Since fossil sources for fuel and platform chemicals will become limited in the near future, it is important to develop new concepts for energy supply and production of basic reagents for chemical industry. One alternative to crude oil and fossil natural gas could be the biological conversion of CO2 or small organic molecules to methane via methanogenic archaea. This process has been known from biogas plants, but recently, new insights into the methanogenic metabolism, technical optimizations and new technology combinations were gained, which would allow moving beyond the mere conversion of biomass. In biogas plants, steps have been undertaken to increase yield and purity of the biogas, such as addition of hydrogen or metal granulate. Furthermore, the integration of electrodes led to the development of microbial electrosynthesis (MES). The idea behind this technique is to use CO2 and electrical power to generate methane via the microbial metabolism. This review summarizes the biochemical and metabolic background of methanogenesis as well as the latest technical applications of methanogens. As a result, it shall give a sufficient overview over the topic to both, biologists and engineers handling biological or bioelectrochemical methanogenesis.

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Methanogens: biochemical background and biotechnological applications.

Achievements and perspectives of anaerobic co-digestion: A review

Application of nanoparticles in biofuels: an overview

Biogas from anaerobic digestion processes: Research updates

https://opus.lib.uts.edu.au/bitstream/10453/59021/1/Accepted%20Manuscript%20Optimization%20of%20process%20parameters%20for%20VFA%2c%20H2%20and%20CH4%20from%20AD%20%28BITE%2016976%29.pdf

Optimization of process parameters for production of volatile fatty acid, biohydrogen and methane from anaerobic digestion.

Comparison of nanoparticles effects on biogas and methane production from anaerobic digestion of cattle dung slurry

Influence of zero valent iron nanoparticles and magnetic iron oxide nanoparticles on biogas and methane production from anaerobic digestion of manure

Effects of Co and Ni nanoparticles on biogas and methane production from anaerobic digestion of slurry.

This study investigated the simultaneous effects of nanoparticles (NPs) addition to rumen fluid (archaea source) and laser irradiation of the mixture on biogas production from anaerobic digestion of dairy manure. Where, the previous study reported that the addition of 2 mg L−1 nickel nanoparticles (Ni NPs) significantly (p < 0.05) increased the biogas and methane volumes by 1.74 and 2.01 times compared to the control, respectively. The results indicated that the most efficient irradiation time was 2 h laser with the addition of 2 mg L−1 Ni NPs (p < 0.05), which minimized the lag phase from 4 days to 1 day and the Hydraulic Retention Time (HRT) to attain the peak of biogas production in comparison to the control from 28 days to 16 days. The combination of laser irradiation and nanoparticles addition yielded the highest significant value of the specific biogas and methane production, compared to all treatments (incandescent light, control), which were 679.5 mL biogas g−1 VS and 453.3 mL CH4 g−1 VS. Furthermore, Laser photocatalysis of Ni NPs enhances the photo-reduction/photo-oxidation of CH4 formation pathways. Consequently, this treatment increased the biogas and methane volumes by 1.9 and 2.32 times the biogas and methane volumes resulted from the control, respectively.

Effects of Laser Irradiation and Ni Nanoparticles on Biogas Production from Anaerobic Digestion of Slurry

Anaerobic digestion is a biological process used to convert organic wastes into biogas and a stable biofertilizer for agricultural applications as environmentally friendly products. The produced biogas is used as an alternative renewable energy source. The objective of this study was to investigate the effect of the additives CoCl2, NiCl2 and FeCl3 on biogas and methane yield from fresh raw manure. A series of laboratory experiments using 2 L biodigesters were carried out in batch anaerobic mode. Each biodigester was fed with 1600 ml of slurry with individual addition of            1 mgL-1 CoCl2, 1 mgL-1 NiCl2 and 10 mgL-1 FeCl3. All of the treatments were carried out by triplication for the statistical analysis purposes, and analyzed using MStat-C software v.2.1. The results showed that the highest biogas and methane production (p CoCl2>FeCl3 in comparison with the control. These results indicated that, the addition of aforementioned salts increased biogas yield by 1.44, 1.33 and 1.17 times the biogas yielded with the control, respectively. Moreover, the methane yield was increased by 1.55, 1.43 and 1.21 times the methane yielded with the control, respectively.

https://mjae.journals.ekb.eg/article_98656_f472a5e851be676f587fe646cd98af59.pdf

M.A. Abdel-Hadi

Papers

Comparison of nanoparticles effects on biogas and methane production from anaerobic digestion of cattle dung slurry

Influence of zero valent iron nanoparticles and magnetic iron oxide nanoparticles on biogas and methane production from anaerobic digestion of manure

Effects of Co and Ni nanoparticles on biogas and methane production from anaerobic digestion of slurry.

Effects of Laser Irradiation and Ni Nanoparticles on Biogas Production from Anaerobic Digestion of Slurry

EFFECT OF CoCl2, NiCl2 AND FeCl3 ADDITIVES ON BIOGAS AND METHANE PRODUCTION