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首页> 外文期刊>Journal of Environmental Science and Health >Environmental evaluation of flocculation efficiency in the separation of the microalgal biomass of Scenedesmus sp. cultivated in full-scale photobioreactors
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Environmental evaluation of flocculation efficiency in the separation of the microalgal biomass of Scenedesmus sp. cultivated in full-scale photobioreactors

机译：絮藻藻微生物质分离絮凝效率的环境评价。在全尺寸光生物反应器中培养

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In this paper the environmental evaluation of the separation process of the microalgal biomass Scenedesmus sp. from full-scale photobioreactors was carried out at the Research and Development Nucleus for Sustainable Energy (NPDEAS), with different flocculants (iron sulfate - FeCl3, sodium hydroxide - NaOH, calcium hydroxide - Ca(OH)(2) and aluminum sulphate Al-2(SO4)(3), by means of the life cycle assessment (LCA) methodology, using the SimaPro 7.3 software. Furthermore, the flocculation efficiency by means of optical density (OD) was also evaluated. The results indicated that FeCl3 and Al-2(SO4)(3) were highly effective for the recovery of microalgal biomass, greater than 95%. Though, when FeCl3 was used, there was an immediate change in color to the biomass after the orange colored salt was added, typical with the presence of iron, which may compromise the biomass use according to its purpose and Al-2(SO4)(3) is associated with the occurrence of Alzheimer's disease, restricting the application of biomass recovered through this process for nutritional purposes, for example. Therefore, it was observed that sodium hydroxide is an efficient flocculant, promoting recovery around 93.5% for the ideal concentration of 144mg per liter. It had the best environmental profile among the compared flocculant agents, since it did not cause visible changes in the biomass or compromise its use and had less impact in relation to acidification, eutrophication, global warming and human toxicity, among others. Thus, the results indicate that it is important to consider both flocculation efficiency aspects and environmental impacts to identify the best flocculants on an industrial scale, to optimize the process, with lower amount of flocculant and obtain the maximum biomass recovery and decrease the impact on the extraction, production, treatment and reuse of these chemical compounds to the environment. However, more studies are needed in order to evaluate energy efficiency of the process coupled with other microalgal biomass recovery technologies. In addition, studies with natural flocculants, other polymers and changes in pH are also needed, as these are produced in a more sustainable way than synthetic organic polymers and have the potential to generate a biomass free of undesirable contaminants.
机译：本文对微藻生物质Scendesmus sp。分离过程的环境评价。来自全尺寸光生物反应器的样品是在可持续能源研究与发展中心（NPDEAS）上进行的，使用了不同的絮凝剂（硫酸铁-FeCl3，氢氧化钠-NaOH，氢氧化钙-Ca（OH）（2）和硫酸铝Al- 2（SO4）（3），使用SimaPro 7.3软件，通过生命周期评估（LCA）方法，还通过光密度（OD）评估了絮凝效率，结果表明FeCl3和Al -2（SO4）（3）对微藻生物量的回收非常有效，大于95％，尽管当使用FeCl3时，添加橙色盐后，生物量的颜色会立即发生变化，典型的是铁的存在可能会根据其目的而损害生物质的利用，而Al-2（SO4）（3）与阿尔茨海默氏病的发生有关，例如，限制了通过该过程回收的生物质用于营养目的的应用。因此，据了解，氢氧化钠是一种有效的絮凝剂，对于144mg / L的理想浓度，其回收率约为93.5％。它在比较的絮凝剂中具有最佳的环境特征，因为它不会引起生物量的明显变化或损害其使用，并且对酸化，富营养化，全球变暖和人类毒性等的影响较小。因此，结果表明，重要的是要兼顾絮凝效率方面和环境影响，以在工业规模上确定最佳絮凝剂，以减少絮凝剂的用量来优化工艺，并获得最大的生物量回收率，并减少对絮凝剂的影响。这些化合物的提取，生产，处理和再利用到环境中。但是，需要更多的研究来评估该工艺的能源效率以及其他微藻生物质回收技术。此外，还需要对天然絮凝剂，其他聚合物和pH值进行研究，因为它们比合成有机聚合物以更可持续的方式生产，并且有可能产生不含不良污染物的生物质。

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