Kinetic modelling of anaerobic hydrolysis of solid wastes, including disintegration processes

In the food industry, the brewing sector holds a strategic economic position: in the year 2013, the beer production of the EU-28 was equal to 383,553,000 hL. The brewing process includes chemical and biochemical reactions and solid-liquid separations, involving the generation of various residues and by-products, among which the major two fractions are brewer's spent grain (BSG), and exhausted brewery yeast (BY). Although until today their main use has been for animal feed, in recent years, several studies have investigated the application of anaerobic digestion in order to revalue the brewery wastes.In this work, specific methane production (SMP) and first-order solubilisation (disintegration + hydrolysis) rates (k sol ) for BSG and BY were evaluated. Biomethanation tests were performed in 5-L fed-batch stirred reactors at several substrate/inoculum ratios.

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“…These low values were selected to reduce the reaction times 22,32 allowing to maintain a biomass with good activity 22 . …”

Section: Experimental Set-upmentioning

confidence: 99%

Biovalorization of Brewery Waste by Applying Anaerobic Digestion

Vitanza

Cortesi

Gallo

et al. 2016

Chem.Biochem.Eng.Q.

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“…In addition to the methane potential, a BMP test may provide useful information with regard to the degradation kinetics of a material (García-Gen et al, 2015;Linke, 2006). The degradation kinetics are often considered to be more sensitive to the experimental conditions compared to the methane potential, as it is highly dependent on the microbial activity and substrate accessibility (Jensen et al, 2011).…”

Section: Kinetic Evaluationmentioning

confidence: 99%

Effects of substrate concentration on methane potential and degradation kinetics in batch anaerobic digestion

Wang

Strömberg

et al. 2015

Bioresource Technology

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“…The procedure adopted for the calibration of the rapidly and slowly hydrolysable fractions for X c on the base of observed differences on methane production rates is in line with other works presented in the literature (Yasui et al, 2008;Mottet et al, 2013;García-Gen et al, 2015). It ought to be considered that such an approach tends to overestimate the rapid fraction, as the biogas produced in the high-rate phase is actually the result of the degradation of both rapidly and slowly hydrolysable fractions.…”

Section: Discussionmentioning

confidence: 73%

“…Model modifications of Model 3 are comparable to those proposed by García-Gen et al (2015), who applied a 1st order kinetic to rapidly and slowly hydrolysable fractions for different organic substrates, mainly fruit and vegetable wastes but also fish-derived waste (protein-rich) and oil-derived wastes (fat-rich). The reported values of 1.4-1.7 and 60 d -1 for the disintegration rate, k dis_slow and k dis_rapid , respectively, are higher than those obtained in our work.…”

Section: Discussionmentioning

confidence: 85%

Modeling the Disintegration Process in Anaerobic Digestion of Tannery Sludge and Fleshing

Polizzi

Alatriste‐Mondragón

Munz

2017

Front. Environ. Sci.

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Mathematical modeling of anaerobic digestion (AD) is widely acknowledged as a powerful tool to v of the process and to support full-scale plant design, operation and optimization. In this work, a modified version of the IWA-ADM1 model is proposed to simulate the AD of tannery primary sludge (TPS) and fleshing, with special emphasis on the disintegration formulation. Multiple batch tests were performed at different inoculum/substrate VS-mass ratio, in order to evaluate the biodegradability of the two substrates and to provide experimental data for modeling purposes. Beside the necessary adjustments of substrates' COD fractionation, the structure modifications of the model focused on the disintegration and hydrolysis. The Contois Monod-based model was adopted to describe disintegration kinetics and the results were compared to the traditionally adopted first-order kinetic. The fate of particulate matter generated from biomass lysis was also questioned and a new model variable was introduced to account for cellular lysis products. Finally, a further modification differentiated substrate particulate matter into a readily and a slowly hydrolysable fraction. Batch tests confirmed that TPS and fleshing are suitable substrates for AD, exhibiting specific methane productions of: 0.26 ± 0.06 and 0.47 ± 0.05 Nm 3 Kg −1 VS, respectively. Modeling results showed that the proposed modifications were crucial for successful simulation of experimental data referring to fleshing, whereas did not have a significant effect on the results related to primary sludge degradation. This work is the first application of an IWA-ADM1-based model to AD of tannery waste.Keywords: anaerobic digestion, tannery waste, modeling, ADM1, hydrolysis INTRODUCTIONLeather industry comprises a chain of processes required to transform raw animal hides into the finished product. A large amount of tannery wastewater and of solid waste is generated throughout the process, especially in the highly water-demanding pre-tanning phases. Dedicated wastewater treatment plants are often conceived to treat tannery pollutant load, characterized by high concentrations of organic matter (including recalcitrant compounds), ammoniacal nitrogen, sulfide and salts (Mannucci et al., 2010). Tannery fleshing (TF) represents the main solid waste; it originates from the removal of animal tissue from the raw hide, usually after liming process (de-haring phase). Tannery primary sludge (TPS) and TF has been traditionally disposed in landfill or incinerated. In the last decades, new stringent regulations and environmental policies Polizzi et al. Modeling Anaerobic Digestion of Tannery Wastehave been encouraging alternative eco-friendly treatments, worldwide. Among them, anaerobic digestion (AD) has been acknowledged as a valuable solution for the treatment of a wide variety of organic waste, whose multiple advantages range from waste volume reduction to renewable energy production and cost-effective management. AD of tannery-originated wastes found its first applications in the late...

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Kinetic modelling of anaerobic hydrolysis of solid wastes, including disintegration processes

Cited by 60 publications

References 17 publications

Biovalorization of Brewery Waste by Applying Anaerobic Digestion

Biovalorization of Brewery Waste by Applying Anaerobic Digestion

Effects of substrate concentration on methane potential and degradation kinetics in batch anaerobic digestion

Modeling the Disintegration Process in Anaerobic Digestion of Tannery Sludge and Fleshing

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