O3纳米气泡强化表面活性剂修复柴油污染土壤

实验将纳米气泡(直径50~270nm)与臭氧相结合,对比臭氧纳米气泡处理后对3种表面活性剂去除土壤中柴油污染物的增效作用,并探讨表面活性剂浓度、土质以及土壤老化时间等不同条件对污染物去除率的影响。对不同方式处理后的土壤样品进行XRD、FTIR表征,采用GC/MS对柴油组分的降解产物进行分析。结果表明,同等条件下3种表面活性剂随着浓度的增加,对柴油的洗脱效率也随之提高,洗脱能力依次为SDS＞SDBS＞TX-100。表面活性剂在搅拌实验30min内对污染物的去除效果增效明显,30~40min增速放缓。臭氧纳米气泡提高表面活性剂对砂土中柴油去除率明显高于壤土,其中砂土和壤土中柴油去除率提高约13%和9%。壤土中污染物的老化时间与去除率成反比,臭氧纳米气泡处理对较长老化时间的壤土中柴油去除率也有显著提高,对老化60天污染壤土提高近8%。FTIR光谱表明含有臭氧纳米气泡的表面活性剂可以减少对土壤中有机质主要官能团的影响。GC/MS图谱分析表明残留污染物组分主要为烷烃,降解难度:烷烃<烯烃<环烷烃<芳香族化合物。

Ozone nanobubble enhanced surfactant repair diesel contaminated soil

The experiment combined nanobubbles (diameter 50~270nm) with ozone, compared the improvement effect of ozone nanobubbles on the removal of diesel pollutants in soil by three surfactants. What is more, the influence of different treatments on pollutant removal rate, such as surfactant concentration, soil property and soil aging time, were also investigated. The soil samples treated in different ways were characterized by XRD and FTIR, as well as the degradation products of diesel components were analyzed by GC/MS. The results showed that under the same conditions, the elution efficiency of the three surfactants to diesel also increased with the increase of the concentration, and the elution capacity was SDS>SDBS>TX-100. The removal effect of the surfactant on the pollutants was significantly increased within 30minutes of the stirring experiment, and the growth rate slowed down between 30 and 40minutes. The removal rate of pollutants in sandy soil by ozone nanobubbles was significantly higher than that in loam soil, both the removal rate of diesel oil in sandy soil and loam soil increased by about 13% and 9%, respectively. The aging time of pollutants in the loam was inversely proportional to the removal rate but the ozone nanobubble treatment also significantly improved the diesel oil removal rate in the loam with a longer aging time, and increased by nearly 8% for the polluted loam aged for 60 days. The analysis of FTIR spectroscopy indicated that the surfactant containing ozone nanobubbles could reduce the effect on the main functional groups of organic matter in the soil. According to GC/MS spectrum showed that the residual pollutants were mainly alkanes, and the degradation difficulty order was alkanes