摘要：

与湿式空气氧化相比, 催化湿式氧化可以在温和条件下达到较好的废水处理效果。考察了CuO/η-Al₂O₃和活性炭两种催化剂处理苯酚废水的催化效果, 结果表明在温和条件下可以达到较高COD去除率 :在 14 0℃下, 催化湿式氧化 1h, COD_Cr去除率分别达到 93.2 %和 88.4 %。在 16 0℃下, 催化湿式氧化 1h, COD_Cr去除率分别达到 93.4 %和 90.1%。在 14 0℃下, 苯酚废水经过湿式空气氧化 1h后, BOD₅/COD_Cr仅仅达到 0.08, 不适合后续生物法处理 ;使用活性炭催化剂, BOD₅/COD_Cr达到了0.18, 而使用CuO/η-Al₂O₃催化剂,BOD₅/COD_Cr达到了0.30, 因此, 用CuO/η-Al₂O₃催化剂处理苯酚废水可以在较低温度下达到预处理效果。

关键词: 催化湿式氧化, 含酚废水, 预处理, 生物降解性

Abstract:

Compared with wet air oxidation, catalytic wet air oxidation has better effect on treating wastewater under mild conditions. Two kinds of catalyst are prepared:CuO/η-Al₂O₃and AC catalysts. Firstly, the effect of these catalysts on catalytic wet air oxidation to be used in phenol wastewater treatment under different conditions is evaluated. The results show that raising pH value in the solution has disadvantageous effect on the removal of COD_Cr from phenol wastewater. As to CuO/η-Al₂O₃ and AC catalysts, the COD_Cr removal rate is higher under mild conditions:after 1 h reaction time, at 140 ℃, the COD_Cr removal rate reaches 93. 2% and 88. 4% respectively;and at 160 ℃, the COD_Cr removal rate reaches 93. 4% and 90. 1% respectively. But at 140 ℃, after the phenol wastewater is treated by wet air oxidation for 1 h, the BOD₅/COD_Cr reaches only 0. 08. The effect of different biodegradability is resulted from using different catalysts. BOD₅/COD_Cr reaches 0. 30 by using catalyst CuO/η-Al₂O₃, while BOD₅/COD_Cr reaches 0.18 by using catalyst activated carbon as catalyst. Therefore using CuO/η-Al₂O₃ as catalyst to treat phenol wastewater can get the pretreatment effect under lower temperature.

Key words: catalytic wet air oxidation, phenol wastewater, pretreatment, biodegradability

中图分类号: 

• X703.1