Aerobic Granular Sludge by Stephan Bathe, Merle De Kreuk

By Stephan Bathe, Merle De Kreuk

Cardio Granular Sludge has lately got becoming consciousness through researchers and expertise builders, world wide. Laboratory experiences and initial box attempt resulted in the belief that granular activated sludge might be easily confirmed and profitably utilized in activated sludge crops, supplied "correct" approach stipulations are selected. yet what makes strategy stipulations "correct"? And what makes granules various from activated sludge flocs? solutions to those questions are provided in cardio Granular Sludge. significant subject matters lined during this ebook contain: - purposes and mechanisms of cardio granule formation - constitution of the microbial inhabitants of cardio granules - position, composition and actual homes of EPS - Diffusion difficulty and microbial task inside of granules - Physico-chemical features - Operation and alertness of granule reactors - Scale-up features of granular sludge reactors, and case stories cardio Granular Sludge offers updated information regarding a swiftly rising new expertise of organic remedy.

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Biomass concentration was evaluated in terms of dry weight, as TSS, on a representative bed volume. This measure lumps together granules and biomass attached to the carrier. The hydrodynamic shear forces were calculated by a procedure developed by the authors. lF (1- E) 1,75pF t=----,-+ , Dp SR SR- E- 2 1 , E- ( 1) where: I! , p) known. 75 pFD" (2) Results and discussion During the start-up period (about three months), biomass granulation was obtained according to the following steps. In particular, during the first days of the experimentation it was observed that a thin biofilm completely covered the carrier surface with an average biofilm concentration in the filter bed of about 7 gTSS/L bed and a headloss lower than 10 em.

5 using NaHC0 3 • All reactors were operated in sequencing batch mode at a total cycle duration time of 3 h: 10 min of influent filling, 163 min of aeration, 5 min of settling and 1 min of effluent discharging. Influent and effluent from all reactors were analyzed for CODto1 and the sludge for mixed liquor suspended solids (MLSS), mixed liquor volatile suspended solids (MLVSS) and sludge volume index (SVI) according to standard methods (APHA, 1998). Dissolved oxygen was determined using an oxygen electrode of 55-YSI.

H. -5. -H. -W. Wang, B. A. M. Maszenan 5. -Q. -Q. Llu, 5. -L. sg. sg) Abstract Microbial granules used in aerobic treatment of wastewater have diverse microbial communities, complex spatial structures and coordinated physiological functions. The aim of this study was to investigate how the structures of microbial granules can lead to optimal engineering parameters for wastewater treatment. A variety of radial (perpendicular to the granule surface) aggregates and concentric layers were detected in the granules by confocal laser scanning microscopy (CLSM) using fluorescence in situ hybridization (FISH) with oligonucleotide probes, specific fluorochromes and fluorescent microspheres.

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