May 2012, Vol. 24, No.5

Projects

The Tuy System IV in Caracas, Venezuela, the world’s largest hydraulic project, has selected gearboxes manufactured by AUMA (Muellheim, Germany). The GS 630.3 gearbox selected for the contract is a highly specialized product designed to operate valves with a torque requirement up to 671,000 J (495,000 ft-lb). Built to order, the gearboxes are installed in major water installations worldwide, including giant subterranean aquifers in the Sahara desert and large-scale water supply projects.

The project includes an 84-m-high (275-ft-high) compacted concrete dam on the Cuira River in the state of Miranda. The pipeline will be up to 3 m (118 in.) in diameter and 72 km (45 mi) long; it will carry water to people in Caracas and the states of Miranda and Vargas. Flow rates through the pipeline will be 21,000 L/s (332,856 gal/min).

Construction startup is scheduled for June.

 

In February, the Clinton (Mass.) Wastewater Treatment Plant completed a pilot study for using chemical coagulation and disc filtration to remove total phosphorus (TP) to less than 0.1 mg/L. The 11,400-m3/d (3-mgd) plant is facing a permit change in 2014 that will require it to discharge less than 0.15 mg/L of TP from April through October and less than 1.0 mg/L between November and March.

To provide a safety margin and improve environmental quality, the plant set a treatment goal of less than 0.1 mg/L phosphorus year-round.

The pilot study tested the ability of the SuperDisc™ Disc Filter, manufactured by WesTech Engineering Inc. (Salt Lake City), to meet the new limit.

To optimize filtrate quality and chemical dose, the testing used multiple dosing rates of alum, ferric chloride, and various polymers with the disc-filter pilot study.

Results showed that with the addition of a polymer and ferric chloride, phosphorus levels were consistently below the 0.1-mg/L TP goal under all plant conditions, while operating with an efficiency between 95% and 97%.

 

The City of Villa Rica, Ga., awarded Woodard & Curran (Portland, Maine) a 7-year contract to operate the city’s water treatment facility. Villa Rica is a community of nearly 13,000 residents located about 48 km (30 mi) from Atlanta. The water treatment facility has an average daily flow of 4500 m3/d (1.2 mgd).

Under the agreement, the company will assume all responsibility for staffing, operating, and maintaining the water treatment plant. The company will retain the city’s half-dozen staff members to operate the facility, according to a Woodard & Curran press release.

The company also will oversee the identification, installation, and operation of capital upgrades over the next year.

 

In February, Plattsburg, Mo., received $364,000 from the U.S. Environmental Protection Agency for improvements to the city’s drinking water system.

The project, which is expected to cost $661,800, will increase the capacity of the water-transmission main that carries water from the water treatment plant to the distribution system. The construction will include approximately 2800 m (9200 ft) of 400-mm (16-in.) iron pipe, water valves, and fire hydrants. It will reduce numerous leaks that have recently occurred. Such leaks can cause low water pressure and introduce contaminants to the water.

The project is expected to be completed by summer 2013.

 

The Water and Sewerage Corp. (Bahamas) awarded an $83 million contract to Miya, a wholly owned subsidiary of Arison Investments (Tel Aviv, Israel). The 10-year contract will be carried out in New Providence, the most populated island in the Bahamas. It will focus on improving local water distribution utilities to substantially reduce potable water leakage, currently estimated at 50%.

Within 5 years, more than half of the current leakage will be reduced to deliver an estimated savings of more than 11,400 m3/d (3 mgd) of fresh water. These savings will be maintained during the remaining 5 years to ensure that the financial benefits of reduction are realized.

 

The Philadelphia Water Department (PWD) in February announced a partnership with Ameresco Inc. (Framingham, Mass.) to design, build, and maintain a wastewater biogas-to-energy facility. The Northeast Water Pollution Control Plant Biogas Project will generate electricity and thermal energy for use onsite and will be fueled mainly by biogas from the plant’s digesters. The $47.5 million construction project, designed to generate 5.6 MW of power, is expected to reduce PWD energy costs by more than $12 million during the course of the 16-year contract.

