W. R. Grace Co.-Conn.

Adventus Intellectual Property Inc.

W.r. Grace & Co. of Canada Ltd.

Alan George Seech

James E Cairns

Igor J Marvan

Evica Dmitrovic

David Douglas Hill

Kerry W Bolanos-Shaw

Compositions in accordance with the principles of the present invention comprise a compressed mixture of fibrous organic materials and multi-valent metals used to remove organic chemical contaminants. The compositions are made into a pre-shaped, compressed form used to form a permeable reactive barrier for decontamination of soils, sediments, sludges, and waters containing environmental pollutants. The compressed mixture, comprising the fibrous organic particles and one or more multivalent metallic particles, is formed into reactive pellets, granules, and other pre-shaped structures for use in constructing a reactive barrier, typically for use in a contaminated environment or in an industrial process. By way of example, the pre-shaped structure may be used to construct a reactive barrier to remove halogenated organic chemical contaminants, nitroaromatic organic contaminants, or certain inorganic contaminants from various terrestrial and aquatic based ecosystems.

Composite material for a permeable reactive barrier

In accordance with the principles of the present invention, methods and apparatuses are provided for practically complete removal of one or more electron acceptors (excluding oxygen) from waters of various origins, while ensuring that an added excess of external carbon is also practically completely removed using biological treatment. A method applies to waters that contain the target electron acceptor and a deficiency of carbon. One application of this method is the practically complete removal of nitrate from domestic wastewater (septic wastewater) while practically completely removing the added excess of external carbon, thus practically eliminating any increase of the biological oxygen demand of the water. Another method applies to waters that contain constituents that are potentially convertible to the target electron acceptor and may contain original carbon. One example of this method is aerobic pre-treatment of a water to yield nitrate and a deficiency of carbon, resulting in a water amenable to treatment via the previous method.

Water treatment

A method of creating an environment which promotes dehalogenation and/or degradation of halogenated organic chemical contaminants in water, sediment, or soil by adding a combination of fibrous organic matter and certain multi-valent metal particles to the water, sediment or soil.

Composition and method for dehalogenation and degradation of halogenated

A method of creating an environment which promotes degradation of nitroaromatic organic chemical contaminants in water, sediment, or soil by adding a combination of fibrous organic matter and certain multi-valent metal particles to the water, sediment or soil.

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Mississauga, Canada

Alan George Seech