【作者】 胡顺之；

【导师】 张卫；

【作者基本信息】 华东理工大学 ， 环境科学与工程， 2011， 硕士

【摘要】 三氯乙烯是一种有毒氯代有机溶剂,会对环境造成污染并通过各种途径最终进入人体造成伤害。空气吹脱法是去除地下水中三氯乙烯污染的一种快速且有效的方式。本文采用室内模拟方法,系统研究了空气吹脱方法和加热方法对模拟地下水中三氯乙烯的去除效果和影响因素。空气吹脱法处理地下水中三氯乙烯的研究实验结果表明,曝气量对去除速率有一定的影响,最佳曝气流量为0.5L/min。500mg/L的三氯乙烯在曝气流量0.5L/min时,去除速率可达最大值0.045mg·L-1·min-1。并且,同一曝气流量条件下,模拟体系中三氯乙烯浓度越高,其去除速率越大。在介质中,使用脉冲曝气机制在曝气20min内可以达到90%以上的去除率,比连续曝气机制能达到更佳的去除效果。加热法处理地下水中三氯乙烯的研究实验结果表明,随着反应温度的升高,三氯乙烯去除速率和去除率均随之增加,在80℃反应210min后去除效果良好,去除率可接近100%。采用红外光谱仪分析三氯乙烯加热后的代谢产物,结果表明期间可能形成的物质有COCl2、CO2、HCl。将空气吹脱和加热两种方法结合,采用正交试验方法研究其主要影响因素。实验结果表明,曝气量影响最大,温度其次,浓度居末。并且,模拟实际污染场地试验中,曝气30min后各污染物残留浓度均可达到标准。更多还原

【Abstract】 Trichloroethylene is a kind of widespread polluted chlorinated organic solvent pollutants, it can through various channels enter human body to damage. Air Sparging method (AS method) is a rapid and effective remove method of trichloroethylene in the groundwater. This paper, through the laboratory simulation studied AS methods and heating method to eliminate trichloroethylene, for further study inside trichloroethylene pollution of groundwater management has certain directive significance.For Thermal Treatment of trichloroethylene conducted a preliminary study, with the rise of temperature, the concentration of trichloroethylene solution removal rate also increased. The higher the temperature, the faster trichloroethylene solution removal rate, and after 210min the better removal efficiency, finally the removal rate can nearly reach 100%. Different concentrations of trichloroethylene solution remove trends are very close, finally removal efficiency is also very close, the bigger concentration the bigger removal rate, but with the rise of temperature this trend become less obvious. And perliminary studied possible outcomes after Thermal Treatment of trichloroethylene by infrared spectrometer.Studies the removal efficiency and influencing factors of air sparging method removing trichloroethylene, the aeration flow has certain effect for removal rate, but not the bigger the better, on the same concentrations,0.5L/min has the largest removal rate of the four kinds of aeration flow, in 0.5L/min 500mg/L trichloroethylene the removal rate reached 0.045mg·L-1·min-1, very clearly proves the 0.5L/min aeration rate is the best aeration flow. The same aeration flow, the higher the concentration of trichloroethylene solution the bigger removal rate is. In a medium, pulse aeration mechanism is better than continuous aeration system.The orthogonal test method was used to study the progression of oxygen, temperature and concentration the three factors, and simulation field cases in a laboratory experiments, the results show that the air sparging method processing contaminated sites is an effective and feasible, remarkable time-consuming short method.更多还原