Velocity Field Structure and Flocculation Efficiency in Taylor-Couette Flow

Velocity field data were acquired for Taylor-Couette flow in the annulus gap between a rotating inner cylinder and a fixed concentric outer cylinder by using particle image velocimetry. The flocculation efficiencies were also obtained in the same Taylor-Couette flow under the conditions corresponding to the velocity field measurement. The flocculation efficiencies reached the maximum values due to the closed vortices, their contraction and expansion with time in wavy vortex flow. But out of the wavy vortex flow range, the comparatively low flocculation efficiencies were obtained due to the no-closed vortices which connected with each other.     

Effect of heat treatment on the properties of soy protein‐stabilised emulsions

The effect of heat treatment on the properties of soy protein‐stabilised emulsions was investigated. Emulsions were prepared with unheated and heat‐treated soy protein (NSP and HSP) dispersions. Heating on soy protein dispersions at 95 °C for 30 min resulted in smaller average oil droplet size, lower tendency for oil droplet flocculation, higher protein adsorption and lower viscosity. The properties of emulsions were significantly influenced by the protein concentration. The sodium dodecyl sulphate–polyacrylamide gel electrophoresis (SDS–PAGE) profiles showed that the heat treatment on soy protein dispersions increased the protein adsorption at O/W interface. The viscosity of all samples at low shear rate was inversely proportional to the d₃₂, suggesting a positive relation to the total interfacial area per unit volume. Emulsions showed shear‐thinning behaviour. The relaxation time was found to increase with aqueous phase viscosity determined by the Cross viscosity model.     

混合絮凝及周进周出沉淀池工艺设计

旺隆污水处理厂二期工程中,一级处理采用混合、絮凝、沉淀池工艺。设计采用机械混合、网格反应和周进周出矩形沉淀池的优化和改良方案,能够明显改善对悬浮物及胶体有机物的处理效果,减少后续构筑物的处理负荷和处理费用。     

“混凝”新释义及混凝技术

从混凝的工艺特点入手对混凝概念作出一个新定义。对水处理中混凝工艺的两个阶段-凝聚和絮凝的特点及其影响因素进行论述。通过理论分析，结合实际运行，指出实际生产中混凝阶段应注意的问题和适合的技术指标。     

Mitochondrial Associated Yeast Flocculation ‐The Effect of Acetylsalicylic Acid

Mitochondrial function is generally accepted as important for expression of yeast flocculation. In this study, a correlation between mitochondrial activity and flocculation is demonstrated using the XTT reduction assay. The mitochondrial activity of strongly flocculent cells was higher than those of weakly flocculent cells and cells cultivated in the presence of acetylsalicylic acid. Furthermore, we show the first oxylipin‐containing flocculation binding sites on yeast cell surfaces using scanning electron microscopy. We propose that in addition to zymolectin‐mediated flocculation, oxylipin interactions may also play a role in yeast flocculation.     

不同形式的絮凝反应池在给水应用中的比较

对能源中心供排水作业区几个净水站内不同形式的絮凝反应池在给水应用中的存在的优缺点进行了介绍比较，通过管理解决其在运行中可能存在的问题。     

选择性絮凝的方法及其机理(I)——增加或减少颗粒上的活性质点数法

选择性絮凝现有方法的分类可从吸附角度和动力角度两个大方面考虑。着重介绍从吸附角度考虑的增减颗粒上的活性质点数的方法,它包括选择合适的絮凝剂官能团、改变颗粒表面电位法、使用选择性分散剂法和近年来开发的SBA(质点阻塞剂)法等一些常用的方法。也对选择性絮凝方法的机理和分类规律进行了阐述。     

聚丙烯酰胺改性淀粉用于洗羊毛废水的处理

以聚丙烯酰胺改性淀粉作为化学絮凝剂对青海毛纺厂的洗毛废水进行絮凝处理，处理效果十分理想。COD及固体悬浮物去除率分别达95％及97％以上。絮凝污泥以溶剂甲苯进得革取回收，得羊毛脂。该法工艺简单，综合效益好，有工业推广价值。     

谈混凝沉淀烧杯试验标准的编制

影响水的混凝效果因素众多，如：浊度、色度、碱度和pH等，难以直接确定合适的混凝剂及加注量，而混凝沉淀试验是对水的混凝沉淀研究及指导生产的最有效方法。文章介绍混凝沉淀试验标准编制宗旨、主要内容及有关问题的说明。