Includes bibliographical references and index.

Introduction -- Chemical and biological processes : the need for mixing -- Transport and mixing -- Hydrogeochemical models -- Travel-time based reactive transport modeling for in situ subsurface reactor -- Recirculation systems -- Permeable barrier walls -- In situ sparging for delivery of gases in the subsurface -- Intrinsic remediation in natural-gradient systems -- Source remediation challenges -- Appendix A: List of acronyms and abbreviations -- Appendix B: Unit conversion table -- Appendix C: Glossary.