Enhanced methane production from wool textile residues by thermal and enzymatic pretreatment

Kabir, Maryam M.; Forgács, Gergely; Horváth, Ilona Sárvári

doi:10.1016/j.procbio.2013.02.029

Cited by 34 publications

(11 citation statements)

References 19 publications

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“…Enzymes involved in the hydrolysis of cellulose-rich materials have difficulty to access the structure, especially in the case of lignocelluloses, making the process slow. In order to improve the accessibility providing higher methane yield and increasing biodegradation rate, some pretreatments (chemical, physical, and enzymatic) have been used to open up the structure and to disrupt cellulose crystallinity [24,[94][95][96][97][98][99]. For example, methane yields reaching up to 88% of the theoretical values have been achieved after a chemical pretreatment using Nmethylmorpholine-N-oxide pretreatment on barley straw [100].…”

Section: Effect Of Lignocellulosic Materials (Lcm) On the Biodegradabmentioning

confidence: 99%

Anaerobic Biodegradation of Solid Substrates from Agroindustrial Activities — Slaughterhouse Wastes and Agrowastes

Reyes¹,

Díaz²,

Horváth³

2015

Biodegradation and Bioremediation of Polluted Systems - New Advances and Technologies

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Solid wastes from the meat industry are produced in large amounts resulting in a negative impact on the environment if not properly treated. Due to their high content of proteins and fats, these residues are excellent substrates for anaerobic digestion which holds high potential for methane yield. However, possible toxic compounds may be formed during its biodegradation with a consequent failure of the process under long-term operation. The anaerobic co-digestion of such residues with other co-substrates as those generated in agricultural activities has been proposed as a good alternative to overcome these problems. Nevertheless, today there is very little knowledge to assess on mixture interactions connected to wastes composition, biodegradability, and the kinetics of the anaerobic process when complex materials are utilized in ternary and quaternary mixture, specifically when co-digesting solid cattle slaughterhouse waste with agrowaste. It is therefore important to select the right combination of substrates and ratios to obtain synergy instead of antagonism in those mixtures. This chapter aims to provide an overview of the anaerobic digestion of solid slaughterhouse waste and agrowaste, as well as the influence of mixture interactions on its biodegradation.Keywords: "growaste, anaerobic digestion, co-digestion, synergy, slaughterhouse waste © 2015 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. . IntroductionThe agriculture sector belongs to one of the most important human activities, but at the same time, it is considered as one of the most residue-producing sector in the world. Farmer activities have a huge impact on the environment, and moreover, industries related to agriculture, such as the meat processing industry, generate a large amount of high-strength residues. Due to the growing demand of meat in the world, the amount of organic solid wastes from meat producing industries is increasing every day. There are several attempts to improve the biodegradation of such residues, such as the anaerobic process, the preferred technology to diminish the organic load with an adequate efficiency [ -]. It is well known that anaerobic digestion "D provides both environmental solutions and renewable energy production in rural areas, in most cases, with the corresponding autonomy."ecause of the high content of proteins and fats, slaughterhouse residues are holding high biogas potential and hence are interesting for the anaerobic digestion process. However, potential inhibitory compounds can be formed during the degradation of proteins and lipids, which make this process sensitive and prone to fail [ -]. " possible way to overcome these problems is the co-digestion with carbon-rich co-substrates, i.e., a mixture of agrowastes with low protein/lipid content. This will lead ...

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Section: Effect Of Lignocellulosic Materials (Lcm) On the Biodegradabmentioning

confidence: 99%

Anaerobic Biodegradation of Solid Substrates from Agroindustrial Activities — Slaughterhouse Wastes and Agrowastes

Reyes¹,

Díaz²,

Horváth³

2015

Biodegradation and Bioremediation of Polluted Systems - New Advances and Technologies

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“…However, the addition of the protein-degrading enzyme could significantly enhance the methane production at the TS contents of 6 and 13%, resulting in 0.108 and 0.131 Nm 3 CH4/kg VS, respectively. Previously, in a wet-AD system and at thermophilic conditions, only 5% of the expected theoretical yield from the protein fraction of similar textile waste could be achieved (i.e., 0.020 m 3 CH4/kg VS) (Kabir et al, 2013). While in the present study, the degradation of wool textile waste in the dry-AD mode resulted in 3 and 6.5 times higher methane yields, without and with the addition of a protein-degrading enzyme, respectively.…”

