Bioenergy recovery from cattle wastewater in an UASB-AF hybrid reactor

New data on biogas production and treatment of cattle wastewater were registered using an upflow anaerobic sludge blanket-anaerobic filter (UASB-AF) hybrid reactor under mesophilic temperature conditions (37 °C). The reactor was operated in semi-continuous mode with hydraulic retention times of 6, 5...

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Bibliographic Details
Published in:Water science and technology 2017-11, Vol.76 (9-10), p.2268-2279
Main Authors: de Mendonça, Henrique Vieira, Ometto, Jean Pierre Henry Balbaud, Otenio, Marcelo Henrique, Dos Reis, Alberto José Delgado, Marques, Isabel Paula Ramos
Format: Article
Language:English
Subjects:
Anaerobic conditions
Animal wastes
Biogas
Bovidae
Cattle
Data recovery
Economic conditions
Economic factors
Energy consumption
Energy recovery
Manures
Methane
Organic loading
Organic matter
Reactors
Refuse as fuel
Removal
Renewable energy
Sludge
Upflow anaerobic sludge blanket reactors
Volatile solids
Wastewater
Wastewater treatment
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Summary:New data on biogas production and treatment of cattle wastewater were registered using an upflow anaerobic sludge blanket-anaerobic filter (UASB-AF) hybrid reactor under mesophilic temperature conditions (37 °C). The reactor was operated in semi-continuous mode with hydraulic retention times of 6, 5, 3 and 2 days and organic loading rates of 3.8, 4.6, 7.0 and 10.8 kg COD m d . Biogas volumes of 0.6-0.8 m m d (3.8-4.6 kg COD m d ) and 1.2-1.4 m m d (7.0-10.8 kg COD m d ), with methane concentrations between 69 and 75%, were attained. The removal of organic matter with values of 60-81% (COD ) and 51-75% (COD ) allowed methane yields of 0.155-0.183 m CH kg COD and 0.401-0.513 m CH kg COD to be obtained. Volatile solids were removed in 34 to 69%, with corresponding methane yields of 0.27 to 0.42 m CH kg VS . The good performance of the novel hybrid reactor was demonstrated by biogas outputs higher than reported previously in the literature, along with the quality of the gas obtained in the various experimental phases. The hybrid reactor investigated in this study presents comparative advantages, particularly in relation to conventional complete mixture units, considering economic factors such as energy consumption, reactor volume and installation area.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2017.325