Controlling Micro-Organisms
Water & Wastes Digest
December 2004
By Ivars Jaunakais
This article deals with the control of microorganisms by disinfection with chlorine
and DPD chlorine testing.
Measuring Chlorine Disinfection
Water & Wastes Digest
December 2004
By Frank Kaiser and Bill Fehrman
This disinfectant is used by more than 90% of the drinking water plants in the U.S., and more than 200 million Americans and Canadians receive chlorine-disinfected drinking water every day.
Preserving Pipelines
Operations & Maintenance Supplement
November 2002
Richard N. Schantz, P.E.
Well-maintained and functional sewer systems are a major asset in any community, but they require regular cleaning, inspection and maintenance. Chemical grouting too often is viewed as a stopgap measure to reduce groundwater infiltration. In reality, grouting does much more to maintain sewer line integrity. It also is a soil-sealing process that stabilizes the sewer bedding soil, preventing washout of bedding fines and resulting pipe misalignment and joint failure.
Wet Chemical TOC Analysis
Water & Wastes Digest
October 2002
Karnel R. Walker, Dan Davis, and Robert H. Clifford, Ph.D.
The goal of this article is to demonstrate that the Shimadzu TOC-VW can effectively oxidize the Humic Acid (HA) matrix at high accuracy and precision levels never before witnessed by the wet chemical TOC community. The Shimadzu TOC-VW Carbon analyzer is the only TOC on the market that uses three oxidation techniques of UV light, heat, and persulfate in a single analyzer.1
Preserving Pipelines
Water & Wastes Digest
October 2002
Richard N. Schantz, P.E.
Chemical grouting too often is viewed as a stopgap measure to reduce groundwater infiltration. In reality, grouting does much more to maintain sewer line integrity. It also is a soil-sealing process that stabilizes the sewer bedding soil, preventing washout of bedding fines and resulting pipe misalignment and joint failure.
Shifts in Analytical Requirements
Water Quality Products
September 2002
Troy Ethan, Spectrum Laboratories
To remain successful, the water treatment professional should take advantage of advances in in-field testing as well as advances in laboratory analyses. This article describes the shifts in analytical requirements recommended to satisfy consumer desires and promote expansion of the POU/POE water treatment industry.
PDF Version
Advanced Technology Brings the Power to Chlorine Dioxide
Water Quality Products
May 2002
Michael Cochran, Engelhard Corp
Chlorine dioxide is an extremely effective and powerful biocide that has been used for many years as a bleaching agent and slimicide in the pulp and paper industry, as a disinfectant in municipal water treatment and in many other industrial water treatment operations. However, significant capital and operating costs have limited the use of chlorine dioxide to large-scale applications. New technology now makes it practical to use the biocide in a wider range of water treatment applications.
PDF Version
Back to the Basics, Part 1
Water Quality Products
May 2002
Jeff Roseman, CWS-1, Aqua Ion Plus+ Technologies
Basic water chemistry, terminology and applications can be very complicated and not seem so basic to individuals without a chemistry background. This series of articles will help shed light on the chemistry of water and the mysteries that it can contain, plus explain the technologies used to treat water so the purchaser can make an educated attempt to find the right solution for a particular application. There are no cut-and-dry formulas for water treatment and certainly no cure-all for every application or problem, but with an understanding of how water works and the technologies developed to treat water, a person can utilize his resources to come up with solutions for his particular need or application.
PDF Version
Practical Engineering Combined with Sound Operations Optimizes Phosphorus Removal
Water Engineering & Management
April 2002
Daniel Bolduc and James Fitch, P.E.
Built in the early 1970s, The Oakland, Maine, Wastewater Treatment Facility (WWTF) treats and discharges approximately 300,000 gallons per day (gpd) of wastewater to the Messalonskee Stream. The facility was designed as a conventional activated sludge secondary treatment system to be used principally for BOD and TSS removals. The secondary effluent enters the Messalonskee Stream upstream of several impoundments. This practice has resulted in a steady decline in the water quality of the stream as evidenced by increased algae blooms and other signs of euthophication in impoundments located downstream of the discharge.
PDF Version
Chlorine Taste in the Customer’s Drinking Water?
Water Quality Products
March 2002
By Ron Grage, Chlorinators Incorporated
Chlorine produces bacteria-free water and eliminates algae and slime. It also removes hydrogen sulfide from ground water (wells and springs) and eliminates iron bacteria (cenothrix), which are associated with objectionable odor and taste.
Despite these important facts, some people still object to chlorine in their drinking water. Comments such as “I don’t like the way chlorine makes my water taste” are common.
Consider the Source
Water Engineering & Management
February 2002
Bill Swichtenberg
A report released by the Environmental Working Group (EWG)
and U.S. Public Interest Research Group (U.S. PIRG) has taken aim at
chlorination byproducts (CBPs) in tap water. The group‘s assessment
states that more than 100,000 women are at elevated risk of miscarriage or
birth defects because of CBPs in tap water.
PDF Version
New Mixed Oxidant Controls Belt Press Odors
Water & Wastes Digest
February 2002
A Midwest municipality needed to find a way to eliminate hydrogen sulfide from the atmosphere in the sludge dewatering area as well as on the plant grounds. The successful elimination of noxious and toxic gas would not only make a safer, healthier environment for the workers involved but would also result in a reduction in the corrosion of metallic components in the dewatering area, while greatly reducing odor complaints from neighbors.
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