San Diego has launched a yearlong test of a new local source of water for the semi-arid city. The Advanced Water Purification Facility is a small-scale, state-of-the-art water purification facility that purifies 3800 m3/d (1 mgd) of recycled water to distilled water quality.
All wastewater in San Diego undergoes treatment making it safe enough to be discharged into the ocean. Then, some is diverted to the city’s recycled water facilities, where it is further treated and then used for irrigation and industrial purposes. A portion of the recycled water produced at the North City Water Reclamation Plant will be sent to the Advanced Water Purification Facility.
The recycled water undergoes a multi-barrier purification process, which includes membrane filtration, reverse osmosis, and advanced oxidation with ultraviolet disinfection and high-strength hydrogen peroxide.
The facility is one component of the city’s Water Purification Demonstration Project that is examining the safety and cost of purifying recycled water. If this project is approved to go full-scale, a much larger project would produce purified water to blend with the city’s imported supplies at San Vicente Reservoir to become part of the city’s drinking water supply.
During the yearlong test phase, purified water will not be sent to San Vicente Reservoir or the city’s drinking water system; instead, the purified water will be added to the city’s recycled water system.
In July, the San Francisco Public Utilities Commission (SFPUC) dedicated its state-of-the-art Tesla Water Treatment Facility. With a capacity of treating 1.19 million m3/d (315 mgd), this new $114 million ultraviolet water treatment facility is the largest in California and the third largest in North America.
This project is part of SFPUC’s $4.6 billion Water System Improvement Program, which is comprised of 86 projects to repair, replace, and retrofit aging pipelines, tunnels, reservoirs, and other water delivery facilities within the Hetch Hetchy Regional Water System.
PCL Civil Constructors Inc. (Denver) and Stantec (Edmonton, Alberta, Canada) worked on the project.
Torrent Power Ltd. (Ahmedabad, India) has chosen Siemens Water Technologies to provide a water treatment system for its 382.5-MW Unosugen power plant in Surat, district Gujarat, India. Siemens will supply two Contrafast Concentric systems, which will treat water from the Tapi River and produce up to 15,140 m3/d (4 mgd) of cooling tower makeup water.
The water treatment system is a high-rate clarification and thickening process that consists of a solids contact reaction chamber, clarifier with tube settler, and gravity thickener in a single tank. The entire process is contained in a single, unitized steel basin, and is designed to simplify installation time and reduce cost. The design allows up to an 80% reduction in footprint compared to conventional clarification systems, and the process enhances suspended solids’ removal, lime softening, and heavy metals removal.
The system, which is part of a capacity expansion at the power plant, is scheduled to be commissioned in September 2012.
The largest polymer lining drinking water project to be undertaken in Australia has been completed by ITS Trenchless (Sydney), an official Australian partner of Swagelining Limited (Glasglow, Scotland). The pipeline rehabilitation project involved lining 4630 m of existing 600-mm (24-in.) diameter water main, which runs beneath one of the busiest roads in Adelaide. The project used a 594-mm polyethylene liner with a wall thickness of 56 mm to meet the client’s requirement for a liner with full structural capability.
The $4-million contract was the second project to be carried out for South Australia’s water utility corporation, SA Water, following a similar project in Adelaide in 2007.
David Jaensch, asset manager for SA Water, said in a press release that using the trenchless technology “resulted in a significant reduction in the impact on the community and environment with only small sections of the road having to be closed for a short space of time to be dug up,” adding, “We also benefited from substantial cost savings with regard to road restorations compared with open trenching methods.”
In August, CH2M Hill (Englewood, Colo.) announced that it has been awarded engineering, design, and owner representative services by the West Basin Municipal Water District (Carson, Calif.) for the Carson Regional Water Reclamation Facility Phase II Expansion Project.
The expansion project will allow for the City of Los Angeles and the district to provide more than 16 million m3 (13,000 ac-ft) per year of recycled water to industrial users in the Los Angeles Harbor area, helping the city make the most of its limited water resources.
The Phase II project will expand the existing 22,700-m3/d (6-mgd) plant by adding 45,400 m3/d (12 mgd) of biological nitrification processes with the potential of an additional 19,000 m3/d (5 mgd) in the future.
The Metropolitan St. Louis Sewer District (MSD) in August announced a deal with the U.S. Environmental Protection Agency and U.S. Department of Justice to make extensive improvements to its sewer systems and treatment plants, at an estimated cost of $4.7 billion over 23 years. This investment is intended to eliminate illegal overflows of untreated wastewater, including basement backups, and to reduce pollution levels in urban rivers and streams.
The deal settles a June 2007 lawsuit against MSD regarding wastewater overflows. The deal includes a variety of pollution controls, including the construction of three large storage tunnels between 3 and 14 km (2 and 9 mi) long; expanded capacity at two treatment plants; development and implementation of a comprehensive plan to eliminate more than 200 illegal discharge points within MSD’s sanitary sewer system; and comprehensive and proactive cleaning, maintenance, and emergency response programs.
The deal also requires MSD to invest at least $100 million in an innovative green infrastructure program. Green infrastructure involves the use of properties to store, infiltrate, and evaporate stormwater to prevent it from getting into the combined sewer system. Examples of potential green infrastructure projects include green roofs, bioretention, green streets, rain barrels, rain gardens, and permeable pavement.
Parsons (Pasadena, Calif.), in a joint venture with AECOM (Los Angeles), announced in July that it has been awarded a contract by the San Francisco Public Utilities Commission (SFPUC) to provide program management services for the estimated $7 billion San Francisco Sewer System Improvement Program. Parsons and AECOM will work with SFPUC to bring to fruition an upgraded, reliable, and functional sewer system in compliance with regulatory agencies — and using sustainable operations.
Under this 15-year contract, Parsons and AECOM will work on multiple projects throughout San Francisco. Parsons’ scope of work includes program planning and administration, implementation, technical support, program controls, and preconstruction management and planning.
The world’s largest solar thermal power plant, which is located in Gila Bend, Ariz., has selected Crown Solutions (Vandalia, Ohio), a Veolia Water Solutions & Technologies company, to supply an integrated, near-zero liquid discharge, water treatment system.
The solar plant consists of two 140-MW steam generator/turbine/generator units supplied with heat from a 730-ha (1800-ac) solar collector field. Unique to the plant is a large thermal storage system that enables it to continue to generate power for up to 6 hours after sundown.
The water treatment process consists of a 17,000-L/min (4500-gal/min) integrated well water and wastewater recovery system, including the patented ACTIFLO® process for softening. The overall system recovery will be in excess of 95%.
Pacific Water Treatment Engineering Co. (Nantong, China) selected PURON® membrane modules for a new city wastewater treatment facility in Zhangjiagang, China. The membrane modules, manufactured by Koch Membrane Systems (Wilmington, Mass.), are designed to handle an annual average flow of 25,000 m3/d, with peaks of up to 36,000 m3/d. The system will help meet stringent local discharge standards in Zhangjiagang, in Jiangsu Province, about 150 km northwest of Shanghai.
Startup is scheduled for early 2012.
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