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以改性蔗渣灰(MBA)为吸附剂,通过单因素实验,等温吸附模型拟合实验和正交实验,探讨了MBA去除糖蜜酒精废液的高浓度硫酸根离子的实验条件。结果表明,当MBA粒径60目,投加量为3 g·(25 m L)~(-1),反应温度45℃,pH为4.2,反应时间50 min时,溶液中的硫酸盐去除效果最优。等温吸附模型拟合结果表明,Langmuir模型更适合拟合该过程,MBA去除硫酸根离的反应为单分子层吸附。正交实验次优反应条件可以确定为:废液浓度为稀释15倍,MBA投加量3.0 g·(25 m L)~(-1),MBA粒径80目,反应时间1 h,反应温度为35℃。经验证,硫酸根离子的去除率达到88.86%。
The modified bagasse ash (MBA) was used as adsorbent to study the experimental conditions of high concentration of sulfate ion removed by MBA by using single factor experiment, isothermal adsorption model fitting experiment and orthogonal experiment. The results showed that when the particle size of MBA was 60 mesh, the dosage was 3 g · (25 m L) -1, the reaction temperature was 45 ℃, the pH was 4.2 and the reaction time was 50 min, the sulfate removal efficiency Optimal. The fitting results of the isothermal adsorption model show that the Langmuir model is more suitable for fitting the process, and the reaction of removing the sulfate ion by the MBA is the monolayer adsorption. The optimum reaction conditions for orthogonal experiment were as follows: the concentration of waste liquor was 15 times dilution, MBA dosage was 3.0 g · (-1), MBA size was 80 mesh, reaction time was 1 h, reaction temperature 35 ° C. It has been verified that the removal rate of sulfate ions reaches 88.86%.