羧甲基壳聚糖处理印染废水实验研究

Experimental Study on the Treatment of Printing and Dyeing Wastewater with Carboxymethyl Chitin

目的研究羧甲基壳聚糖(CM-CHO)处理水溶性染料废水脱色的工艺条件,为实际印染废水的脱色处理提供参考数据.方法采用羧甲基壳聚糖对活性红染料溶液和毛巾厂的印染废水进行混凝处理,通过研究pH值、投加量、沉降时间和搅拌强度对脱色效果的影响,确定适宜的操作条件;同时对比了羧甲基壳聚糖和壳聚糖对实际废水的处理效果.结果实验表明,pH、投加量和沉降时间对脱色效果影响很大,而快速和慢速搅拌时间对其影响不明显.结论羧甲基壳聚糖对水溶性染料废水及实际印染废水具有良好的脱色效果.对水溶性染料废水,在pH=9.0,投加量在50 mg/L下有最好的脱色效果,脱色率达90%以上.在相同的工艺条件下,羧甲基壳聚糖处理效果优于壳聚糖.羧甲基壳聚糖对印染废水的混凝处理可作为实际废水处理的前处理.

In order to find an effective treatment process for printing and dyeing wastewater, the study on the treatment of water-soluble dyeing wastewater with Carboxymethyl chitin is carried out. This study is devoted to the effects of pH, amount of addition, mixing time and setting time on the decolorization of the effluent by using carboxymethyl chitin to coagulate the reactive red dye solution and the printing and dyeing wastewater from printing and dyeing mills. Then the optimal technological condition of the decolorization of the dyeing and printing wastewater is determined. Meanwhile, the treating effect of carboxymethyl is contrasted with that of chitin. The results of the experiment show that pH, amount of addition and setting time have strong effect, but the mixing time has slight influence on the rate of decolorization. In conclusion, carboxymethyl chitin has a good decolorizing effect on water-soluble dye and dyeing effluent from textile printing. A satisfactory rate of decolorization, which is up to 90 %, can be attainted at pH = 9.0 and when the amount of addition is 50mg/L. Under the same process and technological condition, the treating effect of carboxymethyl chitin is better than that of chitin. The coagulating treatment of printing and dyeing wastewater with carboxymethyl chitin can be done in the practical pretreatment.