Membrane Filtration as an Alternative: Part 1

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.

About The Author: 

Dr. Mohamed Lahlou is the technical assistance specialist for the National Drinking Water Clearinghouse. This article originally appeared as a tech brief for the NDWC.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11775

Improving the Quality of Deionizers

Though both the cation and the anion resin are responsible for the quality of a deionization (DI) system effluent, it is the cation resin that is the big contributor to leakage. Improving the leakage characteristics of DI cation will reduce effluent conductivity, drop the pH and ultimately lead to better silica performance from the system.

About The Author: 

Jim Sabzali is the North American sales and marketing manager of The Purolite Co., Bala Cynwyd, Pa. Sabzali has 20 years of experience with synthetic resins and has been with Purolite since 1990. He can be reached at 800-343-1500; fax 610-668-3962; e-mail jsabzali@puroliteusa.com.

C.F. "Chubb" Michaud, CWS-VI, is technical director of the Systematix Co. of Placentia, Calif., which he founded in 1982. With more than 30 years of experience in water and fluid treatment, he is a member of the Water Quality Association's Ion Exchange Task Force and chairman of its subcommittee for component providers in the manufacturer/supplier section. Michaud can be reached at 714-993-2482; fax 714-528-2482; e-mail chubbh2o@aol.com.

Publication Date: 
December 28, 2000
Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11606

Desalination System Brings Water to Small Island Off Washington Coast

Off the coast of Washington, 32 families on Guemes Island were faced with an aging well that was drawing salt water into its system. Because groundwater is scarce on the island, residents had to rely on what little rain water soaks into the ground.

About The Author: 

Osmonics, Minnetonka, MN
Phone 800-605-6698, Fax 719-536-3301
www.osmonics.com

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11561

Desalination of Seawater and Brackish Water

The increasingly broad range of requirements for water quality has motivated the water treatment industry to refine existing techniques, combine methods and explore new water purification technologies including desalination.

About The Author: 

Wil Pergande is vice president of special projects for Osmonics, Inc., a manufacturer and worldwide marketer of high-technology water purification and fluid filtration, separation and handling equipment. He offers more than 30 years experience in management, sales and marketing in the water treatment industry. He may be reached at 612-933-2277.

Barry Abolmaali is the manager of applications engineering and customer service at Osmonics, Inc., Vista Operations. He has utilized his chemical engineering degree at Osmonics for eight years. He may be reached at 760-598-1800.

Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11516

Guidelines for Cation Resin Replacement

This article discusses strong acid cation resin typically used in water softeners or as the first unit in a two-bed cation-anion demineralizer.

Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11436

RO Desalinators & PLCs Provide Fresh Water to Remote Areas

Reverse osmosis plants increasingly are being installed in outlying and remote areas. By providing water they can sustain life and/or provide irrigation to previously remote areas without readily available fresh water sources.

About The Author: 

Gregory Nadsady is a mechanical engineer who has been with Sea Recovery Corporation for two years. He holds a Bachelor’s degree in Mechanical Engineering from Loyola Marymount University and is working on a Master of Science degree in Systems Engineering and Mechanical Design.

Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11365

Membrane Filtration for Water and Wastewater

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.

Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11283

Shoring Up Future Water Supplies with RO Sea Water Plants

As competition for limited water supplies increases, sea water treated by reverse osmosis will become more viable.

Deck: 

Reverse Osmosis

About The Author: 

Alan Smith is the general chairman of the International Water Conference. The 1998 International Water Conference will be held October 19-21, 1998 in Pittsburgh. For a complete program listing and registration information, please contact IWC Conference Manager Ruth Gregg at e-mail: conf@eswp.com; phone: 412-261-0710 ext. 11; or fax: 412-261-1606.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11203

Reverse Osmosis Used to Purify and De-nitrify Water in a Municipal Plant

Culligan International Company has been providing services to small municipalities since the 1970s, but in February of 1997 the company signed a $1.9 million contract with the city of Abilene, Kansas, to remove nitrates from the city's water system.


The overall cost of the project was estimated at $6 million. This marked the largest domestic municipal project for Culligan and led to the creation of a municipal markets division within the company.


Fertilizers used in this farming area raised nitrate levels in the water beyond those allowed by state law.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11079

Advanced Water Treatment Technologies May Bring Repurified Water to San Diego

"In four years, half of San Diego may be filling its glasses with tap water that once ran through its toilets."

About The Author: 

This article was written by Inge Bisconer of Osmonics Desal, Vista, California. Osmonics Desal is a leading manufacturer of spiral wound reverse osmosis, nanofiltration, ultrafiltration and microfiltration membranes for the residential, commercial, institutional and industrial marketplaces.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11044