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High biomass yields of Chlorella protinosa with efficient nitrogen removal from secondary effluent in a membrane photobioreactor.

Authors :
Yang, Min
Liu, Zhen
Wang, Aijie
Nopens, Ingmar
Hu, Hairong
Chen, Hong
Source :
Journal of Environmental Sciences (Elsevier). Dec2024, Vol. 146, p272-282. 11p.
Publication Year :
2024

Abstract

• Chlorella proteinosa was cultivated in an MPBR for secondary effluents treatment. • Highest TN removal rate of 23.8 mg/L/day was achieved at a lowest HRT of 8 hr. • Highest microalgae biomass productivity reached 20.2 mg/L/day at the HRT of 8 hr. • Bacterial nitrogen respiration was reduced by 95.5 % from an HRT of 24 hr to 8 hr. Further treatment of secondary effluents before their discharge into the receiving water bodies could alleviate water eutrophication. In this study, the Chlorella proteinosa was cultured in a membrane photobioreactor to further remove nitrogen from the secondary effluents. The effect of hydraulic retention time (HRT) on microalgae biomass yields and nutrient removal was studied. The results showed that soluble algal products concentration reduced in the suspension at low HRT, thereby alleviating microalgal growth inhibition. In addition, the lower HRT reduced the nitrogen limitation for Chlorella proteinosa 's growth through the phase-out of nitrogen-related functional bacteria. As a result, the productivity for Chlorella proteinosa increased from 6.12 mg/L/day at an HRT of 24 hr to 20.18 mg/L/day at an HRT of 8 hr. The highest removal rates of 19.7 mg/L/day, 23.8 mg/L/day, and 105.4 mg/L/day were achieved at an HRT of 8 hr for total nitrogen (TN), ammonia, and chemical oxygen demand (COD), respectively. However, in terms of removal rate, TN and COD were the largest when HRT is 24 hr, which were 74.5% and 82.6% respectively. The maximum removal rate of ammonia nitrogen was 99.2% when HRT was 8 hr. [Display omitted] [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10010742
Volume :
146
Database :
Academic Search Index
Journal :
Journal of Environmental Sciences (Elsevier)
Publication Type :
Academic Journal
Accession number :
178233577
Full Text :
https://doi.org/10.1016/j.jes.2023.10.036