Biofouling in Raw Water Supply Wells and Its Impact

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.

Deck: 

Membrane Concerns

About The Author: 

Frederick Bloetscher, P.E., is director of engineering, operations and planning for Public Utility Management and Planning Services, Inc. (PUMPS, Inc.), Dania Beach, Fla.

Gerhardt M. Witt, P.G., is the principal of Gerhardt M. Witt & Associates, Inc., West Palm Beach, Fla.

Robert E. Fergan, P.E., is an engineer with Hazen & Sawyer, Raleigh, N.C.

Activation Date: 
October 19, 2001
Legacy
Legacy ID: 
12706

The State of Regulations

As the POU/POE water treatment industry progresses to new levels and meets new challenges, issues regarding regulations and standards continually arise. As the industry waits for the EPA and U.S. government to finalize regulations, the industry is forced to ride out the MCL changes, rule withdrawals and estimated costs that each proposal brings. Listed here is a review of regulation changes the industry has seen in the last year and a brief look at which ones to watch for in the future.

Deck: 

Government Regulations and Safe Drinking Water Act Updates

Activation Date: 
August 10, 2001
Legacy
Legacy ID: 
12531

Continuous Microfiltration System Ensures Safe Drinking Water For Wisconsin Residents

The Kenosha Water Utility treatment facility, located on the shores of Lake Michigan in Wisconsin, needed to upgrade its two plants to meet the expanding water needs of the community it services. Continuous microfiltration helped meet those needs.

About The Author: 

For further information, phone USFilter at 800-525-0658.

Activation Date: 
May 21, 2001
Files: 
Legacy
Legacy ID: 
12342

Filter Cartridges

The following is some basic information compiled from industry experts at diverse companies. Additional information is available at the contact information provided.

Deck: 

The Basic Types, Materials and Applications for Various Filter Cartridges.

About The Author: 

Information provided by Ceramic Filters Co., Inc. Contact James Webb at 888-236-8586; fax 517-467-4587; eramic@frontiernet.net.

Activation Date: 
May 10, 2001
Files: 
Issue Reference: 
Legacy
Legacy ID: 
12352

Ultraviolet System Design

In the last issue, we reviewed ultraviolet (UV) disinfection as a suitable technology for treating biologically unsafe water supplies. In this article, we will focus on system design and understanding the many available options for residential and commercial applications.

Deck: 

Understanding Residential and Commerical UV

About The Author: 

Adam Donnellan is vice president of sales for Sunlight Systems. He represents the third generation of his family to be involved with UV water disinfection. He can be reached at adam@sunlightsystems.com

Activation Date: 
May 10, 2001
Files: 
Issue Reference: 
Legacy
Legacy ID: 
12355

Cooling Tower Solutions

Testing of a new ozonation system for cooling towers

Deck: 

Testing of a new ozonation system for cooling towers

About The Author: 

W. Craig Meyer is professor of Environmental Science at Pierce College, Woodland Hills, Calif. He has been involved with various aspects of water quality research and consults with companies regarding water quality issues.

Activation Date: 
May 9, 2001
Files: 
Issue Reference: 
Legacy
Legacy ID: 
12347

Cryptosporidium - A brief overview of a new technology

The occurrence of Cryptosporidium parvum and other pathogens in water supplies poses a dangerous problem to the water industry and human health. Read about a new technology that is helping rid of this problem.

About The Author: 

Danielle Duclos is a technical writer at Foresight Science & Technology, a firm specializing in bringing people and technology together. The company’s customers range from major corporations and the U.S. government to small firms. Foresight Science & Technology, New Bedford, Mass., is a contractor for EPA, DoD and several other federal agencies tasked with assessing the utility of this new technology work. Foresight maintains an active federally and in-house sponsored research and development program. Additional information can be obtained at www.seeport.com; 508-984-0018, ext. 13.

Activation Date: 
March 14, 2001
Issue Reference: 
Legacy
Legacy ID: 
12204

Oxidizing Arsenic III to Arsenic V for Better Removal

On June 22, 2000, the U.S. Environmental Protection Agency (EPA) proposed lowering the maximum contaminant level (MCL) for arsenic from 50 down to 5 micrograms/L (Federal Register, 2000).

About The Author: 

Dr. Dennis Clifford, P.E., is a professor of environmental engineering and chair of the Department of Civil and Environmental Engineering at the University of Houston. He has more than 30 years experience in teaching, research and consulting related to water and soil treatment. During the last 20 years, he and his students have extensively researched the subject of arsenic speciation, oxidation and treatment.

Ganesh Ghurye received his master’s degree in environmental engineering from the University of Houston, where he currently is a researcher in the area of water treatment. He has five years experience in developing arsenic treatment methods.

Activation Date: 
March 14, 2001
Files: 
Issue Reference: 
Legacy
Legacy ID: 
12210

Water Quality Deterioration in Distribution Systems

While temperature is acknowledged to be an important factor in water treatment, remarkably little study has been made of the adverse influence of low temperatures on physical treatment process effectiveness. An early study concluded that "there is no preventative or retarding effect on alum floc formation with low raw water temperatures."

Deck: 

Part 4: Microbiologically-Mediated Deterioration in Surface Water Supplies

About The Author: 

Thomas L. O’Connor, BSEE, MBA, is the project director for H2O’C Limited, Columbia, Missouri.

John T. O’Connor, EngD, P.E., is the prinicipal for H2O’C, Limited, Columbia, Missouri. Phone: 877-22-WATER; e-mail: water@H2OC.com.

Activation Date: 
February 19, 2001
Legacy
Legacy ID: 
12162

E. Coli Awareness

There are approximately 73,000 cases of E. coli annually in the United States, according to the Centers for Disease Control and Prevention. However, this infection is not just domestic but on a global scale.

Publication Date: 
December 28, 2000
Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11899