Enhanced methane production in a two-phase anaerobic digestion plant, after CO2 capture and addition to organic wastes

Cost-effective technologies are needed to reach the international greenhouse gas (GHG) reduction targets in many fields, including waste and biomass treatment. This work reports the effects of CO2 capture from a combustion flue gas and its use in a newly-patented, two-phase anaerobic digestion (TPAD...

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Bibliographic Details
Published in:Bioresource technology 2011-06, Vol.102 (11), p.6443-6448
Main Authors: Salomoni, C., Caputo, A., Bonoli, M., Francioso, O., Rodriguez-Estrada, M.T., Palenzona, D.
Format: Article
Language:English
Subjects:
anaerobic digestion
Anaerobiosis
Applied sciences
Biofuel production
Biofuels
Biogas
Biological and medical sciences
Biological treatment of sewage sludges and wastes
biomass
Biomethanation
Biomethane production
Bioreactors - microbiology
Biotechnology
Biotechnology - instrumentation
Biotechnology - methods
Carbon Dioxide - chemistry
CO2 capture
combustion
emissions
Energy
energy recovery
Environment and pollution
Exact sciences and technology
Fatty Acids, Volatile
Fundamental and applied biological sciences. Psychology
gases
Greenhouse Effect
greenhouse gases
Industrial applications and implications. Economical aspects
Methane - biosynthesis
methane production
Organic Chemicals - chemistry
organic wastes
Pilot Projects
Pollution
sludge
Two-phase anaerobic digestion
Waste Disposal, Fluid
waste treatment
Wastes
wastewater
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Summary:Cost-effective technologies are needed to reach the international greenhouse gas (GHG) reduction targets in many fields, including waste and biomass treatment. This work reports the effects of CO2 capture from a combustion flue gas and its use in a newly-patented, two-phase anaerobic digestion (TPAD) process, to improve energy recovery and to reduce CO2 emissions. A TPAD process, fed with urban wastewater sludge, was successfully established and maintained for several months at pilot scale. The TPAD process with injection of CO2 exhibits efficient biomass degradation (58% VSS reduction), increased VFA production during the acidogenic phase (leading to VFA concentration of 8.4g/L) and high biomethane production (0.350Sm3/kgSSV; 0.363Sm3/m3react·d). Moreover, CO2 intake in the acid phase has a positive impact on the overall GHG balance associated to biomethane production, and suggests an improved solution for both emission reduction and biomass conversion into biomethane.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2011.03.079