Camp Dresser & Mckee Inc.

Cdm Smith Inc.

Patrick J Evans

Karl Hopfensperger

A method is provided for stimulating anaerobic degradation of a subsurface contaminant, comprising the steps of vaporizing liquefied petroleum gas (LPG) to form a treating gas and directing the treating gas to at least one subsurface injection site that includes the subsurface contaminant; wherein the treating gas stimulates anaerobic degradation of at least a portion of the subsurface contaminant.

Bioremediation process using liquefied petroleum gas

This invention includes methods of stimulating anaerobic degradation of subsurface contaminants. The methods include vaporizing a liquid electron donor to form a treating gas. The treating gas or hydrogen is directed to a subsurface site that includes one or more contaminants, thereby stimulating anaerobic degradation of the subsurface contaminants.

Process for in situ bioremediation of subsurface contaminants

The present invention provides apparatuses and processes for the measurement of hydrogen in aqueous solution at concentrations as low as about 0.1 nM. The present invention is capable of accurately and reproducibly measuring the concentration of dissolved hydrogen in an aqueous solution that also contains other dissolved gases, such as oxygen, carbon monoxide and sulfur compounds, such as hydrogen sulfide. In a presently preferred embodiment of a hydrogen analyzer,of the present invention, water containing dissolved hydrogen is equilibrated with a carrier gas by means of gas flow through a mass transfer device,. Carrier gas is equilibrated with hydrogen from the water within a gas equilibration volume,and is then circulated, by means of a pump,, through a circuit,that includes a moisture removal component,, an oxygen removal component,and a heated carbon monoxide and sulfur compound removal component,, which remove water, oxygen, carbon monoxide and sulfur compounds from the carrier gas without consuming or producing hydrogen. A sensor,measures the amount of hydrogen in the carrier gas from which moisture, oxygen, carbon monoxide and sulfur compounds have been removed.

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Seattle, WA, United States of America

Patrick J Evans