Xerox Corporation

The Permutit Company

International Hydronics Corporation

Albert B Mindler

Donald J Goodman

Ralph C Adams

Raymond E Kerollis

Arthur C Epstein

Bruce Bruns

William J Maroney

A method for removing selenium from waste water is disclosed comprising reducing selenium oxide with carbohydrazide in a solution comprised of the selenium oxide to form elemental selenium.

Selenium removal methods

Alkali metal hydroxide solutions containing substantial amounts of nitrate and nitrite which are contaminated by chromate are electrolytically converted to the corresponding hydroxides. The interference of the chromate with the normal electrolytic process is voided by adding bismuth ion to the solution and reversing the current direction at predetermined intervals.

Electrolytic reduction of nitrate from solutions of alkali metal

There is provided a composite strainer unit suitable for use with particulate substances in a liquid environment comprising a first strainer unit in combination with a second strainer unit. The first strainer unit having a much larger effective area than the second unit whereby, at any given speed the working liquid will pass through the first strainer unit at low velocity and through the second strainer unit at high velocity. The composite unit is provided with a valve means whereby flow access to the first strainer unit may be closed to permit high velocity flow through the second unit only.

High velocity composite strainer

Growing community of inventors

Princeton, NJ, United States of America

Albert B Mindler