title: Storage-based denitrification with municipal wastewater: influence of the denitrification stage duration.
abstract: Microbial polyhydroxyalkenoates (PHAs) degradation is the rate limiting step for denitrification which is based on microbial carbon storage. The influence ofdenitrification stage duration (3, 2 and 1.5 h) on PHA degradation kinetics and denitrification efficiency during PHA-based denitrification ofmunicipal wastewater and acetate-based synthetic wastewater was investigated. PHA degradation kinetics showed a good fit to first-order reaction, with higher rates at higher PHA concentrations. Decreasing the denitrification stage duration from 3 to 2 h resulted in an increase in biomass PHA content with the corresponding higher specific denitrification rate. Moreover, the daily denitrification rates increased by about 30% in both the acetate fed reactor and the wastewater fed reactor. Further decreasing the denitrification stage duration to 1.5 h resulted in a decrease in sludge PHA content in both reactors. The amount of filtered chemical oxygen demand removed by storage and PHA stored, remained similar regardless of the denitrification stage duration.
authors.forename: Eli
authors.initials: E
authors.lastname: Krasnits
authors.forename: Michael
authors.initials: M
authors.lastname: Beliavski
authors.forename: Sheldon
authors.initials: S
authors.lastname: Tarre
authors.forename: Michal
authors.initials: M
authors.lastname: Green
mesh_terms: D000693:Anaerobiosis; D018441:Biofilms; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D058440:Denitrification; D007700:Kinetics; D054813:Polyhydroxyalkanoates / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D054813:Polyhydroxyalkanoates; D012722:Sewage; D062065:Wastewater