title: Production of polyhydroxyalkanoates by activated sludge treating a paper mill wastewater.
abstract: Production of polyhydroxyalkanoates (PHAs) in activated sludge treating wastewater represents an economical and environmental promising alternative to pure culture fermentations. A process for production of PHA from a paper mill wastewater was examined at laboratory scale. The three stage process examined consisted of acidogenic fermentation to convert wastewater organic matter to volatile fatty acids (VFAs), an activated sludge system operating under feast/famine conditions to enrich for PHA producing organisms and accumulation of PHA in batch experiments. After fermentation of the wastewater, 74% of the soluble COD was present as VFA (acetate, propionate, butyrate and valerate) and the resulting PHA after batch accumulation consisted of 31-47 mol% hydroxybutyrate and 53-69 mol% hydroxyvalerate. The maximum PHA content achieved was 48% of the sludge dry weight and the three stage process exhibited a potential to produce 0.11 kg of PHA per kg of influent COD treated.
authors.affiliation: AnoxKaldnes AB, Klosterängsvägen 11A, SE-226 47 Lund, Sweden. simon.bengtsson@anoxkaldnes.com
authors.forename: Simon
authors.initials: S
authors.lastname: Bengtsson
authors.forename: Alan
authors.initials: A
authors.lastname: Werker
authors.forename: Magnus
authors.initials: M
authors.lastname: Christensson
authors.forename: Thomas
authors.initials: T
authors.lastname: Welander
mesh_terms: D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D018533:Biomass; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis; D005285:Fermentation; D005502:Food; D007220:Industrial Waste; D007700:Kinetics; D008858:Microscopy, Phase-Contrast; D010209:Paper; D054813:Polyhydroxyalkanoates / Q000096:biosynthesis*; D012722:Sewage; D018508:Water Purification / Q000379:methods*
chemical_list: D005232:Fatty Acids, Volatile; D007220:Industrial Waste; D054813:Polyhydroxyalkanoates; D012722:Sewage