School of Ocean Sciences, College of Natural Sciences, Bangor University, Askew Street, Menai Bridge, Isle of Anglesey LL59 5AB, UK.
Bioresour Technol. 2011 May;102(10):5775-87. doi: 10.1016/j.biortech.2011.02.025. Epub 2011 Mar 4.
This work examined the energy return of Chlorella vulgaris and Dunaliella tertiolecta cultivated in a gas-sparged photobioreactor design where the power input for sparging was manipulated (10, 20, and 50 Wm(-3)). Dry weight, organic carbon and heating values of the biomass were measured, plus a suite of variables including Fv/Fm and dissolved oxygen. A model for predicting the higher heating value of microalgal biomass was developed and used to measure the energetic performance of batch cultivations. High power inputs enhanced maximum biomass yields, but did not improve the energy return. Cultivation in 10 Wm(-3) showed up to a 39% higher cumulative net energy return than 50 Wm(-3), and increased the cumulative net energy ratio up to fourfold. The highest net energy ratio for power input was 19.3 (D. tertiolecta, 12% CO(2), 10 Wm(-3)). These systems may be a sustainable method of biomass production, but their effectiveness is sensitive to operational parameters.
本研究考察了在充气式光生物反应器中培养的普通小球藻和盐藻的能量回报，其中充气的功率输入可进行调控（10、20 和 50 Wm(-3))。测量了生物质的干重、有机碳和发热值，以及一系列变量，包括 Fv/Fm 和溶解氧。开发了一种预测微藻生物质高热值的模型，并用于测量分批培养的能量性能。高功率输入可提高最大生物质产量，但不能提高能量回报。在 10 Wm(-3)下培养比在 50 Wm(-3)下培养的累积净能量回报高出 39%，并将累积净能量比提高了四倍。对于功率输入，最高的净能量比为 19.3（D. tertiolecta，12% CO(2)，10 Wm(-3))。这些系统可能是一种可持续的生物质生产方法，但它们的有效性对操作参数敏感。
