Increase of anaerobic degradation of particulate organic matter in full-scale biogas plants by mechanical maceration

Hartmann, Hinrich; Angelidaki, Irini; Ahring, Birgitte Kiær

doi:10.2166/wst.2000.0066

Cited by 156 publications

(61 citation statements)

References 8 publications

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“…However, a number of studies have investigated pretreatment methods that specifically aim to increase the methane yield of recalcitrant biomass. Size reduction (maceration) of manure fibers led to an increase of 25% [5]. Also, 23% and 30% improvement was achieved with chemical and biological treatment of manure, respectively .…”

Section: Introductionmentioning

confidence: 96%

Improving Anaerobic Digestion of Wheat Straw by Plasma-Assisted Pretreatment

Heiske

Schultz-Jensen

Leipold

et al. 2013

Journal of Atomic and Molecular Physics

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Plasma-assisted pretreatment (PAP) of lignocellulosic biomass has been shown to be an efficient method to decompose lignin and consequently facilitate microbial access to cellulose and hemicellulose. In the present study, PAP was tested for its suitability to enhance bioconversion of wheat straw to methane. In thermophilic batch experiments, methane yields of up to 366 mL/g volatile solids (VSs) were achieved, accounting for a yield increase of 45%. Common lignin-derived inhibitors like 5-hydroxymethylfurfural (5-HMF) and furfural were not detected after PAP, but toxicity test resulted in lower methane yields at higher substrate concentrations, indicating the presence of other unidentified inhibitors. However, in a continuous lab-scale biogas reactor experiment, stable codigestion of cattle manure with 20% PAP wheat straw was demonstrated, while no signs of adverse effects on the anaerobic digestion process were observed. After the introduction of the pretreated wheat straw to the reactor, volatile fatty acid concentrations remained low and stable, while gas production increased. In co-digestion, the PAP wheat straw was converted at an average yield of 343 mL CH 4 /gVS.

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Section: Introductionmentioning

confidence: 96%

Improving Anaerobic Digestion of Wheat Straw by Plasma-Assisted Pretreatment

Heiske

Schultz-Jensen

Leipold

et al. 2013

Journal of Atomic and Molecular Physics

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“…Hartmann et al [21] tested the mechanical maceration of manure and found a 25 % increase on biogas production while the resulted increase was insignificant when only raw manure fibers were treated. Raphique et al [22] tested a thermal, a thermochemical and a chemical [with Ca(OH) 2 )] pretreatment of raw manure fibers and reported a 28 %, a 72 % and a negative increase of CH 4 yield respectively.…”

Section: Resultsmentioning

confidence: 99%

AMMONOX: Ammonia for Enhancing Biogas Yield and Reducing NOx—Analysis of Effects of Aqueous Ammonia Soaking on Manure Fibers

Lymperatou

Gavala

Esbensen

et al. 2015

Waste Biomass Valor

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Laboratory experiments have shown that aqueous ammonia soaking (AAS) is a promising treatment for increasing the methane yield of the solid fraction of manure (fibers). AMMONOX is a new concept based on the sustainable use of ammonia for enhancing biogas production at biogas plants digesting manure. The proposed process is based on an optimized AAS treatment of manure fibers in combination with an efficient ammonia recovery step. The enhancement of biogas production is achieved by enriching manure with AAS-treated fibers, or other lignocellulosic residues, while the ammonia recovered can be used for fulfilling the needs of the treatment itself. Excess of ammonia could be produced when ammonia is recovered from both the treated fibers and the digester effluent, which could be used for the reduction of NO x in biogasbased electricity generation by gas turbines. In this survey study, the importance of different factors affecting the performance of AAS of digested manure fibers was investigated in order to conclude on which variables to optimize. Principal component analysis of the present data was used for a preliminary analysis of effects. The temperature and the ammonia concentration during AAS were the most influencing variables in terms of methane yield under the conditions tested. Further experiments should be conducted in order to investigate the effect of shorter AAS duration than the ones tested (lower than 24 h) and for assessing the importance of the solid-to-liquid ratio in the treatment mixture; the follow-up campaign should be optimized with respect to possible interactions/correlated experimental factor effects.

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“…Hartmann et al (2000), discovered that while steeping the feedstocks, shearing effect played crucial role in increasing the gas production to the cutting of substrate fiber. In another reported study, the cell structure of the substrate was interrupted by sonication (Elliott and Mahmood, 2007).…”

Section: Mechanical Treatmentmentioning

confidence: 99%