Water Treatment: Thinking Small   Water & Wastes Digest May 2003   Richard Merwin
As populations grow, as urban, suburban and ex-urban areas expand, demand for water increases and safety standards rise. An effective and creative way to deal with problems of growth and resource management might just be to think small. A case in point is the Olivenhain Municipal Water District's (OMWD) treatment facility in San Diego County, California.

Aeration for Ponds and Cisterns   Water Quality Products January 2003   Jeff Roseman, Aqua Ion Plus+ Technologies
Using oxygen for the natural cleansing of water is becoming a viable alternative for pond and cistern owners in reducing the use of chemicals to fight the bacteria and algae that can become a nuisance. An aerobic bacterium needs oxygen in order to maintain the balance of nature. This article will take a look at some methods for increasing oxygen content, Henry's Law and applications that benefit from increased levels of O2.
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Submersible Blowers Reduce Noise in Berlin Redevelopment   Water & Wastes Digest January 2003
A major environmental project to help rejuvenate a lake at the heart of Berlin attributes much of its success to unique submersible blowers from UK manufacturer Adams Ricardo.

New Wastewater Treatment Technology Emerges from Nevada Desert   Water & Wastes Digest January 2003
Out of a landscape parched for water?but certainly not ideas?comes a unique innovation in wastewater treatment from Premier Wastewater International (PWI tm). Based in southern Nevada, PWI has developed an economical treatment process that can remove more than 90 percent of the organic matter, according to Matt Russell, president and CEO.

Fine Bubble Aeration/Mixing System Cuts Lagoon Treatment Energy Costs   Water & Wastes Digest August 2002
The Biomixer Aeration and Mixing system is providing optimum dissolved oxygen transfer and mixing at this lagoon, in spite of the number of units being reduced from the original design of five units down to three. This is being obtained with the dissolved oxygen levels throughout the basin averaging 9.1 mg/l. Even at the influent end of the basin where the loading rate is the highest, the dissolved oxygen readings were above 8.5 mg/l.

Back to the Basics, Part 3   Water Quality Products July 2002   Jeff Roseman, CWS-1, Aqua Ion Plus+ Technologies
In this last section of a three-part series, the use of ozone, ionization, distillation and aeration is discussed in a simple fashion to help the beginner rationalize the importance for a full understanding of these technologies and the need, again, for a professional water treatment specialist.
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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.
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Biofilm Elements Treat Colorado Town   Water Engineering & Management January 2002
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Wastewater Impoundment Converted To Process Tank At Georgia Chemical Company   Water & Wastes Digest May 2001
Fisher Tank Company of Chester, Pa., has placed a leakproof steel liner into a 260-ft.-diameter, 14-ft.-deep wastewater treatment facility at the caprolactam production plant of DSM Chemicals North America, Inc., near Augusta, Georgia.
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Aeration Performance of Weirs - Part 2   Water Engineering & Management April 2001   Dr. Ahmet Baylar and Tamer Bagatur
The results of experiments of four types of weirs showed that drop height is the most important factor influencing oxygen transfer efficiency.

Aeration Performance of Weirs - Part 1   Water Engineering & Management March 2001   Dr. Ahmet Baylar and Tamer Bagatur
Oxygen is vital to the life cycle common to water. It is essential to keep organisms living, to sustain species reproduction and for the development of populations. Oxygen is soluble in water in direct proportion to the partial pressure in the gas phase, while solubility decreases as temperature increases. Salt water holds less oxygen than fresh water. Oxygen enters the water by absorption directly from the atmosphere or by plant photosynthesis. It is removed by respiration of organisms and by organic decomposition. During respiration and decomposition, animals and plants consume dissolved oxygen and liberate carbon dioxide.

Diffused Bubble Aeration for Radon and VOC Removal   Water Quality Products November 2000   James Jasensky
The Safe Drinking Water Act legislation signed in 1996 states that a federal waterborne radon guideline is to be in effect on or before October 2001. Passage of this guideline has made it important for well water treatment experts to familiarize themselves with effective options for radon removal.

Aeration Technology Adds Productivity, Saves Money During Contamination Clean-Up   Water Engineering & Management April 2000
Density-Driven Convection (DDC), developed by Wasatch Environmental, Inc., is a high-efficiency in-situ aeration technology that can save 50 percent or more of the cost of some groundwater treatment techniques and rid sites of contaminants in considerably less time, according to Wasatch President Les Pennington.

Aerators Stop Odors in Chicago   Water Engineering & Management January 2000
Chicago and its surrounding 51 communities cover an area of 375 square miles and have a population of over 3,000,000 people. This metropolis is served by a combined sewer network carrying both raw sewage and stormwater in a single pipe.