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

作　　者：Zhihua Li Ting Zhang Na Li Xiaochang Wang 

机构地区：[1]Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education of China, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China [2]Shaanxi Bobo Project and Architecture Design Co., Ltd., Xi'an 710061, China

出　　处：《Journal of Environmental Sciences》2010年第1期62-67,共6页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50708089);the Program for Changjiang Scholars and Innovative Research Team in University of MOE of China (PCSIRT) (No.IRT0853);the Natural Science Foundation of Shaanxi Province (No.2009JQ7002);the Research Plant for Key Laboratoryof Universities of Shaanxi Province (No.09JS027)

摘　　要：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.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.

关 键 词：aerobic granule sludge bulking filamentous microorganisms thermogravimetric analysis 

分 类 号：X703.3[环境科学与工程—环境工程] X703