Performance Analysis at the Dynamic State of Solid-liquid Separation in the Sequencing Batch Anaerobic Reactor Treating Municipal Sludge

Joon Moo Hur; Duk Chang

Journal of Industrial and Engineering Chemistry, Vol.9, No.4, 391-397, October, 2003

Joon Moo Hur^†, and Duk Chang¹

Green Engineerin and Construction Co., Ltd, 14th floor, West Building, IT Venture Tower, Seoul 138-711, Korea
¹Department of Environmental Engineering, College of Engineering, Konkuk University, Seoul 143-701, Korea

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Performances of the anaerobic sequencing batch reactor (ASBR) for municipal sludge digestion clearly demonstrated that the stability of the ASBR process to treat high-solids-content waste could be greatly affected by critical factors for solid-liquid separation. Flotation thickening occurred in mesophilic ASBR, while solid-liquid separation in thermophilic ASBR followed a gravity thickening. The hydraulic retention time (HRT) and cycle period as well as the type of thickening were key parameters to govern sludge thickenability(thickening ability) and critical solids accumulation. Thickened sludge bed volume was a critical operating variable in the ASBR with the gravity thickening, which had a 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 significant in the gravity thickening, whereas it was insignificant in the flotation thickening.

Keywords:Anaerobic sequencing batch reactor;solid-liquid separation;sludge thickenability

[References]

Earley JP, Ketchum LH, Anaerobic Treatment of Industrial Wastewaters, M.F. Torpy, Ed., p. 90, Noyes Data Corp., New Jersey (1988)
Dague RR, Pidaparti SR, Proc. 46th Ind. Waste Conf. Purdue University, pp. 751-760, West Lafayette, Indiana (1992)
Chang D, Chung TH, Development of a Novel High-Rate Anaerobic Process using Sequencing Batch Reactors, Report to the Korea Research Foundation, pp. 278-312, Konkuk University, Seoul (1995)
Kennedy KJ, Sanchez WA, Hamoda MF, Droste RL, J. Water Pollut. Control Fed., 63(1), 75 (1991)
Sung S, Dague RR, Proc. 65th Annual Water Environ. Fed. Conf., 1, pp. 171-182, New Orleans, Lousiana (1992)
Han JW, Chang D, Kim SS, J. Korean Soc. Water Waste, 8, 1 (1994)
Chung TH, Chang D, Proc. 3rd WPCF/JSWA Joint Tech. Semi., pp. 345-370, Tokyo, Japan (1988)
American Public Health Association, American Water Works Association, Water Environment Federation, Standard Methods for the Examination of Water and Wastewater. A.E. Greenberg, L.S. Clesceri, A.D. and Eaton, Ed. 18th Edn., pp. 1-1-10-142, Washington, D.C. (1992)
Oh KK, Kim YS, Yoon HH, Tae BS, J. Ind. Eng. Chem., 8(1), 64 (2002)

[Referenced By]

[1] Earley JP, Ketchum LH, Anaerobic Treatment of Industrial Wastewaters, M.F. Torpy, Ed., p. 90, Noyes Data Corp., New Jersey (1988)

[2] Dague RR, Pidaparti SR, Proc. 46th Ind. Waste Conf. Purdue University, pp. 751-760, West Lafayette, Indiana (1992)

[3] Chang D, Chung TH, Development of a Novel High-Rate Anaerobic Process using Sequencing Batch Reactors, Report to the Korea Research Foundation, pp. 278-312, Konkuk University, Seoul (1995)

[4] Kennedy KJ, Sanchez WA, Hamoda MF, Droste RL, J. Water Pollut. Control Fed., 63(1), 75 (1991)

[5] Sung S, Dague RR, Proc. 65th Annual Water Environ. Fed. Conf., 1, pp. 171-182, New Orleans, Lousiana (1992)

[6] Han JW, Chang D, Kim SS, J. Korean Soc. Water Waste, 8, 1 (1994)

[7] Chung TH, Chang D, Proc. 3rd WPCF/JSWA Joint Tech. Semi., pp. 345-370, Tokyo, Japan (1988)

[8] American Public Health Association, American Water Works Association, Water Environment Federation, Standard Methods for the Examination of Water and Wastewater. A.E. Greenberg, L.S. Clesceri, A.D. and Eaton, Ed. 18th Edn., pp. 1-1-10-142, Washington, D.C. (1992)

[9] Oh KK, Kim YS, Yoon HH, Tae BS, J. Ind. Eng. Chem., 8(1), 64 (2002)