Rethinking Reverse Osmosis

July 13, 2014 by dstadtler

By Greg S. Reyneke, CWS-VI At WQA Aquatech 2014, two good friends of mine received well-deserved awards for their long-time and selfless service to the…

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A Brief History of Ion Exchange Water Treatment

February 21, 2014 by dstadtler

By Gary Battenberg In 1850, agriculturalist Harry Stephen Meysey Thompson and chemist John Thomas Way observed that when a solution of ammonium sulfate was passed…

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A Primer on RO Application: Wastewater Concentration Calculations

January 18, 2014 by dstadtler

by Tanya Lubner, PhD Reverse osmosis technology finds numerous applications at the point of use as a final-barrier treatment for a series of anionic contaminants…

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Sustainable Decentralized Water Treatment for Rural and Developing Communities Using Locally Generated Biochar Adsorbents

October 24, 2012 by dstadtler

By Josh Kearns, MS Synthetic chemical water contaminants: an often overlooked challenge in international sustainable community development [caption id="attachment_639" align="alignright" width="300"] Figure 1. Scanning electron…

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Water Softener Performance Testing

March 8, 2012 by dstadtler

by Mark T. Unger The first performance standard for water softeners was the Water Conditioning Foundation’s (WCF) S-100 Standard. The first version was issued in…

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Reduction of Chloramines in Drinking Water Using Catalytic Carbon

February 24, 2012 by dstadtler

By Vivekanand Gaur, Ph.D. Introduction Instead of using chlorine, drinking water utilities are gradually switching over to the use of chloramines—in particular, monochloramine—for disinfection of…

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Low-Energy (LE) RO Membranes

January 18, 2012 by dstadtler

by By Michael Kim, CWS-I Background In the early 1980s, RO membranes had a typical salt rejection of 96 percent at 225 psi operating pressure.…

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Reverse Osmosis Technology – Not Just for Water Purification

January 17, 2012 by dstadtler

By Peter S. Cartwright, P.E. The membrane technology of reverse osmosis has been around for many years now and is finding more and more applications…

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Activated Carbon: Modern Advances for an Ancient Technology

June 24, 2011 by dstadtler

Since 1500 BC, when ancient Egyptians and Hindus first filtered water and medicines with activated carbon (AC), it has been used as a filter to…

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Ion Exchange Reactions: A Review

April 21, 2011 by dstadtler

By C.F. ‘Chubb’ Michaud, CWS-VI Ion exchange is versatile [caption id="attachment_1845" align="alignleft" width="212"] Fig 1. The water analysis[/caption] When you think about water treatment processes…

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