生物通风过程中单井轴对称受污染区域流场的数值模拟

引 言 土壤污染主要为有机物污染、重金属污染和放射性污染3大类,其中有机物污染最为严重.我国目前大部分油田区和加油站存在储油罐及输送管道泄露的情况,另外加上落地油、含油污水排放等原因,大量有机类污染物进入土层,对土壤甚至地下水造成严重污染1].

Fluid field simulation of axis symmetry contaminated zone with single vertical injection well during bio-venting process

A two-dimensional numerical model was presented for simulating the fluid flow during the bio-venting remediation process.The axis symmetry contaminated zone with a single vertical injection well was used for this simulation.The changes of fluid fields with time were obtained and the results from simulation showed that fluid field changed greatly in the first 30 min，and the change became smaller from 30 min to 60 min. After 60 min，nearly no change was obtained.The required time to develop the steady fluid fields was about 60 min with air injection rates of 81.504 m³·d^-1 and 407.52 m³·d^-1.The transport，mass transfer and biodegradation of contaminants could be simulated in follow-up studies based on the results of the flow modeling.