Variable kinetic approach to modelling an industrial waste anaerobic digester

López, Iván; Passeggi, Mauricio; Borzacconi, Liliana

doi:10.1016/j.bej.2014.12.014

Cited by 9 publications

(9 citation statements)

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“…However, it should be noted that TPS is characterized by strong variations in terms of solid and pollutant content, due to López et al (2015) performed batch biodegradability test for a mixture of ruminal content, TF and thickened secondary sludge generated in a WWTP treating oil factory wastewater, in a volumetric ratio of 4:2:1, obtaining 0.487 ± 37 CH 4 /kgVS rem . Concerning modeling results, curves on acetate simulations (Figures 2, 3) clearly indicate model high sensitivity to the initial biomass concentration at controlled conditions and not limiting concentrations for substrate.…”

Section: Discussionmentioning

confidence: 99%

“…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%

“…In developing countries, where tanning industry plays a prominent role within the local economy, AD turns very attractive to handle the massive waste production due to the relevant reduction of solids to be disposed and possible pay-back in terms of energy/heat production. Some of the reported studies on AD of tannery wastes refer to industrial districts in Asia (Vasudevan and Ravindran, 2007;Thangamani et al, 2010;Sri Bala Kameswari et al, 2014), Latin America (López et al, 2015;Ruiz-Aguilar et al, 2015;Priebe et al, 2016) and Northern Africa (Zerdani et al, 2004). The majority of this works were oriented toward codigestion of untanned solid wastes with other organic substrates in order to face/prevent possible problems of unbalanced C/N ratio as well as inhibitory conditions from ammonia, long chain fatty acids and sulfide accumulation (Dhayalan et al, 2007;Shanmugam and Horan, 2009;Zupancic and Jemec, 2010;Giaccherini et al, 2016).…”

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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%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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

Polizzi

Alatriste‐Mondragón

Munz

2017

Front. Environ. Sci.

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“…Na literatura, diversas pesquisas usam esta metodologia para predizer a composição do sistema para a queima de diferentes combustíveis [2][3][4][5][6][7]. A cinética é definida como a ciência que estuda a velocidade das reações químicas dos processos e os fatores que as influenciam.…”

Section: Metodologia Cinéticaunclassified

“…Onde, G -energia livre de Gibbs total do sistema fechado; µi,j -potencial químico do componente i na fase j; ni,j -número de mols do componente i na fase j. O potencial químico da espécie i na fase j é descrita pela Equação (2).…”

Section: Metodologia Da Minimização Da Energia Livre De Gibbsunclassified

Proposta de emprego de conceitos de equilíbrio químico na descrição matemática da câmara de combustão de caldeira siderúrgica

Turetta¹,

Costa²

2015

Anais Do VI Encontro Científico De Física Aplicada

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The effect of various pre‐treatment methods of chromium leather shavings in continuous biogas production

Gomes

Repke

Meyer

2019

Engineering in Life Sciences

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During leather manufacture, high amounts of chromium shavings, wet by‐products of the leather industry, are produced worldwide. They are stable towards temperatures of up to 110°C and enzymatic degradation, preventing anaerobic digestion in a biogas plant. Hitherto, chromium shavings are not utilized industrially to produce biogas. In order to ease enzymatic degradation, necessary to produce biogas, a previous denaturation of the native structure has to be carried out. In our projects, chromium shavings were pre‐treated thermally and mechanically by extrusion and hydrothermal methods. In previous works, we intensively studied the use of these shavings to produce biogas in batch scale and significant improvement was reached when using pre‐treated shavings. In this work, a scale‐up of the process was performed in a continuous reactor using pre‐treated and untreated chromium shavings to examine the feasibility of the considered method. Measuring different parameters along the anaerobic digestion, namely organic matter, collagen content, and volatile fatty acids content, it was possible to show that a higher methane production can be reached and a higher loading rate can be used when feeding the reactor with pre‐treated shavings instead of untreated chromium shavings, which means a more economical and efficient process in an industrial scenario.

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Variable kinetic approach to modelling an industrial waste anaerobic digester

Cited by 9 publications

References 37 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

Proposta de emprego de conceitos de equilíbrio químico na descrição matemática da câmara de combustão de caldeira siderúrgica

The effect of various pre‐treatment methods of chromium leather shavings in continuous biogas production

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