In-situ transformation of carbon tetrachloride and other halogenated compounds resulting from biostimulation under anoxic conditions

Article Abstract:

The metabolization of halogenated aliphatic compounds under anoxic conditions created through biostimulation by indegenous organisms is discussed. A shallow aquifer containing nitrate and sulfate as potential electron acceptors was used as the test zone of the experiments. Tracer tests, biostimulation with acetate and nitrate and biotransformation with complete nitrate removal were performed on the test zone. It was found that the addition of acetate to the aquifer transformed carbon tetrachloride by its biostimulation of a natural bacterial population.

Analysis, Microbiological chemistry, Carbon tetrachloride

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Comment on "Long Term Sorption of Halogenated Organic Chemicals by Aquifer Material, part 1: Equilibrium." (Correspondence)

Article Abstract:

Two minor corrections and some additional discussions regarding the logarithm value of Kow on a previous paper on tetrachlorethene (PCE) and 1,2,4,5- tetrachlorobenzene sorption by aquifer solids are presented. A typographical error and the inappropriate usage of the word solubility comprise the minor corrections. A revised estimate for the Kow of the PCE was derived. Although it would not alter the findings of the study, this was done to remind other researchers the need for critical source checking.

Evaluation, Organic compounds, Chemical research

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Full-scale evaluation of in situ cometabolic degradation of trichloroethylene in groundwater through toluene injection

Article Abstract:

For a period of 312 days, the trichloroethylene (TCE) in groundwater injected with toluene demonstrated an average of 87 plus minus 8% TCE removal in the upper aquifer with each pass through the treatment well. A total TCE removal of 97-98% was observed when about 1000 microng/L of TCE was reduced in new water entering the 480 m2 monitored treatment zone to an average of 18-24 microng/L in groundwater leaving the treatment zone.

Research and Development in the Physical, Engineering, and Life Sciences, All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Petrochemical Manufacturing, Toluene, Water Pollution Control R&D, Trichloroethylene, Usage, Bioremediation, Water, Underground, Groundwater, Contamination, Water pollution research

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