Historical Perspective of the Addition of Magnetic Nanoparticles Into Anaerobic Digesters (2014-2021)

The addition of magnetic nanoparticles to batch anaerobic digestion was first reported in 2014. Afterwards, the number of works dealing with this subject has been increasing year by year. The discovery of the enhancement of anaerobic digestion by adding iron-based nanoparticles has created a multidisciplinary emerging research field. As a consequence, in the last years, great efforts have been made to understand the enhancement mechanisms by which magnetic nanoparticles (NPs) addition enhances the anaerobic digestion process of numerous organic wastes. Some hypotheses point to the dissolution of iron as essential iron for anaerobic digestion development, and the state of oxidation of iron NPs that can reduce organic matter to methane. The evolution and trends of this novel topic are discussed in this manuscript. Perspectives on the needed works on this topic are also presented.

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Biogas Production from Organic wastes and Iron as an Additive – A Short Review

10.20944/preprints202201.0026.v1 ◽

2022 ◽

Author(s):

Muhammad Muddasar

Keyword(s):

Anaerobic Digestion ◽

Reduction Rate ◽

Green Energy ◽

Organic Wastes ◽

World Population ◽

Biogas Yield ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

The World ◽

Iron Based

The world is facing a serious energy crisis and environmental pollution problems due to a sharp increase in the world population. Bioenergy is an eminent solution to these problems. Anaerobic digestion is a green energy technology used worldwide for the conversion of organic waste to biogas. It is reported that organic wastes are hard to digest and need some technical improvement in the anaerobic digestion process to improve biogas yield. Iron-based additives, due to their electron acceptance and donation capabilities, have been emphasized as being exceptional in improving anaerobic digestion process efficiency amongst all other enhancement options. This study reviews the major available types of iron-based additives, their characteristics, and their preparation methods. The preferred iron-based additive that has a significant effect on the enhancement of biogas yield is also discussed. The use of iron-based additives in the anaerobic digestion process with varying dosages and their impact on the biogas generation rate is also being studied. Substrates, operating parameters, and types of anaerobic digesters used in recent studies while researching the effects of iron-based additives are also part of this review. Lastly, this study also confirms that iron-based additives have a significant effect on the reduction rate of the volatile suspended solids, methane content, biogas yield, and volatile fatty acids.

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Research advances in dry anaerobic digestion process of solid organic wastes

AFRICAN JOURNAL OF BIOTECHNOLOGY ◽

10.5897/ajb11.1277 ◽

2011 ◽

Vol 10 (65) ◽

pp. 14242-14253 ◽

Cited By ~ 52

Author(s):

Kumar Jha Ajay ◽

Li Jianzheng ◽

Nies Loring ◽

Zhang Liguo

Keyword(s):

Anaerobic Digestion ◽

Organic Wastes ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Dry Anaerobic Digestion

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The relationship between the molecular composition of dissolved organic matter and bioavailability of digestate during anaerobic digestion process: Characteristics, transformation and the key molecular interval

Bioresource Technology ◽

10.1016/j.biortech.2021.125958 ◽

2021 ◽

pp. 125958

Author(s):

Xian Du ◽

Li-peng Gu ◽

Ting-ting Wang ◽

Hui-juan Kou ◽

Ying Sun

Keyword(s):

Organic Matter ◽

Anaerobic Digestion ◽

Dissolved Organic Matter ◽

Molecular Composition ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Process Characteristics ◽

The Relationship

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Upgrading of Anaerobic Digestion Processes for Night Soil

Water Science & Technology ◽

10.2166/wst.1986.0296 ◽

1986 ◽

Vol 18 (7-8) ◽

pp. 249-256 ◽

Cited By ~ 2

Author(s):

T. Noike ◽

J. Matsumoto

Keyword(s):

Anaerobic Digestion ◽

Removal Rate ◽

Field Investigation ◽

Gas Production ◽

Cod Removal ◽

Two Phase ◽

Anaerobic Digesters ◽

Anaerobic Digestion Process ◽

Digestion Process ◽

Cod Removal Rate

The upgrading of night soil anaerobic digestion processes was studied by field investigation of the performance of anaerobic digesters in existing night soil treatment plants and by serai-continuous experiments with bench-scale digesters. Both the average monthly amount of collected night soil fed to a digester and the concentration of volatile solids in night soil increased in winter. A good correlation was found to exist between gas production and digestion temperature. The COD removal rate in the first digester was markedly higher than that in the second digester. The stirring period in the first digester in one plant differs from that in the other plant. Stirring the first digester for too long a period reduces the rate of COD removal by the second digester in the two-stage anaerobic digestion process. The first digester should be stirred for more than one hour per day in order to promote gas production. Gas production and CODCr removal rate in the second digester were hardly affected by reductions in retention time ranging from 15 days to 5 days. As night soil contains a large amount of cellulose and other refractory organics, some kind of pretreatment of the night soil fed to the digester may be necessary for the promotion of acidogenesis in the two-phase anaerobic digestion process.

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