Combined Remedies: Success by Design or Default?
Monday, May 5, 2014: 1:20 p.m.
Platte River Room (Westin Denver Downtown)
Daniel Cassidy
,
Western Michigan University, Kalamazoo, MI
Vipul Srivastava
,
CH2M HILL, Chicago, IL
Implementing a single technology often supports one or more unintended remedial process by default, which contribute to site cleanup. In some cases two or more processes occur simultaneously, or nearly so, but in others a transition period of weeks to months may be required for the follow-on remediation process(es) to ensue. Understanding the transition and relative contribution of each remediation process allows for all the contributing technologies to be incorporated into the remedial design. Data from numerous bench-scale treatability studies on combined remedies contaminated soil, groundwater, and sediments will be presented. Examples of combined remedies include in situ chemical oxidation (ISCO) with bioremediation, ISCO with in situ stabilization/solidification (ISS), and a combination of ISCO, ISS and bioremediation. Many commonly used ISS amendments can aid in chemical oxidation. Both aerobic and anaerobic bacteria can be exploited for biological polishing of organics. Sulfate-reducing bacteria can promote the precipitation metal sulfides.
Daniel Cassidy, Western Michigan University, Kalamazoo, MI
Daniel Cassidy received a BS in Geology from the University of Wisconsin, a MS in Hydrogeology from Indiana University, and a Ph.D. in Environmental Engineering from the University of Notre Dame. He is a Professional Engineer in Michigan and the provinces of Ontario and Quebec. He has held university positions at Laval University in Quebec, Canada and Western Michigan University, where he is currently an Associate Professor.
His research includes aerobic and anaerobic bioremediation, chemical oxidation, chemical reduction, and stabilization/solidification. For over 10 years he has researched combinations of these individual remedies in laboratory treatability studies and in field applications.
Vipul Srivastava, CH2M HILL, Chicago, IL
Vipul J Srivastava is the Principal Technologist, and Practice Leader of Site Remediation and Revitalization at CH2M HILL. He has nearly 35 years of experience in the field environmental and remediation engineering, especially in the characterization and remediation of MGP and DNAPL sites. He is highly field experienced in several in-situ remediation technologies for contaminated soil and groundwater such as in-situ chemical oxidation (ISCO), in-situ stabilization/ solidification (ISS), in-situ thermal treatment (ISTT), integrated chemical-biological treatment (CBT), combined thermo-chemical stabilization (TCS), and enhanced bioremediation- both aerobic and anaerobic.
Srivastava has 10 Patents and numerous publications and presentations.
