title: Polyhydroxyalkanoate biosynthesis from paper mill wastewater treated by a moving bed biofilm reactor.
abstract: Polyhydroxyalkanoate (PHA) biosynthesis in paper mill wastewater treated by a Moving Bed Biofilm Reactor (MBBR) was evaluated. A MBBR was operated during 300 d. The increasing effect of the Organic Load Rate (OLR) from 0.13 kg BOD(5)/m(3)·d to 2.99 kg BOD(5)/m(3)·d and the influence of two relationship of BOD(5:) N: P (100: 5: 1 and 100: 1: 0.3) on the PHA biosynthesis were evaluated. With an OLR of 0.13 kg BOD(5)/m(3)·d, the maximum organic matter removal measure as Biochemical Oxygen Demand (BOD(5)) was 98.7% for a BOD(5:) N: P relationship of 100: 5: 1. Meanwhile for BOD(5): N: P relationship of 100: 1: 0.3, the maximum efficiency was 87.2% (OLR: 2.99 kg BOD(5)/m(3)·d). The behaviour of the Chemical Oxygen Demand (COD) and total phenolic compound removal efficiencies were below 65.0% and 41.0%, respectively. PHA biosynthesis was measured as a percentage of cells that accumulate PHA, where the maximum percentage was 85.1% and 78.7% when MBBR was operated under a BOD(5): N: P relationship of 100: 5: 1 and 100: 1: 0.3, respectively. Finally, the PHA yields in this study were estimated to range between 0.11 to 0.72 mg PHA/mg VSS and 0.06 to 0.15 mg PHA/mg COD.
authors.affiliation: Environmental Sciences Center EULA-Chile, Universidad de Concepción, Concepción, Chile.
authors.forename: Mayra
authors.initials: M
authors.lastname: Jarpa
authors.forename: Guillermo
authors.initials: G
authors.lastname: Pozo
authors.forename: Rocío
authors.initials: R
authors.lastname: Baeza
authors.forename: Miguel
authors.initials: M
authors.lastname: Martínez
authors.forename: Gladys
authors.initials: G
authors.lastname: Vidal
mesh_terms: D018441:Biofilms; D019149:Bioreactors / Q000382:microbiology*; D007220:Industrial Waste; D010209:Paper; D054813:Polyhydroxyalkanoates / Q000096:biosynthesis*; D014865:Waste Disposal, Fluid
chemical_list: D007220:Industrial Waste; D054813:Polyhydroxyalkanoates