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Water Environment & Technology (WE&T) is the premier magazine for the water quality field. WE&T provides information on what professionals demand:
cutting-edge technologies, innovative solutions, operations and maintenance, regulatory and legislative impacts, and professional development. |
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November 2007, Vol. 19, No. 11 |
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WE&T Features
Rain or Shine, 24/7
Philadelphia’s mix of water quality monitoring methods ensures around-the-clock data collection during both wet and dry weather
Steve Ostrowski, William Richardson, Joseph Perillo, and Gary A. Burlingame
| Like many large cities, Philadelphia is working to improve the water quality of its urban stream watersheds. In accordance with the Clean Water Act and Pennsylvania’s Clean Streams Law, the Philadelphia Water Department monitors its urban watersheds to assess their overall chemical and biological health. However, the city found that traditional grab sampling did not sufficiently characterize changes in stream water quality that occur throughout a storm event. Therefore, Philadelphia invested in additional monitoring technology so that it could collect continuous water quality data regardless of the weather conditions. Read full article (login required) |
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Up to the Challenge
IFAS helps growing Texas city meet discharge limits, expand capacity
David R. Jackson, Leonard E. Ripley, Tod Maurina, and Sarah Hubbell
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Facing new ammonia discharge limits of 3 mg/L and in need of additional capacity, the City of The Colony, Texas, began construction on its wastewater treatment plant in early 2005. The city chose to convert from contact stabilization basins to an integrated fixed-film activated sludge (IFAS) system within its existing basin volume. Upon full-scale implementation of the new IFAS basins, the plant saw immediate improvement in treatment performance and was able to comply with ammonia discharge limits for the first time in its history. Read full article (login required) |
2007 WEF Awards
Each year, the Water Environment Federation (WEF; Alexandria, Va.) presents a variety of awards that recognize excellence and achievement in the water environment profession. Awards are presented in the categories of Individual Service and Contribution, Education, Organization and Association Recognition, Operational and Design Excellence, and Published Papers. Read full article
Operations Forum Features
Proper Dose
Getting the most from your polymer
Christopher Boyd
In today’s economy, with the threats of privatization, no more federal money, and shrinking budgets, optimizing your biosolids dewatering is essential to affecting the bottom line.
After disposal costs, polymer and chemical costs are usually the greatest contributor to solids handling budgets. The |
 | wrong polymer or the wrong polymer dose can make the bottom line swell without providing much benefit. Read full article (login required)
Mechanics Versus Membranes
Comparing mechanical and membrane solids thickening
Olav Natvik, Elvio Zaghi, Chandresh Acharya, Richard Todd, and Tom Copeland
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When planning the upgrade from 2.6 to 5.0 mgd (9900 to 19,000 m3/d), engineers and operators at the Oxford Pollution Control Plant (London, Ontario) compared traditional mechanical sludge-thickening technologies, such as gravity belt thickeners and rotary drum thickeners (RDTs), with an innovative use of vacuum membranes for waste activated sludge (WAS) thickening. |
The side-by-side comparison reviewed the technical, financial, and operations and maintenance (O&M) requirements of thickening blended primary and WAS solids in a new building containing RDT equipment versus retrofitting existing sludge holding tanks to hold membranes to batch-thicken WAS to 4.5% and thickening the primary solids separately within the primary clarifiers. Read full article (login required)
22nd Annual U.S. EPA Clean Water Act Recognition Awards
The winners of the 22nd annual U.S. Environmental Protection Agency (EPA) Clean Water Act Recognition Awards have demonstrated outstanding achievements in the water quality field. Nominated by regulators and evaluated by specially appointed selection panels, these U.S. wastewater treatment facilities, programs, and projects met EPA’s rigorous criteria. These winners were honored at an awards ceremony held during WEFTEC®.07 in San Diego. See the list of winners as printed in the magazine. Read the full profiles of each winning facility.
©2007 Water Environment Federation. All rights reserved. |
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