Effects of Different pH Control Strategies on Microalgae Cultivation and Nutrient Removal from Anaerobic Digestion Effluentopen access
- Yu, Hyeonjung; Kim, Jaai; Rhee, Chaeyoung; Shin, Juhee; Shin, Seung Gu; Lee, Changsoo
- Issue Date
- anaerobic digestion effluent; ammonia loss; mixed-culture microalgae cultivation; Parachlorella; pH control
- MICROORGANISMS, v.10, no.2
- Journal Title
- This study investigated nutrient removal from anaerobic digestion effluent by cultivating mixed-culture microalgae enriched from anaerobic sludge under different pH conditions: R-UC (uncontrolled), R-7(-8) (maintained at 7-8), and R-<8 (maintained below 8). Significant amounts of NH4+-N were lost by volatilization in R-UC 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 R-7(-8)), microalgal growth (highest in R-7(-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.
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- 융합기술공과대학 > Department of Energy Engineering > Journal Articles
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