聚合氯化铝絮凝小球藻的动力学研究  

Flocculation Kinetics of Chlorella sp. with Polymeric Aluminum Chloride

作　　者：丁进锋[1] 赵凤敏[1] 曹有福[1] 梅帅[1] 李树君[1] 

机构地区：[1]中国农业机械化科学研究院,北京100083

出　　处：《农业机械学报》2015年第3期203-207,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家国际科技合作项目(2010DFB63750)

摘　　要：以聚合氯化铝(PAC)作为絮凝剂,探讨其对小球藻的絮凝效果及其动力学模型,并对其实际应用的成本进行了评价。向藻液中添加不同剂量PAC,经搅拌后分别于不同时间下测定藻液中叶绿素含量。结果表明:5种不同剂量PAC在8 min内均能高效絮凝小球藻,絮凝效率在86%以上,随着PAC质量浓度的增大,小球藻的絮凝效率也提高,质量浓度为123.5 mg/L时絮凝效率达到了98.6%,铝残留量为132.8 mg/kg。PAC絮凝微藻是电荷中和和卷扫絮凝共同作用结果。絮凝1 kg小球藻生物质,成本为266.04元,比离心法的853.39元降低68.8%。PAC絮凝小球藻数据拟合结果符合二级动力学模型。Harvesting is one of the most critical processes in large scale microalgae culture, which occupies 20% -30% of total costs. As a flocculant, flocculation effect and kinetics of PAC were investigated on harvesting Chlorella sp. , and the economic evaluation for harvesting microalgae was conducted. Different dosages of PAC were added into microalgae suspension, after stirring at 200 r/min for 1 rain, the content of Chlorophyll was measured at different time. The results showed that five different dosages of PAC exhibited a high flocculation efficiency over 86% after 8 rain. The flocculation efficiency increased significantly （P 〈 0.05） with increasing PAC dosage. The flocculation efficiency reached to 98.6% when the dosage of PAC was 123.5 mg/L, and the residual aluminum concentration was 132.8 mg/kg in ChloreUa sp. biomass. The flocculation mechanism of PAC was charge neutralization and sweeping flocculation, which acted in combination. And the cost was RMB ￥266.04 when flocculating microalgae biomass was 1 kg, which was 68.8% lower than the cost of RMB ￥853.39 by centrifugation. The results of indicated that the flocculation of PAC obeyed the second order kinetics. Flocculation with PAC is feasible for harvesting microalgae.

关 键 词：小球藻 聚合氯化铝 絮凝 动力学 

分 类 号：S216.2[农业科学—农业机械化工程]