title: Oxygen transfer in membrane bioreactors treating synthetic greywater.
abstract: Mass transfer coefficients (k(L)a) were studied in two pilot scale membrane bioreactors (MBR) with different setup configurations treating 200L/h of synthetic greywater with mixed liquor suspended solids' (MLSS) concentrations ranging from 4.7 to 19.5g/L. Besides the MLSS concentration, mixed liquor volatile suspended solids (MLVSS), total solids (TS), volatile solids (VS), chemical oxygen demand (COD) and anionic surfactants of the sludge were measured. Although the pilot plants differed essentially in their configurations and aeration systems, similar alpha-factors at the same MLSS concentration could be determined. A comparison of the results to the published values of other authors showed that not the MLSS concentration but rather the MLVSS concentration seems to be the decisive parameter which influences the oxygen transfer in activated sludge systems operating at a high sludge retention time (SRT).
authors.affiliation: Technische Universität Darmstadt, Institut WAR, Section: Wastewater Technology, Petersenstrasse 13, 64287 Darmstadt, Germany. j.henkel@iwar.tu-darmstadt.de
authors.forename: Jochen
authors.initials: J
authors.lastname: Henkel
authors.forename: Mladen
authors.initials: M
authors.lastname: Lemac
authors.forename: Martin
authors.initials: M
authors.lastname: Wagner
authors.forename: Peter
authors.initials: P
authors.lastname: Cornel
mesh_terms: D019149:Bioreactors; D005858:Germany; D006795:Household Products / Q000032:analysis; D006801:Humans; D007220:Industrial Waste; D008567:Membranes, Artificial; D010100:Oxygen / Q000032:analysis*; D010865:Pilot Projects; D012037:Refuse Disposal / Q000379:methods; D012722:Sewage; D012915:Soaps / Q000032:analysis; D014835:Volatilization; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods; D014872:Water Movements; D018508:Water Purification / Q000295:instrumentation / Q000379:methods; D014881:Water Supply / Q000592:standards*
chemical_list: D007220:Industrial Waste; D008567:Membranes, Artificial; D012722:Sewage; D012915:Soaps; D010100:Oxygen