title: Anaerobic rotating disc batch reactor nutrient removal process enhanced by volatile fatty acid addition.
abstract: RBC effluent needs further treatment because of water-quality standards requiring low nitrogen and phosphorus concentrations. It may be achieved by using reactors with biomass immobilized on the filling's surface as post-denitrification biofilm reactors. Due to the lack of organic matter in treated wastewater, the introduction of external carbon sources becomes necessary. The new attached growth bioreactor--anaerobic rotating disc batch reactor (ARDBR)--was examined as a post-denitrification reactor. The impact of selected volatile fatty acids on nutrient removal efficiency in an ARDBR was studied. The biofilm was developing on totally submerged discs mounted coaxially on a vertical shaft. Acetic, propionic, butyric and caproic acids were applied. Wastewaters were removed from the reactors after 24-h treatment, together with the excess solids. In the ARDBR tank, there was no biomass in the suspended form at the beginning of the treatment process. Acids with a higher number of carbon atoms (butyric and caproic) were the most efficient in denitrification process. The highest phosphorus removal efficiency was noted in the ARDBR with butyric and propionic acids. The lowest unitary consumption of the external source of carbon in denitrification was recorded for acetic acid, whereas the highest one for caproic acid.
authors.affiliation: a Department of Environment Engineering , University of Warmia and Mazury in Olsztyn , Warszawska Str. 117a, Olsztyn 10-719 , Poland.
authors.forename: Joanna
authors.initials: J
authors.lastname: Rodziewicz
authors.forename: Wojciech
authors.initials: W
authors.lastname: Janczukowicz
authors.forename: Artur
authors.initials: A
authors.lastname: Mielcarek
authors.forename: Urszula
authors.initials: U
authors.lastname: Filipkowska
authors.forename: Izabella
authors.initials: I
authors.lastname: Kłodowska
authors.forename: Kamila
authors.initials: K
authors.lastname: Ostrowska
authors.forename: Sylwia
authors.initials: S
authors.lastname: Duchniewicz
mesh_terms: D019149:Bioreactors; D005232:Fatty Acids, Volatile; D017672:Nitrogen Compounds / Q000302:isolation & purification*; D017553:Phosphorus Compounds / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D005232:Fatty Acids, Volatile; D017672:Nitrogen Compounds; D017553:Phosphorus Compounds
keywords: anaerobic rotating disc batch reactor; biofilm reactor; denitrification; phosphorus removal; volatile fatty acids