Choosing the Best Design and Construction Technologies for Permeable Reactive Barriers - Permeable Reactive Barrier: Sustainable Groundwater Remediation - page 41

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Choosing the Best Design and Construction
Technologie s for Permeable Reactive Barriers
Dawit N. Bekele, Ravi Naidu, Volker Birke,
and Sreenivasulu Chadalavada
CONTENTS
3.1 Introduction .................................................................................................. 42
3.2 PRB Engineering Design Methodology.................................................... 43
3.2.1 Selection of Reactive Material ........................................................ 43
3.2.1.1 Geochemistry of GW ........................................................ 45
3.2.1.2 Reaction Kinetics ............................................................... 45
3.2.2 PRB Engineering Design ................................................................ 47
3.2.2.1 Hydrogeological Data for PRB Design ........................... 47
3.2.2.2 Sizing the Reactive Material Wall ................................... 48
3.2.3 Type and Configuration of Barrier ................................................ 49
3.2.3.1 Continuous PRBs ............................................................... 50
3.2.3.2 Funnel-and-Gate PRBs ..................................................... 50
3.2.3.3 Reactive Vessels ................................................................. 51
3.2.3.4 Caissons PRBs .................................................................... 51
3.2.4 Performance Monitoring................................................................. 52
3.3 PRB Construction Techniques ................................................................... 53
3.3.1 Excavation Techniques .................................................................... 54
3.3.1.1 Biopolymer Trenching ...................................................... 54
3.3.1.2 Continuous Trenching ...................................................... 54
3.3.1.3 Unsupported and Supported Excavation ...................... 55
3.3.1.4 Sheet Piling ........................................................................ 55
3.3.1.5 Slurry Wall ......................................................................... 56
3.3.2 Injection Techniques ........................................................................ 57
3.3.2.1 Hydraulic Fracturing ........................................................ 57
3.3.2.2 Jetting .................................................................................. 58
3.3.2.3 Soil Mixing ......................................................................... 58
3.4 Conclusion .................................................................................................... 59
References ............................................................................................................... 60
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