Research Situations
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Key technique research: Three approaches are employed in the existing models to predict the fates of VOCs in the gas and liquid phases during air sparging of groundwater in the saturate zone. (AS 多相流动过程中气液流动以及污染物传质过程的 模型研究是AS 技术的关键因素)
Small investment
Advantages
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Hydro geological characteristics of groundwater Aeration operating characteristics aeration patterns Components and nature of pollutants
1.Introduction
Classification of groundwater remediation technology
Physical method Chemical method Biological method（Bioremediation） Combined remediation technology
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• Being used to remove the heavy metals as Arsenic( 砷）、 cadmium （镉）、 • such ERis an environment-friendly and chromium （铬）、 mercury （汞）、lead highly efficient in-situ technique （铅）. that make use of electrokinesis to •The removal efficiency：80%～95%. remove the pollutants from the soil and groundwater .
1. Introduction
Reasons for Groundwater pollution Industrial waste water discharged Contaminated surface water invades underground aquifer polluted water
Groundwater remediation 地下水修复
Contents
1
Introduction
2
Physical Remediation 3 Chemical Remediation
4
Bioremediation
5
Combined remediation
6
Discussion and Summary
Models:
resear ch Lumped parameter models （集中参数模型） multiphase fluid flow models （分布式多相流流动模型）
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Electrokinetic Remediationon header
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AS system
Definition
System
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Two Processes: Aeration曝气 : Air is injected into the saturated zone below or near a contaminant plume. Mass transfer 传质 : As the air rise to the surface, dissolved and nonaquousphase organic chemicals volatilize into the air and are removed from the groundwater. （挥发、迁移扩散、生物降解）
1.Introduction
Components in the polluted groundwater
• • • • • • Phenol（酚） chromium（铬） mercury（汞） arsenic（砷） radioactive substances（放射性物质） bacteria and organic matters
Physical remediation
(物理修复技术)
Air Sparging (AS)(曝气修复技术） 1 2 Electrokinetic Remediation(ER)(电动修复技术）
Air Sparging，AS (曝气修复技术）
Definition
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Air sparging (AS) is an innovative groundwater remediation technology which has been firstly used in Germany in the middle 1980s to remove volatile organic compounds( VOCs). (挥发性有机物） Because of its properties of in-situ, efficiency and economy , AS has becoming an important technology to remediate organic pollution.
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Advantages and influencing factors
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simple equipment easy to operate
Short treatment time and high speed（1-3years）
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