Coupling anaerobic digestion with gasification, pyrolysis or hydrothermal carbonization: A review

Pecchi, Matteo; Baratieri, Marco

doi:10.1016/j.rser.2019.02.003

Cited by 170 publications

(45 citation statements)

References 75 publications

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“…Hydrothermal carbonisation (HTC) involves heating in a water-environment at temperatures of 350-550 K and pressures of 2-10 MPa, and produces an aqueous liquid fraction containing water-soluble organic compounds called AHL (aqueous HTC liquids), and char which is called hydrochar. HTC benefits from not needing drying as a pre-treatment step but it requires the separation of the hydrochar from the process water [68]. In addition, the hydrochar shows a higher heating value, higher energy yield, and lower ash content than pyrolytic char produced by swine manure.…”

Section: Hydrothermal Carbonisationmentioning

confidence: 99%

Methods for the Treatment of Cattle Manure—A Review

Font-Palma

2019

108

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Environmental concerns, caused by greenhouse gases released to the atmosphere and overrunning of nutrients and pathogens to water bodies, have led to reducing direct spread onto the land of cattle manure. In addition, this practice can be a source of water and air pollution and toxicity to life by the release of undesirable heavy metals. Looking at the current practices, it is evident that most farms separate solids for recycling purposes, store slurries in large lagoons or use anaerobic digestion to produce biogas. The review explores the potential for cattle manure as an energy source due to its relatively large calorific value (HHV of 8.7–18.7 MJ/kg dry basis). This property is beneficial for thermochemical conversion processes, such as gasification and pyrolysis. This study also reviews the potential for upgrading biogas for transportation and heating use. This review discusses current cattle manure management technologies—biological treatment and thermochemical conversion processes—and the diverse physical and chemical properties due to the differences in farm practices.

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Section: Hydrothermal Carbonisationmentioning

confidence: 99%

Methods for the Treatment of Cattle Manure—A Review

Font-Palma

2019

108

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“…There are also uncertainties regarding the eco-toxicity of digestate derived pyrolysis liquids [26], including pyrochar and hydrochar [27,28]. Pilot scale investigations of low temperature gasification of anaerobically digested materials also produce solids with high nutrient content [29,30] which have better energy recoveries. However the char is also enriched with high levels of ash [31] and potentially contain enriched levels of contaminants, including polycyclic aromatic hydrocarbons (PAH), making its application challenging, especially with feedstocks with high moisture content [32].…”

Section: Introductionmentioning

confidence: 99%

Integration of Hydrothermal Carbonisation with Anaerobic Digestion; Opportunities for Valorisation of Digestate

Parmar

Ross

2019

Energies

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Hydrothermal carbonisation (HTC) has been identified as a potential route for digestate enhancement producing a solid hydrochar and a process water rich in organic carbon. This study compares the treatment of four dissimilar digestates from anaerobic digestion (AD) of agricultural residue (AGR); sewage sludge (SS); residual municipal solid waste (MSW), and vegetable, garden, and fruit waste (VGF). HTC experiments were performed at 150, 200 and 250 °C for 1 h using 10%, 20%, and 30% solid loadings of a fixed water mass. The effect of temperature and solid loading to the properties of biocoal and biochemical methane potential (BMP) of process waters are investigated. Results show that the behaviour of digestate during HTC is feedstock dependent and the hydrochar produced is a poor-quality solid fuel. The AGR digestate produced the greatest higher heating value (HHV) of 24 MJ/kg, however its biocoal properties are poor due to slagging and fouling propensities. The SS digestate process water produced the highest amount of biogas at 200 °C and 30% solid loading. This study concludes that solely treating digestate via HTC enhances biogas production and that hydrochar be investigated for its use as a soil amender.

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“…In practice, organic municipal waste gasification technologies have varying productivity, syngas purity and CO:H 2 ratios (Watson et al, 2018). Anaerobic digestion can be integrated with gasification to provide further benefits (Pecchi and Baratieri, 2019). For example, digestates from anaerobic digestion can be used as the feedstock for gasification, or, the biochar co-produced in gasification can be used to stabilise anaerobic digestion and improve nutrient retention in the digestate for fertilising applications.…”

Section: Anaerobic Digestionmentioning

confidence: 99%

The significance of biomass in a circular economy

Sherwood

2020

Bioresource Technology

286

107

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Coupling anaerobic digestion with gasification, pyrolysis or hydrothermal carbonization: A review

Cited by 170 publications

References 75 publications

Methods for the Treatment of Cattle Manure—A Review

Methods for the Treatment of Cattle Manure—A Review

Integration of Hydrothermal Carbonisation with Anaerobic Digestion; Opportunities for Valorisation of Digestate

The significance of biomass in a circular economy

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