摘要：

以自制Fe₂O₃-CeO₂/γ-Al₂O₃为催化剂,采用催化湿式过氧化氢氧化法(CWPO)预处理有机磷农药废水,通过单因素和正交试验研究了过氧化氢投加量、起始pH、反应温度和反应时间对COD的去除效果及影响规律。结果表明,反应最优条件为H₂O₂投加量2 mL、起始pH=5、反应温度80℃、反应时间40 min,在此条件下COD的去除率可达85.8%,可生化性提高到B/C=0.43。运用一级动力学模型和Arrhenius经验公式,建立了催化湿式过氧化氢氧化降解COD的动力学方程。

关键词: 有机磷农药废水, 催化湿式过氧化氢, 正交试验, 动力学

Abstract:

With self-made Fe₂O₃-CeO₂/γ-Al₂O₃ as catalyst,the phosphate pesticide wastewater has been pretreated by catalytic wet peroxide oxidation(CWPO) process. The removing effect and influencing rules of the factors including dosage of H₂O₂,initial pH value,reaction temperature,and reaction time on the removing rate of COD are investigated through single factor experiments and orthogonal tests. The results show that the optimal COD removing efficiency is more than 85.8% and biodegradability of wastewater can be up to B/C=0.43,under the following conditions:the dosage of H₂O₂ is 2 mL,pH value 5,reaction temperature 80℃ and reaction time 40 min. The kinetics equation of catalytic wet peroxide oxidation of COD degradation has been established by using the first-order kinetics model and Arrhenius empirical formula.

Key words: organophosphorus pesticide wastewater, catalytic wet hydrogen peroxide oxidation, orthogonal test, kinetics

中图分类号: 

• X703.1