste Products ◽  
Dairy Waste ◽  
By Products

The dairy industry produces waste materials and by-products including soluble and suspended organic substances, wastewater, suspended solids, and whey. These substances contain significant amounts of organic and inorganic toxins that can cause serious health threats if not treated properly. Additionally, toxins produced by dairy waste would negatively affect the environment as well as quality and availability of aquatic resources. However, these waste materials and by-products can be utilized in different ways after proper treatment and processing. This chapter will provide an overview of waste products of dairy industries and highlight different treatments and utilization of these by-products in other industries.

scholarly journals A local proton source in a [Mn(bpy-R)(CO)3Br]-type redox catalyst enables CO2 reduction even in the absence of Brønsted acids

2014 ◽  
Vol 50 (93) ◽  
pp. 14670-14673 ◽  
Author(s):  
Federico Franco ◽  
Claudio Cometto ◽  
Federico Ferrero Vallana ◽  
Fabrizio Sordello ◽  
Emanuele Priola ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Co2 Reduction ◽  
Homogeneous Solution ◽  
Bronsted Acids ◽  
Redox Catalyst ◽  
Proton Source

A novel bromotricarbonyl Mn(i) complex with a local proton source shows strong redox catalytic properties in acetonitrile homogeneous solution even in the absence of Brønsted acids.

scholarly journals Enhanced CO2 Conversion to Acetate through Microbial Electrosynthesis (MES) by Continuous Headspace Gas Recirculation

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3297 ◽  
Author(s):  
Raúl Mateos ◽  
Ana Sotres ◽  
Raúl M. Alonso ◽  
Antonio Morán ◽  
Adrián Escapa
Keyword(s):  
Co2 Fixation ◽  
High Throughput Sequencing ◽  
Co2 Reduction ◽  
Electrical Energy ◽  
Reactor Performance ◽  
Microbial Electrosynthesis ◽  
Novel Technologies ◽  
Acetogenic Bacteria ◽  
Headspace Gas ◽  
Gas Recirculation

Bioelectrochemical systems (BESs) is a term that encompasses a group of novel technologies able to interconvert electrical energy and chemical energy by means of a bioelectroactive biofilm. Microbial electrosynthesis (MES) systems, which branch off from BESs, are able to convert CO2 into valuable organic chemicals and fuels. This study demonstrates that CO2 reduction in MES systems can be enhanced by enriching the inoculum and improving CO2 availability to the biofilm. The proposed system is proven to be a repetitive, efficient, and selective way of consuming CO2 for the production of acetic acid, showing cathodic efficiencies of over 55% and CO2 conversions of over 80%. Continuous recirculation of the gas headspace through the catholyte allowed for a 44% improvement in performance, achieving CO2 fixation rates of 171 mL CO2 L−1·d−1, a maximum daily acetate production rate of 261 mg HAc·L−1·d−1, and a maximum acetate titer of 1957 mg·L−1. High-throughput sequencing revealed that CO2 reduction was mainly driven by a mixed-culture biocathode, in which Sporomusa and Clostridium, both bioelectrochemical acetogenic bacteria, were identified together with other species such as Desulfovibrio, Pseudomonas, Arcobacter, Acinetobacter or Sulfurospirillum, which are usually found in cathodic biofilms. Moreover, results suggest that these communities are responsible of maintaining a stable reactor performance.

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