Continuous-flow aerobic granulation in plug-flow bioreactors fed with real domestic wastewater.

摘要: Abstract This pilot study was designed to explore the feasibility of achieving successful aerobic granulation in continuous flow infrastructure like that existing modern wastewater treatment plants (WWTPs). Results demonstrated activated sludge can be achieved plug-flow reactors (PFRs) fed with primary effluent from a domestic WWTP seasonal temperature variation between 10 and 22.5 °C. It took about 90 days during reactor startup reach state sustained granulation. The characteristics granules formed were comparable those measured sequential batch (SBRs). feast-to-famine concentration profiles found line present full-scale trains, lending support converting systems. A selection pressure based on settling velocity (V s ) applied V selector retain bioparticles greater than ~9–9.75 m h −1 . theorized an external would necessary but not sole condition sufficient drive alternating internal provided by PFRs is also believed required transform biomass flocs toward dense compact granules. While pilot-scale Plug-flow Aerobic Granulation (PAG) similar COD NH 3 removal efficiencies as train, its contained average 138 mg L total suspended solids (TSS) result ‘wash-out” pressure. Pilot results suggest second clarifier for polishing, addition selector, may needed application technique unless other downstream processes (flocculation, sedimentation, filtration) are final water quality goals.