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

Roundtable Discussion: E. coli (Escherichia coli)

Escherichia coli, a.k.a. E. coli. A terrible, but familiar word to the public suggests sewage or animal waste contamination. E.

Deck: 

Recent outbreaks of E. coli have brought consumer’s attention to their drinking water. Understanding its source, regulations and prevention will be key to combating this waterborne illness

About The Author: 

Wendi Hope King is the editor of Water Quality Products magazine.

Publication Date: 
December 28, 2000
Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11900

Precision Tubing Ensures Purity of Water Filtration System

In today's laboratory environment, it is essential that pure water is available for numerous applications.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11737

Water Testing: Why Customers Should Be Informed

People must recognize that drinking water contamination is a serious problem. It is a problem that is constantly being addressed by government officials, public interest groups and the scientific community.

Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11678