Sandnes JM, Ringstad T, Wenner D, Heyerdahl PH, Källqvist T, Gislerød HR. Real-time monitoring and automatic density control of large-scale microalgal cultures using near infrared (NIR) optical density sensors.
J Biotechnol 2006;
122:209-15. [PMID:
16253371 DOI:
10.1016/j.jbiotec.2005.08.034]
[Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2005] [Revised: 06/20/2005] [Accepted: 08/31/2005] [Indexed: 11/17/2022]
Abstract
Signals from near infrared (NIR) light transmittance sensors were used for both real-time monitoring of algal biomass density in growing mass cultures (200l tubular biofences), and also as feedback in a system that controlled the density of the culture by automatic injection of fresh growth medium. When operated in a semi-continuous production mode between predefined density values, diurnal growth patterns were recorded on-line that provided information on the dynamics of the microalgal cultures with respect to environmental conditions. The bioreactor system was also programmed to operate in constant biomass density mode, thereby maintaining the culture at the optimal population density (OPD), and sustaining high biomass production levels. The system has potential for operating a dynamic density set point for microalgal cultures where the optimal population density varies as a function of ambient growing conditions.
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