LNEG-Laboratório Nacional de Engenharia e Geologia, I.P. Unidade de Bioenergia, Estrada do Paço do Lumiar 22, 1649-038 Lisboa, Portugal.
Universidade Federal de Lavras, Programa de Pós-Graduação Fitotecnia/Agronomia, Lavras, Brazil.
Bioresour Technol. 2015 May;184:230-235. doi: 10.1016/j.biortech.2014.10.064. Epub 2014 Oct 30.
The aim of the present work was the simultaneous treatment of urban wastewater using microalgae and the energetic valorization of the obtained biomass. Chlorella vulgaris (Cv), Scenedesmus obliquus (Sc) and a naturally occurring algal Consortium C (ConsC) were grown in an urban wastewater. The nutrient removals were quite high and the treated water fits the legislation (PT Dec-Lei 236/98) in what concerns the parameters analysed (N, P, COD). After nutrient depletion the microalgae remained two more weeks in the photobioreactor (PBR) under nutritional stress conditions, to induce sugar accumulation (22-43%). The stressed biomass was converted into biohydrogen (bioH2), a clean energy carrier, through dark fermentation by a strain of the bacteria Enterobacter aerogenes. The fermentation kinetics were monitored and fitted to a modified Gompertz model. The highest bioH2 production yield was obtained for S. obliquus (56.8 mL H2/gVS) which was very similar when using the same algae grown in synthetic media.
本工作的目的是利用微藻同时处理城市废水，并对获得的生物质进行能源化利用。在城市废水中培养了普通小球藻（Cv）、斜生栅藻（Sc）和一种自然发生的藻联合培养物 C（ConsC）。营养物质的去除率相当高，处理后的水符合法规（PT Dec-Lei 236/98）中分析的参数（N、P、COD）。在营养物质耗尽后，微藻在光生物反应器（PBR）中在营养胁迫条件下再停留两周，以诱导糖积累（22-43%）。通过一株产气肠杆菌的暗发酵，将应激生物质转化为生物氢（bioH2），一种清洁能源载体。监测发酵动力学并将其拟合到改进的 Gompertz 模型。斜生栅藻获得的生物氢产量最高（56.8 mL H2/gVS），与在合成培养基中生长的相同藻类相比非常相似。
