Sandia Corporation

Ch2m Hill, Inc.

Joseph Daniel Chwirka

Patrick V Brady

James L Krumhansl

Brian P Dwyer

A low-cost, water treatment system and method for reducing arsenic contamination in small community water storage tanks. Arsenic is removed by using a submersible pump, sitting at the bottom of the tank, which continuously recirculates (at a low flow rate) arsenic-contaminated water through an attached and enclosed filter bed containing arsenic-sorbing media. The pump and treatment column can be either placed inside the tank (In-Tank) by manually-lowering through an access hole, or attached to the outside of the tank (Out-of-Tank), for easy replacement of the sorption media.

In-tank recirculating arsenic treatment system

A method of removing metal or metalloids, arsenic in particular, from groundwater or another source of contaminated water. The method comprises providing a water source, contacting the water source with CO , whereby the pH of the water source is lowered to produce pretreated water, contacting the pretreated water with a metal or metalloid complex-adsorbing substance whereby contaminants are separated from the remainder of the pretreated water to produce metal or metalloid-depleted water, and stripping the CO from the metal or metalloid-depleted water, whereby the pH of metal or metalloid-depleted water is increased. A system for metal removal utilizing the CO process is also provided.

Growing community of inventors

Tijeras, NM, United States of America

Joseph Daniel Chwirka