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Open AccessArticle

Development of a Modified Plug-Flow Anaerobic Digester for Biogas Production from Animal Manures

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ProCycla SL, Pont de Vilomara 140, 2-1, 08241 Manresa, Spain
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Departamento de Ingeniería Agraria, Náutica, Civil y Marítima, Universidad de La Laguna, Carretera de Geneto 2, 38071 San Cristóbal de La Laguna, Spain
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IRTA, Torre Marimon, E-08140 Caldes de Montbui, Spain
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Aqualia I + D, Av. Camino de Santiago, 40, Edificio 3, 4ª Planta, E-28050 Madrid, Spain
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Author to whom correspondence should be addressed.
Energies 2019, 12(13), 2628; https://doi.org/10.3390/en12132628
Received: 13 May 2019 / Revised: 26 June 2019 / Accepted: 27 June 2019 / Published: 8 July 2019
(This article belongs to the Special Issue Biogas for Rural Areas )
Traditional plug-flow anaerobic reactors (PFRs) are characterized by lacking a mixing system and operating at high total solid concentrations, which limits their applicability for several kinds of manures. This paper studies the performance of a novel modified PFR for the treatment of pig manure, characterized by having an internal sludge mixing system by biogas recirculation in the range of 0.270–0.336 m3 m−3 h−1. The influence on the methane yield of four operating parameters (recirculation rate, hydraulic retention time, organic loading rate, and total solids) was evaluated by running four modified PFRs at the pilot scale in mesophilic conditions. While the previous biodegradability of organic matter by biochemical methane potential tests were between 31% and 47% with a methane yield between 125 and 184 LCH4 kgVS−1, the PFRs showed a suitable performance with organic matter degradation between 25% and 51% and a methane yield of up to 374 LCH4 kgVS−1. Operational problems such as solid stratification, foaming, or scum generation were avoided. View Full-Text
Keywords: plug-flow reactor; anaerobic digestion; animal manures; biogas; unconfined gas injection mixing; mixing recirculation plug-flow reactor; anaerobic digestion; animal manures; biogas; unconfined gas injection mixing; mixing recirculation
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Gómez, D.; Ramos-Suárez, J.L.; Fernández, B.; Muñoz, E.; Tey, L.; Romero-Güiza, M.; Hansen, F. Development of a Modified Plug-Flow Anaerobic Digester for Biogas Production from Animal Manures. Energies 2019, 12, 2628.

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