生物通风修复多种有机污染物体系的模拟分析

针对多污染物体系的生物通风修复过程，对生物通风（bioventing, BV）操作中的空气注入方式，单井修复还是多井修复及生物降解作用用BIOVENT软件进行了模拟，系统研究了各种操作条件对修复效果的影响。模拟研究结果表明：BV修复现场采用间歇注入的操作方式，其处理效果与连续注入方式相似，且可减小操作费用；在受污染区域小的现场采用单井修复较为合适，而当受污染区域远大于单井影响半径时，应采用多井修复才能够达到较好修复效果；BV修复前期宜使用较大空气速率来加快挥发性有机污染物的挥发速率，后期则宜采用较小空气速率以充分利用微生物降解作用去除土壤中残留污染物。

Simulation of remediation of multiple organic contaminants system by bioventing

Two air injection styles (periodic injection and continuous injection),single well or multiple wells,and biodegradation were simulated during bioventing (BV) process for multiple contaminants system.The effect of operating conditions on remediation efficiency was investigated.The results showed that similar removal efficiencies were obtained by using periodic air injection and continuous air injection.However,operating cost was reduced when periodic injection was chosen.In the case of small contamination zone,single well was enough to remove contaminants.When the contamination zone was larger than the effective radius of a single well,multiple wells should be used.In the earlier stage of the remediation process,a larger air flow rate was recommended to remove volatile organic contaminants.In the later stage of the remediation process,a smaller air flow rate was suitable for stimulating biodegradation in order to remove residual organic contaminants in soil.