The Noman M. Cole Jr. Pollution Control Plant
(Lorton, Va.) recently completed major design–build upgrades to enhance flow equalization and add reclaimed-water distribution. The upgrades, designed by Dewberry (Fairfax, Va.) and constructed by M.A. Bongiovanni Inc. (Syracuse, N.Y.), include an $8 million flow-equalization facilities expansion project that includes the addition of 34,000 m3/d (9 mgd) of pumping capacity at the existing equalization pump station and a new 15,000-m3 (4-million-gal) equalization tank. A $15.2 million reclaimed-water distribution system enables approximately 2.12 million m3 (560 million gal) of effluent to be reused at the Covanta Energy/Resource Recovery Facility, including approximately 91,000 m3/yr (24 million gal/yr) to irrigate the county’s Laurel Hill Golf Course and Lower Potomac Ball Fields.
South Kent (Conn.) School,
a college preparatory school for boys established in 1923, hired DYMAR Corp. (Southbury, Conn.) to design an entirely new subsurface wastewater disposal system to handle all of the school’s current and future wastewater flow.
The school, which includes dormitories, classrooms, a gymnasium, a hockey rink, several athletic fields, and a library, is located 72 km (45 mi) west of Hartford, Conn., and produces 57,000 L/d (15,000 gal/d), with a projected future flow of 69,300 L/d.
Engineers chose to use CULTEC Inc. (Brookfield, Conn.) Contactor® 100 plastic subsurface leaching chambers. The chambers store and disperse effluent as it seeps into the native soils following conventional treatment to recharge groundwater. More than 1000 of the 203- 914- 317.5-mm (8- 36- 12.5-in.) chambers are arranged in a side-by-side configuration under an athletic field to provide a total effective leaching area of 5518 m2 (59,400 ft2). In addition, approximately 73 linear m (240 linear ft) of chambers are being used as infiltration rechargers for the surface drainage of the soccer field and to provide nitrogen dilution. The chambers have repeating support panels to add strength, feature a patented overlapping-rib connection, and have a greater contact with the primary leaching area, which promotes maximum infiltration.
Design firm Stantec (Edmonton, Alberta) will be lead design engineer and architect for a joint venture under a $614.8 million design–build contract with the U.S. Army Corps of Engineers, New Orleans District. Stantec will provide a full suite of integrated design services for the three permanent canal closures and pumps facilities to be built near Lake Pontchartrain and the London Avenue Outfall Canals in New Orleans.
The project will provide long-term sustainable measures for reducing the risk from heavy tropical rainfalls and 100-year storm surge events. Currently, interim structures and pumps that were installed after Hurricane Katrina are used to reduce this risk; the three new permanent facilities will form one of the largest drainage-pumping-station projects in the world and will operate continuously and independently during major hurricane events.
The San Antonio Water System recently hired Parsons Corp. (Pasadena, Calif.) in a joint venture under a construction manager at-risk contract for its critical brackish-groundwater desalination program. This $86 million contract includes preconstruction-phase collaboration with the water system program management and design teams, construction of all program components, and 6 months of treatment plant operations.
The scope of work includes 13 raw-water production wells, raw- and finished-water conveyance, residual conveyance, three deep-injection wells, a 38,000-m3/d (10-mgd) reverse-osmosis membrane water treatment plant, a 28,000-m3/d (7.5-mgd) finished-water storage reservoir, chemical treatment systems, supervisory and data acquisition controls, and a new administration building that incorporates a public tour route, pilot plant, and training facility.
Abengoa Water (Seville, Spain) recently chose to use the PX® Pressure Exchanger from Energy Recovery Inc. (San Leandro, Calif.) to help provide potable water to more than 600,000 inhabitants in two countries with severe water shortages. The technology will be used in desalination plants in Ghana in West Africa and Oman in the Persian Gulf. The technology is expected to save more than 52 million kWh/yr in each country.
Abengoa Water will construct the first desalination plant in Nungua, Ghana, for the Ghana Water Limited Co. and will operate the facility for 25 years. The plant will produce 60,000 m3/d. The second project, in Barka, Oman, is an expansion for the owners of the Barka I Independent Water and Power Project.
The City of Dubai, United Arab Emirates, has selected Parkson Corp. (Fort Lauderdale, Fla.) to build a sustainable, automated solar sludge-drying system in one of the largest solar-drying systems in the world. Designed in two stages, the open-air drying system will process 140,000 Mg/yr of sludge. At press time, construction was set to begin in late spring. Parkson’s Thermo-System® will deliver sludge to the drying unit, where it will be processed and dried with almost no staff intervention.
The new construction helps the city reduce energy costs and chemical use in response to mounting odor complaints. The OpenBed™ solar dryer process will save approximately $45,000 per year in chemical costs while reducing solids volume and cut 80% of the treatment plant’s hauling and tipping fee.
The Little Patuxent Water Reclamation Plant Addition No. 7 Project
(Savage, Md.), which was designed and engineered by Atkins (Surrey, England) for the Howard County (Md.) Bureau of Utilities, has been named the Best Civil Works/Infrastructure Project of 2012 in the Mid-Atlantic Region by Engineering News–Record. Atkins was the project’s lead design and engineering consultant. The project helps protect water quality in Chesapeake Bay by removing excess nutrients from reclaimed water, which serves 56% of Howard County’s population of approximately 295,000.
The Paluguillo Water Treatment Plant
in Ecuador has replaced several smaller potable-water systems in the region in a $4.6 million project. AUMA (Müllheim, Germany) electric actuators with a Modbus loop have been incorporated for valve control as part of the advanced automation capabilities. Developed by Empresa Pública Metropolitana de Agua Potable y Saneamiento, the plant has a capacity of 600 L/s and serves a population of 210,000 inhabitants. To ensure maximum flexibility, the entire system can be operated remotely from a main control room or locally.
STW Resources Holding Co.
(Midland, Texas) announced recently that its proprietary water-desalination system, which uses technology adapted from oil and gas fields, is fully functional at the Ranchland Hills Golf Club near Midland. The system converts 2650 m3/d (700,000 gal/d) of brackish water into fresh water used for fairways and golf-course greens.
According to STW Resources CEO Stanley Weiner, the system uses a proprietary technology and proprietary chemical combination that enables recovery of a higher percentage of water at a lower cost than achieved by most desalination systems. Weiner said the system also could be used on a large scale for cities and industries and that the company is in negotiations with certain municipalities for its use.
To meet the needs of San Diego’s growing population, the city completed a major expansion and upgrade of its oldest water treatment plant, increasing its capacity 67% by converting to state-of-the-art ozone disinfection. In recognition of this achievement, the Alvarado Water Treatment Plant Ozone Upgrade and Expansion Project was honored with the American Society of Civil Engineers (Reston, Va.) 2013 Outstanding Civil Engineering Achievement award. Upgrading and expanding the existing conventional treatment processes involved new pretreatment (flocculation and sedimentation basins) and dual-media filters, as well as a new replacement clear well.
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