The performance of UV/H 2O 2, UV/O 3 and UV/H 2O 2/O 3 oxidation systems for treating spent caustic from an ethylene plant was investigated. In UV/H 2O 2 system, with the increase of H 2O 2 dosage, removal e...The performance of UV/H 2O 2, UV/O 3 and UV/H 2O 2/O 3 oxidation systems for treating spent caustic from an ethylene plant was investigated. In UV/H 2O 2 system, with the increase of H 2O 2 dosage, removal efficiencies of COD and the ratio of biochemical oxygen demand(BOD) to chemical oxygen demand(COD) of the effluent were increased and a better performance was obtained than the H 2O 2 system alone. In UV/H 2O 2 system, removal efficiency of COD reach 68% under the optimum condition, and BOD/COD ratio was significantly increased from 0 22 to 0 52. In UV/O 3 system, with the increase of O 3 dosage, removal efficiency of COD and BOD/COD ratio were increased, and a better performance was obtained than the O 3 system alone. Under the optimum condition, removal efficiency of COD was 54%, and BOD/COD ratio was significantly increased from 0 22 to 0 48. In UV/H 2O 2/O 3 system, COD removal efficiency was found to be 22.0% higher than UV/O 3 system.展开更多
利用光催化O3氧化技术降解油田采出水中2种典型多环芳烃(PAHs)萘和芴,考察了UV-O3和UV-TiO2-O32种氧化体系下羟基自由基·OH的作用及其与不同影响因素(UV波长、pH和O3流量)和降解效率的影响关系。结果表明,2种氧化体系对PAHs的降解...利用光催化O3氧化技术降解油田采出水中2种典型多环芳烃(PAHs)萘和芴,考察了UV-O3和UV-TiO2-O32种氧化体系下羟基自由基·OH的作用及其与不同影响因素(UV波长、pH和O3流量)和降解效率的影响关系。结果表明,2种氧化体系对PAHs的降解率都达到了90%以上,但UV-TiO2-O3的处理效果更好,萘和芴的降解率分别达到了98.35%和100%。UV-O3体系下O3的优化条件是UVC、O3的体积流量30 m L/min,UV-TiO2-O3的优化组合是UVC、pH为8.5,O3的体积流量30 mL/min。展开更多
采用O3、UV/O3高级氧化法对水中六氯苯(HCB)的降解效果及机理进行了研究,并对结果进行了比较,结果表明,UV本身对HCB的去除率贡献不大,HCB可被O3、UV/O3快速降解,即UV<O3<UV/O3;O3、UV/O3作用时,提高体系的初始pH值不利于HCB的降解...采用O3、UV/O3高级氧化法对水中六氯苯(HCB)的降解效果及机理进行了研究,并对结果进行了比较,结果表明,UV本身对HCB的去除率贡献不大,HCB可被O3、UV/O3快速降解,即UV<O3<UV/O3;O3、UV/O3作用时,提高体系的初始pH值不利于HCB的降解,在pH=3,HCB=0.2 mg/L,反应40 m in时,HCB的去除可达50%左右,酸性条件下有利于降解反应的进行;无论是O3单独作用还是UV/O3联合作用,HCB的降解基本上满足准一级反应动力学规律,如果体系的pH值基本保持恒定,这种规律就更为明显。根据离子色谱(IC)、GC对六氯苯降解中间产物进行了测定,探讨了O3、UV/O3降解六氯苯的途径和机理。展开更多
文摘The performance of UV/H 2O 2, UV/O 3 and UV/H 2O 2/O 3 oxidation systems for treating spent caustic from an ethylene plant was investigated. In UV/H 2O 2 system, with the increase of H 2O 2 dosage, removal efficiencies of COD and the ratio of biochemical oxygen demand(BOD) to chemical oxygen demand(COD) of the effluent were increased and a better performance was obtained than the H 2O 2 system alone. In UV/H 2O 2 system, removal efficiency of COD reach 68% under the optimum condition, and BOD/COD ratio was significantly increased from 0 22 to 0 52. In UV/O 3 system, with the increase of O 3 dosage, removal efficiency of COD and BOD/COD ratio were increased, and a better performance was obtained than the O 3 system alone. Under the optimum condition, removal efficiency of COD was 54%, and BOD/COD ratio was significantly increased from 0 22 to 0 48. In UV/H 2O 2/O 3 system, COD removal efficiency was found to be 22.0% higher than UV/O 3 system.
文摘利用光催化O3氧化技术降解油田采出水中2种典型多环芳烃(PAHs)萘和芴,考察了UV-O3和UV-TiO2-O32种氧化体系下羟基自由基·OH的作用及其与不同影响因素(UV波长、pH和O3流量)和降解效率的影响关系。结果表明,2种氧化体系对PAHs的降解率都达到了90%以上,但UV-TiO2-O3的处理效果更好,萘和芴的降解率分别达到了98.35%和100%。UV-O3体系下O3的优化条件是UVC、O3的体积流量30 m L/min,UV-TiO2-O3的优化组合是UVC、pH为8.5,O3的体积流量30 mL/min。
文摘采用O3、UV/O3高级氧化法对水中六氯苯(HCB)的降解效果及机理进行了研究,并对结果进行了比较,结果表明,UV本身对HCB的去除率贡献不大,HCB可被O3、UV/O3快速降解,即UV<O3<UV/O3;O3、UV/O3作用时,提高体系的初始pH值不利于HCB的降解,在pH=3,HCB=0.2 mg/L,反应40 m in时,HCB的去除可达50%左右,酸性条件下有利于降解反应的进行;无论是O3单独作用还是UV/O3联合作用,HCB的降解基本上满足准一级反应动力学规律,如果体系的pH值基本保持恒定,这种规律就更为明显。根据离子色谱(IC)、GC对六氯苯降解中间产物进行了测定,探讨了O3、UV/O3降解六氯苯的途径和机理。
