title: Enhanced methane production in a two-phase anaerobic digestion plant, after CO2 capture and addition to organic wastes.
abstract: 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 CO(2) 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 CO(2) 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 CO(2) exhibits efficient biomass degradation (58% VSS reduction), increased VFA production during the acidogenic phase (leading to VFA concentration of 8.4 g/L) and high biomethane production (0.350 S m(3)/kg(SSV); 0.363 S m(3)/m(3)(react) · d). Moreover, CO(2) 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.
authors.affiliation: Biotec Sys Srl, Via Gaetano Tacconi, 59, 40139 Bologna, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Salomoni
authors.forename: A
authors.initials: A
authors.lastname: Caputo
authors.forename: M
authors.initials: M
authors.lastname: Bonoli
authors.forename: O
authors.initials: O
authors.lastname: Francioso
authors.forename: M T
authors.initials: MT
authors.lastname: Rodriguez-Estrada
authors.forename: D
authors.initials: D
authors.lastname: Palenzona
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology*; D001709:Biotechnology / Q000295:instrumentation* / Q000379:methods*; D002245:Carbon Dioxide / Q000737:chemistry*; D005232:Fatty Acids, Volatile; D017752:Greenhouse Effect; D008697:Methane / Q000096:biosynthesis*; D009930:Organic Chemicals / Q000737:chemistry*; D010865:Pilot Projects; D014865:Waste Disposal, Fluid
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D009930:Organic Chemicals; D002245:Carbon Dioxide; D008697:Methane