February 2011, Vol. 23, No.2


The Edmonton (Alberta) International Airport (EIA) has selected Naturally Wallace Consulting (Vadnais Heights, Minn.), teamed with Associated Engineering (Edmonton), to design a major expansion of the airport’s wetland system that treats deicing chemicals. The existing constructed wetland system at EIA has been treating deicing runoff for almost a decade, but with double-digit growth in passenger volume, the airport needs a major increase in overall treatment capacity.

The new design includes the installation of Forced Bed Aeration™ technology developed and patented by Naturally Wallace Consulting. The system expansion is designed to produce a fivefold increase in glycol treatment capacity. Construction is slated to begin this spring.


In October 2010, the $137 million Johns Creek Environmental Campus (JCEC) in Fulton, Ga., received the National Design–Build Award for a water or wastewater project of more than $25 million from the Design–Build Institute of America (Washington, D.C.).

The 57,000-m3/d (15-mgd) JCEC, which opened in July 2010, features low-impact design elements with extensive noise- and odor-abatement technologies and will use membrane bioreactor technology to treat wastewater for nonpotable reuse. It’s also the largest membrane bioreactor plant in the United States.

The facility is built of red brick and looks much like a historic mill on the Chattahoochee River. With all treatment processes taking place inside, the plant’s operation is virtually invisible to the public.

Brown and Caldwell (Walnut Creek, Calif.) teamed with Archer Western Contractors (Atlanta) to design and construct the JCEC project in 40 months.


The Johnson County (Kansas) Water District will use approximately 3050 m (10,000 ft) of bar-wrapped concrete cylinder pipe for its 175th Street Water Transmission Main project. The pipe, manufactured by Hanson Pressure Pipe (Irving, Texas), was chosen for its high performance, lower cost, and ease of installation.

Bar-wrapped pipe is manufactured in longer lengths and weighs less than other types of concrete pressure pipe, allowing for a cost-effective installation.

The pipeline extension expands the district’s water transmission system into the southern portions of the county to enable future residential and commercial development. Johnson County, which includes many of Kansas City’s suburbs, has the fastest growing population in the state.


In September, Loudoun Water (Ashburn, Va.) marked completion of two reclaimed-water mains in an area just north of Dulles Airport. Once in operation, the more than 3900 m (13,000 ft) of 400- and 300-mm (16- and 12-in.) “purple pipes” will deliver Level 1 (highest quality) reclaimed water to customers for use in several commercial applications, including irrigation, cooling of HVAC systems, and chilling of data centers. Loudoun Water hopes to have 30% of its reclaimed water reused by 2015.

The reclaimed-water projects will benefit county residents in a number of ways. First, they will provide and promote green, sustainable alternatives to using drinking water for nonpotable purposes and will count for “water efficiency” credits for LEED certification. Second, they will cut the amount of effluent discharged into Broad Run, leading to less nutrient contamination in Chesapeake Bay. Third, local businesses will pay less for using the reclaimed water, and Loudoun Water will use less energy to deliver the reclaimed water to its customers compared to drinking water.


The town of Noblesville, Ind., installed a solar drying system to make its wastewater residuals into a 75% dry Class A biosolids product. The system will save the plant considerable money on disposal costs, compared with the previous method of landfilling unclassified, wet biosolids directly from a belt press.

The system, a THERMO-SYSTEM® Active Solar Sludge Drying System manufactured by Parkson (Fort Lauderdale, Fla.), uses a two solar-assisted chamber design with a 145-kW supplemental heating system.

The supplemental heating system consists of water-to-air heat exchangers positioned throughout the drying chambers that utilize excess hot-water capacity from an existing plant boiler. This supplemental heat, which normally would be wasted to the atmosphere, will increase the drying performance of the system by at least 50%.




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