The effect of photon flux density on algal biofilm growth and internal fatty acid concentrations

详细信息    查看全文

• 作者：Peter J. Schnurr^a ; ^{Peter.schnurr@utoronto.ca" class="auth_mail" title="E-mail the corresponding author} ; George S. Espie^b ; ^{George.espie@utoronto.ca" class="auth_mail" title="E-mail the corresponding author} ; Grant D. Allen^a ; ^{dgrant.allen@utoronto.ca" class="auth_mail" title="E-mail the corresponding author}
• 关键词：FAME ; Fatty acid methyl ester ; PAR ; Photosynthetically active radiation ; PBR ; Photobioreactor ; LED ; Light emitting diode ; EPS ; Extracellular polymeric substances ; CPCC ; Canadian Phycological Culture Centre ; PFD ; Photon flux density
• 刊名：Algal Research
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：16
• 期：Complete
• 页码：349-356
• 全文大小：694 K

文摘

Algal biofilm systems offer potential advantages over planktonic systems for growing, harvesting and processing algal biomass. To determine how feasible these systems can be, however, researchers must determine optimal biomass and lipid productivities. In this paper the effect of photon flux density (PFD) on algal biofilm biomass productivities, internal fatty acid concentrations, and overall fatty acid productivity was studied. It was determined that as PFD increased, algal biofilm biomass productivities significantly increased until they peaked i.e. at about 300 μmol/m²/s, presumably due to light saturation. Increasing PFDs from 50 to 150 μmol/m²/s produced statistically significant increases in fatty acid concentrations from 5% to 8%; however, increasing PFDs beyond that range did not enhance lipid accumulation. Because of significant increases in biomass productivity with increased PFD, there was also a significant increase in fatty acid productivity with increased PFD. Lastly, increasing PFD resulted in diminishing returns of biomass productivity, suggesting that photons are not being effectively utilized at higher light intensities. This finding has implications for photobioreactor design and operation with artificial lighting.