Food waste treatment through anaerobic co-digestion: Effects of mixing intensity on the thermohydraulic performance and methane production of a liquid recirculation digester

Ibrahimi, Mohammed El; Khay, Ismail; Maâkoul, Anas El; Bakhouya, Mohamed

doi:10.1016/j.psep.2021.01.027

Cited by 17 publications

(8 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Few researches were carried out on the rheology of solid waste such as food waste. However, anaerobic digestion of food waste is worthwhile and growing interest [1, [89][90][91]. In addition, the impact of hydrodynamics on the performances of anaerobic digestion of high-solid waste is significant [62,92].…”

Section: Rheological Behavior Of Food Wastementioning

confidence: 99%

A Review on the Rheological Behavior of Organic Waste for CFD Modeling of Flows in Anaerobic Reactors

Caillet¹,

Adelard²

2022

Waste Biomass Valor

View full text Add to dashboard Cite

Anaerobic digestion is a widely used process for organic waste treatment and renewable energy production. This is a complex natural biodegradation of organic matter involving four main biochemical reactions through the action of four microbial groups. The performances of anaerobic digestion (biodegradation and biogas production) depend on the contact between the biodegradable materials and the micro-organisms. Consequently, hydrodynamics phenomena have a significant impact on the anaerobic digestion. Computational Fluid Dynamics (CFD) simulations allow to simulate the flow field within anaerobic digesters. In these models, the waste are characterized by their physical properties, specifically their rheological properties. Rheology consists in the study of the flow of liquids or viscous materials. In this respect, it involves the properties related to the flow behavior of liquids and the temporary and/or permanent deformation of materials. The knowledge on the rheological properties of the biowaste is crucial in order to describe the flows using CFD models. The aim of this review is to present the physical properties of different type of waste, as well as the rheological models. In conclusion, the rheological behaviors of wastewater, manure, and sludge are described in literature. However the rheological behaviors of a mix of biowaste and solid food waste are poorly known. Research should focus on the experimental measurements of these biowaste. These data are necessary for CFD modeling of flows in anaerobic reactors treating this type of waste.

show abstract

Section: Rheological Behavior Of Food Wastementioning

confidence: 99%

A Review on the Rheological Behavior of Organic Waste for CFD Modeling of Flows in Anaerobic Reactors

Caillet¹,

Adelard²

2022

Waste Biomass Valor

View full text Add to dashboard Cite

show abstract

“…Kamarád et al (2013), Dapelo and Bridgeman (2018) and Mao et al (2019) investigated the minimum retention time of the fed substrate with different mixing systems for real large-scale anaerobic digesters. Patrícia et al (2020) and El Ibrahimi et al (2021) studied and analysed the influence of heating and liquid recirculation on digesters with submerged wastes under mesophilic conditions on the thermodynamic performance of the digester. Acetogenesis and methanogenesis reactions were studied by Azargoshasb et al (2015) using 3D CFD and population balance equations.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis for Anaerobic Digestion Inside a Batch Digester Augmented With Extended Surfaces

Soheel¹,

Faraj²,

Hussien³

2023

Front. Heat Mass Transf.

View full text Add to dashboard Cite

The household batch reactor using cow manure as the substrate generates methane gas used as fuel. This paper presents two-dimensional (3D) axisymmetric using commercial COMSOL 5.5 Multiphysics software. This is a computational fluid dynamics (CFD) model based on conservation equations with the chemical reaction model of anaerobic digestion (AD) processes to investigate the influence of different horizontal circular extended surfaces augmented to the inside digesters on the performance of the anaerobic digestion. Using four batch digesters, D1 with no extended surfaces and D2, D3, and D4 have augmented with four horizontal circular extended surfaces of width 2,4 and 6 cm, respectively. The numerical results showed that the cow manure's velocity distribution depends on the chemical reaction's heat, which produces natural convection currents. Furthermore, the temperature and species profiles of the anaerobic digestion process depended on the extended surface area. The D4 has a maximum methane molar concentration, augmented with a higher extended surface area than other digesters. Simulation results agreed with the experimental literature results of various anaerobic digestion processes: for all cases, the mean absolute present error (MAPE) was less than 10%, which is acceptable.

show abstract

“…Wang et al [27] studied the effect of co-digestion and digestate recirculation on bio-hydrogen and bio-methane production and found that digestate recirculation could promote the hydrogen production rate (HPR) and methane production rate (MPR). Ibrahimi et al investigated the effects of the flow rate of liquid recirculation in a mesophilic digester and found that gentle mixing (11 L/min) achieved a higher specific methane yield and less heat loss compared with intense mixing (24 L/min) [28]. Pezzolla et al [29] reported that frequent percolate recirculation in DAD decreased the inhibition and increased the methane yield.…”

Section: Introductionmentioning

confidence: 99%

Impact of Mechanical Stirring and Percolate Recirculation on the Performances of Dry Anaerobic Digestion

Zhang,

Chang,

Zhao

et al. 2023

Fermentation

View full text Add to dashboard Cite

Dry anaerobic digestion (DAD) is an attractive method for simultaneous organic waste disposal and bioenergy recovery. DAD has the problems of low methane yields, low reaction rates, and easy inhibition due to its limited mass transfer and heat transfer. In this work, two methods of mechanical stirring and percolate recirculation were compared regarding their capacities of improving the mass transfer and enhancing the performances of DAD in batch experiments with sorghum stalks as a substrate. The cumulative biogas yield and system stability were investigated when the stirring linear velocity was 0 cm/s, 22 cm/s, 44 cm/s, 66 cm/s, and 88 cm/s. When the stirring linear velocity was 88 cm/s, the cumulative biogas yield and methane content were highest. The computational fluid dynamics (CFD) simulation indicated that the shearing force near the stirring shaft was largest. When the linear velocity of the stirring paddle was 88 cm/s, the shearing force at a radial distance close to center was about −140 N/m2. When the ratio of the material stacking height to the reactor diameter (H/D) was 3:2, the AD showed the best performance. A higher material stacking height promoted the contact between the microorganisms and the substrate and enhanced the biogas production. By combining percolate recirculation and mechanical stirring, the cumulative biogas yield increased by 28% compared with the static DAD process because of the promotion of mass transfer in the DAD.

show abstract

Food waste treatment through anaerobic co-digestion: Effects of mixing intensity on the thermohydraulic performance and methane production of a liquid recirculation digester

Cited by 17 publications

References 57 publications

A Review on the Rheological Behavior of Organic Waste for CFD Modeling of Flows in Anaerobic Reactors

A Review on the Rheological Behavior of Organic Waste for CFD Modeling of Flows in Anaerobic Reactors

CFD Analysis for Anaerobic Digestion Inside a Batch Digester Augmented With Extended Surfaces

Impact of Mechanical Stirring and Percolate Recirculation on the Performances of Dry Anaerobic Digestion

Contact Info

Product

Resources

About