Batch anaerobic digestion of deproteinated malt whisky pot ale using different source inocula

Barrena, Raquel; Traub, Julio Enrique; Gil, Cristina Rodriguez; Goodwin, J.A.S.; Harper, Alan; Willoughby, Nicholas; Sánchez, Antoni; Aspray, Thomas J.

doi:10.1016/j.wasman.2017.06.025

Cited by 30 publications

(21 citation statements)

References 26 publications

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“…12 in Table 8) over 21 days of digestion period was achieved for samples subjected to alkaline and subsequent 7.5 min beating pre-treatments; seeded with 1:1 sludge ratio on wet basis at 35 (for pot ale) and 38 • C (for pot ale and spent grain) digestion temperature. A methane yield of 554 ± 67 mL/g vs. was reported by [70] with AD of non-treated pot ale with a substrate inoculum ratio of 1:2 (on wet basis) at lab scale batch experiments, while in this study the highest methane yield was found as 322 ± 4 mL/g vs. (Table 3) by AD of alkaline and 7.5 min beating pre-treated pot ale with a substrate to inoculum ratio of 1:1. The difference between the two yields was attributed to the lower inoculum ratio in the experiments as the reactor configurations and alkali conditions were similar in both works.…”

Section: Discussionmentioning

confidence: 94%

Optimisation and Modelling of Anaerobic Digestion of Whiskey Distillery/Brewery Wastes after Combined Chemical and Mechanical Pre-Treatment

et al. 2020

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Whiskey distillery waste streams consisting of pot ale (liquid residue) and spent grain (solid residue) are high strength organic wastes and suitable feedstock for anaerobic digestion (AD) from both economic and environmental stand points. Anaerobic digestion of pot ale and pot ale/spent grain mixtures (with mixing ratios of 1:1, 1:3, and 1:5 by wet weight) was performed after implementation of a novel hybrid pre-treatment (combined chemical and mechanical) in order to modify lignocellulosic structure and ultimately enhance digestion yield. Lignin, hemicellulose, and cellulose fractions were determined before and after chemical pre-treatment. Effects of different inoculum rates (10-30-50% on wet basis) and beating times (0-7.5-15 min) on anaerobic digestion of pot ale alone and of pot ale/spent grain mixtures were investigated in lab scale batch mode with a major focus of optimising biogas yield by using response surface methodology (RSM) in Design Expert Software. The highest biogas yields of 629 ± 8.5 mL/g vs. (51.3% CH 4 ) and 360 ± 10 mL/g vs. (55.0 ± 0.4) with anaerobic digestion of pot ale alone and spent grain mix after 1M NaOH and 7.5 min beating pre-treatments with 50% inoculum ratio respectively. The optimum digestion conditions to maximise the biogas quality and quantity were predicted as 10 and 13 min beating times and 32 and 38 • C digestion temperatures for anaerobic digestion of pot ale alone and spent grain mix respectively.Processes 2020, 8, 492 2 of 27 of alternative energy sources has arisen [5]. Among the renewable energy sources, biogas, which is methane rich gas produced by anaerobic digestion (AD) of organic waste, is considered to be among the most environmentally friendly fuel sources [6] owing to its non-toxic characteristics and potential for simplicity of use as an alternative over traditional fossil fuels, as well as its potential reduction in wastes sent to landfill [7].Typical waste disposal levels of whiskey distilleries and breweries and the potential environmental concerns associated with those waste streams was outlined by [8]. Due to the high organic content, large disposal volume, and the acidic nature, pot ale is the major concern of the waste management of whiskey distilleries. As such, AD with advantages over other waste management methods like low energy requirement, odour limitation, less by-product generation, and higher ability to cope with recalcitrant nature of whiskey distillery/brewery waste streams is a suitable alternative waste treatment method [9][10][11][12]. There are four main stages in the AD process-namely hydrolysis, acidogenesis, acetogenesis, and methanogenesis-and the reactions in each stage are carried out by different bacteria. The thermodynamics of each AD stage and potential bacterial competitions have been reported in detail by [13,14]. In order to have a balanced AD, identical reaction rates are desired, however, the hydrolysis step is considered to be the rate limiting step for the digestion of lignocellulosic matter due to the impact of high lig...

