Multiphase modeling of settling and suspension in anaerobic digester

Yu, Liang; Ma, Jingwei; Frear, Craig; Zhao, Qiang; Dillon, Robert; Li, Xiujin; Chen, Shulin

doi:10.1016/j.apenergy.2013.04.073

Cited by 34 publications

(15 citation statements)

References 38 publications

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“…Owing to the intrinsic characteristics of straw, including unbalanced nutritional properties such as the carbon/nitrogen ratio (C/N), its recalcitrant lignocellulosic structure, and its tendency to float in liquid fermentation reactors [3], numerous studies have focused on nutritional regulation [4], pretreatment [5], and improvement of fermentation processes [6]. Co-digestion is considered a more cost-effective method for nutritional regulation than addition of nitrogen-containing chemical reagents such as urea or ammonium bicarbonate.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Mesophilic Codigestion of Rice Straw and Chicken Manure: Effects of Organic Loading Rate on Process Stability and Performance

Mei

Liu

Huang

et al. 2016

Appl Biochem Biotechnol

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To investigate the effects of organic loading rate (OLR) on performance and stability of mesophilic co-digestion of rice straw (RS) and chicken manure (CM), benchtop experiments (40 L) were carried out at OLRs of 3.0, 3.6, 4.2, 4.8, 6.0, 8.0, and 12.0 kg volatile solid (VS)/(m 3 ·day) with volatile solid (VS) ratio of 1:1 (RS/CM) which was based on batch tests. Anaerobic co-digestion was slightly and severely inhibited by the accumulation of ammonia when the digester was overloaded at an OLR of 6 and 12 kg VS/(m 3 ·day), respectively. The recommended OLR for codigestion is 4.8 kg VS/(m 3 ·day), which corresponds to average specific biogas production (SBP) of 380 L/kg VS and volumetric biogas production rate (VBPR) of 1.8 m 3 / (m 3 ·day). An OLR of 6-8 kg VS/(m 3 ·d) with SBP of 360-440 L/kg VS and VBPR of 2.1-3.5 m 3 /(m 3 ·day) could be considered, if an Anaerobic digestion (AD) system assisted by in situ removal of ammonia was adopted.

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Section: Introductionmentioning

confidence: 99%

Anaerobic Mesophilic Codigestion of Rice Straw and Chicken Manure: Effects of Organic Loading Rate on Process Stability and Performance

Mei

Liu

Huang

et al. 2016

Appl Biochem Biotechnol

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“…Considering the complex phenomena of particle segregation or aggregation (e.g. foaming or settling), multiphase non-Newtonian models and ADM1 model were used separately to adequately simulate the complex flow behavior of heterogeneous solid substrate (Yu et al, 2013a). Despite the higher complexity in multi-phase models than for single-phase models, a greater understanding, optimisation and commercialisation of AcoD processes can be achieved by advancing the development and application of such models in the field of AcoD (Yu et al, 2013b).…”

Section: Limitationsmentioning

confidence: 99%

Anaerobic co-digestion: A critical review of mathematical modelling for performance optimization

Xie

Hai

Zhan

et al. 2016

Bioresource Technology

207

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Anaerobic co-digestion (AcoD) is a pragmatic approach to simultaneously manage organic wastes and produce renewable energy. This review demonstrates the need for improving AcoD modelling capacities to simulate the complex physicochemical and biochemical processes. Compared to mono-digestion, AcoD is more susceptible to process instability, as it operates at a higher organic loading and significant variation in substrate composition. Data corroborated here reveal that it is essential to model the transient variation in pH and inhibitory intermediates (e.g. ammonia and organic acids) for AcoD optimization. Mechanistic models (based on the ADM1 framework) have become the norm for AcoD modelling. However, key features in current AcoD models, especially relationships between system performance and co-substrates' properties, organic loading, and inhibition mechanisms, remain underdeveloped. It is also necessary to predict biogas quantity and composition as well as biosolids quality by considering the conversion and distribution of sulfur, phosphorus, and nitrogen during AcoD.

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“…Wang et al (2010) utilizaron la metodología CFD desarrollada por Ding et al (2010) en la investigación de los mecanismos para ampliación de tamaño de los CSTRs, e indicaron que parámetros como el campo de velocidad y zonas de estancamiento necesitan ser mejorados para lograr la escala industrial. Yu et al (2013) asociaron el modelo de fluidos múltiples con la Teoría Cinética del Flujo Granular (KTGF) y el Modelo de Digestión Anaeróbica Nº 1 (ADM1) para mejorar el rendimiento de un digestor anaerobio, para el cual la sedimentación es un fenómeno muy importante para retener la biomasa. En este contexto, el objetivo de este trabajo es estudiar el comportamiento hidrodinámico de un Reactor Anaerobio Discontinuo (ASBR), mediante el empleo de la Dinámica de Fluidos Computacional (CFD).…”

Section: Introductionunclassified

Simulación de un Reactor Anaerobio Discontinuo utilizado para la Producción de Hidrógeno mediante Dinámica de Fluidos Computacional

et al. 2014

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ResumenSe ha evaluado el comportamiento hidrodinámico de un reactor de fermentación anaerobia a través de simulaciones numéricas tridimensionales, usando Dinámica de Fluidos Computacional con el software OpenFOAM ® . Se evaluaron dos condiciones de funcionamiento: una con régimen de circulación hacia abajo y otra en la dirección opuesta. Se consideró un modelo bifásico, transitorio y turbulento. Los resultados obtenidos con flujo de recirculación hacia arriba indican una optimización del proceso con este régimen. Esto implica una mayor porción turbulenta en el interior del biorreactor y una mejor mezcla sin comprometer la integridad de los gránulos. Palabras clave: dinámica de fluidos computacional (CFD), reactor anaerobio discontinuo (ASBR), hidrógeno, comportamiento hidrodinámico Simulation of an Anaerobic Sequencing batch Reactor for Hydrogen Production using Computational Fluid Dynamics AbstractThe fluid dynamic behavior of an anaerobic fermentation bioreactor through three-dimensional numerical simulations using Computational Fluid Dynamics with the software OpenFOAM ® has been studied. Two operating conditions were evaluated: one with a downward recirculating regime and another in the opposite direction. Results obtained with upward recirculating flow indicate an optimization of the process in this regime. This implies a larger turbulent region in the bioreactor and a better mixing without compromising the integrity of the flocs

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Multiphase modeling of settling and suspension in anaerobic digester

Cited by 34 publications

References 38 publications

Anaerobic Mesophilic Codigestion of Rice Straw and Chicken Manure: Effects of Organic Loading Rate on Process Stability and Performance

Anaerobic Mesophilic Codigestion of Rice Straw and Chicken Manure: Effects of Organic Loading Rate on Process Stability and Performance

Anaerobic co-digestion: A critical review of mathematical modelling for performance optimization

Simulación de un Reactor Anaerobio Discontinuo utilizado para la Producción de Hidrógeno mediante Dinámica de Fluidos Computacional

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