Liquid purification or separation – Processes – Treatment by living organism
Patent
1998-09-21
2000-11-07
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210747, 210908, 210912, 210913, 210903, 4352625, C02F 328
Patent
active
06143177&
ABSTRACT:
An in situ method and system for reductive dechlorination, the precipitation of chromium, the precipitation of heavy metals, and microbial denitrification. The invention comprises the formation of in situ anaerobic reactive zones to precipitate and filter out dissolved heavy metals as metallic sulfides, to degrade nitrate to nitrogen gas, to reduce chlorinated hydrocarbons to ethene, and to precipitate and filter out chromium. The invention is comprised of an injection well or wells that extend into a contaminated saturated zone. A conduit located within the injection well conveys carbohydrates and sulfates to the contaminated saturated zone. Microbes digest the carbohydrates to produce sulfate reducing and methanogenic conditions within the reactive zone that include a dissolved oxygen level less than about 0.5 mg/l, a redox potential less than about -250 mv, and a dissolved organic carbon to contaminant ratio of greater than about 50:1. These biogeochemical conditions lead to the reduction of PCE to TCE to DCE to VC and eventually to ethene. These biogeochemical conditions also lead to the precipitation of heavy metals, the precipitation of chromium, and microbial denitrification.
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ARCADIS Geraghty & Miller, Inc.
Upton Christopher
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