Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/159883
Title: Microalgal-bacterial granular sludge for municipal wastewater treatment under simulated natural diel cycles: performances-metabolic pathways-microbial community nexus
Authors: Ji, Bin
Wang, Shulian
Silva, Mahamalage Rochelle Udani
Zhang, Meng
Liu, Yu
Keywords: Engineering::Environmental engineering
Issue Date: 2021
Source: Ji, B., Wang, S., Silva, M. R. U., Zhang, M. & Liu, Y. (2021). Microalgal-bacterial granular sludge for municipal wastewater treatment under simulated natural diel cycles: performances-metabolic pathways-microbial community nexus. Algal Research, 54, 102198-. https://dx.doi.org/10.1016/j.algal.2021.102198
Journal: Algal Research
Abstract: In this study, a eukaryotic microalgae dominated microalgal-bacterial granular sludge process was explored for municipal wastewater treatment under simulated natural diel cycles. Different from previous studies with constant illumination, the excellent performances were obtained in terms of organics, ammonia-N and phosphate-P removal under simulated natural day-night conditions. It was found that about 94.9% of organics, 69.5% of ammonia-N and 90.6% of phosphate-P could be removed on average over a day-night cycle at a shorter hydraulic retention time of 2 h in the daytime, while 93.1% of organics, 62.5% of ammonia-N and 80.8% of phosphate-P removed at a hydraulic retention time of 4 h during the nighttime. Chlorophyceae were identified as the dominant microalgae, with Alphaproteobacteria and Sphingobacteriia being the major bacteria in MBGS. It was further revealed that microbial assimilation by microalgae and bacteria could serve as the main mechanism for the observed removal of organics, ammonia and phosphate, while the corresponding key metabolic pathways were also elucidated. Chlorophyceae were found to be the main player for the phosphorus removal via H+-exporting ATPase and H+-transporting two-sector ATPase, while Alphaproteobacteria were potentially responsible for the observed ammonia removal mediated by glutamine synthetase and glutamate dehydrogenase. It is expected that this study can offer an environmentally sustainable option for municipal wastewater treatment.
URI: https://hdl.handle.net/10356/159883
ISSN: 2211-9264
DOI: 10.1016/j.algal.2021.102198
Schools: Interdisciplinary Graduate School (IGS) 
School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Advanced Environmental Biotechnology Centre (AEBC) 
Rights: © 2021 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles
IGS Journal Articles
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