期刊
BIOMASS & BIOENERGY
卷 109, 期 -, 页码 47-53出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2017.12.017
关键词
Attached microalgae cultivation; Suspended-solid phase photobioreactor; Nutrient concentration; Harvest; Microalgae biofilm; Cell composition
资金
- China National Science Fund Key Program [51138006]
- Science Fund for Creative Research Group [21221004]
Attached microalgae cultivation is an effective way to decrease the high harvesting cost in microalgae biomass production. Nitrogen and phosphorus, as the two main nutrients, are hypothesized to influence the attachment efficiency and growth of microalgae. The attached growth of Scenedesmus. LX1 in the suspended-solid phase photobioreactor (ssPBR)(1) with feed composed of different total nitrogen (TN) and total phosphorus (TP) concentrations was studied in this paper. The productivity of attached microalgae on Day 3 (3 x 10(6) cells.cm(-3)) at the nutrient levels of TN = 15 gm(-3) and TP = 5 or 3 gm(-3) was approximately 70% higher than that at relatively high-nutrient levels (i.e. TN = 150 gm(-3) and TP = 10 or 15 gm(-3)). Under the nutrient levels of TN = 15 gm(-3) and TP = 5, 3, 1.5, 0.5 gm(-3), the average TN and TP concentrations in the microenvironment around microalgae biofilm were about 2.1 and 15.5 times higher than those of the bulk media, respectively. The higher nutrient concentration in the surrounding microenvironment of microalgae biofilm improved protein synthesis of attached microalgae compared to the suspended ones within the same reactor, especially at the late stage of batch cultivation.
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