A. Mendes, Jefferson de Oliveira Daimon, Thamayne Valadares de Oliveira, Fernando Pederson Voll, R. Vieira, A. Mariano
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引用次数: 0
摘要
为了使藻类生物量成为燃料和生物产品的合适原料,必须设计一种实用的方法来脱水和浓缩藻类细胞。在本研究中,在低成本的陶瓷基板上开发了一种由微滤膜和絮凝剂组成的系统,用于高效收获斜四角蝇。研究了单宁基絮凝剂浓度、微藻浓度和pH对微滤的影响。通过实验计算了5400s的渗透通量,分析了总阻力和结垢机理。结果表明,饼式过滤模型最能反映数据。在pH为4和0.06 kg/m3的微藻(添加絮凝剂)条件下进行的实验结果表明,微藻的渗透通量/初始通量降低了39%。在最佳条件下,考察了临界通量、跨膜压力和污染机理对微滤的影响。将步进法应用于临界通量,得到渗透通量为2.2 ?纯m3m 2 s ? 1。70 kPa条件下渗透通量最高,为3.0 ?10?5 m3m?2s?1),通过改进的Hermia模型获得了较低的饼孔阻塞系数(k)。本研究表明,在低pH下使用Tanfloc可以最大限度地分离膜工艺中的微藻。
Effects of microalgal concentration and pH with flocculant on microfiltration
To make algal biomass a suitable feedstock for fuel and bioproducts, a practical way of dewatering and concentrating algal cells must be devised. In this study, a system comprising microfiltration membranes combined with a flocculant was developed on a low-cost ceramic substrate for efficient harvest of Tetradesmus obliquus. The effects of tannin-based flocculant concentration, microalgal concentration, and pH on microfiltration were studied. Permeate flux was evaluated for 5400 s through experiments to analyze the total resistance and the fouling mechanism. Results show that the cake filtration model best represented the data. The experiments at pH 4 and 0.06 kg/m3 of microalgae (with flocculant) showed improved results with reduction in J/J0 (permeate flux/initial flux) of 39%. In addition, the effects of critical flux, transmembrane pressure, and fouling mechanism on microfiltration were investigated under the best conditions studied. Application of the stepping method to the critical flux yielded permeate flux of 2.2 ? 10-5 m3m?2s?1. The 70 kPa condition showed the highest permeate flux (3.0 ? 10?5 m3m?2s?1) and a low cake pore blocking coefficient (k) obtained by the modified Hermia model. This study showed that the use of Tanfloc at low pH can maximize microalgal separation in membrane processes.
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