Influence of a Conductive Material and Different Anaerobic Inocula on Biochemical Methane Potential of Substrates from A
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ORIGINAL PAPER
Influence of a Conductive Material and Different Anaerobic Inocula on Biochemical Methane Potential of Substrates from Alcoholic Beverage Production David Valero1 · Liliana Alzate‑Gaviria1 · Jesús A. Montes2 · Carlos Rico2 Received: 12 June 2019 / Accepted: 23 September 2019 © Springer Nature B.V. 2019
Abstract 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 SY, allowing to reach biochemical methane potential values between 657–699 L C H4 kg−1 VS and it reduced redox potential from − 368 to − 398 mV. The activated carbon did not improve the methane yields from whisky PA since microorganisms did not have difficulties to process this substrate; in fact, the redox potential slightly increased from − 355 to − 330 mV. Graphic Abstract
Powdered ac vated Carbon (PAC)
Brewery spent yeast
Whisky pot ale
Posi ve effect of PAC on BMP
Nega ve effect of PAC on BMP
BMP 677 ± 21 L CH4 kg-1 VS
BMP 448 ± 48 L CH4 kg-1 VS
Inoculum + Substrate
BMP 339 ± 292 L CH4 kg-1 VS
BMP 544 ± 11 L CH4 kg-1 VS
Inoculum + Substrate
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Vol.:(0123456789)
Waste and Biomass Valorization
Keywords Biochemical methane potential (BMP) · Powdered activated carbon (PAC) · Direct interspecies electron transfer (DIET) · Anaerobic digestion · Whiskey pot ale · Brewery spent yeast
Statement of Novelty The main novelty of the work is the use of different types of inocula to analyse the effect of the conductive material on the process. To the best of our knowledge there are no previous works in the literature that had performed a similar study. The most important finding is the high methane yield obtained for the brewery spent yeast enhanced by the powdered activated carbon. It is the highest value that can be found in the literature which has been induced by the action of the powdered activated carbon.
Introduction The production of alcoholic beverages is one of the paramount industries around the world, as well as a very important source of organic wastes [1]. Anaerobic digestion (AD) is considered a key method for sustainable waste management and renewable energy production [2]. Anaerobic digestion is a complex process that includes four steps (hydrolysis, acidogenesis, acetogenesis, and methanogenesis) and is performed by a microbial consortia comprising both Eubacteria (hydrolytic-acidogenic bacteria) and acetogenic bacteria (acetogens) and Archaea (hydrogenutilising methano
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