催化湿式过氧化氢氧化预处理有机磷农药废水的研究

Study on catalytic wet hydrogen peroxide oxidation for the pretreatment of organophosphorus pesticide wastewater

以自制Fe2O3-Ce O2/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p H、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 m L、起始p H=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。

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.