title: Anaerobic co-digestion of waste activated sludge and greasy sludge from flotation process: batch versus CSTR experiments to investigate optimal design.
abstract: In this study, the maximum ratio of greasy sludge to incorporate with waste activated sludge was investigated in batch and CSTR experiments. In batch experiments, inhibition occurred with a greasy sludge ratio of more than 20-30% of the feed COD. In CSTR experiments, the optimal greasy sludge ratio was 60% of the feed COD and inhibition occurred above a ratio of 80%. Hence, batch experiments can predict the CSTR yield when the degradation phenomenon are additive but cannot be used to determine the maximum ratio to be used in a CSTR configuration. Additionally, when the ratio of greasy sludge increased from 0% to 60% of the feed COD, CSTR methane production increased by more than 60%. When the greasy sludge ratio increased from 60% to 90% of the feed COD, the reactor yield decreased by 75%.
authors.affiliation: Cemagref, UR GERE, 17 av. de Cucillé, CS 64427, F-35044 Rennes, France. romain.girault@cemagref.fr
authors.forename: R
authors.initials: R
authors.lastname: Girault
authors.forename: G
authors.initials: G
authors.lastname: Bridoux
authors.forename: F
authors.initials: F
authors.lastname: Nauleau
authors.forename: C
authors.initials: C
authors.lastname: Poullain
authors.forename: J
authors.initials: J
authors.lastname: Buffet
authors.forename: P
authors.initials: P
authors.lastname: Peu
authors.forename: A G
authors.initials: AG
authors.lastname: Sadowski
authors.forename: F
authors.initials: F
authors.lastname: Béline
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D018533:Biomass; D001709:Biotechnology / Q000379:methods; D002241:Carbohydrates / Q000032:analysis; D002627:Chemistry, Physical / Q000379:methods; D005740:Gases; D006863:Hydrogen-Ion Concentration; D008055:Lipids / Q000032:analysis; D008697:Methane / Q000737:chemistry; D011506:Proteins / Q000032:analysis; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D002241:Carbohydrates; D005740:Gases; D008055:Lipids; D011506:Proteins; D012722:Sewage; D008697:Methane