印染废水的复合絮凝剂脱色

Decolorization of dyeing effluents with composite flocculant

研究了无机絮凝剂、有机絮凝剂及有机-无机复配絮凝剂对染料废水的脱色效果,探讨了投加量、pH值、复配比等对脱色效果的影响。结果表明,有机高分子絮凝剂与无机絮凝剂复配,可以明显提高脱色效果。用复配絮凝剂处理染料溶液时,对不同染料的脱色效果不同,最佳pH值范围也不同。复配絮凝剂对于直接红BWS和酸性红N-3BL染料的增效作用比对活性红BF-DB的大。用复配絮凝剂处理实际印染废水的优化条件为:有机絮凝剂和硫酸铝的投加量分别为120 mg/L和80 mg/L,pH值为6～7。在此条件下,实际印染废水的脱色率可达96.8%,COD去除率达80.6%。

The decolorization of dyeing and finishing effluents with inorganic flocculant, organic flocculant as well as organic and inorganic compound flocculant are studied. The influences of the dosage, pH value and the compound ratio of the flocculants on decolorization effect are discussed. The results show that the compound of the organic polymer and inorganic flocculant can obviously improve the decolorization effect. When the compound flocculant is applied to dyes solution, it appears that different dyes have different decolorization rate and optimal pH value range. The synergistic actions to Direct Red BWS and Acid Red N- 3BL are better than that to Reactive Red BF-DB. When the compound flocculant is applied to practical printing and dyeing efflu- ents, the optimum conditions are as follows： the dosages of organic polymer flocculant and aluminum salt flocculant are 120 mg/L and 80 mg/L respectively, and treating at pH value of 6 -7. The decolorization rate can reach 96.8% and the removal of COD can reach 80.6%.