DESIGNING IN SITU ANAEROBIC BIOREMEDIATION AS PRIMARY REMEDIATION FOR A MANUFACTURING FACILITY
Sami A. Fam, Ph.D., P.E. L.S.P., Boris Dynkin, P.E., (Innovative Engineering Solutions, Inc., Norwood, MA),
Frank Manale, Russ Copeland, P.E., Brad Droy, Ph.D., (Toxicological & Environmental Associates Inc., Baton Rouge, Louisiana )
Sam Fogel, Ph.D., Margaret Findlay, Ph.D., (Bioremediation Consulting, Inc., Watertown, MA),
Catherine Creber (The Dow Chemical Company, Sarnia, Ontario Canada); and
Gary Klecka, Ph.D. (The Dow Chemical Company, Midland, Michigan)
A large-scale anaerobic dechlorination system was designed, installed, and is currently operational at an active 993-acre chemical manufacturing plant in California to remediate chlorinated VOCs in groundwater. Several alternative methods for delivering amendments were considered. Numerous site-specific constraints had to be accommodated. Initially a system consisting of approximately 32 recirculation wells was chosen for delivering liquid amendments in order to establish a bioremediation reactive zone. Each recirculation well consisted of an upper and lower screened interval. Specific design issues such as equipment selection and configuration, pumps sizing, circulation flow control, flow and pressure measurements, etc. are discussed.
Based on actual operational experience, the original system was modified one year later to improve performance and to alleviate certain operational difficulties. The modified system consists of 39 alternating circulation wells: half of the wells pump groundwater from the lower formation to the upper formation and the other half has the reversed flow pattern. Design of the reversed flow circulation wells presented certain design challenges that were overcome with specially designed down-hole equipment. The modified system is currently operational.
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