摘要
监测式自然衰减（MNA）能够高效低耗地原位修复石油污染地下水的场地,微生物对污染物的降解对MNA过程起到了重要作用。在分析东北石油污染场地地下水中总石油烃（TPH）、电子受体的质量浓度分布和变化规律基础上,划分了微生物功能区。采用溶质通量计算法,对MNA原位修复的潜能及其微生物降解效果进行了评估。结果显示,场地微生物降解正在发生,利用的电子受体不同,划分为Mn、Fe和SO24-还原区。污染通量模型计算显示：上游地区微生物降解强度不断增强,下游地区微生物降解强度不断降低。监测期内石油烃总量降低了394 kg,微生物降解为自然衰减过程中的主要作用,其贡献率为64%~93%,每个通量断面内微生物降解率为0.18-0.73 kg/d。由此可以证明,MNA可以有效地修复地下水中的石油污染。
Monitored natural attenuation（MNA） can be used as a remediation technique with characteristics of high efficiency and low cost for contaminated site cleanup.The biodegradation of pollutants is an important function to natural attenuation processes.Based on the analysis of distribution and variations of total petroleum hydrocarbons（TPH） and electron acceptors at a petroleum contaminated site in NE China,the functional zones of microbial activities were determined.The remediation potential of in-situ MNA and the efficiency of biodegradation were estimated by using a mass flux approach.The results showed that biodegradation was taking place in groundwater at this petroleum contaminated site.According to the different electron acceptors,the biodegradation function can be divided into manganese reduction zone,iron reduction zone and sulfate reduction zone.The mass flux model results showed that the biodegradation function was increasing with time at upstream area,and was reducing at downstream area within the contaminant plume.During the monitoring period,394 kg of total petroleum hydrocarbons was attenuated.The most essential process of MNA is biodegradation,with contribution rate of about 64%-93% and the biodegradation flux rate was about 0.18 to 0.73 kg/d at each control profile.MNA can be introduced into petroleum-contaminated site as an effective solution to remove petroleum contamination.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2011年第3期831-839,共9页
Journal of Jilin University：Earth Science Edition
基金
国家'863'计划项目(2007AA06Z343)
关键词
微生物降解
监测式自然衰减
石油污染场地
原位修复
地下水
biodegradation
monitored natural attenuation
petroleum-contaminated site
in-site remediation
groundwater
