In an ongoing effort to clean up the Willamette River, the city of Portland, Ore., authorized construction of three new shafts as part of the East Side Tunnel Combined Sewer Overflow project. The goal is to reduce water and sediment pollution, improve watershed health, and restore habitat for endangered salmon and steelhead.
Doka USA Ltd. (Little Ferry, N.J.), a supplier of formwork solutions, worked closely with the project contractor, Kiewit Bilfinger–Berger (Portland), to devise a sequencing plan that not only makes each lift easier to climb but also allows construction workers the ease of moving panels with a consistent final-finish pattern from the bottom of the shaft upward to ground surface within approximately 10 casting steps.
To accommodate multiple pours at different heights, the project used approximately 40 cantilever dam brackets with spindle struts on the bottom slab as starter blocks and nearly 200 m3 (2100 ft2) of clamp-style panels in a chorded radius geometry.
When completed, this project is expected to achieve a 94% reduction in the volume of combined wastewater and stormwater that now overflows to the river when it rains. It also is hoped that the project will eliminate most combined sewer overflows into the river.
Through a public–private partnership, the Hampton Roads Sanitation District (HRSD; Virginia Beach, Va.) and Ostara Nutrient Recovery Technologies Inc. (Vancouver, British Columbia) in May officially unveiled the first Pearl® Nutrient Recovery Process facility in the Chesapeake Bay watershed. This process recovers nutrients, including phosphorus and nitrogen, from wastewater and transforms them into an environmentally friendly commercial fertilizer. The process, installed at the 114,000-m3/d (30-mgd) Nansemond Treatment Plant in Suffolk, Va., enhances HRSD’s efforts to remove excess nutrients from wastewater.
This full-scale installation was preceded by a pilot-scale installation that was tested from October 2006 to March 2007. During the pilot-testing, the system recovered more than 85% of the phosphorus and 40% of the ammonia from the liquid it processed, according to a company press release.
The City of Newton, Mass., has selected the evolution™ fixed network advanced metering infrastructure solution from Elster (Ocala, Fla.) for a systemwide meter-replacement program. The program also includes the installation of Elster evoQ4 solid-state meters.
The automated, wireless, two-way smart metering system will enable Newton to obtain on-demand readings, real-time leak detection, and tampering and backflow notification. In addition, the utility expects to benefit from reduced costs, improved customer service, and water consumption monitoring.
The Victorian Desalination Project in Melbourne, Victoria, Australia, has awarded Nitto Denko/Hydranautics (Oceanside, Calif.) a contract to use SWC6 MAX and ESPA2+ desalination elements. The project, currently under construction on Australia’s Bass Coast near the town of Wonthaggi, is being delivered as a public–private partnership. The contract was awarded by Thiess Degrémont (South Bank, Queensland, Australia), the project’s design and construction contractor.
When operational, the plant will have a capacity of 440,000 m3/d and supply an estimated 150 billion L of water per year to Melbourne, Geelong, South Gippsland, and Western Port towns, all in Victoria. The project is due to be complete in December 2011.
The U.S. Environmental Protection Agency on June 2 announced that it will award $291,000 to Boone, Iowa, to fund the final phase of a sanitary-sewer replacement project. This project will address residential sewer backups that occur during moderate to heavy rainfall by replacing undersized sanitary-sewer pipe with larger-diameter pipe.
The U.S. National Institute of Standards and Technology awarded a grant to LMK Enterprises Inc. (Ottawa, Ill.) to work on the development of an advanced trenchless technology to rehabilitate potable water pipes without the need for excavation and replacement.
This technology involves dynamic resin-injection, molded-in-place pipe and proposes to utilize recent advances in nanomaterials. Specifically, an instantaneous rapid-curing resin is subjected to compression between the host pipe and an inflated bladder, eliminating the need for a custom-tailored liner tube and correcting sagging issues associated with spraying or spin-casting uncured materials to the interior of a pipe.
The project’s tasks include materials characterization, design and development of a temporary prototype, testing the temporary prototype, designing and building a full-fledged prototype system, laboratory testing of the prototype, and field-testing of the prototype.
The City of Buffalo, N.Y., selected Veolia Water North America (Chicago) to manage and operate its water system under a 10-year public–private partnership that will serve approximately 280,000 people. Valued at approximately $53 million, the contract includes managing, operating, and maintaining the city’s water treatment facilities and distribution system, and managing approximately 117 city employees. n
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