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Improved CO2 utilization efficiency using membrane carbonation in outdoor raceways

Journal Article · · Algal Research
 [1];  [2];  [2];  [2]
  1. Arizona State Univ., Tempe, AZ (United States); Biodesign Swette Center for Environmental Biotechnology at Arizona State University
  2. Arizona State Univ., Tempe, AZ (United States)
Membrane carbonation, the delivery of CO2 by diffusion through non-porous hollow fiber membranes, was successfully integrated into outdoor raceways (5.6 m2, 900 L) and operated continuously for up to 45 days. Biomass productivity associated with membrane carbonation was similar to using traditional sparging, but the average carbon utilization efficiencies for membrane carbonation was 3-fold higher than for sparging when 100% CO2 was delivered to both systems. Here, when the pH setpoint was 8.5, growth on ammonium bicarbonate using membrane carbonation achieved a carbon utilization efficiency of 106 ± 45% due to uptake of some carbon from bicarbonate. Using nitrate as the N source had a 78 ± 55% carbon utilization efficiency, due to dissolved inorganic carbon accumulation as the medium alkalinity increased. Lowering the pH setpoint to 8.0 created a carbon-rich environment that decreased the carbon utilization efficiency to 51 ± 27% due to CO2 off-gassing, but it still was 3-fold higher than with sparging.
Research Organization:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
Grant/Contract Number:
EE0007093; EE0008517
OSTI ID:
1688402
Alternate ID(s):
OSTI ID: 1658995
Journal Information:
Algal Research, Journal Name: Algal Research Vol. 51; ISSN 2211-9264
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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