Comparative study of mechanical, hydrothermal, chemical and enzymatic treatments of digested biofibers to improve biogas production

Bruni, Emiliano; Jensen, Anders Peter; Angelidaki, Irini

doi:10.1016/j.biortech.2010.06.108

Cited by 173 publications

(106 citation statements)

References 34 publications

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“…Similar results had been obtained by Gupta and Lee [16] where AAS (different modifications of AAS treatment) was applied on switch grass. Last but not least, recent studies have shown that alkaline treatments may cause some transformation of sugars to carboxylic acids such as acetate [8]. A slight increase in acetate content had also been observed in the present study, where the concentration of acetate increased from 1.1 g· L −1 to 1.4 g· L −1 when the digested fibers treated with the highest reagent concentration in ammonia (32%).…”

Section: Effect Of Aas Treatment On Klason Lignin Sugars and Nutriensupporting

confidence: 69%

“…All these should be carried out through a cost effective and sustainable process by means of energy and power considerations [6]. Some representative pretreatments applied on fibers to enhance the methane productivity are mechanical maceration [7], hydrothermal, chemical, enzymatic [8], steam pretreatment with NaOH [9] as well as wet explosion [10].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Aqueous Ammonia Soaking on the Methane Yield and Composition of Digested Manure Fibers Applying Different Ammonia Concentrations and Treatment Durations

et al. 2014

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Abstract:The continuously increasing demand for renewable energy sources renders anaerobic digestion one of the most promising technologies for renewable energy production. Due to the animal production intensification, manure is being used as the primary feedstock for most biogas plants. Thus, their economical profitable operation relies on increasing the methane yield from manure, and especially of its solid fraction which is not so easily degradable. In the present study, aqueous ammonia soaking (AAS) at six different concentrations in ammonia (5%, 10%, 15%, 20%, 25% and 32%) and for 1, 3 and 5 days at 22 °C was applied on digested fibers separated from the effluent of a manure-fed, full-scale anaerobic digester. A methane yield increase from 76% to 104% was achieved during the first series of experiments, while the difference in reagent concentration did not considerably affect the methane yield. It was shown that the optimal duration was three days for both 5% and 25% w/w reagent concentrations in ammonia tested. Carbohydrates and phosphorus content remained unaffected, while a slight decrease in Klason lignin and non-soluble organic nitrogen content was observed after AAS. It is concluded that AAS is a very promising treatment resulting to an overall increase of the methane yield of digested manure fibers from 76% to 265% depending on the conditions and the batch of digested fibers used (an even higher increase of 190%-265% was achieved during the 2nd series of OPEN ACCESSEnergies 2014, 7 4158 experiments, where different AAS durations were tested, compared to the 1st series were different ammonia concentrations were applied).

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Section: Effect Of Aas Treatment On Klason Lignin Sugars and Nutriensupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Effect of Aqueous Ammonia Soaking on the Methane Yield and Composition of Digested Manure Fibers Applying Different Ammonia Concentrations and Treatment Durations

et al. 2014

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“…The hydrolytic (enzymatic) pretreatment is meant to increase the susceptibility of the substrate to biological degradation, increasing the rate of the methane fermentation process and the efficacy of the biogas obtained. To improve the biodegradability of the wastes, a variety of methods, such as chemical, physicochemical, biological, and combinations thereof, have been employed (Demirbas 2007;Bruni et al 2010;Karki et al 2011;Parawira 2012).…”

Section: Introductionmentioning

confidence: 99%

Characterization and Influence of a Multi-enzymatic Biopreparation for Biogas Yield Enhancement

Oszust¹,

Pawlik²,

Janusz³

et al. 2017

BioResources

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A multi-enzymatic biopreparation of Trichoderma atroviride G79/11 origin was characterized. The fungus showed relatively high cellulase production in a soybean flour-cellulose-lactose medium. Subsequently, based on its post-culture liquid, the biopreparation of the enzyme mixture was developed and characterized. The liquid form of the enzyme mixture reached 22 U cm -3 of cellulolytic activity and its lyophilisate exhibited 1.09 U cm -3 at pH 5.1 and 50 °C. The enzyme mixture was characterized by the following activities: xylanase, β-glucosidase, carboxymethyl cellulase, polygalactouronase, pectinesterase, amylase, lactase, and protease. A method for an efficient conditioning process of organic waste (fruit processing waste, dairy sewage sludge, corn silage, and grain broth) for biogas yield enhancement using the enzyme mixture was proposed. The enzyme mixture increased the efficacy of biogas production by 30% when the lyophilizate (0.5 mg g -1 d.m.) was applied prior to fermentation. A method for conducting the enzymatic conditioning process of organic waste using the enzyme mixture as a pretreatment was proposed. This was part of the optimization of the methane fermentation process to increase the biogas yield. Consequently, after application of the biopreparation, the efficiency of anaerobic digestion of organic waste was improved.

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“…Angelidaki and Ahring [24] reported a 17 % increase of biogas potential from digested manure fibers treated by mechanical maceration, and a 30 % increase when treated with a biological treatment. Bruni et al [25,26] investigated the effects of a mechanical, a chemical, a thermal and an enzymatic pretreatment of digested manure fibers and found that the most significant CH 4 increase was generated by steam treatment with H 2 SO 4 (67 % increase) and treatment with CaO (66 % increase). Finally, wet explosion of digested manure fibers resulted in a 136 % increase of CH 4 yield [27].…”

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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Comparative study of mechanical, hydrothermal, chemical and enzymatic treatments of digested biofibers to improve biogas production

Cited by 173 publications

References 34 publications

Effect of Aqueous Ammonia Soaking on the Methane Yield and Composition of Digested Manure Fibers Applying Different Ammonia Concentrations and Treatment Durations

Effect of Aqueous Ammonia Soaking on the Methane Yield and Composition of Digested Manure Fibers Applying Different Ammonia Concentrations and Treatment Durations

Characterization and Influence of a Multi-enzymatic Biopreparation for Biogas Yield Enhancement

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

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