印染废水催化湿式氧化法处理中水质酸碱度的变化

Diversification of acidity and alkalinity in printing and dyeing wastewater treated by CWAO technology

以初始质量浓度为1088 mg/L、色度为30万倍的亚甲蓝溶液模拟印染废水进行实验,系统考察了印染废水催化湿式氧化(CWAO)法处理中水质酸碱度的变化。结果表明,处理后出水pH呈先降低后升高的趋势,而且反应前期pH降低的幅度大,反应后期pH升高的幅度小;出水中pH最低点随Cu1Fe1催化剂(Cu2+、Fe2+质量比为1∶1)投加量的增加、氧分压的升高、进水pH的降低而降低;反应温度越高,出水pH越先达到最低点;反应终点出水pH随Cu1Fe1催化剂投加量的增加、氧分压的升高、反应温度的升高、进水pH的升高而升高。

Catalytic wet air oxidation （CWAO） technology was employed for the treatment of simulant printing and dyeing wastewater. Methylene blue （MB） aqueous solution with chromaticity of ten thousand times was selected as simulated printing and dyeing wastewater, and CulFel was selected as homogeneous catalyst. The diversification of acidity and alkalinity in simulated wastewater during CWAO process was investigated. The results showed that the diversification of pH was divided into two phases： rapidly descending and slowly ascending. The descending rate was quick at first and then slow down. The effluent pH dropped at the lowest point and hoisted at the highest point with the increase of catalyst dosage, oxygen pressure and reaction temperature. The effluent pH dropped at both the lowest point and the highest point with the decrease of influent pH.