title: Performance of the biosorptive activated sludge (BAS) as pre-treatment to UF for decentralized wastewater reuse.
abstract: A biosorptive activated sludge (BAS) was operated at lab-scale with diluted and concentrated municipal wastewater to study the efficiency of removal of organics (particulate and soluble COD) and recovery of nutrients (TKN, ammonia, phosphorus). The system performed significantly better with concentrated wastewater, where COD removal efficiency was 80% at organic loading rates between 10 and 20kg m(-3)d(-1). Supplementation of ferrous iron at 20mg L(-1), significantly improved both the removal of particulate, soluble COD and phosphorus. The effluent from the BAS was further treated using an ultrafiltration process with backwashing. The average permeate flux (at constant TMP=0.3bar) increased from 23 to 28 and 34L m(-2)h(-1) when raw sewage, BAS without iron, and iron respectively were tested. The proposed technology is compact, efficient and suitable for decentralized water reuse, while the capital and operational expenses were calculated as 0.64 and 0.43€ m(-3), respectively.
authors: Laboratory for Wastewater Management and Treatment Technologies, Department of Environmental Engineering, Democritus University of Thrace, Xanthi, Greece. Electronic address: bdiamant@env.duth.gr.
authors: V
authors: V
authors: Diamantis
authors: Laboratory for Wastewater Management and Treatment Technologies, Department of Environmental Engineering, Democritus University of Thrace, Xanthi, Greece.
authors: A
authors: A
authors: Eftaxias
authors: Laboratory of Microbial Ecology and Technology, Faculty of Bioscience Engineering, University of Ghent, Belgium.
authors: B
authors: B
authors: Bundervoet
authors: Laboratory of Microbial Ecology and Technology, Faculty of Bioscience Engineering, University of Ghent, Belgium.
authors: W
authors: W
authors: Verstraete
mesh_terms: D000327:Adsorption; D000641:Ammonia / Q000032:analysis; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D003365:Costs and Cost Analysis; D008567:Membranes, Artificial; D010539:Permeability; D010758:Phosphorus / Q000032:analysis; D059027:Recycling; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D014462:Ultrafiltration / Q000191:economics / Q000379:methods*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry* / Q000191:economics
chemical_list: D000641:Ammonia; D008567:Membranes, Artificial; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater
keywords: A-stage bioflocculation; Contact activated sludge; Decentralized water and nutrient reuse; Low sludge age SRT; Municipal wastewater treatment