饮用水中壬基酚的臭氧氧化降解研究

Degradation of Nonylphenol in Drinking Water by Ozone Oxidation

以饮用水中内分泌干扰物壬基酚为目标物,采用了臭氧氧化工艺对其进行降解,对臭氧降解过程动力学进行了研究,并考察pH与常见阴离子对降解过程的影响。结果表明:臭氧在合适条件下能够有效降解水溶液中的壬基酚。初始浓度为0.50、1.01、1.66 mg/L的壬基酚,采用浓度为10 mg.L-1的臭氧进行连续曝气氧化时,降解过程遵守一级动力学模型ln(C/C0)=-k t,R2>0.98,降解速率常数分别为0.201 4、0.166 7、0.170 9 min-1。pH的升高会对降解效果产生负面影响。在相同的反应条件下,体系pH从3.16上升到9.16,壬基酚的降解速率从0.233 7 min-1下降到了0.120 7 min-1。说明在臭氧降解壬基酚过程中臭氧分子的直接氧化方式贡献率大于自由基间接氧化的贡献率。

The kinetics in degradation process of nonylphenol, an endocrine disrupter, by ozonation was investigated in this paper. The operating parameters such as nonylphenol initial concentration, pH and anions were further discussed. Results showed that nonylphenol could be degraded effectively by ozonation. With a first - order kinetics in continuous ozone aeration system, when the initial concentration of nonylphenol was 0. 5,1.01,1.66 mg/L, the degradation rate were 0. 201 4, 0. 166 7 and 0. 170 9 min-1. The increases of pH would bring negative effects to the degradation of nonylphenol. The degradation rate constant k of nonylphenol decreased from 0. 233 7 min-l to 0. 1207 min-1 with pH increase from 3.16 to 9. 16.