Making lignin accessible for anaerobic digestion by wet-explosion pretreatment

Ahring, Birgitte Kiær; Biswas, Rajib; Ahamed, Aftab; Teller, Philip J.; Uellendahl, Hinrich

doi:10.1016/j.biortech.2014.10.082

Cited by 92 publications

(44 citation statements)

References 28 publications

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“…1, acetic acid was the predominant VFA produced during the HTP, while all of the other VFAs were minimal, and pentanoic acid was only found in treatments at temperatures above 200 °C. This result was consistent with the previous relative findings reported by Ahring et al (2014) and Di Girolamo et al (2013). The acetic acid produced in the pretreatment was positively correlated with the hemicellulose content in the biomass, which was due to the release of the acetyl groups bonded to the chains of hemicellulose (Kaparaju et al 2009).…”

Section: Hydrolysate Composition Volatile Fatty Acidssupporting

confidence: 92%

Enhanced Biogas Yield of Chinese Herbal Medicine Extraction Residue by Hydrothermal Pretreatment

Wang

Zhang²,

Yan

et al. 2017

BioResources

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aChinese herbal medicine extraction residue (CHER) is a special organic waste produced in China. Because of the high content of lignocelluloses, CHER have a weak bioconversion efficiency for bio-products production. This study investigates the effect of a hydrothermal pretreatment (HTP, 140 to 220 °C, 15 min) on the organic matter solubilisation, biochemical methane potential, and methanation kinetics of CHER during anaerobic digestion (AD). The AD test was conducted with 5 g/L total solid at 35 °C for 30 d. The results showed that the HTP clearly improved the solubilisation of CHER, and the obtained soluble COD (%) reached over 30% (only 4.5% in untreated). Acetic acid, xylose, and glucose were found to be the main products in the hydrolysate. The methane yield and methanation speed of the treated CHER were also enhanced. The highest methane yield of 306 mL/g volatile solid was achieved at a HTP temperature of 180 °C, while the untreated control was only 175 mL/g VS. Moreover, a carbonisation phenomenon was observed at HTP temperatures over 200 °C, which resulted in a loss of organic matter and methane yield.

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Section: Hydrolysate Composition Volatile Fatty Acidssupporting

confidence: 92%

Enhanced Biogas Yield of Chinese Herbal Medicine Extraction Residue by Hydrothermal Pretreatment

Wang

Zhang²,

Yan

et al. 2017

BioResources

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“…Lignin mainly consists of aromatic compounds and, due to its complex structure, is highly resistant to enzymatic and microbial action. However, recent studies have shown anaerobic digestibility of wet exploded lignin, resulting in increased methane production through conversion of around 44.4 wt % lignin in the pretreated material [42]. This study also found production of several phenolic compounds and fatty acids in the effluent after anaerobic digestion, which is an indication of the complexities of the fermentation broth, while designing separation processes fitted to produce carboxylic acid as the final product.…”

Section: Challenges and Considerations For The Production Of Carboxylmentioning

confidence: 69%

“…The biochemical pathway for converting sugar substrates to different carboxylic acids is shown in Figure 1. wt % lignin in the pretreated material [42]. This study also found production of several phenolic compounds and fatty acids in the effluent after anaerobic digestion, which is an indication of the complexities of the fermentation broth, while designing separation processes fitted to produce carboxylic acid as the final product.…”

Section: Biochemical Routes To Carboxylic Acid Productionmentioning

confidence: 86%

Biochemical Production and Separation of Carboxylic Acids for Biorefinery Applications

2017

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Carboxylic acids are traditionally produced from fossil fuels and have significant applications in the chemical, pharmaceutical, food, and fuel industries. Significant progress has been made in replacing such fossil fuel sources used for production of carboxylic acids with sustainable and renewable biomass resources. However, the merits and demerits of each carboxylic acid processing platform are dependent on the application of the final product in the industry. There are a number of studies that indicate that separation processes account for over 30% of the total processing costs in such processes. This review focuses on the sustainable processing of biomass resources to produce carboxylic acids. The primary focus of the review will be on a discussion of and comparison between existing biochemical processes for producing lower-chain fatty acids such as acetic-, propionic-, butyric-, and lactic acids. The significance of these acids stems from the recent progress in catalytic upgrading to produce biofuels apart from the current applications of the carboxylic acids in the food, pharmaceutical, and plastics sectors. A significant part of the review will discuss current state-of-art of techniques for separation and purification of these acids from fermentation broths for further downstream processing to produce high-value products.

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“…Thomsen et al (2008) used wheat straw processed by hydrothermal treatment in a three-step reactor and obtained 3.9 g L À1 acetic acid, reported as being generated from the cellulose and hemicellulose fraction. Ahring et al (2015) used pretreated wheat straw by steam explosion and subjected this wheat straw to anaerobic degradation, yielding 3.2 g L À1 butyric acid. However, the authors did not clarify the origins of the cellulose, hemicellulose, or aromatic fractions.…”

Section: Methodsmentioning

confidence: 99%

Production of short-chain fatty acids from the biodegradation of wheat straw lignin by Aspergillus fumigatus

Baltierra-Trejo

Sanchez–Yáñez

Buenrostro-Delgado

et al. 2015

Bioresource Technology

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Making lignin accessible for anaerobic digestion by wet-explosion pretreatment

Cited by 92 publications

References 28 publications

Enhanced Biogas Yield of Chinese Herbal Medicine Extraction Residue by Hydrothermal Pretreatment

Enhanced Biogas Yield of Chinese Herbal Medicine Extraction Residue by Hydrothermal Pretreatment

Biochemical Production and Separation of Carboxylic Acids for Biorefinery Applications

Production of short-chain fatty acids from the biodegradation of wheat straw lignin by Aspergillus fumigatus

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