Section: Anaerobic Digestion Of Wool Textile Wastementioning

confidence: 99%

Dry anaerobic digestion of lignocellulosic and protein residues

2015

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HIGHLIGHTSAD digestion/co-digestion of wool and wheat straw were evaluated with TS contents of between 6 to 30%.Methane yield of wheat straw was highest at TS of 21% and lowest at TS of 30%.Methane yield of wool textile was highest at TS of 13% and lowest at TS of 30%.The addition of enzyme on wool and wheat straw led to improvement in methane yield at TS of 13%.Synergetic effects were observed when these substrates were co-digested. Utilisation of wheat straw and wool textile waste in dry anaerobic digestion (AD) process was investigated. Dry-AD of the individual substrates as well as co-digestion of those were evaluated using different total solid (TS) contents ranging between 6 to 30%. Additionally, the effects of the addition of nutrients and cellulose-or protein-degrading enzymes on the performance of the AD process were also investigated. Dry-AD of the wheat straw resulted in methane yields of 0.081 -0.200 Nm 3 CH4/kgVS with the lowest and highest values obtained at 30 and 21% TS, respectively. The addition of the cellulolytic enzymes could significantly increase the yield in the reactor containing 13% TS (0.231 Nm 3 CH4/kg VS). Likewise, degradation of wool textile waste was enhanced significantly at TS of 13% with the addition of the protein-degrading enzyme (0.131 Nm 3 CH4/kg VS). Furthermore, the co-digestion of these two substrates showed higher methane yields compared with the methane potentials calculated for the individual fractions at all the investigated TS contents due to synergetic effects and better nutritional balance. © 2015 BRTeam. All rights reserved. Kabir et al. / Biofuel Research Journal 8 (2015) [309][310][311][312][313][314][315][316] Please cite this article as: Kabir M.M., Taherzadeh M.J., Sárvári Horváth I. Dry anaerobic digestion of lignocellulosic and protein residues. ARTICLE INFO ABSTRACT

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“…Wool is natural fibre material obtained majorly by shearing sheep and generally used in the textile manufacturing. The world textile industry has largely amplified the production due to the increasing global need for manmade fibres estimated from 52.6 million tonnes in year 2000 to 70.5 million tonnes in 2009 and surpassed the volume of 100 million tonnes in 2016, where wool is 1.56% from the total world fibre production [ 1 , 2 , 3 ]. The sheep population in the European Union (EU) area is constantly increasing and now is the second largest, amounted to about 90.4 million, with the majority of the sheep located in the United Kingdom (UK) [4] .…”

Section: Introductionmentioning

confidence: 99%

“…Its structure also contains a large amount of sulphur containing amino acid cysteine, which further limits its biodegradability. Consequently, only limited investigation on the anaerobic digestibility of wool has been reported [ 1 , 10 , 11 ], and reported studies have been mainly on chemical or enzymatic pre-treatment. Combined thermal and enzymatic pre-treatment of wool materials and fabrics followed by thermophilic anaerobic digestion have been reported to deliver up to 20 times higher methane yield than untreated samples [1] , whilst thermal treatment alone presented a considerable lower methane yields [10] .…”

Section: Introductionmentioning

confidence: 99%

Effect of liquid nitrogen pre-treatment on various types of wool waste fibres for biogas production

Kuzmanova

Zhelev

Akunna

2018

Heliyon

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This study investigated the role of liquid nitrogen (LN2) in increasing microbial accessibility of wool proteins for biogas production. It involves a mechanical size reduction of four different types of raw wool fibres, namely, Blackface, Bluefaced Leicester, Texel and Scotch Mule, in presence of liquid nitrogen, followed by the determination of the methane production potential of the pre-treated wool fibres. The highest methane yield, 157.3 cm3 g−1 VS, was obtained from pre-treated Scotch mule wool fibre culture, and represented more than 80% increase when compared to the yield obtained from its raw equivalent culture. The increase in biogas yield was attributed to the effectiveness of LN2 in enhancing particle size reduction and the consequent increase in wool solubility and bioavailability. Results also showed that LN2 pre-treatment can enhance size reduction but has limited effect on the molecular structure. The study also showed that the biogas potential of waste wool fibres varies with the type and source of wool.

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Enhanced methane production from wool textile residues by thermal and enzymatic pretreatment

Cited by 34 publications

References 19 publications

Anaerobic Biodegradation of Solid Substrates from Agroindustrial Activities — Slaughterhouse Wastes and Agrowastes

Anaerobic Biodegradation of Solid Substrates from Agroindustrial Activities — Slaughterhouse Wastes and Agrowastes

Dry anaerobic digestion of lignocellulosic and protein residues

Effect of liquid nitrogen pre-treatment on various types of wool waste fibres for biogas production

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