射流发泡与小球藻的批次气浮采收  

Generating of jet bubble and harvesting of chlorella biomass by air flotation

作　　者：林喆[1] 匡亚莉[1] 张海阳[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116

出　　处：《中国矿业大学学报》2012年第5期839-843,共5页Journal of China University of Mining & Technology

基　　金：江苏省自然科学基金项目(BK2010184)

摘　　要：采用射流微泡发生器为发泡装置,通过正交实验考察了藻液浓度、凝聚剂用量、絮凝剂用量、表面活性剂用量和充气时间对小球藻批次气浮采收的影响,对不同介质条件下射流微泡发生器的发泡特性进行了分析.结果表明,在正交组合条件下,采收率最高可达89.57%,凝聚剂用量和藻液浓度在置信水平为90%时影响显著;凝聚剂用量增大,采收率随之升高,但絮凝剂用量存在最优值20mg/L;射流微泡发生器可产生毫米级和微米级气泡,毫米级气泡用于药剂和藻细胞的混合,且受表面活性剂和无机盐的抑制兼并作用的影响明显,微米级气泡用于絮凝体的气浮采收,对介质条件不敏感,因此表面活性剂用量对采收率影响不明显;装置充气2s即可满足混合和气浮的需要,继续充气将使形成的絮凝体重新分散,不利于采收.By orthogonal experiments, the effects of microalgae cell concentration, dosages of coagulant, flocculant and surfactant and aeration time on recovery rate of harvesting chlorella sp were investigated using jet bubble generator and air flotation. The foaming characteristic of the jet bubble generator was also studied. The results show that the recovery rate reaches 89.57~/oo under experimental conditions. The coagulant dosage and cell concentration are the marked factors when the confidence level of 90%. The recovery rate increases with the increas- ing of coagulant dosage, and the optimal dosage of flocculant is 20 mg/L. The bubble genera- tor can produce millimeter and micron level bubbles, where the former are supposed to mix cells and agents and impacted signally by surfactant and salts, the latter contribute to floating the floes of chlorella cells and is insensitive to any agent. Hence, the surfactant does not affect the recovery rate significantly. Two seconds aeration time is enough for providing bubbles for mixture and flotation, or the recovery rate will decrease because of the redispersing of floes.

关 键 词：射流微泡发生器 气浮 小球藻 采收 

分 类 号：TQ028[化学工程]