摘要
通过实验定量研究了柴油污染包气带砂层自然衰减过程中吸附、生物和挥发作用。经吸附实验,确定了细砂对柴油饱和污水的吸附平衡时间为24 h,对总石油烃(TPH)的理论最大吸附量为234 mg/kg。同时,确定了ρ(HgCl2)=1 000 mg/L为抑制生物作用最有效的投加浓度。通过3个砂柱的对比实验,建立了柴油污染包气带砂层中生物作用和挥发作用的一级衰减动力学方程和半衰期。根据实验可知,包气带砂层从未受柴油污染到污染一段时间后的自然衰减过程中,吸附、生物和挥发作用均占有重要比例,是非常主要的衰减作用。
A series of experiments were conducted to study absorption,biodegradation and volatilization in natural attenuation of diesel pollution in sand layer of vadose zone quantitatively.According to the results of adsorption experiments,adsorption equilibrium time of diesel sewage by fine sand was 24 h,and theoretic absorption quantity to TPH was calculated to 234 mg/kg.At the same time,1000 mg/L of HgCl_2 was confirmed to be the most effective inhibitor of biological effect.By exploring the three columns as contrasts,the first-order attenuation kinetics equations of biodegradation and volatilization in the diesel polluted sand layer of vadose zone were established respectively as ρ（TPH）=25.48e-0.002 7x and ρ（TPH）= 25.48e-0.022 1x,and the half-life times were 256.67 d and 31.36 d.According to the experiments,the natural attenuation period from un-polluted condtion to polluted condition by diesel palyed a key role in natural attenuation,in which absorption,biodegradation and volatilization all occupied important proportions.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2010年第2期389-393,共5页
Journal of Jilin University：Earth Science Edition
基金
国家'863'计划项目(2007AA063Z343)
关键词
柴油
包气带
自然衰减
污染
diesel
vadose zone
natural attenuation
pollution
