絮凝-吸附工艺联合处理1,2,4-酸废水

TREATMENT OF 1,2,4-ACID WASTEWATER COMBINED FLOCCULATION WITH ADSORPTION PROCESS

研究6-硝生产过程中产生的1,2,4-酸废水的处理工艺。采用絮凝和吸附手段处理1,2,4-酸废水,絮凝试验采用自制的双氰胺-甲醛聚合物为絮凝剂的絮凝体系;吸附试验采用自制的AEO-9改性的膨润土作为吸附剂。试验结果表明,以双氰胺-甲醛絮凝剂絮凝处理废水的最佳条件为:废水的pH=3,絮凝剂用量为1%,在70℃的水浴锅中快速搅拌2 min,慢搅10 min,最后静置40 min,COD去除率可以达到83.7%;在吸附试验中,用自制的AEO-9插层改性制得的有机膨润土进行吸附,吸附最佳工艺条件为:pH为8,吸附时间30 min,吸附剂用量为5%,吸附温度影响不大。以实验室自制的膨润土处理1,2,4-酸生产废水,废水COD去除率为73.81%,废水COD降到3599mg.L-1。先絮凝后吸附较先吸附后絮凝效果更好,且能达到较高水平,废水COD由原来13 742 mg.L-1降到253 mg.L-1,COD去除率达到98.16%。

This article mainly combined flocculation with adsorption process to treat with 1,2,4-acid waste water.The flocculation experiment used dicyandiamide formaldehyde as the flocculant.The adsorption experiment,organic bentonite being as adsorbent,AEO-9 surfactant as modifier.The optic flocculation conditions was： the wastewater pH value for 3,flocculants to waste water at the ratio of 1%,stirred quickly for 2 min and slowly for 10 min at 70 ℃,standing for 40 min.COD removal rate reached 83.7%.The optic adsorption conditions was： the wastewater pH value for 8,adsorption time 30 min,the dosage of adsorption was 5%,at room temperature,COD removal rate reached 73.81%.The process that adsorption after flocculation had more wastewater treat effectiveness than the flocculation process after adsorption process.