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Sustainability 2014, 6(12), 8348-8363; doi:10.3390/su6128348

The Effect of Substrate-Bulk Interaction on Hydrolysis Modeling in Anaerobic Digestion Process

1
Telematic University Pegaso, piazza Trieste e Trento 48, 80132 Naples, Italy
2
Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy
3
Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via Di Biasio 43, 03043 Cassino (FR), Italy
4
Department of Mathematics and Applications Renato Caccioppoli, University of Naples Federico II, via Cintia, Monte S. Angelo, I-80126 Naples, Italy
*
Author to whom correspondence should be addressed.
Received: 9 September 2014 / Revised: 5 November 2014 / Accepted: 12 November 2014 / Published: 25 November 2014
(This article belongs to the Special Issue Sustainability of Resources)
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Abstract

In an Anaerobic Digestion (AD) process treating particulate substrates, the size of solids is expected to negatively affect the rate of hydrolysis step and consequently influence the performance of the whole process. To avoid any disadvantage due to size of solids, expensive pre-treatments aimed at disintegrating and solubilizing substrates are commonly conducted prior to AD. This practice is doubtlessly successful, but not always necessary, since some organic substrates, although particulate, once immersed in water, tend to solubilize immediately. This aspect, if properly considered, could result in saving money and time in the AD process, as well as refining the development and calibration of AD mathematical models. The present study is actually aimed at demonstrating, through experiments and mathematical simulations, different results deriving from the AD process performed, under the same operating conditions, on two different substrates, i.e. homemade pasta and carrot batons, having the same particle size, but different chemical composition and texture. Experimental outcomes highlighted the effect of particles size on bio-methane production only from the bio-methanation potential tests (BMP) conducted on carrot batons. Similar results were obtained by mathematical model calibration, i.e., different kinetic constants for differently-sized carrot batons and same kinetic constant for differently-sized homemade pasta solids. View Full-Text
Keywords: bio-methane; anaerobic digestion; hydrolysis; mathematical modelling bio-methane; anaerobic digestion; hydrolysis; mathematical modelling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Panico, A.; d'Antonio, G.; Esposito, G.; Frunzo, L.; Iodice, P.; Pirozzi, F. The Effect of Substrate-Bulk Interaction on Hydrolysis Modeling in Anaerobic Digestion Process. Sustainability 2014, 6, 8348-8363.

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