Granulation of filamentous microorganisms in a sequencing batch reactor with saline wastewater

作者：Li Zhihua; Zhang Ting; Li Na; Wang Xiaochang

来源：Journal of Environmental Sciences, 2010, 22(1): 62-67.

DOI：10.1016/S1001-0742(09)60075-9

• aerobic granule
• sludge bulking
• filamentous microorganisms
• thermogravimetric analysis

Proliferation of filamentous microorganisms frequently leads to operational failure for activate sludge systems. In this study, it was found that filamentous microorganisms could grow in compact granular structure with 5% sodium chloride in the substrate. In the early period of experiment, coccoid and rode-like bacteria predominated in the yellowish-brown granules, and later the white and the black granules were developed by filamentous microorganisms. The filamentous granules exhibited low porosity and fast settling velocity, and were more compact even than bacteria granules. It was hypothesized that the elevated pH in the later period might be a possible reason for the compact growth of filamentous granules. However, the bacteria granules showed the high bioactivity in terms of specific oxygen utilizing rate, and comprised of a wider diversity of compounds based on the thermogravimetric evaluation. The findings in this study demonstrated that filamentous microbes could form compact granular structure, which may encourage the utilization of filamentous microorganisms rather than the inhibition of their growth, as the latter is frequently used for sludge bulking control.

• 出版日期2010
• 单位西安建筑科技大学