University of Tabriz Journal of Civil and Environmental Engineering 2008-7918 51 105 2022 02 20 Methanogenic Activity in Biogas Production High-Solids and Liquid Anaerobic Co-Digestion of Municipal Solid Waste and Sewage Sludge Methanogenic Activity in Biogas Production High-Solids and Liquid Anaerobic Co-Digestion of Municipal Solid Waste and Sewage Sludge 109 117 11424 10.22034/jcee.2020.37374.1887 FA Mansour Ahmadi Pirlou Department of Biosystems Engineering, University of Mohaghegh Ardabili, Ardabili, Iran Tarahhom Mesri Gundoshmian Department of Biosystems Engineering, University of Mohaghegh Ardabili, Ardabili, Iran Journal Article 2019 12 21 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.<br />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.<br />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. 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.<br />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.<br />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. https://ceej.tabrizu.ac.ir/article_11424_863c7b7f296eac1411d30509d192bfa5.pdf