Yin Shuchao, Wang Junfeng, Chen Lin, Liu Tianzhong
Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, Shandong, People's Republic of China,
Biotechnol Lett. 2015 Sep;37(9):1819-27. doi: 10.1007/s10529-015-1864-7. Epub 2015 May 21.
Biofilm cultivation of microalgae has great potential in many applications. However, the water footprint for this method has not been well assessed. This issue was explored with the microalga Haematococcus pluvialis.
Only 1.25 l water is sufficient to support 1 m(2) biofilm cultivation surface. To produce 1 kg Haematococcus biomass and astaxanthin, the water footprint could be as low as 35.7 and 1440 l, respectively, by sealing the biofilm in a narrow chamber and supplying the proper amount of nutrients if the evaporation water loss was not considered. However, when loss of water by evaporation was considered, the water footprint was as low as 66.9 and 2700 l, respectively, if the chamber was aerated with CO2 at 0.014 vvm. These water footprint values are much lower than values obtained in other research work.
The water footprint of biofilm microalgal cultivation can be potentially reduced by more than 90% if the biofilm is sealed in a narrow chamber and supplied with a slow aeration of CO2 as carbon source.
微藻的生物膜培养在许多应用中具有巨大潜力。然而，这种方法的水足迹尚未得到很好的评估。本研究以雨生红球藻为对象探讨了这一问题。
仅1.25升水就足以支持1平方米的生物膜培养表面。如果不考虑蒸发失水，通过将生物膜密封在狭窄腔室并供应适量营养物质，生产1千克雨生红球藻生物质和虾青素的水足迹可分别低至35.7升和1440升。然而，若考虑蒸发失水，当腔室以0.014 vvm的二氧化碳通气时，水足迹分别低至66.9升和2700升。这些水足迹值远低于其他研究工作中获得的值。
如果将生物膜密封在狭窄腔室并以缓慢通气的二氧化碳作为碳源供应，生物膜微藻培养的水足迹可能会降低90%以上。
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