Evoqua Water Technologies Pte. Ltd.

The Texas A&M University System

Siemens Water Technologies Holding Corp.

Michael W Wismer

Yongheng Huang

Simon Paul Dukes

Frank L Sassaman, Jr

David L Berger

Frank Sassaman

Xiangyi Qiao

Michael R Riffe

Lew Andrew Reyes

Karthikeyan Sathrugnan

Marek Mierzejewski

Samuel A Mason

Richard Woodling

James C Day

Systems and methods for removing heavy metals such as selenium from wastewater with zero valent iron media. Air may be introduced directly into a reaction zone of a fluidized bed reactor filled with the media to catalyze treatment.

Removal of selenocyanate from refinery sour water stripper wastewater

A system containing a reactor vessel including zero valent iron media, a source of a conditioning additive, a source of a reaction additive, and a process control subsystem is disclosed. A method for reducing a concentration of one or more contaminants in contaminated water including contacting zero valent iron media with a conditioning additive, contacting contaminated water with conditioned zero valent iron media, and introducing a reaction additive is also disclosed. The conditioning additive and reaction additive may each contain an aluminum salt.

Selenium removal using aluminum salt at conditioning and reaction stages to activate zero-valent iron (ZVI) in pironox process

A system to remove contaminants from contaminated water contains a pre-concentrating subsystem, a contaminant removal subsystem or a biological subsystem configured to remove two or more contaminants, and a permeate blending subsystem. A process for removing contaminants from contaminated water includes concentrating contaminated water, treating concentrated contaminated water, and combining product water to produce environmentally acceptable product water.

Concentration of wastewater to reduce flow rate, cost, and footprint of treatment system

Concentrating of wastewater to reduce flow rate, cost, and footprint of treatment system

The inventive process scheme and its various embodiments described herein will comprise filtering a selenium containing water by reverse osmosis or nanofiltration to produce a primary permeate stream at least meeting the water stream effluent discharge requirements of the location and a concentrate stream containing the removed selenium and other species, a RO or NF concentrate treatment specific to the case which will treat and reduce the selenium content of the concentrate, optionally in conjunction with a sulfate removal process, and result in a highly concentrated sludge or other output, and a selenium depleted aqueous overflow stream, a portion of which will be combined with the primary permeate stream so that the selenium content of the combined stream does not exceed the local requirement, and the reminder of the selenium depleted aqueous overflow stream will be returned to be combined with the selenium containing water entering the inlet of the primary reverse osmosis treatment.

Integrated selenium removal system for waste water

Wastewater streams from semiconductor processing operations are treated to reduce the concentration therein of one or more metal species to a satisfactory level. The disclosed systems and technique utilize complexing ion exchange media to treat the wastewater streams having a significant concentration of oxidizing species.

System and method of slurry treatment

Growing community of inventors

Lino Lakes, MN, United States of America

Michael W Wismer