2019 ; Vol.29-4: 633~644
|Author||Xianchao Qin, Chunjie Li, Yueshu Gao, Zhenjia Zhang, Xiaojun Zhang|
|Place of duty||School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.|
|Title||Divergence of Granular Sludges and Microbial Communities in Two Types of Anaerobic Reactors Treating Different Wastewaters|
J. Microbiol. Biotechnol.2019 ;
|Abstract||An advanced anaerobic expanded granular sludge bed (AnaEG) and an internal circulation
(IC) reactor, which were adopted to treat starch processing wastewater (SPW) and ethanol
processing wastewater (EPW), were comprehensively analyzed to determine the key factors
that affected the granules and microbial communities in the bioreactors. The granule size of
900 μm in the AnaEG reactor was smaller than that in the IC reactor, and the internal and
external morphological structures of the granular sludge were also significantly different
between the two types of reactors. The biodiversity, which was higher in the AnaEG reactor,
was mainly affected by reactor type. However, the specific microbial community structure was
determined by the type of wastewater. Furthermore, the dominant methanogens of EPW were
mainly Methanosaeta and Methanobacterium, but only Methanosaeta was a major constituent in
SPW. Compared with the IC reactor, characteristics common to the AnaEG reactor were
smaller granules, higher biodiversity and larger proportion of unknown species. The
comparison of characteristics between these two reactors not only aids in understanding the
novel AnaEG reactor type, but also elucidates the effects of reactor type and wastewater type
on the microbial community and sludge structure. This information would be helpful in the
application of the novel AnaEG reactor.|
|Key_word||Anaerobic bioreactor, microbial community, wastewater, granular sludge|
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