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Article

Description of a Decentralized Small Scale Digester for Treating Organic Wastes

1
Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, 24009 León, Spain
2
School of Industrial Engineering, Computer Science and Aerospace, University of León, Campus Vegazana, 24009 León, Spain
*
Author to whom correspondence should be addressed.
Received: 11 September 2020 / Revised: 25 September 2020 / Accepted: 26 September 2020 / Published: 29 September 2020
(This article belongs to the Special Issue Small-Scale Anaerobic Digestion for Biogas Production)
This manuscript deals with the detailed design of a small digestion prototype intended as a commercial unit fully operational to cover the demand for decentralized treatment of wastes. These plants are highly affected by the complex nature of wastes giving rise to different operating problems that should be considered in detail. This paper describes the design and start-up strategy of a small-scale digestion plant with a volume of 8 m3 designed to operate with a hydrolysis pretreatment unit. The plant was designed to treat fruit and vegetable wastes as substrates derived from a local processing food factory. The performance of the plant during fed-batch operation was reported. The strategy of inoculating the reactor only to a third of its original volume and subsequently increasing the volume of the reactor by using the fed-batch mode was inadequate. The acid pH of the feeding substrate resulted in the application of a low organic loading rate with a volumetric variation of just 19.7 L/d. The performance of the plant was evaluated at non-steady state conditions and resulted in excessive destruction of volatile solids due to the low nitrogen content of the feeding substrate. The prototype reported a specific methane production of 232 L/kg volatile solids despite the low feeding rate supplemented. View Full-Text
Keywords: decentralized digestion; organic waste treatment; small scale systems; biogas production decentralized digestion; organic waste treatment; small scale systems; biogas production
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MDPI and ACS Style

González, R.; Blanco, D.; González-Arias, J.; García-Cascallana, J.; Gómez, X. Description of a Decentralized Small Scale Digester for Treating Organic Wastes. Environments 2020, 7, 78. https://0-doi-org.brum.beds.ac.uk/10.3390/environments7100078

AMA Style

González R, Blanco D, González-Arias J, García-Cascallana J, Gómez X. Description of a Decentralized Small Scale Digester for Treating Organic Wastes. Environments. 2020; 7(10):78. https://0-doi-org.brum.beds.ac.uk/10.3390/environments7100078

Chicago/Turabian Style

González, Rubén, Daniel Blanco, Judith González-Arias, José García-Cascallana, and Xiomar Gómez. 2020. "Description of a Decentralized Small Scale Digester for Treating Organic Wastes" Environments 7, no. 10: 78. https://0-doi-org.brum.beds.ac.uk/10.3390/environments7100078

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