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Environmental Engineering Research 2022;27(6): 210334 DOI: https://doi.org/10.4491/eer.2021.334
Effects of illumination time on biological community of algal-bacterial granules and lipid content
Limeng Xi1, Wenli Huang2, Binbin Sun2, Fansheng Meng3, and Shiguo Gu4 
1China Water Resources Beifang Investigation, Design and Research Co. Ltd., Tianjin 300222, China
2College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
3School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
4Institute of Environmental Processes and Pollution Control, and School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
Corresponding Author: Shiguo Gu ,Tel: +0510- 85197773, Email: ychgushiguo@163.com
Received: July 15, 2021;  Accepted: November 30, 2021.
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ABSTRACT
Synthetic wastewater was used to culture granular sludge for 21 weeks at three sequencing batch reactor activated sludge process (SBR) under different photoperiods. The growth of algae changed granular oxygen distribution, which affected the composition of microbial communities. Different photoperiods were able to alter the formation of granular sludge and the microbial community granules. In short photoperiod (12 h/d) sludge could generate symbiotic algae-bacteria granules in the SBR. By contrast, the long photoperiod (24 h/d) promotes the growth of algae and Ascomycota early, and then inhibits algae, especially chlorophyta (only 1.18%). In the end, algae-bacteria-fungi granules were formed in long photoperiod (LP). By GC-MS and model calculation, the lipid content of algae-bacteria granules was 33.71% more than that of pure aerobic granular sludge. However, the proportion of unsaturated fatty acids in algae-bacteria granules was as high as 43%, resulting in the quality of biodiesel prepared from algae-bacteria granule being slightly worse than that prepared from pure aerobic granular sludge. But both of them were better than biodiesel prepared from pure algae. The biodiesel content of algae-bacteria granule in short photoperiod (SP) and LP were 68.79 and 70.66 mg/g, respectively, which was better than that of pure aerobic particles (52.30 mg/g). Therefore, the formation of algae-bacteria granules is an effective way to remove nutrients and reduce harvesting costs.
Keywords: Activated sludge process | Algae-bacteria granules | Biological community | Lipid content
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