Wound Around Membrane
Water Quality Products
November 2007
By McClean Anderson
Filament-wound fiberglass proves to be effective for membrane production
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Solar-Powered Water
Membrane Filtration
November 2007
By Andrew Warnes
Combining ultrafiltration membrane microbiological purification and solar panels for remote populations
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Acing the Test in Alaska
Water Quality Products
December 2006
Membrane filtration systems provide Alaskan schools with quality water
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Water Reuse: A Global Trend
Membrane Filtration
November 2006
Abhay Hanamsagar
Membrane filtration systems continue to play an important role in the growing reuse market
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Meeting Potable Water Demands
Membrane Filtration
November 2006
Dow Chemical Co.
Nanofiltration produces sparkling clean water for Swedish resort community
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Extending the Life of Your Membranes
Membrane Filtration
November 2006
David Osgood
Prefiltration provides complete turnkey operation with low membrane maintenance requirements at an ethanol plant
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Paradigm Shift in Filtration
Membrane Filtration
November 2006
Henry Frank, Leonid Kaledin & Fred Tepper
Advanced depth filtration offers an alternative to membranes
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Beyond POU
Membrane Filtration
November 2006
By Richard Crooks & Kelly O’Connell
Will America embrace whole-house ultrafiltration?
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Ultrafiltration Membranes
Water Quality Products
May 2006
By David Lazar
UF systems meet growing demand for pure water at pharmaceutical plant in Puerto Rico
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Ultrafiltration Membranes
Membrane Filtration
November 2005
David Lazar
UF systems meet growing demand for pure water
With an aging and often overwhelmed water supply infrastructure, ever more stringent government regulations, and growing industrial requirements for pure water, municipalities and companies are increasingly turning to ultrafiltration (UF) membrane systems for water and wastewater treatment.
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Desalination
Membrane Filtration
November 2005
By David Lazar
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Maximize Profits and Customer Satisfaction by Selecting the Correct Housing
Water Quality Products
January 2004
Marcia Rick, Pentair Water Treatment
The cartridge often is thought of as the heart of a filter system. However, the cartridge operates within a housing and even a cartridge that is perfectly matched to the application won’t perform adequately if it’s not also matched to a housing that meets the same application requirements. Specifying them together as an integrated system is the best way to assure they provide optimal performance.
PDF Version
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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.
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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
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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.
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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.
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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
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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
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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
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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
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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
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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
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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
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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
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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.
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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.
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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.
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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.
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Manufacturing with Membranes
Water Quality Products
March 1999
Steve Morris
An overview of various filtration methods and their applications.
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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.
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