Department of Environmental Technologies, Centro Andaluz de Ciencia y Tecnología Marinas (CACYTMAR), Campus de Excelencia Internacional del Mar (CEIMAR) Campus Universitario de Puerto Real, University of Cádiz, Puerto Real, Cádiz, Spain.
Int J Phytoremediation. 2013;15(8):774-88. doi: 10.1080/15226514.2012.735291.
Nitrogen and phosphorus concentration in the effluent of a wastewater treatment plant can vary significantly, which could affect the growth kinetic and chemical composition of microalgae when cultivated in this medium. The aim of this work was to study the rate of growth, nutrient removal and carbon dioxide biofixation as well as biomass composition of Scenedesmus obliquus (S. obliquus) when it is cultivated in wastewater at different nitrogen and phosphorus ratio, from 1:1 to 35:1. A more homogeneous method for calculating productivities in batch reactors was proposed. The proper N:P ratio for achieving optimum batch biomass productivity ranged between 9 and 13 (263 and 322 mg L(-1) d(-1) respectively). This was also the ratio range for achieving a total N and P removal. Above and below this range (9-13) the maximum biomass concentration changed, instead of the specific growth rate.The maximum carbon dioxide biofixation rate was achieved at N:P ratio between 13 and 22 (553 and 557 mg CO2 L(-1) d(-1) respectively). Lipid and crude protein content, both depend on the aging culture, reaching the maximum lipid content (34%) at the lowest N:P (1:1) and the maximum crude protein content (34.2%) at the highest N:P (35:1).
污水处理厂废水中的氮磷浓度变化很大，当在这种介质中培养微藻时，可能会影响微藻的生长动力学和化学成分。本研究的目的是研究在不同氮磷比（从 1:1 到 35:1）下，斜生栅藻（S. obliquus）在废水中的生长速率、养分去除和二氧化碳固定以及生物质组成。提出了一种更均匀的批量反应器生产力计算方法。实现最佳批量生物质生产力的适当 N:P 比在 9 到 13 之间（分别为 263 和 322 mg L(-1) d(-1)）。这也是实现总氮和磷去除的比值范围。在此范围（9-13）之上和之下，变化的是最大生物质浓度，而不是比生长速率。在 N:P 比为 13 到 22 之间时，达到最大的二氧化碳固定率（分别为 553 和 557 mg CO2 L(-1) d(-1)）。脂质和粗蛋白含量都取决于老化培养，在最低的 N:P（1:1）下达到最大的脂质含量（34%），在最高的 N:P（35:1）下达到最大的粗蛋白含量（34.2%）。
