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Causes and control of filamentous growth in aerobic granular sludge sequencing batch reactors

by Qi-Shan Liu Yu Liu *

Abstract

Poor long-term stability of aerobic granules developed in sequencing batch reactors (SBRs) remains a limitation to widespread\r\nuse of aerobic granulation in treating wastewater. Filamentous growth has been commonly reported in aerobic granular sludge\r\nSBR. This review attempts to address the instability problem of aerobic granular sludge SBR from the perspective of filamentous\r\ngrowth in the system. The possible causes of filamentous growth are identified, including long retention times of solids, low\r\nsubstrate concentration in the liquid phase, high substrate gradient within the granule, dissolved oxygen deficiency in the granule,\r\nnutrient deficiency inside granule, temperature shift and flow patterns. Because of cyclic operation of aerobic granular sludge SBR\r\nand peculiarities of aerobic granules, various stresses can be present simultaneously and can result in progressive development of\r\nfilamentous growth in aerobic granular sludge SBR. Overgrowth of filamentous bacteria under stress conditions appears to be a\r\nmajor cause of instability of aerobic granular sludge SBR. S

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