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Article

Reactivation of Frozen Stored Microalgal-Bacterial Granular Sludge under Aeration and Non-Aeration Conditions

by 1, 1, 1,*, 1, 1 and 2,*
1
Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan 430065, China
2
School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Laura Bulgariu and Antonio Zuorro
Water 2021, 13(14), 1974; https://doi.org/10.3390/w13141974
Received: 30 May 2021 / Revised: 14 July 2021 / Accepted: 16 July 2021 / Published: 19 July 2021
(This article belongs to the Special Issue Innovative Technologies for Wastewater and Water Treatment)
In this paper, reactivation of microalgal-bacterial granular sludge (MBGS) stored at −20 °C for 6 months was investigated under respective aeration (R1) and non-aeration (R2) conditions. Results showed that the granular activity could be fully recovered within 21 days. The average removal efficiency of ammonia was higher in R1 (92.78%), while R2 showed higher average removal efficiencies of organics (84.97%) and phosphorus (85.28%). It was also found that eukaryotic microalgae growth was stimulated under aeration conditions, whereas prokaryotic microalgae growth and extracellular protein secretion were favored under non-aeration conditions. Sequencing results showed that the microbial community underwent subversive evolution, with Chlorophyta and Proteobacteria being dominant species under both conditions. Consequently, it was reasonable to conclude that the activity and structure of frozen stored MBGS could be recovered under both aeration and non-aeration conditions, of which aeration-free activation was more feasible on account of its energy-saving property. This study provides important information for the storage and transportation of MBGS in wastewater treatment. View Full-Text
Keywords: microalgal-bacterial granular sludge; frozen storage; reactivation; wastewater treatment; microbial community microalgal-bacterial granular sludge; frozen storage; reactivation; wastewater treatment; microbial community
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MDPI and ACS Style

Shen, Y.; Zhu, L.; Ji, B.; Fan, S.; Xiao, Y.; Ma, Y. Reactivation of Frozen Stored Microalgal-Bacterial Granular Sludge under Aeration and Non-Aeration Conditions. Water 2021, 13, 1974. https://doi.org/10.3390/w13141974

AMA Style

Shen Y, Zhu L, Ji B, Fan S, Xiao Y, Ma Y. Reactivation of Frozen Stored Microalgal-Bacterial Granular Sludge under Aeration and Non-Aeration Conditions. Water. 2021; 13(14):1974. https://doi.org/10.3390/w13141974

Chicago/Turabian Style

Shen, Yao, Lin Zhu, Bin Ji, Siqi Fan, Yabin Xiao, and Yingqun Ma. 2021. "Reactivation of Frozen Stored Microalgal-Bacterial Granular Sludge under Aeration and Non-Aeration Conditions" Water 13, no. 14: 1974. https://doi.org/10.3390/w13141974

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