硫辛酸生产废水的处理及资源化研究

STUDY ON THE TREATMENT AND RESOURCE REUSE OF LIPOIC ACID WASTEWATER

通过动态吸附试验,综合考虑吸附量、脱附效果确定资源化硫辛酸生产废水中硫辛酸的最佳树脂是NG-16大孔吸附树脂,最佳的工艺条件为:pH5～5.5,室温,吸附流量3BV·h-1,双柱串联处理量25BV.批-1,在30℃下,用3BV甲醇+2BV水脱附,流量为1BV·h-1,高浓度脱附液调pH至7.2～7.8,蒸馏回收硫辛酸和甲醇,低浓度脱附液套用,每吨废水可回收纯度80%左右的硫辛酸1.1kg。处理后废水中硫辛酸的质量浓度从1300～1500mg·L-1降为0,总硫的质量浓度从400～450mg·L-1降为0.05mg·L-1,B/C从0.30提高到0.65,为硫辛酸废水的后续处理提供了良好的条件。

The best resin which is used to recovery lipoic acid in lipoic acid wastewater is NG-16 macroporous adsorption resin. The result is determined by dynamic adsorption experiments. The optimal operation conditions are as follows： pH value of 5-5.5, at room temperature, adsorption flux of 3 BV.h^-1, double-column series disposing volume is 25 BV.batch^-1; at 30 ℃, the resin is desorbed by 3 BV methanol＋2 BV water, at 1 BV.h^-1 flux; the pH of high-concentration desorption solution is adjusted to 7.2-7.8, and lipoic acid and methanol are recoveried by distillation; low-concentration desorption liquid is applied for next batch. Per tonne of waste can be recoveried 1.1 kg lipoic acid about 80% purity. The lipoic acid content in treated wastewater is reduced from 1 300-1 500 mg.L^-1 to 0, the total sulfur content is reduced from 400-450 mg.L^-1 to 0.05 mg.L^-1, B/C increased from 0.30 to 0.65.