Understanding the Alpha Factor
Membrane Technology
March 2008
By Malcolm E. Fabiyi
Applying the alpha factor and pure oxygen to reduce aeration power demand
Saving Money Under the Sun
Water & Wastes Digest
January 2008
By Bob Nobile
Three applications demonstrate how solar-powered circulators produce cost savings, odor control and energy efficiency
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Recycling & Reusing
Water & Wastes Digest
September 2007
By Paul Schuler
The U.S. Army and Aqua Engineers team up to establish an award-winning wastewater reuse system on a Hawaiian Army base
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Aerobic Vs. Anaerobic
Water & Wastes Digest
April 2007
By Ronald J Castle II & Julia Nemeth-Harn PE
Examining pretreatment of groundwater in small & rural systems
Accommodating Growth
Water & Wastes Digest
September 2006
By Rusti Holguin
Small wastewater plant upgrade incorporates MBRs and extended aeration to help with sludge
Blown Out of the Wastewater
Water & Wastes Digest
September 2005
By Jon Zabrocki, P.E. and Paul Larson, P.E.
By precisely controlling pressure in the air header and modulating airflow to each aeration zone to maintain set point DO levels, the energy usage is minimized through efficient operation.
Keeping Odor Under Control
Water & Wastes Digest
August 2005
By Ed Sullivan
“We are very concerned about maintaining an odor cap,” said David Williams, project engineer at Shell Oil (Shell Manufacturing) Martinez Refinery, California “Our treatment pond is about 1/4 mile from a residential community. We’ve got a delicate situation where even just a slight amount of odor could arouse complaints from the community. So, we keep a close eye on it.”
Aerators Enhance Aerobic Digestion Process
Water & Wastes Digest
March 2005
By Larry W. Moore and Charles Van Zandt
The Eden Wastewater Treatment Plant (WWTP) generates about 20,000 lb per day of waste activated sludge solids, which are aerobically digested prior to storage in sludge lagoons and ultimate land application.
A Reliable Tool
Water & Wastes Digest
April 2004
By Rick Davis
By implementing fluorescent technology in the measurement of DO levels, wastewater professionals may have a reliable tool that allows for the optimization of the biological processes and a reduction in the aeration costs related to energy usage.
Aeration System Stirs Up Savings
Water & Wastes Digest
March 2004
By Michel Gregory
Besides giving the coastal town’s budget a boost, the new aeration system is doing a better job of processing wastewater to a level of purity that allows its discharge into the Columbia River.
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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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.
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.
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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.
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