反硝化增强去除乙醇对多孔介质渗透性的影响

反硝化增强去除乙醇对多孔介质渗透性的影响

蒋亚萍1，陈余道1，张燕2，黄月群1

1. 广西环境工程与保护评价重点实验室，桂林理工大学，桂林 541004；2. 南京大学地球科学与工程学院，南京 210093

收稿日期:2010-03-20 修回日期:2010-03-20 出版日期:2010-03-20 发布日期:2010-05-25

Effects of Ethanol Nitrate-Enhanced Bioremediation on Permeability of Porous Media

JIANG Ya-ping1，CHEN Yu-dao1，ZHANG Yan2，HUANG Yue-qun1

1. Guangxi Key Lab of Environmental Engineering, Protection and Assessment, Guilin University of Technology, Guilin 541004, China;2. School of Earth Science and Engineering, Nanjing University, Nanjing 210093, China

Received:2010-03-20 Revised:2010-03-20 Online:2010-03-20 Published:2010-05-25

摘要/Abstract

摘要： 随着乙醇混合汽油的不断推广应用，乙醇将成为地下水中与苯、甲苯、乙苯及二甲苯的同分异构体（BTEX）共存的一种新型污染物。通过4 个含水砂柱实验，研究了乙醇存在及其强化去除对含水介质渗透性能的影响。结果表明：在有限溶解氧与反硝化增强修复条件下，乙醇去除率达92% 以上；生物过程对介质渗透能力影响程度随乙醇初始浓度、消耗速率与补充频率而变化：乙醇初始浓度接近1 000 mg/L 和3 000 mg/L 时，乙醇消耗快，补充频率高，渗透系数下降总体上有连续性，最大下降幅度达一个数量级（×10-1 cm/s）；乙醇初始浓度达到5 000 mg/L 时，渗透性下降显著，可下降两个数量级，但乙酸的积累可影响生物活性，并使得渗透性变化出现反复；当不含乙醇时，汽油溶解组分对介质渗透性能的影响相对不明显。

Abstract: Increasing use of ethanol blended gasoline will make ethanol a new contaminant along with benzene，toluene，ethylbenzene and xylene isomers（ collectively denoted as BTEX） in groundwater. This study focuses on the effects of ethanol nitrate-enhanced bioremediation on permeability of porous media via four sand column experiments. Results showed that the removal rates of ethanol were greater than 92 % under limited dissolved oxygen and amended nitrate conditions. Effects of bioprocesses on permeability could vary with the initial concentration of ethanol, biodegradation rate and amendment frequency. For the initial concentration of ethanol near 1 000 mg/L or 3 000 mg/L，the permeability coefficient could continuously decrease one order of magnitude（ ×10-1 cm/s） comapred with the background value. The amendment frequency of ethanol was high because ethanol could be rapidly consumed within a short time. In the presence of the initial ethanol concentration up to 5000 mg/L，the permeability coefficient could decrease two order of magnitude. However, the slow consumption rate of ethanol and the low amendment frequency for ethanol would likely cause the permeability to be increasd. For comparison，dissolved hydrocarbons of gasoline without ethanol showed insignificant effect on permeability.

蒋亚萍，陈余道，张燕，黄月群. 反硝化增强去除乙醇对多孔介质渗透性的影响[J]. J4.

JIANG Ya-ping1，CHEN Yu-dao1，ZHANG Yan2，HUANG Yue-qun1. Effects of Ethanol Nitrate-Enhanced Bioremediation on Permeability of Porous Media[J]. J4.