挥发酚污染场地地下水原位氧化修复半径确定的应用研究  

Determining the Radius of In-situ Oxidation for Groundwater Remediation in a Volatile Phenol-Contaminated Site

作　　者：蔡敏琦 李慧颖 杜喜臣[4] 冯宇 张丹[1,2] 李艳丹 夏天翔[1,2] CAI Minqi;LI Huiying;DU Xichen;FENG Yu;ZHANG Dan;LI Yandan;XIA Tianxiang(Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites,Beijing Municipal Research Institute of Eco-Environmental Protection,Beijing 100037,China;National Engineering Research Centre of Urban Environmental Pollution Control,Beijing 100037,China;Technical Center for Soil,Agriculture and Rural Ecology and Environment,Ministry of Ecology and Environment,Beijing 100012,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]北京市生态环境保护科学研究院,污染场地风险模拟与修复北京市重点实验室,北京100037 [2]国家城市环境污染控制工程技术研究中心,北京100037 [3]生态环境部土壤与农业农村生态环境监管技术中心,北京100012 [4]核工业北京地质研究院,北京100029

出　　处：《环境科学研究》2024年第11期2372-2381,共10页Research of Environmental Sciences

基　　金：北京自然科学基金资助项目(No.8232037)。

摘　　要：为探究确定更加合理的原位化学氧化(ISCO)地下水修复半径,本文以北方某地下水挥发酚污染场地为研究对象,设计和建立了一套由1口注射井和6口地下水观测井组成的现场原位化学氧化修复试验系统,估算单井氧化药剂注入影响半径。结果表明:(1)通过不同方向地下水水位变化速率、不同特征因子检测浓度变化趋势相互校准验证分析,氧化药剂扩散呈现各向异性的结果。(2)注射井向四周扩散的速率不相同,沿地下水流向下游方向扩散速度最快,其次是药物注射井和已有污染监测井连线方向,上游扩散速度最慢。(3)单次连续注射药剂量2 m^(3)条件下,地下水下游方向(OA)的影响半径约为3.0 m,地下水垂直方向(OB和OD)的影响半径出现不同的形态,其中OB方向与地下水上游方向(O)一致,约为0.8 m,但OD方向影响半径约为1.5 m。研究显示,本次现场试验验证了氧化药剂的修复效果,确定了单井氧化药剂注入影响半径及其几何形态的技术效果,提高了影响半径的判定精度,可为相关污染场地地下水原位氧化修复半径的确定提供参考。This study aims to determine a more reasonable radius for in-situ oxidation in groundwater remediation.Groundwater from a volatile phenol-contaminated site in a northern city in China was used as the research subject.A field test system consisting of one injection well and six groundwater observation wells was designed and established to estimate the influence radius and the geometric shape of single-well oxidizing agent injection.Our results indicated that the oxidizing agent solution did not diffuse uniformly after injection based on mutual calibration and verification analysis of the rate of change in groundwater levels in each direction and the variation trends of detection concentration of different characteristic factors.The diffusion rate of the chemical from the injection well to the surrounding areas varied,with the fastest rate occurring in the downstream direction along the groundwater flow,followed by diffusion in the direction of the connection and the upstream.Under continuous single-well injection conditions with a dose of 2 m^(3),the influence--→OA--→OB--→ODradius in the downstream direction of groundwater flow was 3.0 meters.The radius in the vertical direction(and)exhibited--→OB--→OCdifferent trends.The radius in the direction and the upstream direction of groundwater flow was consistent at about 0.8 m,while the radius in the--→OD direction was 1.5 m.These results confirmed the remediation effect of the oxidizing agent and determined the influence radius and its geometric shape of the single-well oxidation agent injection.Our study introduces a novel method for determining a more reasonable remediation radius and provide a theoretical reference for determining the in-situ oxidation repair radius of groundwater in similar contaminated sites.

关 键 词：地下水 挥发酚 原位化学氧化 修复半径 

分 类 号：X523[环境科学与工程—环境工程]