Assessment of key biological and engineering design parameters for production of Chlorella zofingiensis (Chlorophyceae) in outdoor photobioreactors
| Autor: | Peter E. Zemke, Milton R. Sommerfeld, Qiang Hu |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
biology
Light Nitrogen Biomass Photobioreactor Chlorophyceae General Medicine Chlorella biology.organism_classification Lipid Metabolism Applied Microbiology and Biotechnology Photobioreactors Optical path Productivity (ecology) Agronomy Botany Production (economics) Carbohydrate Metabolism Chlorella zofingiensis Optical path length Biotechnology |
| Zdroj: | Applied microbiology and biotechnology. 97(12) |
| ISSN: | 1432-0614 |
| Popis: | For the design of a large field of vertical flat plate photobioreactors (PBRs), the effect of four design parameters-initial biomass concentration, optical path length, spacing, and orientation of PBRs-on the biochemical composition and productivity of Chlorella zofingiensis was investigated. A two-stage batch process was assumed in which inoculum is generated under nitrogen-sufficient conditions, followed by accumulation of lipids and carbohydrates in nitrogen-deplete conditions. For nitrogen-deplete conditions, productivity was the most sensitive to initial biomass concentration, as it affects the light availability to individual cells in the culture. An initial areal cell concentration of 50 g m(-2) inoculated into 3.8-cm optical path PBR resulted in the maximum production of lipids (2.42 ± 0.02 g m(-2) day(-1)) and carbohydrates (3.23 ± 0.21 g m(-2) day(-1)). Productivity was less sensitive to optical path length. Optical path lengths of 4.8 and 8.4 cm resulted in similar areal productivities (biomass, carbohydrate, and lipid) that were 20 % higher than a 2.4-cm optical path length. Under nitrogen-sufficient conditions, biomass productivity was 48 % higher in PBRs facing north-south during the winter compared to east-west, but orientation had little influence on biomass productivity during the spring and summer despite large differences in insolation. An optimal spacing could not be determined based on growth alone because a tradeoff was observed in which volumetric and PBR productivity increased as space between PBRs increased, but land productivity decreased. |
| Databáze: | OpenAIRE |
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