January 2011, Vol. 23, No.1

Projects

The Greater Cincinnati Water Works held a groundbreaking ceremony at the Richard Miller Treatment Plant for its new ultraviolet disinfection system in November. Once complete, it will be the sixth-largest ultraviolet disinfection drinking water facility under construction or operation in North America. The facility will use eight Calgon Carbon Sentinel® 1200-mm (48-in.) Chevron reactors. The system is scheduled to be commissioned and operational by the end of 2012.

The utility initiated this project as a nonregulatory mandated initiative to proactively improve drinking water quality and better protect the public from microbial contaminants in the Ohio River. CDM (Cambridge, Mass.), in partnership with Carollo Engineers (Phoenix), provided design and construction engineering services for the new facility.

 

At the Wawaitin Generating Station on Kenogamissi Lake, located near Timmins, Ontario, Ontario Power Generation (Toronto) is conducting a total reconstruction of its hydroelectric plant. The project includes replacing the piping system responsible for transporting approximately 40 m3/s of water through the plant, which generates 10 MW of electricity.

For this project, the designers, Kiewit–Alarie, A Partnership (Timmins, Ontario), decided to switch from concrete pipe to a type of high-density polyethylene (HDPE) pipe called Weholite. This pipe is a large-diameter piping product designed for gravity and low-pressure applications.

KWH Pipe Ltd. (Vaasa, Finland) manufactures Weholite using DOW™ DGDB-2480 NT HDPE resin, a PE3608 resin that offers such properties as stress-crack resistance, saltwater and chemical resistance, cold-temperature toughness, and thermal-extrusion-welding joining methods.

The project will use approximately 945 m (3100 ft) of 3300-mm (132-in.) inside-diameter pipe in two parallel lines, according to Paul Mongelli, a site engineer at Kiewit–Alarie.

 

The pharmaceuticals company Roche Diagnostics (Ratingen, Germany) has decided to build a new anaerobic plant for the biological preprocessing of a partial wastewater flow at its Penzberg site in Upper Bavaria. The plant, which produces energy-rich biogas, will supplement an existing membrane system. The anaerobic plant will be built by Aquantis (Ratingen), a subsidiary of Veolia Water Solutions & Technologies (St. Maurice, France).

The new system will treat wastewater flows that are especially rich in carbon and biologically degradable liquid waste. The system will use a 480-m3 Biobed® expanded granular sludge bed reactor. In the course of treatment, energy-rich biogas will be produced, collected, and processed. The gas will be used in a combined heat and power plant in the Penzberg site’s boiler house to generate both forms of energy.

Assembly of the anaerobic plant is planned for the end of March 2011, with startup in November 2011.

 

The Dannon Co. (White Plains, N.Y.) in November announced that it had selected MWH (Broomfield, Colo.) to design and build a multimillion-dollar water pretreatment system at its West Jordan, Utah, facility. The system will enable Dannon to significantly increase yogurt production capacity while limiting its effects on the community’s infrastructure in a sustainable manner.

The primary treatment processes will be a moving-bed bioreactor combined with dissolved-air flotation. The system design will include a pretreatment facility, odor-control facilities, pumping, tanks, treatment processes, and storage and will be designed to meet discharge requirements, while handling a flow of several hundred thousand gallons per day.

 

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