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

Choosing the Right Disinfection Technology for a Municipal Drinking Water Plant - Part 1

Managers of water treatment plants must be able to choose the right disinfection system to bring their plants into compliance with government regulations.

Deck: 

Regulations

About The Author: 

About the Authors:
Dr Hubert Fleming is vice president of Water Purification Solutions, Severn Trent Services, Inc., Fort Washington, PA.

Wayne Huebner is general manager of Capital Controls Group, Severn Trent Services, Inc., Colmar, PA. With headquarters outside Philadelphia, PA, Severn Trent Services, Inc. is a provider of water purification products, laboratory and operating services and information technology solutions.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11922

An Overview of Ozone in Water, Wastewater Treatment

There are more than 2,000 installations worldwide that use ozone to treat drinking water. Ozone is an effective disinfectant for treating municipal and industrial wastewater, enabling the end user to meet EPA pre-treatment standards.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11894

Well Water Treatment: Ozone Helps Solve Water Problems at Bassi Ranch

An analysis of the raw well water (Table 1) shows a pH of 7.9 and 30 color units with >20 mg/L hydrogen sulfide, 5.6 mg/L iron and 0.6 mg/L manganese. Odor was detected at 10 threshold odor number (TON), indicative of the high hydrogen sulfide levels. To meet these water problems head-on, the homeowners formed the Bassi Ranch Mutual Water Co. in 1992.

About The Author: 

Ted Rich has been the director of marketing for ClearWater Tech LLC of San Luis Obispo, Calif., since 1992. The company manufacturers a complete line of mid-sized ozone generators for a variety of water treatment applications. For more information, visit the ClearWater Tech website at www.cwtozone.com; 800-262-0203; cwt@cwtozone.com

Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11830

Membrane Filtration As an Alternative: Part 2

Part one of this article appeared in the July issue and discussed microfiltration and utrafiltration. This article discusses nanofiltration and reverse osmosis.

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: 
11813

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

Legionella: Minimizing Risks

Legionellosis, the disease caused by Legionella spc., is common, though most people would guess it is extremely rare. Outbreaks of Legionellosis, defined as a cluster of three or more cases in a single locale, occur regularly in the United States and much of the developed world. Outbreaks have been reported in Australia, Holland, Thailand, Japan, England and many other countries. In the U.S., the Center for Disease Control (CDC) receives reports of 1,000 cases of Legionellosis annually.

About The Author: 

W. Craig Meyer is a professor of environmental sciences at Pierce College, Woodland Hills, California.

Publication Date: 
December 28, 2000
Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11799

A New Look at Disinfection Byproducts in Drinking Water

The application of disinfectants in drinking water treatment for controlling microbial quality has drawbacks. These include the formation of potentially harmful disinfection byproducts (DBPs) that can be potential carcinogens (e.g., trihalomethanes [THMs] when chlorine is used as a disinfectant). The general equation is:

 

ÊÊÊNOM + Disinfectant -> DBP

ÊÊÊWhere NOM = Natural Organic Matter

About The Author: 

Dr. Taha F. Marhaba is assistant professor in the Department of Civil & Environmental Engineering and the New Jersey Institute of Technology (NJIT). He is involved in drinking water research, more specifically disinfection and disinfection by-products. His recent research accomplishments were the development of the spectral fluorescent signatures (SFS) method for rapid determination of natural organic matter fractions in water. He is a registered professional engineer in the states of New Jersey and Delaware.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11528

Ultraviolet Technology: The Non-Chemical Alternative for Well Water Disinfection

As consumer awareness grows in regard to the quality of water consumed every day from the numerous well water systems across America, the process that is gaining the most attention is that of disinfection.

About The Author: 

Scott Russell is the residential products manager at Ideal Horizons. He has more than six years experience in residential UV applications with a strong technical background in both electrical and mechanical issues. Russell can be reached at Ideal Horizons, 212 Ideal Way Poultney, VT 05764; 802-287-4485; fax 802-287-4486; www.idealhorizons.com.

Activation Date: 
December 28, 2000
Issue Reference: 
Legacy
Legacy ID: 
11490

Georgia Golf Course Greens Up With Ultraviolet Disinfection

The process of reusing wastewater for sprinkling at the Sugar Hill Golf Course in Gwinnett County, Georgia, was time consuming, costly and problematic. An in-line ultraviolet disinfection unit installed at the treatment plant solved the problem.

Activation Date: 
December 28, 2000
Legacy
Legacy ID: 
11463