Properties of phenol-removal aerobic granules during normal operation and shock loading.
The physical structure and activity of aerobic granules, and the succession of bacterial community within aerobic granules under constant operational conditions and shock loading were investigated in one sequencing batch reactor over ten months. While the maturation phase of the granulation process began on day 30, the structure of microbial community changed markedly until after three months of reactor operation under constant conditions with a loading rate of 1.5 g phenol L(-1) day(-1). A shock loading of 6.0 g phenol L(-1) day(-1) from days 182-192 led to divergence of bacterial community, an inhibition of the biomass activity, and a decrease in phenol removal rate in the reactor. However, phenol was still completely removed under this disturbance. After the shock loading, the mean sizes of aerobic granules increased, and the activity of the microbial population within the granules decreased, although there appeared highly resilient for the dominant bacterial community of aerobic granules which mainly included beta-Proteobacteria. Correlation analysis suggested that biomass concentration and biomass loading were significantly related to the community composition of aerobic granules during the whole operational period. The development of a relatively stable bacterial community in aerobic granules implied that those distinct dominant microbes in aerobic granules were favorably selected and proliferated under the operational conditions.
Jiang
He-Long
HL
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Science, 73 East Beijing Road, Nanjing, 210008, People's Republic of China. hljiang@niglas.ac.cn
Maszenan
Abdul Majid
AM
Zhao
Zhi-Wei
ZW
Tay
Joo-Hwa
JH
D000332:Aerobiosis; D020562:Betaproteobacteria / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D044822:Biodiversity; D018533:Biomass; D008969:Molecular Sequence Data; D010636:Phenols / Q000378:metabolism* / Q000633:toxicity; D017422:Sequence Analysis, DNA; D013312:Stress, Physiological; D014874:Water Pollutants, Chemical / Q000378:metabolism* / Q000633:toxicity; D018508:Water Purification
D010636:Phenols; D014874:Water Pollutants, Chemical