Assessment of different mechanical treatments for improving the anaerobic biodegradability of residual raspberry extrudate

Does seasonality of feedstock affect anaerobic digestion?

“…According to Atelge et al [47], the negative effect on anaerobic digestion of lignocellulosic material can be enhanced by applying a decrease in particle size. Using a particle size reduction process would increase the availability of microorganisms and provide a higher specific surface area of the substrates, thus enhancing methane production [27]. As previously reported by Jain et al [21] and Rocamora et al [22], and corroborated in the present research, particle size can positively or negatively affect methane production depending on the composition of the waste or waste mixture.…”

“…This behavior could be due to the hydrolysis stage being often accelerated by providing a pre-treatment to the substrates [13]. The increase in specific surface area due to a reduction in particle size improved the accessibility of the microorganisms to the substrate and, thus, facilitated microbial activity [27]. Similar results were also obtained with other organic solid wastes; i.e., the methane production rate improved with decreasing particle size.…”

“…Three different particle sizes have been studied, i.e., 4, 6, and 10 mm, due to the previously reported relation between the particle size and the variation of the anaerobic digestion behavior [27]. For that, the FVW mixtures were chopped to the desired particle size in the laboratory.…”

“…Due to NaOH property of chemically absorbing the CO 2 present in the biogas, a correct methane volume measurement can be obtained by liquid displacement. Based on methane production, the biodegradability was calculated against the theoretical maximum methane production that would be stoichiometrically produced, i.e., 1 g COD = 382 mL CH 4 at 25 °C and 1 atm [27].…”

Acid Hydrothermal Amendment of Grape Wine Pomace: Enhancement of Phenol and Carbohydrate Co-solubilization

“…Hydrothermal treatments have been widely proposed as a cost-effective option for the solubilization of lignocellulosic substrates [7,23]. However, the application of excessively severe conditions during the hydrothermal treatment would entail the degradation of a fraction of the bioactive compounds and sugars in the substrate, as well as the appearance of undesirable compounds, such as furfural or hydroxymethylfurfural (HMF) [24]. These compounds have been reported to be biological inhibitors and would struggle the further valorization of the substrate after the recovery of the bioactive compounds [25].…”