Aerobic Granular Sludge by Stephan Bathe, Merle De Kreuk

By Stephan Bathe, Merle De Kreuk

Cardio Granular Sludge has lately obtained becoming recognition by way of researchers and know-how builders, world wide. Laboratory reviews and initial box try resulted in the belief that granular activated sludge will be easily demonstrated and profitably utilized in activated sludge crops, supplied "correct" strategy stipulations are selected. yet what makes method stipulations "correct"? And what makes granules diversified from activated sludge flocs? solutions to those questions are provided in cardio Granular Sludge. significant issues lined during this ebook comprise: - purposes and mechanisms of cardio granule formation - constitution of the microbial inhabitants of cardio granules - function, composition and actual houses of EPS - Diffusion problem and microbial task inside granules - Physico-chemical features - Operation and alertness of granule reactors - Scale-up elements of granular sludge reactors, and case reports cardio Granular Sludge offers updated information regarding a speedily rising new know-how of organic remedy.

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Keywords. Aerobic granulation, hydrodynamic shear force, SBBR, start up. Introduction The goals of any biological wastewater treatment are essentially two: high volumetric conversion capacity and low biomass production rates. The conversion capacity is directly proportional to the biomass growth rate via the yield factor (Y), whereas the biomass production is determined by the difference between the actual growth rate (11) and the biomass losses due to endogenous metabolism, death, predation and lysis.

4 Oll o 3 o 2 1 o - - - DO in Rl -0- DO in R2 _ DO in R3 _-.. . ----+--+---+----.. . ----.. . - . - . Ii ,;.. 2 cmls in RI. Therefore, the growth of filamentous organisms was too heavy during the process of sludge granulation for low DO in mix liquor of R 1and finally caused aerobic granules not to form with smooth surface and good settling. 3 cmls in R2, DO in the mixed liquor was high which led to the development of aerobic granules with smooth shape and few filamentous organisms in the reactor.

Under these weak forces, the biofilm grows, increasing its thickness through a porous structure characterized by weak adhesion strengths. The continual increase of biofilm thickness produces a corresponding increase of the shear forces with negative effects on biomass stability that cause the detachment of biofilm particles. In turn, such detachment causes a further sharp increase of the shear forces that promotes the rearrangement of the detached biofilm particles into smooth granules. Keywords.

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