摘要
采用AS和BS技术来修复饱和土壤和地下水中的甲基叔丁基醚(MTBE),讨论了在不同污染物初始浓度和不同微生物接种量情况下生物曝气效果及生物贡献率。结果表明,在MTBE初始浓度为50和100mg·L-1时,BS过程中的生物降解率分别为23.21%和12.97%,降解量分别为25.74和28.75mg,污染物的初始浓度对生物降解量的影响不大。在MTBE初始浓度为50mg·L-1时,AS和BS去除MTBE的时间分别为1800和1200min。在MTBE初始浓度为100mg·L-1时,AS和BS去除MTBE的时间分别为1800和1500min,对于高污染物浓度,挥发是主要的去除机理。
A soil column set-up was built up to study the airsparging （AS） and biosparging （BS） processes for the removal of MTBE in saturated soil and groundwater. The contributions of the biodegradation in BS process to the remediation of soil and groundwater were studied under conditions of different initial MTBE concentrations. The biodegraded MTBE accounted for 23.21% and 12.97% in the removed MTBE in BS respectively when the initial concentration of MTBE was 50 mg·L^-1 and 100 mg·L^-1. The amounts of degraded MTBE were calculated by mass conservation method and integration method of CO2 produced in BS. It was found that the results were almost the same for the two methods, which proved the reasonableness of the two methods. The amounts of degradation were 25.74 mg and 28.75 mg at 50 mg·L^-1 and 100 mg·L^-1 of initial MTBE concentrations respectively, and the initial contaminant concentration showed no significant effect on the amount of biodegradation. The efficiency of AS declined when the contaminant concentration was below 1.6 mg·L^-1. The volatilization was the dominant removal mechanism at higher contaminant concentrations, while, the biodegradation became the dominant during the last period of BS process, in which the contaminant concentration was lower, The time consumed in AS process under the condition of initial lower concentration was nearly equal to that under the condition of higher contaminant concentration and longer than that in BS. With inoculated microorganism, the time consumed in BS for higher initial contaminant concentration was longer than the lower initial concentration, being 1 500 min and 1 200 min respectively.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2006年第2期364-367,共4页
Journal of Agro-Environment Science
基金
国家自然科学基金资助项目(27276048)
关键词
生物曝气
MTBE
地下水
修复
biosparging （BS）
MTBE
groundwater
remediation
