title: Foam suppression in overloaded manure-based biogas reactors using antifoaming agents.
abstract: Foam control is an imperative need in biogas plants, as foaming is a major operational problem. In the present study, the effect of oils (rapeseed oil, oleic acid, and octanoic acid) and tributylphosphate on foam reduction and process performance in batch and continuous manure-based biogas reactors was investigated. The compounds were tested in dosages of 0.05%, 0.1% and 0.5% v/vfeed. The results showed that rapeseed oil was most efficient to suppress foam at the dosage of 0.05% and 0.1% v/vfeed, while octanoic acid was most efficient to suppress foam at dosage of 0.5% v/vfeed. Moreover, the addition of rapeseed oil also increased methane yield. In contrast, tributylphosphate, which was very efficient antifoam, was found to be inhibitory to the biogas process.
authors.affiliation: Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
authors.forename: P G
authors.initials: PG
authors.lastname: Kougias
authors.affiliation: Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
authors.forename: K
authors.initials: K
authors.lastname: Boe
authors.affiliation: Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
authors.forename: P
authors.initials: P
authors.lastname: Tsapekos
authors.affiliation: Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark. Electronic address: iria@env.dtu.dk.
authors.forename: I
authors.initials: I
authors.lastname: Angelidaki
mesh_terms: D000818:Animals; D000934:Antifoaming Agents / Q000494:pharmacology*; D061249:Batch Cell Culture Techniques; D056804:Biofuels; D019149:Bioreactors; D002417:Cattle; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D008372:Manure; D008697:Methane / Q000032:analysis
chemical_list: D000934:Antifoaming Agents; D056804:Biofuels; D005232:Fatty Acids, Volatile; D008372:Manure; D008697:Methane
keywords: Anaerobic digestion; Antifoams; Biogas; Foaming; Organic overload