Methanogenic Activity in Biogas Production High-Solids and Liquid Anaerobic Co-Digestion of Municipal Solid Waste and Sewage Sludge

Authors

Department of Biosystems Engineering, University of Mohaghegh Ardabili, Ardabili, Iran

Abstract

Bioenergy recovery and pollution control through anaerobic digestion (AD) of organic wastes is a promising greenhouse gas mitigation option and is considered to be a sustainable waste treatment practice. Since methane-rich biogas is the main end product of AD, methane production must be improved to maximize revenues from energy generation and hence, to make digestion facilities more profitable.
The total solids (TS) content in association with the organic loading rate is also one of the key factors that affect the performance, cost, and stability of AD systems. It has been reported that the TS content affects the following parameters: rheology and viscosity of the digester contents, fluid dynamics, clogging, and solid sedimentation that can directly influence the overall mass transfer rates within the digesters. Since the TS content is an important parameter, two main types of AD processes have been developed: liquid and high-solids AD. Liquid AD (L-AD) systems typically operate with 5-10% TS, while high-solids AD (HS-AD) refers to a process that generally operates at 15-40% TS.
The purpose of this study was to determine the optimal mixing ratio of co-digestion municipal solid waste and sewage sludge. Then, the effect of high-solids and liquid anaerobic digestion on the mixing ratio was investigated using pilot-scale anaerobic non-continuous bioreactors.

Keywords

Main Subjects

References

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Journal of Civil and Environmental Engineering
Volume 51.4, Issue 105 - Serial Number 105
Winter 2022
January 2022
Pages 109-117

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