Ameresco will manage engineering, procurement, construction, and maintenance on the project. The project is expected to reduce carbon emissions by nearly 20,000 Mg/yr (22,000 ton/yr), equivalent to removing 4833 cars from the road or planting 2200 ha (5390 ac) of pine forest.

 

Aqua-Chem Inc. (Knoxville, Tenn.), a provider of evaporation and reverse-osmosis technologies and water pretreatment equipment, has designed, manufactured, and is in the process of installing a custom-built seawater reverse-osmosis plant off the coast of Vladivostok in the Russian Far East. The system will purify more than 9800 m3/d (2.6 mgd) of seawater to be used for drinking and process needs. The facility also will support the local residents, a university, and a conference facility.

 

MIOX Corp. (Albuquerque, N.M.) has been selected by developers of the Yas Island Water Park in Abu Dhabi, United Arab Emirates, to supply three RIO midsize onsite sodium hypochlorite generators to disinfect the park’s aquatic features. The water park will use three MIOX RIO H5 units, which will be capable of generating 680 kg/d (1500 lb/d) of free available chlorine onsite and on demand. The park is expected to be completed in early 2013.

 

El Paso (Texas) Water Utilities has implemented an interactive geographic information system map-based mobile work-management solution. Field crews are equipped with mobile computers and Fieldport® software made by Trimble® (Sunnyvale, Calif.). Crews use the software to record updates about service calls and synchronize with the customer service system from the field. Back in the office, customer service representatives have access to the updated information, which they can share with customers calling to inquire about their accounts throughout the day.

El Paso Water Utilities serves more than 200,000 commercial, industrial, and residential customer accounts in the greater El Paso metropolitan area.

 

 

The City Brewery in Latrobe, Pa., awarded a contract to the American Water (Voorhees, N.J.) Contract Services Group (O’Fallon, Mo.) to manage the startup and operations at the brewery’s wastewater pretreatment plant. The plant will pretreat up to 2.2 million L/d (590,000 gal/d) of wastewater from the brewery operations before it is discharged to the local municipal wastewater plant.

The brewery has the capability to package annually more than 20 million cases of beer, teas, and energy drinks. It is capable of packaging 12-, 16-, and 24-oz cans, as well as half barrels and sixth barrels.

 

The Cascade Water Alliance (Bellevue, Wash.) selected Veolia Water North America — West LLC (Pleasant Hill, Calif.) to operate and maintain the White River–Lake Tapps Reservoir Project in Washington state’s Central Puget Sound area. The initial goal of the project will be to enhance flows in the White River to protect and improve habitat for listed salmon species, and to support recreation at Lake Tapps. Ultimately, Lake Tapps will provide a long-term municipal water supply to meet the future needs of the Central Puget Sound region.

Under the agreement, Veolia will provide operations, maintenance, and other related services for the project. The overall project operations are geared toward maintaining specified minimum flows in the White River and keeping Lake Tapps reservoir water at established target levels throughout the year.

The initial contract is a 5-year agreement valued at more than $5 million, with two options for renewal.

 

On March 7, the new Glencorse Water Treatment Works near Edinburgh, Scotland,went into service, on schedule and under budget. The £130 million asset owned by Scottish Water (Dunfermline, Scotland) was designed and constructed by Black & Veatch (Overland Park, Kan.). Glencorse will provide about 175 million L/d to serve its customer base of 450,000 people across the city and parts of Midlothian.

Throughout planning, design, and execution, steps were taken to minimize the project’s impact. Using grass roofs for the largest structures also helped blend the works into its surroundings.

The plant’s location was chosen to ensure that water would flow by gravity from the reservoirs, through the plant, and into supply. Removing the need for pumping cut energy consumption and carbon dioxide emissions. Manufacturing 15 km of high-density polyethylene pipes onsite saved an estimated 2000 Mg of carbon dioxide when compared to importing the pipes from Scandinavia. Installation of a hydroturbine generates one-third of Glencorse’s energy needs onsite from a renewable source.

 

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