| Foam separation is known to have potential for separating and concentrating the material of surface activation using the medium of air bubble, Good separation effect was got especially disposaling trace components. It has many strongpoints, such as simple equipment, low cost, small area of occupation of land, meeting the changes of the quality and flow of the water. It has special advantage to separate sodium dodecyl benzene sulfonate which is surfactant, also no other material was needed to introduced in.In this paper, trace of LAS(sodium dodecyl benzene sulfonate) in the water was separated. A mass of experiments are done by the use of dissolve gas foam separation equipment. The influences of the operation parameters on removal efficiency are reviewed. Such as the density of bubbles, the concentration of surfactant, the gas-liquid ratio and circumfluence have different influences on the remove effect. When the concentration of LAS is 10 mg·L-1, the pressure of the foam separation pot is 0.26MPa, the gas-liquid ratio is 5 to 1, 50% circumfluence, the removal efficiency is 97.32%.According to the similar physical behaviors of foam separation process and chemical reaction process, the equivalent chemical reaction constant was introduced, then the macroscopical dynamics of using foam separation to remove cobalt ion from water was studied. The result indicated that the process of foam separation could be regarded as first order reaction, which equivalent speed constant is k = 0.0432s-1. Through measuring and analyzing the distribution of residence time, the average residence time is tm =475.02s, variance isσθ2= 0.607. The distribution density function of residence time is confirmed combined with the relevant experiments. The influence factors about the foam separation process removal efficiency of fluid flowing are studied. The mathematic model of this process was analysed and discussed combined with the residence time distribution function and variance. |
