Simplified hydrolysis models for the optimal design of two-stage anaerobic digestion

Вавилин, В.А.; Rytov, S.V.; Lokshina, L. Ya.; Rintala, Jukka; Lyberatos, Gérasimos

doi:10.1016/s0043-1354(01)00148-8

Cited by 50 publications

(33 citation statements)

References 10 publications

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“…López et al (2015) modeled batch test results on TF and a mixture of TF, ruminal content and secondary sludge, by applying a simplified model for methane production laying on the basic assumption of hydrolysis as limiting step similarly to what proposed in Vavilin et al (2001). A unique 1st order kinetic with respect to particulate substrate was successfully adopted to account for the overall degradation rate of AD processes, instead of the more complex ADM1.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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

Polizzi

Alatriste‐Mondragón

Munz

2017

Front. Environ. Sci.

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“…hydrolysis, acid fermentation, acetogenesis and methanogenesis) of anaerobic digestion takes place in one vessel and hence high HRT is maintained (Kelleher et al 2002;Salminen and Rintal 2002a;Suleyman Sakar et al 2009;Benjamin et al 2001;Gangagni Rao et al 2008a, b, 2011Keri et al 2008;Mata-Alvarez et al 2000). This would create favorable environment for the mixed culture of organisms in a single reactor in order to balance volatile acid production and utilization rates (Vavilin et al 2001;Banks and Wang 1999;Wang and Charles 2003). Otherwise, at low HRT, volatile acid production could exceed the utilization, leading to digester failure (Gangagni Rao et al 2008a;Mata-Alvarez et al 2000;Demirel and Yenigun 2002;Banks and Wang 1999;Wang and Charles 2003).…”

Section: Biomethanation Of Poultry Litter In High Rate Digestersmentioning

confidence: 99%

“…The claimed advantages of phase separation are increased stability with better control of acid phase, higher organic loading rate, increased specific activity of methanogens leading to an increase in methane production rates and increased overall chemical oxygen demand (COD) and volatile solids (VS) reduction efficiencies (Gangagni Rao et al 2008a;Mata-Alvarez et al 2000;Demirel and Yenigun 2002;Vavilin et al 2001;Banks and Wang 1999;Wang and Charles 2003;Raynal et al 1998). The speculated disadvantages of phase separation include hydrogen build-up in the first-phase reactor that could inhibit the acid producing bacteria and elimination of possible interdependent nutritional requirements of acid and methane formers (Gangagni Rao et al 2008a;Mata-Alvarez et al 2000;Demirel and Yenigun 2002;Vavilin et al 2001;Banks and Wang 1999;Wang and Charles 2003;Raynal et al 1998). In another model, hydrolysis, acidogenesis, acetogenesis and methanogenic steps are carried out in separate reactors (Kelleher et al 2002;Salminen and Rintal 2002a;Suleyman Sakar et al 2009;Benjamin et al 2001;Gangagni Rao et al 2008a, b, 2011Keri et al 2008;Mata-Alvarez et al 2000;Vavilin et al 2001;Banks and Wang 1999;Wang and Charles 2003) depending on the characteristics of organic solid waste.…”

Section: Biomethanation Of Poultry Litter In High Rate Digestersmentioning

confidence: 99%

Biogas from Poultry Litter: A Review on Recent Technological Advancements

Anupoju

Ahuja²,

Gandu

et al. 2015

Advances in Bioprocess Technology

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“…Hydrolysis in the AD process of organic waste has been widely studied and modeled over recent years [22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Hydrolysis Concept and Its Modelingmentioning

confidence: 99%

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

et al. 2014

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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 OPEN ACCESSSustainability 2014, 6 8349 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.

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Simplified hydrolysis models for the optimal design of two-stage anaerobic digestion

Cited by 50 publications

References 10 publications

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

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

Biogas from Poultry Litter: A Review on Recent Technological Advancements

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

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