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High solid and wet anaerobic digestion technologies for the treatment of the organic fraction of municipal solid wastes and food wastes: A comparative case study in Brazil

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Authors
Silva-Martinez, Rodolfo D
Sanches Pereira, Alessandro
Ornellas-Ferreira, Bernardo
Breno, Carneiro-Pinheiro
Suani, Teixeira Coelho
Date
2023
Type
Journal Article

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Silva-Martinez, R.D. and Sanches Pereira, A. and Ornellas-Ferreira, B. and Breno, C.-P. and Suani, T.C. 2023. High solid and wet anaerobic digestion technologies for the treatment of the organic fraction of municipal solid wastes and food wastes: A comparative case study in Brazil. Bioresource Technology Reports. 21: 101306.
Source Title
Bioresource Technology Reports
DOI
Faculty
Faculty of Humanities
School
School of Design and the Built Environment
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Abstract

This study evaluates and compares the resource, energy, and GHG emission performance of two biodigestion plants in Brazil, that treat the organic fraction of municipal solid waste (OFMSW); one operating under high solid anaerobic digestion (HSAD) and the other as a wet anaerobic digestion (WAD) system. The results indicate that the HSAD system: (1) Utilizes less water (for WAD 83.5 l/t OFMSW, for HSAD no extra water is added); (2) produces almost 2.5 times more biofertilizer, with roughly 233 kg/t OFMSW compared to 100 kg/t OFMSW of the WAD plant; (3) it has significantly higher energy efficiency with an energy ratio (ER) of 26.4 %, whereas for WAD the ER is 68 %; and, (4) it presents a significant GHG mitigation potential, reaching yearly savings of 3,892,587.56 kg CO2eq. With this, HSAD proves to be a suitable solution for the Brazilian conditions and offers tangible diverse benefits to treat the OFMSW.