Enhancement of Anaerobic Digestion with Nanomaterials: A Mini Review

Barrena, Raquel; Moral‐Vico, Javier; Font, Xavier; Sánchez, Antoni

doi:10.3390/en15145087

Cited by 10 publications

(3 citation statements)

References 65 publications

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“…The highest emissions of methane, which is one of the most important greenhouse gases, accompany, to a large extent, the extraction of fossil fuels [1], the management of waste and wastewater, the decomposition of manure, and the combustion of biomass and biofuels. Anaerobic digestion (AD) is one of the most practical approaches constituting an alternative energy source to fossil fuel extraction [2,3]. It is also a well-tested strategy for managing agricultural and food waste.…”

Section: Introductionmentioning

confidence: 99%

Polylactide (PLA) as a Cell Carrier in Mesophilic Anaerobic Digestion—A New Strategy in the Management of PLA

et al. 2022

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The management of waste polylactide (PLA) in various solutions of thermophilic anaerobic digestion (AD) is problematic and often uneconomical. This paper proposes a different approach to the use of PLA in mesophilic AD, used more commonly on the industrial scale, which consists of assigning the function of a microbial carrier to the biopolymer. The study involved the testing of waste wafers and waste wafers and cheese in a co-substrate system, combined with digested sewage sludge. The experiment was conducted on a laboratory scale, in a batch bioreactor mode. They were used as test samples and as samples with the addition of a carrier: WF—control and WFC—control; WF + PLA and WFC + PLA. The main objective of the study was to verify the impact of PLA in the granular (PLAG) and powder (PLAP) forms on the stability and efficiency of the process. The results of the analysis of physicochemical properties of the carriers, including the critical thermal analysis by differential scanning calorimetry (DSC), as well as the amount of cellular biomass of Bacillus amyloliquefaciens obtained in a culture with the addition of the tested PLAG and PLAP, confirmed that PLA can be an effective cell carrier in mesophilic AD. The addition of PLAG produced better results for bacterial proliferation than the addition of powdered PLA. The highest level of dehydrogenase activity was maintained in the WFC + PLAG system. An increase in the volume of the methane produced for the samples digested with the PLA granules carrier was registered in the study. It went up by c.a. 26% for WF, from 356.11 m3 Mg−1 VS (WF—control) to 448.84 m3 Mg−1 VS (WF + PLAG), and for WFC, from 413.46 m3 Mg−1 VS, (WFC—control) to 519.98 m3 Mg−1 VS (WFC + PLAG).

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Section: Introductionmentioning

confidence: 99%

Polylactide (PLA) as a Cell Carrier in Mesophilic Anaerobic Digestion—A New Strategy in the Management of PLA

et al. 2022

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“…In recent years, anaerobic digestion has undergone an unprecedented boost due to the search of renewable and locally-available sources of energy. , This increase has derived in the implementation of new anaerobic digesters, the search for additives to improve methane yield, such as biochar or nanomaterials, and a considerable number of recent publications on biogas upgrading research . Unfortunately, this boost has not been accompanied by a similar increment either in implementation or in research to find alternative ways to valorize the other product of anaerobic digestion: digestate.…”

Section: Role Of Solid-state Fermentation In Biorefineriesmentioning

confidence: 99%

A Perspective of Solid-State Fermentation As Emergent Technology for Organic Waste Management in the Framework of Circular Bioeconomy

Sánchez

2024

ACS Sustainable Resour. Manage.

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Among the different technologies to treat and valorize organic waste, solid-state fermentation (SSF) is gaining relevance in recent years as it permits the recovery of valuable biomaterials from waste, changing the paradigm: “from waste to raw material source”. SSF is very similar to composting, as it implies the aerobic biodegradation of organic solid waste, but with the objective of obtaining bioproducts in some point of the process, although a compost-like end product may be also produced. Also, SSF can be coupled with anaerobic digestion, as solid digested materials can act as substrates for SSF, with a double benefit: renewable bioenergy and bioproducts. Among these bioproducts, SSF has moved from classical biotechnological compounds (enzymes or antibiotics) to more complex biomaterials, such as biopesticides, bioplastics, biosurfactants, or biostimulants, among others, which are now an emergent field of research and one of the main objectives of SSF. In summary, it is evident that SSF will have a predominant role in the framework of circular bioeconomy and in novel biorefineries for biowaste and wastewater sludge valorization, although some challenges still need further research (scale-up and down-stream).

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“…Anaerobic digestion is a natural process that results in the production of biogas that can be a useful source of renewable energy. The production of methane from biogas has been reviewed from the point of view of operational strategies (Komilis et al, 2017) and the use of additives to increase the amount of biogas and its content in methane (Barrena et al, 2022). Methane, being the major component of natural gas, is a useful renewable source of energy when it comes from biogas.…”

Section: Introductionmentioning

confidence: 99%

Biogas improvement as renewable energy through conversion into methanol: A perspective of new catalysts based on nanomaterials and metal organic frameworks

Sánchez

2022

Front. Nanotechnol.

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In recent years, the high cost and availability of energy sources have boosted the implementation of strategies to obtain different types of renewable energy. Among them, methane contained in biogas from anaerobic digestion has gained special relevance, since it also permits the management of a big amount of organic waste and the capture and long-term storage of carbon. However, methane from biogas presents some problems as energy source: 1) it is a gas, so its storage is costly and complex, 2) it is not pure, being carbon dioxide the main by-product of anaerobic digestion (30%–50%), 3) it is explosive with oxygen under some conditions and 4) it has a high global warming potential (27–30 times that of carbon dioxide). Consequently, the conversion of biogas to methanol is as an attractive way to overcome these problems. This process implies the conversion of both methane and carbon dioxide into methanol in one oxidation and one reduction reaction, respectively. In this dual system, the use of effective and selective catalysts for both reactions is a critical issue. In this regard, nanomaterials embedded in metal organic frameworks have been recently tested for both reactions, with very satisfactory results when compared to traditional materials. In this review paper, the recent configurations of catalysts including nanoparticles as active catalysts and metal organic frameworks as support materials are reviewed and discussed. The main challenges for the future development of this technology are also highlighted, that is, its cost in environmental and economic terms for its development at commercial scale.

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Enhancement of Anaerobic Digestion with Nanomaterials: A Mini Review

Cited by 10 publications

References 65 publications

Polylactide (PLA) as a Cell Carrier in Mesophilic Anaerobic Digestion—A New Strategy in the Management of PLA

Polylactide (PLA) as a Cell Carrier in Mesophilic Anaerobic Digestion—A New Strategy in the Management of PLA

A Perspective of Solid-State Fermentation As Emergent Technology for Organic Waste Management in the Framework of Circular Bioeconomy

Biogas improvement as renewable energy through conversion into methanol: A perspective of new catalysts based on nanomaterials and metal organic frameworks

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