title: Inhibition of volatile fatty acid production in granular sludge from a UASB reactor.
abstract: Inhibition of volatile fatty acids (VFA), namely acetate, butyrate, and propionate, on the activity of acetoclastic methanogens within a full-scale upflow anaerobic sludge blanket (UASB) reactor was investigated using specific methanogenic activity (SMA) test. SMA tests were carried out at acetate concentrations in a range of 1000-25,000 mg l(-1), butyrate concentrations in a range of 3000-25,000 mg l(-1) and propionate concentrations between 500-10,000 mg l(-1). Maximum potential methane production (PMP) rates were obtained as 389 ml CH4 gTVS(-1) x d(-1) at 3000 mg l(-1) acetate concentration, 432 ml CH4 gTVS(-1) x d(-1) at butyrate concentration of 5000 mg l(-1), and 162 mlCH4 gTVS(1) x d(-1) at 1000 mg l(-1) propionate concentration. App. 50% and 100% inhibition occurred at acetate concentrations of 13,000 mg l(-1) and 25,000 mg l(-1), butyrate concentrations of 15,000 mg l(-1) and 25,000 mg l(-1), and propionate concentrations of 3500 mg l-1) and 5000 mg l(-1), respectively.
authors.affiliation: Bogazici University, Institute of Environmental Sciences, Istanbul, Turkey.
authors.forename: Turhan
authors.initials: T
authors.lastname: Dogan
authors.forename: Orhan
authors.initials: O
authors.lastname: Ince
authors.forename: Nilgun Ayman
authors.initials: NA
authors.lastname: Oz
authors.forename: Bahar Kasapgil
authors.initials: BK
authors.lastname: Ince
mesh_terms: D000085:Acetates / Q000378:metabolism / Q000494:pharmacology*; D000693:Anaerobiosis; D001421:Bacteria, Anaerobic / Q000187:drug effects / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002087:Butyrates / Q000378:metabolism / Q000494:pharmacology*; D008697:Methane / Q000378:metabolism*; D011422:Propionates / Q000378:metabolism / Q000494:pharmacology*; D012722:Sewage / Q000382:microbiology
chemical_list: D000085:Acetates; D002087:Butyrates; D011422:Propionates; D012722:Sewage; D008697:Methane