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首页> 外文期刊>Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies >Potential pre-concentration methods for Nannochloropsis gaditana and a comparative study of pre-concentrated sample properties
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Potential pre-concentration methods for Nannochloropsis gaditana and a comparative study of pre-concentrated sample properties

机译:Nannochloropsis gaditana的潜在预浓缩方法和预浓缩样品特性的比较研究

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摘要

We compared potential pre-concentration techniques for Nannochloropsis gaditana (Nng) by testing natural sedimentation; flocculation with aluminium sulphate, polyaluminium chloride and chitosan; and induced pH. Promising flocculation efficiencies and concentration factors were obtained in a short time with alkalinity-induced flocculation at an adjusted pH of 9.7 and with chitosan at an adjusted pH of 9.9 using a concentration of 30mgL~(-1). The sedimentation rates of alkalinity-induced flocculation were also evaluated. Additionally, viscosity, particle size distribution and Ca/Mg ions were analysed for pre-concentrated samples of N. gaditana (Nng) and the previously studied Phaeodactylum tricornutum (Pht) which were obtained by various different harvesting methods under optimal conditions. The rheological properties of the concentrated algae suspensions of two microalgal species showed Newtonian behaviour. The mean diameters of the flocs were between 39 and 48μm. The Ca/Mg analysis showed that Mg~(+2) is the triggering ion for alkalinity-induced flocculation in the conditions studied.
机译:我们通过测试自然沉降来比较Nannochloropsis gaditana(Nng)的潜在预浓缩技术。用硫酸铝,聚氯化铝和壳聚糖絮凝;并诱导pH。在浓度为30mgL〜(-1)的条件下,在碱度诱导的絮凝度为9.7的条件下,壳聚糖在pH值为9.9的条件下,在短时间内获得了令人满意的絮凝效率和浓缩因子。还评估了碱度引起的絮凝的沉降速率。此外,还分析了在最佳条件下通过各种不同收割方法获得的加迪纳猪笼草(Nng)和先前研究过的三角藻(Paeodactylum tricornutum)(Pht)的预浓缩样品的粘度,粒度分布和Ca / Mg离子。两种微藻类的浓缩藻类悬浮液的流变特性显示出牛顿行为。絮状物的平均直径在39至48μm之间。 Ca / Mg分析表明,在所研究的条件下,Mg〜(+2)是碱度诱导絮凝的触发离子。

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