Betz Laboratories, Inc.

K Robert Lange

Donald F Jacques

The present disclosure is directed to methods and agents for detaching and dispersing microbiological deposits which occur on support materials in contact with aqueous systems. The method includes adding to the aqueous medium and thereby contacting the deposits with from about 1 to 100 parts per million of an agent which possesses hydrogen-bonding characteristics. Preferred agents include but are not limited to urea, ethanolamine, water-soluble acrylamide polymers, and water-soluble reaction products of amines, and epoxy or expoxy precursor compounds and mixtures thereof.

Removal of microbiological deposits

A method for reducing the residual chromate level in effluent waters comprising catalytic reduction of the chromate ion by hydrogen to the trivalent chromium state and removal of the chromium by passage through a cation exchange resin column or by base precipitation in a settling pond.

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Huntingdon Valley, PA, United States of America

K Robert Lange