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Water/Wastewater I

Drought Intolerant Water shortages plague growing geographies By Linda Mastaglio

PHOTO BY BURNS & MCDONNELL

The four-phase Wichita Aquifer storage and recovery program wil provide water supply for the Wichita, Kan. area for the next 50+ years.

Water remains a dwindling resource in many parts of the U.S. The subsequent problems are exacerbated by the drought conditions that have plagued certain regions throughout 2011 and are forecast to continue this year and beyond. Drought conditions are primarily focused in Southern and Western states. Texas, for example, faced the driest 12 months in its history during 2010 and 2011. With an average of 8.5 in. of rain through last September, the period’s total precipitation was 13 in. below normal. The conditions not only impacted water utilities, but caused harm to infrastructure and buildings. Dry soil caused water pipelines to burst, while building foundations buckled and asphalt roads cracked and crumbled. Furthermore, abnormal dryness and moderate drought reached Northern and Central California and significant parts of Nevada. According to the U.S. Dept. of Agriculture’s National Drought Summary, not one drop of rain fell in Eureka, Nev. or Fresno, Cal. during December 2011—the first such occurrence since 1989. Residents of Reno, Nev. faced their first completely dry December since 1883. n


EBAA IRON


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Water/Wastewater I

Five for the Future

Leading Water Projects Underway Today Wichita Aquifer

Wichita, Kansas Ongoing The large and complex Wichita Aquifer storage and recovery program will recharge the Equus Beds aquifer, protect water quality and provide water supply for the Wichita, Kan. area for the next 50+ years. The ongoing, fourphase program will restore the aquifer’s 1,400-sq-mile underground water reserve. Phase III and IV are in the planning stages and will likely provide an additional 60 MGD of diversion, recharge and recovery capacity.

Raw-Water Tunnels

Austin, Texas Completion: 2014 The raw-water tunnels and intake system for Austin’s Water Treatment Plant No. 4 include a 9-ft-dia, concrete-lined raw-water tunnel and a 7-ft-dia, steel-lined transmission tunnel connecting the pump station to the treatment plant. The raw-water intake structure is in Lake Travis in water depths up to 150 ft and the raw-water access shaft at the pump station is 30 ft in dia and over 400 ft deep.

Andermatt Wastewater Treatment Plant

TOP TO BOTTOM: PHOTOS BY BURNS & MCDONNELL; MWH; WABAG; WABAG; PUB

Uri, Switzerland Completion: 2013 Plant expansion is challenging due to a small site, rough climatic conditions at a height of 1,400 meters and the need to prevent noise and emissions in this resort area. Pre-treatment will involve a fine-screening process to remove coarse substances from the wastewater while simultaneously reducing the required biological-tank volume. Deep-bed filtration will aid discharge of the cleaned wastewater into the River Reuss.

Männedorf Wastewater Treatment Plant

Location: Zürich, Switzerland Completion: 2013 The treatment facility is replacing its existing sand filtration system with a moving bed system in combination with activated sludge to enhance the biological-treatment stage. The current wastewater-filtration system will be converted to a dual-layer filtration and the number of filters will be doubled, from three to six. This will both increase plant-treatment capacity and provide for more flexible and safer plant operation.

Changi Water Reclamation Plant

Singapore Completion: 2014 The Changi Water Reclamation Plant is one of the largest and most advanced facilities of its kind in the world. The plant occupies 32 hectares, just one-third the equivalent footprint of a conventional facility. Its current capacity is 176 MGD. The expansion involves the addition of a membrane filtration treatment process to increase capacity. Equipment will be integrated with existing structures where feasible to reduce costs.

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February 20, 2012 | W 3


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Water/Wastewater I

Salt Lake City Suburb Adds Expandable Water Treatment Plant

When complete, the Southwest Groundwater Treatment Plant will include three reverse osmosis trains and one bypass train utilizing ultraviolet light disinfection technology and cryptosidium removal bag filters for water treatment.

New treatment plant to begin production in March 2012.

