March 2007
Volume 49 Number 3
 
Cover
Can You Beat the Curve?
by Andrew Warnes
Does the nationwide decline in new home construction have implications for the residential water treatment industry? Almost every residential water treatment dealer in the US has heard the tale that POE softener and filter sales tend to follow the trends of new home construction and sales.   read more
 
Color Removal by Ion Exchange
by C.F. 'Chubb' Michaud and Francis Boodoo
The presence of color in water can stem from several sources. Although often termed tannins (organics), color can have inorganic origins as well, such as iron or manganese. Simple field tests can confirm Fe++ or Mn++ and subsequent removal is rarely done by ion exchange.  read more
 
Impacts of Tariffs on Chinese Steam Activated Carbons (Part 1)
by Henry Nowicki, Wayne Schuliger and Barbara Sherman
As veteran activated carbon specialists with a wide variety of experiences, the authors provide personal opinions about the tariff on Chinese steam activated carbons entering into the United States.  read more
 
Design Considerations for Small Drinking Water Membrane Systems
by Anthony M. Wachinski and Charles Liu
Small communities of up to 10,000 people typically utilize up to one million gallons of potable water daily. Microfil-tration (MF) membrane technology provides a unique design solution for such communities.   read more
 
Today's RO (Part 2): Added Value for Small System Compliance
by Shannon P. Murphy
Last month we reviewed some of the lab and field test data recently gathered on RO membranes. These revealed that RO membranes have a very high ability to reduce and/or remove many vastly different contaminant materials from...  read more
 
Features
Physical Water Treatment Industry Closer to a Long-Awaited Certification
by Jeffrey M. Conway
Scale formation has long been a problem for those in the water industry, as well as in HVAC installations and many other commercial and industrial applications. Scale is a coating or precipitate deposited on surfaces that are in contact with...  read more
 
Fundamentals of Electrodeionization (EDI) Technology
by Chris Gallagher
Electrodeionization (EDI) has matured and grown in popularity since its first commercial introduction over 18 years ago. The technology can replace mixed ion exchange in many applications using a chemical-free process to produce...  read more
 
The Art of Countercurrent Regeneration
by Jerome Kovach
Ion exchange is a proven technology that has been commercialized for many decades. Applications for ion exchange include simple processes, such as softening, as well as the more complex systems, such as deionization for water recycling.  read more
 
Measuring the Effects of AOP as a Biocide on Pseudomonas Biofilms in a Model Jetted Tub System
by Ronald L. Barnes and D. Kevin Caskey
Results from a scientific study performed by a manufacturer at the University of Alabama in Huntsville indicate advanced oxidation processes (AOP) are very disruptive of bacterial biofilms that can be problematic in the plumbing of jetted tubs.   read more
 
Arsenic Treatment Solutions
by Jim Knoll
In the summer of 2006, a firm was selected to implement an arsenic, iron and manganese treatment solution for a residential development located in the rural outskirts of Boise, Idaho. Following the construction and sale of the first several...  read more
 
Pharmaceutical Grade Water from Start to Finish
by Michael Foster
The supply of USP (United States Pharmacopoeia) purified water (PW) can appear to be very complicated. In reality, it is simple chemistry and logical process engineering steps but with many detailed steps from start to finish. The definitive international standard-the USP guidelines-are both vague and clear.  read more
 
Web Exclusive
Columns
Wells and Water Treatment--Successfully Combining Two Industries in Minnesota
by Jim Gruenke read more
 
Water Tech--See, feel, and taste the difference
by As told to WC&P read more
 
Lead Reduction at pH 8.5
by Rick Andrew read more
 
Vulnerabilities of the Drinking Water Distribution System
by Kelly A. Reynolds, MSPH, Ph.D. read more
 
Analyzing the Lab: The Analysis of Chlorine Induced Disinfection Byproducts
by Stephen R. Tischler read more
 
Viewpoint: Part 2: Why you should attend WQA Aquatech USA in Orlando: Opportunities abound
by Peter J. Censky, WQA Executive Director read more