Division of Marine Biosciences, Graduate School of Fisheries Sciences, Hokkaido University, Minato 3-1-1, Hakodate 041-8611, Japan.
Water Res. 2012 Jun 1;46(9):3094-100. doi: 10.1016/j.watres.2012.03.016. Epub 2012 Mar 21.
In this study, o/w emulsion flotation experiments were conducted by adding methylated milk casein (MeSC). Emulsion used in this study was prepared by ultrasonic emulsification of heavy oil (bunker-A) and sodium dodecyl sulfate (SDS) solution. A simple kinetic model was proposed to estimate the removal rate of the oil droplets within the column. The model was based on main assumption that adsorption of single droplet adsorbed MeCS or floc onto bubble surface within flotation column. Removal rate constant, K, was defined by k(a)X(s) (S(b)τ/V), where k(a) and X(s) are overall adsorption rate and saturated adsorption density of oil droplet or floc, S(b), τ and V are bubble surface production rate, retention time of bubble swarms and emulsion volume within the column, respectively. The experiments were conducted with varying operating conditions; superficial gas velocity, column dimension and emulsion volume. K was evaluated from slope value of obtained straight line by plotting time versus ln (T/T(0)), where T/T(0) is relative turbidity. K was mostly proportional to (S(b)τ/V), which corresponds to specific surface area of bubble swarms per unit volume within the column, in the present experimental region. This result suggested that efficiency of this removal process was mainly controlled by the specific surface area of bubble swarms, and proposed model was fundamentally verified.
在这项研究中，通过添加甲基化牛奶蛋白（MeSC）进行了 o/w 乳状液浮选实验。本研究中使用的乳液是通过超声乳化重油（燃料油 A）和十二烷基硫酸钠（SDS）溶液制备的。提出了一个简单的动力学模型来估计柱内油滴的去除速率。该模型基于以下主要假设：单个液滴吸附 MeCS 或絮体在浮选柱内的气泡表面上的吸附。去除速率常数 K 定义为 k(a)X(s)（S(b)τ/V），其中 k(a)和 X(s)分别是油滴或絮体的总吸附速率和饱和吸附密度，S(b)、τ和 V 分别是气泡表面生成速率、气泡群的保留时间和柱内乳液体积。实验在不同的操作条件下进行；表观气速、柱尺寸和乳液体积。通过绘制时间与 ln(T/T(0))的关系图，从得到的直线的斜率值来评估 K，其中 T/T(0)是相对浊度。在本实验区域内，K 与（S(b)τ/V）成正比，这对应于柱内单位体积内气泡群的比表面积。这一结果表明，该去除过程的效率主要受气泡群的比表面积控制，提出的模型得到了基本验证。
