August 2013, Vol. 25, No.8

Projects

As part of its complex wastewater infrastructure project, the City of Austin, Texas, recently hired AOC (Collierville, Tenn.) and ECS Environmental Solutions (Belton, Texas) to create an odor-control system for its new 6.3-km (3.9-mi) wastewater tunnel to increase capacity for the downtown district and facilitate residential and business growth in the area. 

ECS provided the odor-control equipment, including AOC’s Vipel® resin, for more than 300 m (1000 ft) of fiberglass ductwork and additional accessories. The ductwork ranges in diameter from 300 to 1800 mm (12 to 72 in.). Approximately half of the ductwork is buried and had to be able to withstand thousands of pounds of high-density traffic. Additional elements of the project include field joint kits, flexible connectors, control and back-draft dampers, bolt gaskets, and two fiberglass exhaust fans rated at approximately 1130 m3/min (40,000 ft3/min).  

AOC product leader Scott Lane provided technical assistance to reformulate the resin to meet the challenging conditions, which included temperature extremes and high-density traffic.  

  

The largest drinking water purification plant in Europe under construction in Ravenna, Italy, will feature GE Water & Process Technologies (Trevose, Pa.) ZeeWeed 500 membrane technology for advanced water treatment.  

Once operational, the new drinking water plant will treat an average flow of 95 million L/d, enough water to serve approximately 400,000 people. GE will provide the technology to the engineering, procurement, and construction joint venture led by Torricelli Srl (Terranuova Bracciolini, Italy), in partnership with Degrémont SpA (Paris). The facility features 40 cassettes filled with ZeeWeed 500 modules and distributed in eight filtration trains. 

Ravenna is located on the east coast of Italy near the Adriatic Sea and part of the Mediterranean Sea. Several years ago, Romagna Acque–Società delle Fonti SpA, the public company in charge of the water wholesale supply for Italy’s Romagna region, selected membrane technology to produce high-quality drinking water in an area often affected by long periods of drought. The region’s drinking water source is the Po River, the longest river in Italy, which has a high variation of solids and turbidity, especially after rain.
 

The Rancho California Water District near San Diego gradually has been replacing all gas-chlorine disinfection units with MicrOclor onsite hypochlorite generators manufactured by Process Solutions Inc. (Campbell, Calif.). By the end of summer, the district’s Elm Street Pump Station is expected to be operating the district’s 46th hypochlorite generator, which also will be the first to be used for reclaimed water.  

The principal use for the water will be irrigation for various users, including a sports park and golf courses. The peak flow rate is 20,000 L/min (5200 gal/min), and the new hypochlorite system will be an MC-200 with a capacity of 90.7 kg/d (200 lb/d) of free available chlorine.  

The district serves 120,000 people in the city of Temecula, along with portions of the city of Murrieta and the unincorporated regions of southwest Riverside County. The service area includes 1500 km (940 mi) of water mains, the Vail Lake Reservoir, and 47 groundwater wells.  

  

The Washington (D.C.) Suburban Sanitary Commission (WSSC) in Laurel, Md., has adopted Echologics’ (Mississauga, Ontario) acoustic pipe-condition assessment service under an $850,000 contract to assess the condition of selected water-distribution mains. 

Echologics is assessing the condition of 56 km (35 mi) of cast-iron distribution mains ranging from 150 to 350 mm (6 to 14 in.) in diameter that are scheduled to be replaced by WSSC starting in July 2014. WSSC will use the data to cost-effectively identify sections of pipe that are in the poorest condition and prioritize their replacement. 

Approximately 70% of the pipes did not require replacement, as they still had effective levels of remaining wall thickness or were at or near their original condition. WSSC validated the findings through extensive third-party testing of excavated samples of the surveyed pipe. 

WSSC, which serves 1.8 million residents in a service area that spans nearly 2600 km2 (1000 mi2), selected Echologics as a result of a pilot survey conducted in March 2012, in which more than 5330 m (17,500 ft) of distribution mains were assessed. 

  

The Maryland Department of the Environment has awarded a Bay Restoration Fund grant of $54,900 to the Town of Elkton, Md., for the town’s “performance optimization” of plant operations at the Elkton Wastewater Treatment Plant. The funds will be used to defray costs associated with the facility’s enhanced nutrient removal (ENR) operation and maintenance activities. 

Bay Restoration Funds are financed by water resource recovery facility users to upgrade Maryland’s facilities with ENR technology so the facilities are capable of achieving wastewater effluent quality of 3 mg/L total nitrogen and 0.3 mg/L total phosphorus. 

Operated through a public–private partnership by Severn Trent Services (Fort Washington, Pa.) since 1993, the facility was upgraded to ENR technology to improve water quality in Big Elk Creek. The upgraded facility is reducing effluent nitrogen to the Big Elk River and ultimately to Chesapeake Bay by 80% and phosphorus by 70%.  

  

Cleanup of the city of Kuala Lumpur’s river system in Malaysia is being aided with stormwater technology from Hydro International (Bristol, England). More than 100 of the company’s Downstream Defender® advanced vortex separators are being installed at strategic locations in the city’s network of drains and tributaries that discharge into the Klang and Gombak rivers.  

Located at the confluence of the two rivers, Kuala Lumpur is seeking to shift the rivers from their current Class III-V status (water quality not suitable for bodily contact) to a Class II-b (clean enough for recreational use) by the year 2020. The city has an annual rainfall of nearly 2400 mm, with peaks up to 280 mm in April and November. 

The orders from Kuala Lumpur are the largest ever made for the Downstream Defender and follow successful trials of the advanced vortex separation technology for the National Hydraulic Research Institute of Malaysia.  

  

Xylem Inc. (White Plains, N.Y.) recently announced two major contracts in East Asia. The company won a $2.9 million contract from the Beijing Drainage Group Co. Ltd. to install Xylem’s Flygt® pumps in 19 pumping stations in downtown Beijing. The new submersible centrifugal pumps will improve the stations’ water storage capability and prevent overflow by providing more-efficient drainage and flood control. 

Beijing Drainage Group is a wholly state-owned wastewater utility established with the approval of the Beijing municipal government. 

Xylem also has designed and installed the first ICEAS Advanced Sequencing Batch Reactor (SBR) and ultraviolet municipal wastewater treatment solution in Vietnam to improve the water quality of the Saigon River. This project will treat domestic wastewater in the region, which has a population of 175,000 people. The new wastewater treatment plant, located in Thu Dau Mot City, Binh Duong province, began operation in May. 

Enviro Engineering Corp., a business unit of Saigon Water Infrastructure Corp. based in Ho Chi Minh City, partnered with Xylem on the project. 

Consisting of Xylem’s WEDECO TAK55 open-channel ultraviolet disinfection system, the Sanitaire ICEAS Advanced SBR Process Solution, the system includes diffusers, decanters, blowers, and monitoring and controls, as well as a variety of Xylem’s Flygt N-technology pumps and compact mixers. The system replaces traditional technologies and has an average capacity of 17,650 m3/d. 

  

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