期刊
WATER ENVIRONMENT RESEARCH
卷 90, 期 7, 页码 650-658出版社
WILEY
DOI: 10.2175/106143017X15131012153121
关键词
algal membrane bioreactor; carbon dioxide; dissolved inorganic carbon; nutrient removal; lipids; membrane fouling
资金
- NSF [1544794]
- Division Of Computer and Network Systems
- Direct For Computer & Info Scie & Enginr [1544794] Funding Source: National Science Foundation
Algae generally prefer CO2 through passive gas diffusion to HCO3- or CO32-, as uptake of carbonate species relies on active transport. In this study, the effects of CO(2 )bubbling on algal growth, nutrient uptake, lipid accumulation, and membrane fouling control were investigated in an algal membrane bioreactor (A-MBR). Bubbling with 10% CO2 in the A-MBR system increased algal specific oxygen production rate by 43 +/- 5% and algal productivity by 39 +/- 1%, even though there was abundant dissolved inorganic carbon available in the secondary wastewater effluent (about 3.6 mM). Meanwhile, nitrogen removal capacity increased from originally 2.6 +/- 0.4 g/ m(3).d to 3.6 +/- 0.4 g/m(3).d through continuous CO2 bubbling. Furthermore, membrane fouling was significantly reduced in the A-MBR system with CO2 addition, likely because of reduced mineral precipitation on the membrane at lower pHs.
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