沉淀—树脂吸附法处理对氨基偶氮苯盐酸盐生产废水的研究

TREATMENT OF P AMINOAZOBENZENE HYDROCHLORIDE SALT WASTEWATER BY SEDIMENTATION—RESIN ADSORPTION

对氨基偶氮苯盐酸盐（ＰＡＢＳ）是生产染料的重要中间体。在ＰＡＢＳ生产过程中，排放出高浓度（ＣＯＤ４万～８万ｍｇ／Ｌ）、高色度（４万～８万）、高毒性（含苯胺和对氨基偶氮苯）和高氯（Ｃｌ－４万～１０万ｍｇ／Ｌ）的废水。利用中和沉淀—大孔吸附树脂吸附法进行了处理工艺的小试研究。结果表明，废水色度去除率达到９９９％，降到２０以下；出水中基本不含对氨基偶氮苯（ＰＡＢ）；出水中苯胺的浓度降到３ｍｇ／Ｌ。ＧＣ／ＭＳ分析的结果表明，乙醇脱附液中苯胺是最主要的有机物，所以利用该工艺能实现苯胺的回收。

P aminoazobenzene hydrochloride salt is an important intermediate of dyestuff. Terrible wastewater with high concentration (COD 40,000～80,000mg/L),high color(40,000～80,000), high toxicity(containing aniline and P aminoazobenzene) and high chloride ion(40,000～100,000mg/L) is discharged from the production process. In this paper, sedimentation— resin adsorption is applied to treat this kind of wastewater. It is indicated that decolorization efficiency is up to 99.9%, so that color can be reduced to less than 20;in the effluent, P aminoazobenzene is not found; the concentration of aniline can be below 3mg/L. From the analytical result of GC/MS, aniline is the staple organic substance in the desorption effluent, which means that aniline can be recovered by the process.