June 2011, Vol. 23, No.6

Projects

Last summer, Glasgow, Scotland, received the world’s largest Hydro-Brake® Flow Controls to prevent the waters of the White Cart Water, a normally placid, fast-flowing river, from flooding the south part of Glasgow during storm flows. Two of the hydro-brakes, which are manufactured by Hydro International (Clevedon, England), are 8 m long and 6 m in diameter, and three are 6.5 m long and 4 m in diameter.

Each device’s internal geometry is designed to enable water to flow unrestricted through it for as long as possible. When water upstream reaches a predetermined depth, a self-activating vortex is created that throttles back the water and releases it at a measured, controlled rate.

The two largest devices, which were installed at Blackhouse Dam in July 2010 (pictured at left) and Kittoch Dam in August 2010, required a new installation method. The devices were formed in place with thinner-than-normal stainless steel and reinforced with 100 m3 of concrete to form a 600-mm-thick outer casing. The resulting structures are able to resist the huge forces of the flood water while retaining the vortex-controlling geometry inside.

 

The new Senkulmen Enterprise Park in Oliver, British Columbia, built by the Osoyoos Indian Band (Oliver), features an advanced wastewater treatment plant based around proprietary USBF® technology manufactured by ECOfluid Systems Inc. (Burnaby, British Columbia). The USBF is designed to provide efficient, cost-effective biological nutrient removal. Subsystems include a rotary-drum screen, drum-microscreen filtration, and an open-channel ultraviolet disinfection system.

The system will have an initial capacity of 200 m3/d. Three future stages, each sized to add an average day flow of approximately 200 m3, will bring the ultimate capacity to 800 m3/d.

The entire process is automatic and monitored and controlled by a supervisory control and data acquisition system, reducing operators’ direct onsite input requirements. The facility will discharge Class A effluent to constructed wetlands. Effluent concentrations of biochemical oxygen demand, total suspended solids, and total nitrogen are expected to be less than 10, 10, and 20 mg/L, respectively.

 

The city of Tacoma, Wash., selected Echologics Engineering Inc. (Toronto) to perform noninvasive leak-detection and pipe-condition assessment for 32 km (20 mi) of pipe in its water system. The project will help the city improve its operational efficiency and conserve water by cost-effectively detecting leaks and prioritizing sections of pipe for repair or replacement.

 

As part of a facility upgrade, the Greater Hazleton (Pa.) Joint Sewer Authority has selected BioAir Solutions (Voorhees, N.J.) to design and engineer a system to remove odors from a solids holding tank and lift station at the wastewater treatment plant. The system calls for an EcoFilter® EF62 unit to treat hydrogen sulfide, ammonia, and organic odors for an overall reduction in airstream odors exceeding 90%.

 

American Electric Power (Columbus, Ohio) is installing a GE ABMET® wastewater bioreactor system at the utility’s Mountaineer coal-fueled power plant in New Haven, W.Va. The proprietary biological treatment system uses a molasses-based product as a nutrient for microbes that reduce selenium, a constituent found in many coal-fired power plant water emissions. The technology utilizes special strains of common, nonpathogenic microbes that facilitate the conversion of soluble selenium into elemental selenium, which is removed from the system during periodic backwashing.

Installing the system will enable the 1300-MW generating station to comply with a new discharge limit for selenium. Construction of the treatment facility began in July 2010; it is scheduled to become operational by the end of 2011.

 

As part of the expansion and modernization of Chhatrapati Shivaji International Airport at Mumbai, India, Aquatech (Canonsburg, Pa.) will install a 10,000-m3/d wastewater treatment and reuse system. To meet the demands of rapid growth in international flight operations and passenger traffic, a new terminal — the Common User Terminal — is being planned as part of the expansion of the airport.

In view of the scarcity of fresh water in the area, the system, based on CASS™-SBR (sequential batch reactor) technology followed by ultrafiltration and reverse osmosis, will treat the wastewater for the purpose of recycle and reuse.

 

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