催化湿式氧化技术处理山梨酸生产废水的研究

Treatment of sorbic acid production wastewater by catalytic wet air oxidation

采用催化湿式氧化技术处理生产山梨酸过程中产生的高浓度有机废水,对催化剂组分进行优选,对反应温度、O2分压(PO2)和废水pH等工艺条件进行考察。实验结果表明:采用自制CuO-Cr2O3-La2O3/TiO2为复合催化剂处理该有机废水时表现出较好的催化活性;在190℃、PO2=2.1 MPa、pH=6.1、COD=10 030.0 mg/L时,反应90 min的COD去除率达到98.3%,而在相同条件下未加催化剂的湿式氧化的COD去除率只有60.1%。

Catalytic wet air oxidation was performed on a sorbic acid production wastewater sample （COD= 10 030.0 mg/L, pH= 6. 1） using TiO2 catalysts with and without impregnation of CuO or CuO＋Cr2O3 and/or La2O3. The effects of the metal impregnation, reaction temperature, pH and oxygen pressure were determined. Using the CuO-Cr2 O3-La2 O3/TiO2 catalyst, the catalytic wet air oxidation treatment performed at 190 ℃, Po2 = 2.1 MPa and pH=6.1 accomplished 98.3% COD reduction in 90 rain （final COD=170.5 mg/L）, while the same treatment using the base TiO2 catalyst achieved only 60.1% reduction （final COD=4 001.9 mg/L）.