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Section: Discussionmentioning

confidence: 94%

Optimisation and Modelling of Anaerobic Digestion of Whiskey Distillery/Brewery Wastes after Combined Chemical and Mechanical Pre-Treatment

et al. 2020

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“…The biomethane potential was analyzed as described elsewhere (Barrena et al, 2018). Inoculum was collected in the wastewater treatment plant (Sabadell, Barcelona), contained 2.8% dry solids and 65.5% volatile solids, and was mixed in to the fermented solids in an inoculum to substrate ratio of 2:1 based on the volatile solid.…”

Section: Methodsmentioning

confidence: 99%

Sophorolipids Production from Oil Cake by Solid-State Fermentation. Inventory for Economic and Environmental Assessment

2021

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Biosurfactants are being proposed as a substitute for surfactants in the framework of a circular economy strategy. Sophorolipids (SL) are a type of biosurfactant produced by yeast that can be produced through submerged or solid-state fermentation (SSF) processes. Even though sophorolipids are being produced at full scale, through submerged fermentations, environmental and technoeconomic information regarding its production through SSF is unavailable. An inventory of data necessary to perform preliminary economic and environmental assessments is presented in this study. Data was obtained from three SSF processes at 22-L reactor volume and from two SSF processes at 100-L reactor volume, using winterization oil cake and molasses as substrates, wheat straw as support material, and Starmerella bombicola as SL producing yeast. The effect of increasing the operation scale was assessed. Besides presenting parameters such as inoculum production, initial mass of substrates, and airflow requirements; process emissions (NH3, Volatile Organic Compounds, N2O, SH2 and CH4) and the biogas potential of the spent fermentation solids were also presented.

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“…In this sense, the literature reports two problematic types of organic wastes proceeding from the alcoholic beverage industry that creates difficulties for its anaerobic digestion: whisky pot ale and brewery spent yeast. Barrena et al [7] justified this limited successful uptake due to problems associated with the high COD (Chemical Oxygen Demand), yeast cells (which sink to the bottom of reactors), inorganic salts, protein (which causes ammonia inhibition) and wide variety of organic compounds including unfermented sugars, that make an stable long term digestion process difficult to achieve [7,8]. Sosa-Hernández et al [9] and Zupančič et al [10] related inhibition problems in the batch anaerobic digestion of brewery spent yeast that resulted in very low methane yield values, which were attributed to the bactericide properties of hops extract.…”

Section: Introductionmentioning

confidence: 99%

Influence of a Conductive Material and Different Anaerobic Inocula on Biochemical Methane Potential of Substrates from Alcoholic Beverage Production

Valero

Alzate‐Gaviria

Montes

et al. 2019

Waste Biomass Valor

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The impact of a conductive material as powdered activated carbon (PAC) on the biochemical methane potential of whisky pot ale (PA) and brewery spent yeast (SY) was investigated. The test was carried out with three different types of anaerobic inocula: manure inoculum (MI), sewage sludge (SS) and granular sludge (GR). Brewery spent yeast produced partial (in sewage and granular sludge) and total (in manure inoculum) methanogenesis inhibition due to the toxicity of some of its constituents (hops extract). The inhibition was overcome by the supplementation of PAC, that improved significantly the anaerobic digestion process for spent yeast, allowing to reach biochemical methane potential values between 657-699 L CH4 kg-1 VS and it reduced redox potential from −368 mV to −398 mV. The activated carbon did not improve the methane yields from whisky pot ale since microorganisms did not have difficulties to process this substrate; in fact, the redox potential slightly increased from-355 mV to-330 mV.

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Batch anaerobic digestion of deproteinated malt whisky pot ale using different source inocula

Cited by 30 publications

References 26 publications

Optimisation and Modelling of Anaerobic Digestion of Whiskey Distillery/Brewery Wastes after Combined Chemical and Mechanical Pre-Treatment

Optimisation and Modelling of Anaerobic Digestion of Whiskey Distillery/Brewery Wastes after Combined Chemical and Mechanical Pre-Treatment

Sophorolipids Production from Oil Cake by Solid-State Fermentation. Inventory for Economic and Environmental Assessment

Influence of a Conductive Material and Different Anaerobic Inocula on Biochemical Methane Potential of Substrates from Alcoholic Beverage Production

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