The Jordan Valley Water Conservancy District is developing a new groundwater treatment plant next to the Jordan River in West Jordan, Utah. The plant will remove contamination from the local aquifer and produce 4,735 acre-ft-per-year of treated water using reverse osmosis. Flatiron is constructing the 38,000-sq-ft process building, three reverse osmosis trains,

water to the plant and return purified water back to the owner’s drinking water transmission system. The plant’s byproduct, a brine waste stream, will be piped 21 miles to the Great Salt Lake. Scheduled for completion in March 2012, the $26-million project is designed to accommodate future expansion to increase the plant’s capabilities from 7 MGD to 14 MGD. n

one bypass train utilizing ultraviolet light disinfection technology and cryptosidium removal bag filters. The construction of separate treatment trains is necessary to incorporate deep and shallow groundwater wells, supply wells, pipelines, a byproduct disposal system and associated facilities. Flatiron is also installing a new 1,400-ft-long pipe system to bring contaminated

Drain Solution Minimizes Construction Impact at FedEx Hub The FedEx Express (FedEx) Memphis World Hub has made Products Inc. was chosen for the solution. “The water the Memphis International Airport the second busiest cargo collector system had to be installed below the existing airport in the world. The firm recently worked with Allen & concrete pavement and required demolition to allow for Hoshall Inc. to construct a two-story canopy for international the install,” Eberle says. “We would not have been able to sorting operations that required a drainage collection system successfully deliver this scope of work without CONTECH’s to remove sheet flow from the in-depth understanding of the system construction area. and attention to detail, schedule and “We would not have been able to cost.” Slotted Drain is fabricated “Logistics and schedule sensitivity have been paramount from CONTECH corrugated steel successfully deliver this scope requirements to achieve the pipe, which is cut along a longitudinal of work without CONTECH’s success that FedEx expects and axis. A trapezoidal or straight-sided Frierson plans to deliver,” says grate with reinforcing spacer plates in-depth understanding of the Ben Eberle, pre-construction is welded in place to form a system and attention to detail, manager with T.W. Frierson 1 ¾-in.-wide slot opening which schedule and cost.” Contractor Inc. A Slotted Drain™ collects runoff and channels it to pipe from CONTECH Construction the pipe below. n — Ben Eberle, T.W. Frierson Contractor Inc.

W 4 | February 20, 2012

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BURNS MCDONNEL


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Water/Wastewater I

Northwest Arkansas Gains Regional Wastewater Treatment Facility A state-of-the-art wastewater treatment facility design project, which began in 2004, concluded last summer with the dedication of the wastewater conveyance system and treatment plant for the Northwest Arkansas Conservation Authority (NACA). The project is the first step in NACA’s plan to ultimately provide regional wastewater utility services to its 10 member cities.

The facility provides a 4-MGD initial capacity with the ability to be readily expanded to 6 MGD and ultimately to as much as 80 MGD, as well as a conveyance system connecting to customer city-collection systems.

The $37-million facility incorporates multiple processes for nutrient removal, providing some of the lowest effluent phosphorus levels in the U.S., according to Steve Yonker, Burns & McDonnell project manager. Burns & McDonnell provided project planning and engineering for the regional wastewater treatment plant and USI Consulting Engineers was responsible for planning and design of the conveyance facilities. Treatment processes include influent pumping, fine screens, vortex grit removal, an activated sludge process designed for ammonia reduction and nitrogen and phosphorus removal, filtration, ultraviolet (UV) disinfection and post aeration. Biological treatment process solids are thickened and dewatered by a triple belt filter press. “The three-step activated sludge treatment process with anaerobic, anoxic and aerobic zones removes most of the ammonia, nitrogen and phosphorus,” says Yonker. “To that we added an advanced, two-stage filtration process coupled with chemical addition to achieve very low levels of effluent phosphorus capable of meeting the facility’s 0.1 mg/l standard.” The advanced filtration produces higher quality effluent and increases the effectiveness of the ultraviolet-light disinfection process that destroys pathogens in the wastewater before it is discharged into Osage Creek. The advanced filtration phosphorus-removal system added about $4 million to the plant’s costs but the project stayed within its original budget. n

