Enhanced reductive dechlorination (ERD) has rapidly become a remedy of choice for use on chlorinated solvent contamination when site conditions allow. With this approach, solutions of an organic substrate are injected into the affected aquifer to stimulate biological growth and the resultant production of reducing conditions in the target zone. Under the reducing conditions, hydrogen is produced and ultimately replaces chlorine atoms on the contaminant molecule causing sequential dechlorination. Under suitable conditions the process continues until the parent hydrocarbon precursor is produced, such as the complete dechlorination of trichloroethylene (TCE) to ethene. The process is optimized by use of a substrate that maximizes hydrogen production per unit cost. When natural biota are not present to promote the desired degradation, inoculates can be added with the substrate. The in-situ method both reduces cost and accelerates cleanup. Successful applications have been extended from the most common chlorinated compounds perchloroethylene (PCE) and TCE and related products of degradation, to perchlorate, and even explosives such as RDX and trinitrotoluene on which nitrates are attacked in lieu of chloride. In recent work, the process has been further improved through use of beverage industry wastewaters that are available at little or no cost. With material cost removed from the equation, applications can maximize the substrate loading without significantly increasing total cost. The extra substrate loading both accelerates reaction rates and extends the period of time over which reducing conditions are maintained. In some cases, the presence of other organic matter in addition to simple sugars provides for longer performance times of individual injections, thereby working in a fashion similar to emulsified vegetable oil. The paper discusses results of applications at three different sites contaminated with chlorinated ethylenes. The applications have included wastewaters of both natural fruit juices and corn syrup solutions from carbonated beverages. Cost implications include both the reduced cost of substrate and the cost avoidance of needing to pay for treatment of the wastewater.
Skip Nav Destination
The 11th International Conference on Environmental Remediation and Radioactive Waste Management
September 2–6, 2007
Bruges, Belgium
Conference Sponsors:
- Nuclear Division and Environmental Engineering Division
ISBN:
978-0-7918-4339-0
PROCEEDINGS PAPER
Green Remediation: Enhanced Reductive Dechlorination Using Recycled Rinsewater as Bioremediation Substrate Available to Purchase
Gaynor Dawson,
Gaynor Dawson
CALIBRE Systems Inc., W. Richland, WA
Search for other works by this author on:
Tom McKeon
Tom McKeon
CALIBRE Systems Inc., Bellevue, WA
Search for other works by this author on:
Gaynor Dawson
CALIBRE Systems Inc., W. Richland, WA
Tom McKeon
CALIBRE Systems Inc., Bellevue, WA
Paper No:
ICEM2007-7090, pp. 985-991; 7 pages
Published Online:
May 29, 2009
Citation
Dawson, G, & McKeon, T. "Green Remediation: Enhanced Reductive Dechlorination Using Recycled Rinsewater as Bioremediation Substrate." Proceedings of the The 11th International Conference on Environmental Remediation and Radioactive Waste Management. 11th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B. Bruges, Belgium. September 2–6, 2007. pp. 985-991. ASME. https://doi.org/10.1115/ICEM2007-7090
Download citation file:
11
Views
Related Proceedings Papers
Related Articles
Assessment of Bulk Oxygen Capacity and Transient Redox Behavior of Foamed Lanthanum Strontium Manganese Perovskites
J. Sol. Energy Eng (April,2024)
A Data-Driven Framework for Computationally Efficient Integration of Chemical Kinetics Using Neural Ordinary Differential Equations
ASME Open J. Engineering (January,2023)
Photocatalytic Treatment of Wastewater From 5–Fluorouracil Manufacturing
J. Sol. Energy Eng (February,1996)
Related Chapters
Dismantling
Decommissioning Handbook
Artificial Indents as the Root Cause of Rolling Contact Fatigue Damage: Effect of Plastic Properties
Bearing and Transmission Steels Technology
Evaluation of the Hydride Reorientation Behavior for Zircaloy-2 Liner Cladding with High Hydrogen Content during Interim Dry Storage Conditions
Zirconium in the Nuclear Industry: 20th International Symposium