微电解预处理靛蓝牛仔布印染废水

Pretreatment of indigo jean dyeing wastewater by iron-carbon micro-electrolysis process

靛蓝牛仔布印染废水组分复杂,浓度高、水量大,属于难处理的工业废水,为了有效降低后续生物处理单元的负荷,采用铁炭微电解工艺对该废水进行预处理;通过正交实验考察pH、反应时间及铁炭比处理效果的影响规律及COD去除反应动力学,并对各因素作了单因素影响实验,确定了最佳工艺条件。结果表明,铁炭微电解法是预处理靛蓝牛仔布印染废水的一种有效方法,在Fe/C为2∶1、pH为3的条件下反应90 min,铁炭微电解出水COD的去除率在49.2%,色度去除率达到80%,该印染废水经微电解处理后,BOD5/COD比值可从原来的0.248上升至0.436,可生化性明显提高。此外,微电解预处理靛蓝牛仔布印染废水中COD的去除反应符合二级反应动力学规律。

Indigo jean dyeing wastewater is a kind of unmanageable wastewater because it has complicated constituents, the concentration is high and the quantity of wastewater is large. To effectively reduce the burthen of the following biological treatment, iron-carbon micro-electrolysis was applied to treat indigo jean dyeing wastewater in this experiment. The influences of the three factors including pH, reaction time and the ratio of I- ron-carbon were investigated with the orthogonal test, every influencing factor was tested. Finally, the optimal process conditions were ascertained. The experimental results showed when the ratio of iron and carbon was 2： 1, the pH was 3, the reaction time was 90 min, the removal rate of COD by iron-carbon micro-electrolysis process was 49.2%.