4.1 Introduction..................................................................................................63
4.2 Design of PRBs .............................................................................................65
4.2.1 Modeling of Induced Heterogeneity............................................. 66
4.2.2 Process-Based Modeling................................................................. 68
4.3 Numerical Models ....................................................................................... 70
4.4 Case
4.4.1
4.4.2
Study .................................................................................................... 70
Site Description ................................................................................ 72
Model Construction......................................................................... 72
4.4.3
4.4.4
Reactive Contaminant Transport .................................................. 73
Model Parameters ............................................................................ 75
4.4.5 Model Calibration ........................................................................... 75
4.5 Scenarios ....................................................................................................... 76
4.6 Outcomes ......................................................................................................77
4.6.1 Effectiveness of Passive Remediation .......................................... 79
4.7 Evaluation of the Simulations .................................................................... 79
4.8 Conclusion .................................................................................................... 81
References............................................................................................................... 82
4
Groundwater Modeling Involving PRBs:
General Aspects, Case Study
Sreenivasulu Chadalavada, Martin Wegner, and Ravi Naidu
CONTENTS
4.1 Introduction
Permeable reactive barrier (PRB) technology is an increasingly viable option
for remediating chlorinated hydrocarbon, petroleum hydrocarbon, and dissolved heavy metals contamination (Chapters 2 and 3). The PRB is an in
situ passive remediation technology and has certain advantages compared
to other active remediation technologies such as the pump-and-treat and
chemical oxidation. This technology also prevents the contamination from
migrating to uncontaminated aquifer systems. About 200 PRBs have been
installed worldwide (Das, 2002; ETI, 2005, see Chapter 3) for treating common contaminants like chlorinated hydrocarbons (Burris et al., 1995; Orth
63
4.2 Design of PRBs .............................................................................................65
4.2.1 Modeling of Induced Heterogeneity............................................. 66
4.2.2 Process-Based Modeling................................................................. 68
4.3 Numerical Models ....................................................................................... 70
4.4 Case
4.4.1
4.4.2
Study .................................................................................................... 70
Site Description ................................................................................ 72
Model Construction......................................................................... 72
4.4.3
4.4.4
Reactive Contaminant Transport .................................................. 73
Model Parameters ............................................................................ 75
4.4.5 Model Calibration ........................................................................... 75
4.5 Scenarios ....................................................................................................... 76
4.6 Outcomes ......................................................................................................77
4.6.1 Effectiveness of Passive Remediation .......................................... 79
4.7 Evaluation of the Simulations .................................................................... 79
4.8 Conclusion .................................................................................................... 81
References............................................................................................................... 82
4
Groundwater Modeling Involving PRBs:
General Aspects, Case Study
Sreenivasulu Chadalavada, Martin Wegner, and Ravi Naidu
CONTENTS
4.1 Introduction
Permeable reactive barrier (PRB) technology is an increasingly viable option
for remediating chlorinated hydrocarbon, petroleum hydrocarbon, and dissolved heavy metals contamination (Chapters 2 and 3). The PRB is an in
situ passive remediation technology and has certain advantages compared
to other active remediation technologies such as the pump-and-treat and
chemical oxidation. This technology also prevents the contamination from
migrating to uncontaminated aquifer systems. About 200 PRBs have been
installed worldwide (Das, 2002; ETI, 2005, see Chapter 3) for treating common contaminants like chlorinated hydrocarbons (Burris et al., 1995; Orth
63