期刊
BIOTECHNOLOGY AND BIOENGINEERING
卷 109, 期 10, 页码 2567-2574出版社
WILEY
DOI: 10.1002/bit.24525
关键词
microalgae; Chlamydomonas reinhardtii; photosynthetic efficiency; flashing light; photobioreactor; light attenuation
资金
- European Union [FP7-ENERGY-2007-1-RTD, FP7-KBBE-2009-3, 245070]
As a result of mixing and light attenuation, algae in a photobioreactor (PBR) alternate between light and dark zones and, therefore, experience variations in photon flux density (PFD). These variations in PFD are called light/dark (L/D) cycles. The objective of this study was to determine how these L/D cycles affect biomass yield on light energy in microalgae cultivation. For our work, we used controlled, short light path, laboratory, turbidostat-operated PBRs equipped with a LED light source for square-wave L/D cycles with frequencies from 1 to 100?Hz. Biomass density was adjusted that the PFD leaving the PBR was equal to the compensation point of photosynthesis. Algae were acclimated to a sub-saturating incident PFD of 220?mu mol?m-2?s-1 for continuous light. Using a duty cycle of 0.5, we observed that L/D cycles of 1 and 10?Hz resulted on average in a 10% lower biomass yield, but L/D cycles of 100?Hz resulted on average in a 35% higher biomass yield than the yield obtained in continuous light. Our results show that interaction of L/D cycle frequency, culture density and incident PFD play a role in overall PBR productivity. Hence, appropriate L/D cycle setting by mixing strategy appears as a possible way to reduce the effect that dark zone exposure impinges on biomass yield in microalgae cultivation. The results may find application in optimization of outdoor PBR design to maximize biomass yields. Biotechnol. Bioeng. 2012; 109: 2567-2574. (c) 2012 Wiley Periodicals, Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据