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Characteristics of Critical Solid-Liquid Separation and Its Effect on the Performance of an Anaerobic Sequencing Batch Reactor Treating Municipal Sludge
Korean Journal of Chemical Engineering, November 1998, 15(6), 596-602(7), 10.1007/BF02698984
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Abstract
Solid-liquid separation and its type greatly affected the stability and performance of an anaerobic sequencing batch reactor (ASBR) for municipal sludge digestion. Flotation thickening occurred in the mesophilic ASBR, while solid-liquid separation in the thermophilic ASBR followed gravity thickening. Hydraulic retention times (HRT) and cycle period as well as type of thickening were key parameters governing sludge thickenability and critical solids accumulation. Thickened sludge bed volume was a critical operating variable in the ASBR with gravity thickening, which had poor performance because of the loss of thickened solids, and sludge interface disruption or instability of sludge bed due to internal gas evolution. A cyclic mutual effect between thickened volume and gas production was serious in gravity thickening, whereas it was insignificant in flotation thickening.
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References
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Kennedy KJ, Sanchez WA, Hamoda MF, Droste RL, J. water Pollut. Control Fed., 63(1), 75 (1991)
Sung S, Dague RR, "Laboratory Studies and Modeling of the Anaerobic Sequencing Batch Reactor Processes," Proc. 65th Annual Water Environ. Fed. Conf., New Orleans, Lousiana, 1, 171 (1992)
Yim SS, Kwon YD, Korean J. Chem. Eng., 14(5), 354 (1997)
