文档介绍：Groundwater remediation 地下水修复 Contents 1 2 3 Introduction Physical Remediation Chemical Remediation 4 Bioremediation bined remediation 6 Discussion and Summary 1. Introduction Reasons for Groundwater pollution ? Industrial waste water discharged ? Contaminated surface water invades underground aquifer ? polluted water in the polluted groundwater ? Phenol (酚) ? chromium (铬) ? mercury (汞) ? arsenic (砷) ? radioactive substances (放射性物质) ? bacteria anic matters Classification of groundwater remediation technology ? Physical method ? Chemical method ? Biological method ( Bioremediation ) ? Combined remediation technology Physical remediation (物理修复技术) Air Sparging (AS) (曝气修复技术) ic Remediation(ER) (电动修复技术) 12 Section header Section header Section header Section header Definition Air Sparging , AS (曝气修复技术) Air sparging (AS) is an innovative groundwater remediation technology which has been firstly used in Germany in the middle 1980s to remove pounds( VOCs). (挥发性有机物) Because of its properties of in-situ, efficiency and economy , AS has ing an important technology to anic pollution. AS system Definition Section header Section header Section header System 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 anic chemicals volatilize into the air and are removed from the groundwater. (挥发、迁移扩散、生物降解) Hydro geological characteristics of groundwater Aeration operating characteristics aeration patterns Components and nature of pollutants Section header Section header Advantages Section header Section header Advantages and influencing factors simple equipment easy to operate Short treatment time and high speed ( 1-3years ) Small investment