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水介质中微气泡臭氧化处理高浓度甲苯气体
High-concentration toluene gas treatment by microbubble ozonation in water medium
投稿时间:2018-08-28  修订日期:2018-11-03
DOI:
中文关键词:  微气泡  臭氧化  甲苯气体  吸收-氧化  水介质
英文关键词:microbubble  ozonation  toluene gas  absorption-oxidation  water medium
基金项目:河北科技大学科学治霾及大气污染防治重点攻关预研专项课题
作者单位E-mail
刘春 河北科技大学环境科学与工程学院 liuchun@hebust.edu.cn 
庞晓克 河北科技大学环境科学与工程学院  
高立涛 河北科技大学环境科学与工程学院  
张静 河北科技大学环境科学与工程学院  
陈晓轩 河北科技大学环境科学与工程学院  
张磊 河北科技大学环境科学与工程学院  
张瑞娜 河北科技大学环境科学与工程学院  
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中文摘要:
      高浓度VOC气体高效处理技术是大气污染控制领域关注的重点。采用微气泡臭氧化在水介质中通过吸收-氧化过程对模拟高浓度甲苯气体进行处理,考察微气泡臭氧化强化甲苯吸收-氧化去除性能、机理以及水介质pH值的影响。结果表明,微气泡能够强化甲苯气体在水介质中的吸收过程,氮气/甲苯微气泡在水介质中的甲苯去除率和吸收量均显著高于氮气/甲苯传统气泡,同时氮气/甲苯微气泡通过产生?OH氧化反应,使得平均甲苯氧化矿化率达到40.97%。微气泡臭氧化在水介质中对甲苯气体具有更高效去除性能,臭氧/甲苯微气泡处理中甲苯平均去除率为97.08%,甲苯可被完全矿化而几乎中间产物积累,其平均氧化矿化率为88.56%,平均臭氧利用率为82.54%,臭氧投加量与甲苯矿化量比值为1.26 mg?mg-1,处理性能显著优于臭氧/甲苯传统气泡处理。水介质pH值对臭氧/甲苯微气泡处理甲苯气体具有一定影响,不同pH值条件下甲苯气体去除率基本相当,但中性条件下甲苯氧化矿化率最高,碱性和酸性条件下甲苯氧化矿化率有所下降。微气泡臭氧化为高浓度VOC气体高效处理提供了新的解决途径。
英文摘要:
      The effective technology for high concentration volatile organic compound (VOC) gas treatment is a focus of air pollution control. The high concentration toluene gas was treated by microbubble ozonation with water medium through absorption-oxidation process. The performance and mechanism of enhanced absorption-oxidation removal of toluene in microbubble ozonation were investigated, and the effect of water medium pH was evaluated. The results showed that microbubbles could enhance absorption process of toluene gas in water medium. The removal efficiency and absorption amount of toluene in water medium using nitrogen/toluene microbubbles were much higher than those using nitrogen/toluene conventional bubbles. In addition, ?OH oxidation occurred when using nitrogen/ toluene microbubbles, which resulted in an average toluene oxidation mineralization efficiency of 40.97%. The more efficient removal performance of toluene gas was achieved in microbubble ozonation with water medium. In this case using ozone/toluene microbubbles, the average toluene removal efficiency was 97.08%. The toluene could be mineralized completely without Intermediate product accumulation. The average toluene oxidation mineralization efficiency was 88.56% and the average ozone utilization efficiency was 82.54%. The ratio of ozone dosage to mineralization removal of toluene was 1.26 mg?mg-1. The removal performance of toluene gas using ozone/toluene microbubbles was much better than that using ozone/toluene conventional bubbles. The water medium pH affected toluene gas treatment in microbubble ozonation to some extent. The toluene removal efficiency was almost same at different water medium pH. However, the toluene oxidation mineralization efficiency was maximum under neutral condition, and decreased a little under alkaline and acid conditions. Microbubble ozonation provides a new solution for efficient treatment of high concentration VOC gas.
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