title: Sulphur fate and anaerobic biodegradation potential during co-digestion of seaweed biomass (Ulva sp.) with pig slurry.
abstract: Seaweed (Ulva sp.) stranded on beaches were utilized as co-substrate for anaerobic digestion of pig slurry in three-month co-digestion tests in pilot scale anaerobic digesters in the laboratory. The methanogenic potential of Ulva sp. was low compared to that of other potential co-substrates available for use by farmers: 148 N m3CH4/t of volatile solids or 19 N m3CH4/t of crude product. When used as a co-substrate with pig manure (48%/52% w/w), Ulva sp. seaweed did not notably disrupt the process of digestion; however, after pilot stabilisation, biogas produced contained 3.5% H2S, making it unsuitable for energy recovery without treatment. Sequentially addition of the sulphate reduction inhibitor, potassium molybdate, to a final concentration of 3mM, temporarily reduced H2S emissions, but was unable to sustain this reduction over the three-month period. According to these pilot tests, the use of seaweed stranded on beaches as co-substrate in farm-based biogas plants shows some limitations.
authors: Cemagref, UR GERE, 17 avenue de Cucillé, CS 64427, F-35044 Rennes, France. pascal.peu@cemagref.fr
authors: P
authors: P
authors: Peu
authors: J-F
authors: JF
authors: Sassi
authors: R
authors: R
authors: Girault
authors: S
authors: S
authors: Picard
authors: Patricia
authors: P
authors: Saint-Cast
authors: F
authors: F
authors: Béline
authors: P
authors: P
authors: Dabert
mesh_terms: D000383:Agriculture / Q000379:methods; D000693:Anaerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D056804:Biofuels; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D005740:Gases; D006862:Hydrogen Sulfide / Q000737:chemistry; D008372:Manure; D008697:Methane / Q000737:chemistry; D008982:Molybdenum / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry; D011188:Potassium / Q000737:chemistry; D012624:Seaweed; D013455:Sulfur / Q000737:chemistry*; D013552:Swine; D044445:Ulva / Q000378:metabolism*
chemical_list: D056804:Biofuels; D005740:Gases; D008372:Manure; D009930:Organic Chemicals; C044659:molybdate; D013455:Sulfur; D008982:Molybdenum; D008697:Methane; D011188:Potassium; D006862:Hydrogen Sulfide