Granulation of biological flocs under elevated pressure: characteristics of granules

doi:10.2166/wst.2013.199

機構典藏 > College of Engineering > Graduate Institute & Department of Water Resources and Environmental Engineering > Journal Article > Item 987654321/90625

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Title:	Granulation of biological flocs under elevated pressure: characteristics of granules
Authors:	Liang, Yang-Min;Chen, Jie-Yuan;Marchesini Gaëtan;Li, Chi-wang;Chen, Shiao-Shing
Contributors:	淡江大學水資源及環境工程學系
Keywords:	aerobic granulation;elevated pressure;organic loading rate
Date:	2013-06
Issue Date:	2013-07-09 10:58:21 (UTC+8)
Publisher:	London: I W A Publishing
Abstract:	Aerobic granules (AG) have good settling ability and are relatively insensitive to the variation of organic loading rate. When sizes of granules become bigger, substrate and oxygen become limited in the granule core, leading to cell lysis and disintegration of granules. The higher the dissolved oxygen, the deeper the oxygen penetration inside AG. AG operated under elevated pressure might be a possible way to maintain long-term stability of granules. In this study, formation and characteristics of AG in the reactor operated under elevated high pressure (HP) and ambient pressure (AP) are investigated. Results show that both systems removed an average 95% of total organic carbon. Sludge volume index at 5 and 30 min settling times under HP are 35% smaller those under AP, indicating that HP granules have a better settling ability and a denser structure than AP granules. The granule size in the HP system is very uniform, while size distribution in the AP system is broader, indicating that the AP system contains flocculent sludge. Extracellular polymeric substances and polysaccharides (PS) are almost the same for HP and AP; however, exopolymeric protein (PN) is very different. PS/PN ratio for HP sludge is four times that of AP. The result is consistent with sludge settleability, which is improved with increasing PS/PN ratio.
Relation:	Water Science and Technology 67(12), pp.2850-2855
DOI:	10.2166/wst.2013.199
Appears in Collections:	[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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