紫外降解四溴双酚A影响因素及动力学研究

摘要

采用紫外(UV)光解技术作为四溴双酚A(TBBPA)工业废水的预氧化技术,考察了光照时间、pH值、TBBPA浓度、紫外辐射强度等因素对降解TBBPA效果的影响.结果表明:紫外光解可有效改善TBBPA工业废水的可生化性,在pH=11、TBBPA初始浓度为50 mg/L,紫外辐射强度为8mW/cm2,温度控制在25℃条件下,反应210 min,B/C可提高至0.28.同时,各影响因素下TBBPA动力学降解特性的研究表明,TBBPA的光解过程符合一级反应动力学模型.%In this paper, UV degradation as a pre-treatment technology is used to improve the biodegradability of wastewater containing tetrabromobisphenol-A (TBBPA). The effect factors of irradiation time, initial pH,initial concentration of TBBPA and UV light intensity are investigated in the process. The results indicate that under the conditions ofp(TBBPA) =50 mg/L, pH = 11.0, UV light intensity is 8 mW/cm2, temperature is 25 ℃ and reaction time is 210 min, the biodegradability of the wastewater containing TBBPA could be effectively improved by UV degradation, and the ratio of BOD to COD is increased from 0 to 0. 28. Moreover, results of kinetic test show that TBBPA photodegradation in different condition tests follows the first-order.