title: Lab scale experiments using a submerged MBR under thermophilic aerobic conditions for the treatment of paper mill deinking wastewater.
abstract: This paper describes the results of laboratory experiments using a thermophilic aerobic MBR (TMBR) at 50 °C. An innovative use of submerged flat-sheet MBR modules to treat circuit wastewater from the paper industry was studied. Two experiments were conducted with a flux of 8-13 L/m(2)/h without chemical membrane cleaning. COD and BOD(5) elimination rates were 83% and 99%, respectively. Calcium was reduced from 110 to 180 mg/L in the inflow to 35-60 mg/L in the permeate. However, only negligible membrane scaling occurred. The observed sludge yield was very low and amounted to 0.07-0.29 g MLSS/g COD(eliminated). Consequently, the nutrient supply of ammonia and phosphate can be lower compared to a mesophilic process. Molecular-biological FISH analysis revealed a likewise high diversity of microorganisms in the TMBR compared to the mesophilic sludge used for start-up. Furthermore, ammonia-oxidising bacteria were detected at thermophilic operation.
authors.affiliation: PTS, Hess-Str. 134, 80797 Munich, Germany. benjamin.simstich@ptspaper.de
authors.forename: Benjamin
authors.initials: B
authors.lastname: Simstich
authors.forename: Claudia
authors.initials: C
authors.lastname: Beimfohr
authors.forename: Harald
authors.initials: H
authors.lastname: Horn
mesh_terms: D000332:Aerobiosis; D001673:Biodegradation, Environmental; D044822:Biodiversity; D019149:Bioreactors; D002118:Calcium / Q000032:analysis; D017404:In Situ Hybridization, Fluorescence; D007220:Industrial Waste / Q000032:analysis*; D007281:Ink; D008567:Membranes, Artificial; D009584:Nitrogen / Q000032:analysis; D010209:Paper; D010316:Particle Size; D010539:Permeability; D010758:Phosphorus / Q000032:analysis; D011312:Pressure; D012722:Sewage / Q000382:microbiology; D013696:Temperature; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D002118:Calcium; D007220:Industrial Waste; D008567:Membranes, Artificial; D009584:Nitrogen; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater