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Lee, Changsoo
Applied Biotechnology Lab for Environment (ABLE)
Research Interests
  • Bioconversion, Bioenergy, Biogas, Biological treatment, Biorefinery, Microbial community

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Effects of Different pH Control Strategies on Microalgae Cultivation and Nutrient Removal from Anaerobic Digestion Effluent

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Title
Effects of Different pH Control Strategies on Microalgae Cultivation and Nutrient Removal from Anaerobic Digestion Effluent
Author
Yu, HyeonjungKim, JaaiRhee, ChaeyoungShin, JuheeShin, Seung GuLee, Changsoo
Issue Date
2022-02
Publisher
MDPI AG
Citation
MICROORGANISMS, v.10, no.2, pp.357
Abstract
This study investigated nutrient removal from anaerobic digestion effluent by cultivating mixed-culture microalgae enriched from anaerobic sludge under different pH conditions: RUC (uncontrolled), R7–8 (maintained at 7–8), and R<8 (maintained below 8). Significant amounts of NH4+-N were lost by volatilization in RUC cultures due to increased pH values (≤8.6) during the early period of cultivation. The pH control strategies significantly affected the biological NH4+-N removal (highest in R7–8), microalgal growth (highest in R7–8), biomass settleability (highest in R<8), and microalgal growth relative to bacteria (highest in R<8) in the cultures. Parachlorella completely dominated the microalgal communities in the inoculum and all of the cultures, and grew well at highly acidic pH (<3) induced by culture acidification with microalgal growth. Microalgae-associated bacterial community structure developed very differently among the cultures. The findings call for more attention to the influence and control of pH changes during cultivation in microalgal treatment of anaerobic digestion effluent.
URI
https://scholarworks.unist.ac.kr/handle/201301/57604
DOI
10.3390/microorganisms10020357
ISSN
2076-2607
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