Stormwater Treatment: A Look at Various Methods, Hydrodynamic Separators

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.

Activation Date: 
July 10, 2002
Legacy
Legacy ID: 
13203

Revisiting the Selection of Stainless Steel in Water and Wastewater Treatment Environments: Part 3

Based on the City of Hollywood’s experience, the use of 316L stainless steel should be evaluated carefully due to the potential for problems in the erection and construction of water treatment facilities that will be in contact with high chloride water and/or other corrosive chemistries. As with many membrane facilities, much of the stainless steel is exposed (not buried), which subjected it to atmospheric as well as water quality problems. Therefore, unless the quality control of the raw and reject water (chemical, physical and microbial) can be assured, 316L stainless steel may not be the appropriate material for engineers to specify.

Deck: 

Materials Selection

About The Author: 

Frederick Bloetscher, Ph.D., P.E., is with Public Utility Management and Planning Services, Inc., Hollywood, Fla. Phone 954-925-3492; Fax 954-925-2692; e-mail h2o_man@bellsouth.net
Richard J. Bullock is with Weir Materials and Foundries, Ponte Vedra Beach, Fla. Phone 904-285-8039; Fax 904-285-8043; e-mail r.j.bullock@att.net.
Robert E. Fergen, P.E., is with Hazen and Sawyer, P.C., Raleigh, N.C. Phone 919-833-7152; Fax 919-833-1828; e-mail refergen@hazenandsawyer.com.
Gerhardt M. Witt, P.G., is with Gerhardt M. Witt & Associates, Inc., West Palm Beach, Fla. Phone 561-642-9923; Fax 561-642-3327; e-mail wittassoc@aol.com.
Gary D. Fries, P.E., is with Boyle Engineering Corporation, Orlando, Fla. Phone 407-425-1100; Fax 407-422-3866; e-mail gfries@boyleengineering.com.

Activation Date: 
July 2, 2002
Legacy
Legacy ID: 
13198

The Great Activated Carbon Dilemma

Drinking water treatment professionals have long held fast to the belief that granular activated carbon (GAC) based on bituminous coal provides the best performance for their demanding application. That’s why, when an article in 1999 cited evidence that a lignite-based GAC outperformed a bituminous-based carbon, industry experts were surprised and more than a bit skeptical.

Deck: 

Fresno Discovers Big Difference Between Reagglomerated Carbon and Direct Activated Carbons

About The Author: 

Neal Megonnell is senior group leader for Calgon Carbon Corp.

Activation Date: 
June 26, 2002
Issue Reference: 
Legacy
Legacy ID: 
13182

Ultraviolet Dechlorination Technology

At the Procter & Gamble manufacturing plant in Greensboro, N.C., an Aquionics ultraviolet (UV) dechlorination unit was installed before two banks of reverse osmosis (RO) membranes. Trials that ran soon after the UV system’s installation showed a dramatic reduction in the RO membrane wash frequency—down from an average of eight cleanings per month to only two per month.

Deck: 

Reverse Osmosis Membranes Maintenance Costs Reduced

About The Author: 

Aquionics offers more than 20 years experience in the manufacture, application and development of UV equipment for progressive, nonchemical disinfection and contamination control. For more information, call 800-925-0440; www.aquionics.com.

Activation Date: 
June 26, 2002
Issue Reference: 
Legacy
Legacy ID: 
13172

Evaluating Activated Carbons

New
challenges are emerging in the industry that require new methods and product
developments. This article discusses additional test methods for the AC
industry.

Deck: 

ASTM, AWWA and EPA Standard Methods and New Test Methods for AC

About The Author: 

Henry G. Nowicki, Ph.D. and MBA, directs the PACS Laboratory testing and consulting services and new business developments at PACS. He has obtained three patents and published more than 100 articles about environmental issues and AC adsorption and has been an expert witness in more than 30 legal cases. Dr. Nowicki may be reached at hnpacs@aol.com; www.pacslabs.com.

Mick Greenbank, Ph.D., is a surface chemist with 23 years of
varied experiences in AC and holds seven patents. He directs new test methods
development and application and provides special projects, consulting and
training for PACS. Dr. Greenbank teaches “Selecting the Best Activated
Carbon for the Application,” a PACS shortcourse. He may be reached at
mickpacs@aol.com.

Homer Yute is a mathematics and computer programming expert
who has developed seven software programs for the AC industry.

All authors may be reached at PACS, Inc., 409 Meade Dr.,
Coraopolis, PA 15108; 724-457-6576.

Activation Date: 
May 28, 2002
Issue Reference: 
Legacy
Legacy ID: 
13128

Packaged Treatment Plant Treats Tough Water Supplies Consistently, Economically

Since the 1960s, municipalities and industries have used packaged water treatment plants to successfully and economically treat small water supplies. These packaged plants have offered a smaller footprint, lower capital cost and easy operation.

About The Author: 

Darin St. Germain is a product manager at USFilter and is a registered professional engineer in the state of Iowa. Prior to USFilter, he was employed as a lab and operations assistant for the city of Grand Forks, N.D. water treatment plant.

Activation Date: 
May 7, 2002
Legacy
Legacy ID: 
13106

Growing Awareness of POU

The future of safe drinking water lies squarely in the hands of the point-of-use (POU) water purification industry. Growing awareness among decision-makers and consumers is the force behind the increasing importance of the POU industry.

About The Author: 

Glenn Land is founder and president of Aduk, Inc. Bill Harrison is vice president of marketing. They may be reached at 276-773-2097.

Publication Date: 
April 25, 2002
Activation Date: 
April 25, 2002
Issue Reference: 
Legacy
Legacy ID: 
13071

Membranes: Fouling & Cleaning

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.

About The Author: 

Bjarne Nicolaisen is vice president of business development for the crossflow membrane business at Osmonics, Inc.

Activation Date: 
April 25, 2002
Issue Reference: 
Legacy
Legacy ID: 
13065

Using Advanced Adsorptive Media for Arsenic Treatment

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.

Deck: 

New POU Technologies May Be the Answer for Small Municipalities Facing High Costs

About The Author: 

Greg Gilles is vice president of technical services and Jennifer Mathis is a sales representative for Apyron Technologies, an Atlanta-based material science company developing advanced solutions for arsenic treatment.

Activation Date: 
April 2, 2002
Legacy
Legacy ID: 
13040

Project Compares Brackish Water Desalination Technologies – Part 2

Part one of this article appeared in the February issue and described how nanofiltration, reverse osmosis and electrodialysis reversal are being run side-by-side at the Brackish Water Demonstration Facility in California.

About The Author: 

Jim Passanisi is with the City of Port Hueneme, Calif., Janet Persechino is with Ionics, Inc., Watertown, Mass., and Todd K. Reynolds is with Kennedy/Jenks Consultants, San Francisco, Calif.

Activation Date: 
March 5, 2002
Legacy
Legacy ID: 
12989