title: Psychrophilic one- and two-step systems for pre-treatment of winery waste water.
abstract: The operation performance of a single and two (in series) laboratory UASB reactors (working volume of 2.7 l, recycle ratio varied from 1:1 to 1:18) treating diluted wine vinasse was investigated under psychrophilic conditions (4-10 degrees C). For a single UASB reactor seeded with granular sludge, the average organic loading rates (OLR) applied were 4.7, 3.7 and 1.7 g COD/l/d (hydraulic retention times (HRTs) were around 1 d) at 9-11, 6-7 and 4-5 degrees C, respectively. The average total COD removal for preacidified vinasse wastewater was around 60% for all the temperature regimes tested. For two UASB reactors in series, the average total COD removal for treatment of non-preacidified wastewater exceeded 70% (the average OLRs for a whole system were 2.2, 1.8 and 1.3 g COD/l/d under HRTs of 2 days at 10, 7 and 4 degrees C, respectively). In situ determinations of kinetic sludge characteristics (Vm and Km) revealed the existence of substantial mass-transfer limitations for the soluble substrates inside the reactor sludge bed. Therefore an application of higher recycle rations is essential for enhancement of UASB pre-treatment under psychrophilic conditions. The produced anaerobic effluents were shown to be efficiently post-treated aerobically--final effluent COD concentrations were around 0.1 g/l.
authors.affiliation: Department of Chemical Enzymology, Chemistry Faculty, Moscow State University, 119899 Moscow, Russia. svk@enzyme.chem.msu.ru
authors.forename: S V
authors.initials: SV
authors.lastname: Kalyuzhnyi
authors.forename: M A
authors.initials: MA
authors.lastname: Gladchenko
authors.forename: V I
authors.initials: VI
authors.lastname: Sklyar
authors.forename: Y S
authors.initials: YS
authors.lastname: Kizimenko
authors.forename: S S
authors.initials: SS
authors.lastname: Shcherbakov
mesh_terms: D019149:Bioreactors; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014920:Wine
chemical_list: D007220:Industrial Waste