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Article

Microalgal-Bacterial Granular Sludge Process in Non-Aerated Municipal Wastewater Treatment under Natural Day-Night Conditions: Performance and Microbial Community

by 1, 2, 2,*, 1 and 3,*
1
School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China
2
Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan 430065, China
3
School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Antonio Panico
Water 2021, 13(11), 1479; https://doi.org/10.3390/w13111479
Received: 19 April 2021 / Revised: 20 May 2021 / Accepted: 21 May 2021 / Published: 25 May 2021
(This article belongs to the Special Issue Innovative Technologies for Wastewater and Water Treatment)
The microalgal-bacterial granular sludge (MBGS) process is expected to meet the future requirements of municipal wastewater treatment technology for decontamination, energy consumption, carbon emission and resource recovery. However, little research on the performance of the MBGS process in outdoor treatment was reported. This study investigated the performance of the MBGS system in treating municipal wastewater under natural alternate day and night conditions in late autumn. The results showed that the average removal efficiencies of Chemical oxygen demand (COD), NH4+-N and PO43−-P on daytime before cooling (stage I, day 1−4) could reach 59.9% ± 6.8%, 78.1% ± 7.9% and 61.5% ± 4.5%, respectively, while the corresponding average removal efficiencies at night were 47.6% ± 8.0%, 56.5% ± 17.9% and 74.2% ± 7.6%, respectively. Due to the dramatic changes in environmental temperature and light intensity, the microbial biomass and system stability was affected with fluctuation in COD and PO43−-P removal. In addition, the relative abundance of filamentous microorganisms (i.e., Clostridia and Anaerolineae) decreased, while Chlorella maintained a dominant position in the eukaryotic community (i.e., relative abundance > 99%). This study can provide a theoretical basis and technical support for the further engineering application of the MBGS process. View Full-Text
Keywords: microalgal-bacterial granular sludge; outdoor; wastewater treatment; microbial community succession microalgal-bacterial granular sludge; outdoor; wastewater treatment; microbial community succession
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MDPI and ACS Style

Wang, S.; Zhu, L.; Ji, B.; Hou, H.; Ma, Y. Microalgal-Bacterial Granular Sludge Process in Non-Aerated Municipal Wastewater Treatment under Natural Day-Night Conditions: Performance and Microbial Community. Water 2021, 13, 1479. https://doi.org/10.3390/w13111479

AMA Style

Wang S, Zhu L, Ji B, Hou H, Ma Y. Microalgal-Bacterial Granular Sludge Process in Non-Aerated Municipal Wastewater Treatment under Natural Day-Night Conditions: Performance and Microbial Community. Water. 2021; 13(11):1479. https://doi.org/10.3390/w13111479

Chicago/Turabian Style

Wang, Shulian, Lin Zhu, Bin Ji, Huan Hou, and Yingqun Ma. 2021. "Microalgal-Bacterial Granular Sludge Process in Non-Aerated Municipal Wastewater Treatment under Natural Day-Night Conditions: Performance and Microbial Community" Water 13, no. 11: 1479. https://doi.org/10.3390/w13111479

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