title: Biodiesel waste as source of organic carbon for municipal WWTP denitrification.
abstract: This paper presents the results of experiments to test biodiesel waste (glycerine--g-phase) as an organic carbon source for the removal of nitrate in a WWTP denitrification process. Investigation of g-phase was first centered on g-phase utilization as an external source for denitrification under laboratory conditions and consequently, after positive results from the laboratory investigation, g-phase was applied in the denitrification process in the WWTP Vrútky (35,000 PE). This WWTP had insufficient nitrogen removal via denitrification. Denitrification was insufficient due to an influent with a low BOD5/N ratio (1.7:1) entering into the activated sludge tank. Laboratory experiments and calculations showed that, to reach Ntotal concentration under 10 mg l(-1) in effluent, a biodiesel waste dose of 500 kg(COD) d(-1) was necessary. Glycerol phase (g-phase) dosing into the denitrification tank increased denitrification efficiency by 2.0 - 5.0 mg(NO)(3)(-N)l(-1) per 100 l of g-phase dose into the denitrification tank.
authors.affiliation: Institute of Chemical and Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology Bratislava, Radlinského 9, 812 37 Bratislava, Slovak Republic. igor.bodik@stuba.sk
authors.forename: I
authors.initials: I
authors.lastname: Bodík
authors.forename: A
authors.initials: A
authors.lastname: Blstáková
authors.forename: S
authors.initials: S
authors.lastname: Sedlácek
authors.forename: M
authors.initials: M
authors.lastname: Hutnan
mesh_terms: D001674:Bioelectric Energy Sources; D002244:Carbon / Q000737:chemistry*; D002947:Cities; D007753:Laboratories; D009566:Nitrates; D009584:Nitrogen / Q000378:metabolism*; D009930:Organic Chemicals / Q000737:chemistry*; D018154:Slovakia; D013997:Time Factors; D014865:Waste Disposal, Fluid; D014866:Waste Products; D018508:Water Purification
chemical_list: D009566:Nitrates; D009930:Organic Chemicals; D014866:Waste Products; D002244:Carbon; D009584:Nitrogen