CAJ | 학술논문

原位空气扰动技术(air sparging,AS)是去除饱和土壤和地下水中挥发性有机物的最有效方法之一.首先利用二维砂槽研究曝气量与空气饱和度、影响半径的关系.结果表明:提高曝气量可以增大地下水中的空气饱和度以及曝气影响半径,但二者的增幅与曝气量的增幅不成比例,随着曝气量的增加,二者增幅减缓.又利用砂槽研究了在水力梯度一定的情况下,不同曝气量对氯苯迁移和去除效果的影响.空气的注入降低了影响区域的渗透系数,减缓了地下水的流动,有效地控制了污染物的迁移.未曝气时,130 h以后,氯苯随地下水流迁移出砂箱的比例为19.7%,而曝气量为0.1、0.2 m~3/h时,此比例仅为3.6%和0.9%;与此同时,AS对氯苯的去除率分别为68.2%和78.6%.这说明AS可以有效控制污染物的迁移和去除,曝气量较大时效果更为明显.
원위공기우동기술(air sparging,AS)시거제포화토양화지하수중휘발성유궤물적최유효방법지일.수선이용이유사조연구폭기량여공기포화도、영향반경적관계.결과표명:제고폭기량가이증대지하수중적공기포화도이급폭기영향반경,단이자적증폭여폭기량적증폭불성비례,수착폭기량적증가,이자증폭감완.우이용사조연구료재수력제도일정적정황하,불동폭기량대록분천이화거제효과적영향.공기적주입강저료영향구역적삼투계수,감완료지하수적류동,유효지공제료오염물적천이.미폭기시,130 h이후,록분수지하수류천이출사상적비례위19.7%,이폭기량위0.1、0.2 m~3/h시,차비례부위3.6%화0.9%;여차동시,AS대록분적거제솔분별위68.2%화78.6%.저설명AS가이유효공제오염물적천이화거제,폭기량교대시효과경위명현.
Air sparging (AS) has been proven to be one of the most effective means of removing volatile organic compounds in saturated soils and groundwater. Firstly, the effect of air flow rates on air saturation and radius of influence (ROI) was investigated using a two-dimensional laboratory sand tank. The results show that improving air flow rate can increase higher air saturation and wider ROI. However, the increases of air flow rate and air saturation, ROI are disproportionate. With the increase of air flow rate, the increase amplitude of air saturation, ROI becomes slow. Then the effect of different air flow rates on chlorobenzene migration and removal in sand tank with a certain hydraulic gradient was also studied. The air injection into groundwater can reduce the hydraulic conductivity within the zone of influence, can slow down groundwater flow and contaminant migration. When no air flow injected, the proportion of chlorobenzene migrated out of the sand profile with the effluent groundwater is 19.7% after 130 hours. While the proportions were only 3.6% and 0.9% at air injection rates of 0.1, 0.2 m~3/h respectively. Meanwhile, 68.2% and 78.6% of the initial chlorobenzene mass has been removed at the two air injection rates respectively. This result reveals that AS can effectively control and remove contaminant migration in groundwater. This effect will be more obvious when higher air flow rate is used.