摘要
采用自主研发的紫外光氧化除臭系统处理某污水处理厂曝气沉砂池产生的恶臭气体.系统考察了空塔停留时间、进口恶臭物质浓度、紫外辐射照度等因素对系统除臭效果和臭氧产生的影响,并对恶臭物质去除和臭氧产生过程分别进行了动力学分析.结果表明,在空塔停留时间1.5 s,平均紫外辐射照度1664μW.cm-2,H2S进口浓度为35 mg.m-3,NH3进口浓度为0.26 mg.m-3的条件下,H2S和NH3的去除率分别可达到为34.3%和53.8%.紫外光氧化反应器对H2S和NH3的去除速率随紫外辐射照度增大而线性增加,随进口浓度增加而增大且趋近于某极限值.反应器臭氧产生速率随进口恶臭物质浓度增加而线性减小,随紫外辐射照度增加而增大且趋近于某极限值.动力学分析和计算的结果表明,本研究建立的数学关系式可以较好地定量描述恶臭物质浓度以及紫外辐射照度对恶臭物质去除速率和臭氧产生速率的影响.
An UV photo-oxidation system was used to treat malodorous gas generated from the aerated grit channel in a sewage wastewater treatment plant. The effects of empty bed residence time （ EBRT）, influent odorants concentration and UV irridiation intensity on removal performance and ozone production in the system were investigated. The kinetics of odorant removal and ozone production were also analyzed. The experimental results show that the average removal efficiencies of H2 S and NH3 were 34. 3% and 53. 8% when the respective primary concentration was 35 mg. m-3 and 0.26 mg＂ m-3 under the condition of EBRT = 1.5 s, average ultraviolet radiation intensity UV = 1664 i^W.cm-2. The removal rates of H2 S and NH3 by the UV- photo-oxidation system increased linearly with UV intensity and finally maintained at the highest value. The ozone production rate in the system mainly decreased linearly with influent odorant concentration and increased with UV intensity up to a certain value. Moreover, the kinetic analysis demonstrates that the mathematical expressions built in this research can quantitatively describe the effects of influent odorant concentration and UV irradiance on odor removal and ozone production rates.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第1期7-14,共8页
Environmental Chemistry
基金
"十二五"国家水专项课题(2011ZX07301-003)资助
关键词
紫外光氧化
污水处理厂
恶臭物质
臭氧
动力学分析
UV oxidation, sewage treatment plant, malodorous substance, ozone, dynamic analyses.