ALL CRANE

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Water/Wastewater I

Innovative Products Drive Solution For Pipeline Success Shear forces, differential settlement, seismic activity, thermal expansion and contraction, all make pipeline design and construction challenging. To reduce such difficulties, EBAA Iron created the Force Balanced FLEXTEND ® flexible expansion joint, which eliminates the need for thrust blocks and/or rodding and simplifies pipehanger and support apparatuses and designs. “The standard FLEX-TEND solves the problem of protecting piping systems at shear planes and in many different soil conditions, but produces an expansion thrust force that must be accommodated for in the pipeline design,” says Karl Miersemann, product support manager with EBAA Iron. “What makes this Force Balanced FLEX-TEND unique is the balance chamber.”

An Engineered Solution The internal pipeline pressure creates an expansion force within the FLEXTEND, as well as the adjacent fitting and pipe joints. These forces of axial expansion typically require the use of thrust blocks to contain the hydraulic forces. Above-ground designs (as shown in the photo) must also accommodate these thrust forces, but engineers are challenged to hold these significant forces with the use of hangers, supports and guides, in order to alleviate lateral and vertical movement of the pipe joints. Miersemann says that the Force Balanced FLEX-TEND gives designers a new option for absorbing the forces on piping systems that occur from seismic events, differential settlement, structural shear planes and various other conditions. Eliminating the force imparted by hydrostatic pressure on

This 8-in. Force Balanced FLEXTEND® on a Burlingame, Calif. bridge crossing uses internal hydrostatic pressure by means of a piston. This neutralizes the expansion forces that could cause the unit to expand and deflect independently of the forces it was designed to alleviate. the flexible expansion joint, allows the designer and installers to focus on the issues that precipitate the need for the flexible expansion joint in the first place. n

ISCO INDUSTRIES

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February 20, 2012 | W 7


CONTECH CON


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Water/Wastewater I

Lift-Planning Helps Ensure Safety and Efficiency The city of Lakewood, Ohio recently used federal economic According to Marty LaCava, the ALL sales representative, stimulus funds to make improvements to the sludgethis application is available on every on-board crane computer handling equipment at their Lakewood in the ALL fleet. “With the increased Wastewater Treatment Plant. The ability to calculate and view every upgrades allow for a two-stage detail, ALL’s lift-planning experts can mesophilic/thermophilic digestion find the most economical crane and process, but this improvement rigging configurations for a specific necessitated new floating covers for the pick, plan around jobsite obstructions plant’s secondary digester tanks. and view the site from all angles,” To lift and place the lids, which LaCava says. Due to the tight area on weighed over 50,000 lbs., heavy this project, the crane needed an exact equipment expert ALL Erection & pick radius of 70 ft and a swing radius Crane Rental Corp. of Cleveland, Ohio, of 18 ft 3 in. The actual swing radius recommended a Grove GMK5240 240had to be within 3 ft of the plan. In ton all-terrain crane. One challenge was addition, the ground had to be slightly that the job site was extremely tight and altered to allow for the pads and required positioning of the crane directly outriggers. between the tanks. Using ALL’s 3D Lift The lids, which were built on the Plan, an Internet-based application, lift ground, were picked one at a time and On-board computers, equipped with 3D planners visualized and simulated the set in place. “Lift-planning improves Lift Plan, determined the exact weight of the domed lid plus the weight of the rigentire lift—from the placement of the lift safety by improving foresight and ging block—a total of 60,270 lbs. per lid. crane to the exact weight of the load. real-time lift accuracy,” LaCava says. n

FLATIRON

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February 20, 2012 | W 9

ENR Water - 2-20-12  

Water/Wastewater I By Linda Mastaglio The four-phase Wichita Aquifer storage and recovery program wil provide water supply for the Wichita,...