Filtration In Water and Wastewater Analysis   Water Quality Products December 2004   L.P. Raman
As simple as it looks, the filtration media and how it works is more complex that what meets the eye.
PDF Version

Greensand Process Removes Iron, Manganese, Arsenic from Groundwater   Water & Wastes Digest March 2003
Manganese greensand is a specially processed medium for iron, manganese, and hydrogen sulphide removal. This premium non-proprietary filter medium is processed from glauconitic greensand on which a shiny, hard finite thickness manganese oxide coating is formed and is firmly attached on every grain by a controlled process.

Municipalities Tap into Benefits of EDR Water Treatment   Water Engineering & Management February 2003
No one wants to drink radium, nitrates or arsenic. However, if not for some technologically advanced methods of removing these contaminants, we all might be sipping on some very unhealthy water.
PDF Version

ETV Testing Verifies Membrane Filtration Plant Treats Surface Water, Meets D/DBP Rule   Water Quality Products December 2002   PCI Membrane Systems, Inc.
A study published as part of the EPA's Environmental Technology Verification (ETV) Program verifies the performance of a Fyne Process membrane filtration plant tested on high organic-laden surface water in Barrow, Ark. The plant was able to remove significant levels of organics--precursors to disinfection byproducts such as trihalomethanes (THM) and haloacetic acids (HAA)--producing water that easily met the disinfection byproduct standards set by the EPA's stringent Stage 1 D/DBP Rule.
PDF Version

Stormwater Treatment: A Look at Various Methods, Hydrodynamic Separators   Water & Wastes Digest July 2002
Since the passing of the Clean Water Act, the industry has made great strides in improving the quality of point source discharges to the environment. As treatment technologies continue to improve, non-point source pollution becomes a more significant contributor to environmental degradation.

Small Site Dictates Stormwater Treatment Solution in Mich. Redevelopment   Water & Wastes Digest July 2002
Ann Arbor, a densely populated university town of 180,000, has been seeing an increase in urban redevelopment pressure in recent years as developable land has become scarce and land values have risen. The city of Ann Arbor has worked closely with the County Drain Commissioner’s office to use this redevelopment as an opportunity to improve the quality of stormwater flowing into the county drains.

Membranes: Fouling & Cleaning   Water Quality Products May 2002   Bjarne Nicolaisen
Membrane technology offers the possibility of managing total water resources. The spiral wound membrane element configuration is the most widely used due to its high packing density and relatively low price. This article will describe some technological advances in the area of innovative new membranes and application concepts for spiral wound membrane elements.
PDF Version

Using Advanced Adsorptive Media for Arsenic Treatment   Water Engineering & Management April 2002   Greg Gilles and Jennifer Mathis
On November 26, 2001, the new arsenic standard was signed into law—lowering the acceptable level for the contaminant from 50 parts per billion (ppb) to 10 ppb. Approximately 4,100 municipal water systems serving nearly 13 million people nationwide are affected by the law and are required to meet compliance by January 2006. According to the U.S. Environmental Protection Agency (EPA), 97 percent of these systems are small systems serving fewer than 10,000 people each. The economic impact on these small systems is likely to be large. However, there currently are options available to small municipalities that may be more affordable than central treatment.
PDF Version

RO Maintenance   Water Quality Products January 2002   Nevin Rudie
Understanding and reacting to the performance of a reverse osmosis (RO) system is necessary for continued successful operation. It is this interaction that allows us to quickly and correctly identify and correct issues that may arise.
PDF Version

Slowsand - Nanofiltration in Small Drinking Water Systems   Water Quality Products January 2002   C. Brent Cluff, Ph.D.
The patented combination of slowsand with nanofiltration offers benefits that merit considerable discussion. This combination successfully was piloted by the University of Arizona beginning in 1987.
PDF Version

Biofilm Elements Treat Colorado Town   Water Engineering & Management January 2002
PDF Version

Pure Water the Way It Was Meant to Be   Water Quality Products November 2001   By Michael Pennington, Severn Trent Services
As the public becomes more health conscious and educated about water contamination, demand for bottled water continues to increase. In order to provide purified water, it is important to understand the reverse osmosis (RO) water purification process.
PDF Version

Process Effectively Strips Hydrogen Sulfide Gas from Wastewater   Water Engineering & Management November 2001
PDF Version

Biofouling in Raw Water Supply Wells and Its Impact   Water Engineering & Management October 2001   Frederick Bloetscher, P.E., Gerhardt M. Witt, P.G. and Robert E. Fergan, P.E.
As membrane systems become more prominent in the treatment of well water supplies, more care must be taken to review the effects of microbiological contamination.
PDF Version

New Cartridge-type D.O. Sensor Saves Time, Money   Water & Wastes Digest April 2001   By Jim Klauer
To address the inherent measurement problems of electrode contamination, electrolyte depletion, and membrane coating, GLI International, Inc. has introduced a dissolved oxygen sensor featuring a replaceable membrane cartridge.
PDF Version

Nanofiltration Membranes   Water Quality Products January 2001   Harold Nicoll
Nanofiltration is a liquid separation membrane technology positioned between reverse osmosis (RO) and ultrafiltration.
PDF Version

Ultrafiltration   Water Quality Products December 2000   Mike Sadar
Ultrafiltration (UF) rapidly is becoming a common and practical method of preparing pure water that is free of particulate matter.
PDF Version

In-Home Systems: Utilizing RO and NF Elements   Water Quality Products October 2000   Jon Goodman
Innovations in membrane technology, which has been used in major industries and hospitals, are driving the industry into the home.

Membrane Filtration As an Alternative: Part 2   Water Engineering & Management August 2000   Dr. Mohamed Lahlou
Part one of this article appeared in the July issue and discussed microfiltration and utrafiltration. This article discusses nanofiltration and reverse osmosis.

Membrane Filtration as an Alternative: Part 1   Water Engineering & Management July 2000   Dr. Mohamed Lahlou
Once considered a viable technology only for desalination, membrane processes are increasingly employed for removal of bacteria and other microorganisms, particulate material and natural organic material that can impart color, tastes and odors to the water.

Green Technology:Tackling Industrial Effluent   Water Quality Products March 2000   D.J. Gordon
Osmonics, Inc. and Esmil Process Systems Ltd. developed a zero discharge effluent treatment and water recovery system for the niche timber market.

The Challenge of Membrane Maintenance   Water Quality Products February 2000   Peter Cartwright
The membrane processing technologies of microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) are widely used to separate suspended and dissolved materials from water solutions in numerous industrial, medical and drinking water applications.

CA Membranes: Under-the-Sink's Best Choice   Water Quality Products March 1999   Inge Bisconer
Cellulose acetate membranes serve as the under-the-sink choice for a host of reasons.
PDF Version

Manufacturing with Membranes   Water Quality Products March 1999   Steve Morris
An overview of various filtration methods and their applications.

Membrane Filtration for Water and Wastewater   Water Quality Products February 1999
Membrane filtration, widely used in chemical and biotechnology processes, is already established as a valuable means of filtering and cleaning wastewater and industrial process water.

Changing Reverse Osmosis Membranes   Water Quality Products October 1996   Dorothy Korszen, P.E.
Changing membranes in pressure vessels is easy with the proper tools