|
| ||
|
 |
|
|
 |
 |
 |
 |
 |
 |
 |
|
 |
||||||||
|
|
 |
 Case Study: Calgon Carbon Corp. - ISEP(R) Continuous Ion ExchangeLos Angeles, CASource: Calgon Carbon Corporation Press Release - December 7, 1998, available at www.findarticles.com. Sase, Richard K., 2000. "Perchlorate Treatment Technology Fast Track to a Solution" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas. Wagner, Norman, and Charles Drewry, 2000. "Commercial Systems Treating both High and Low Strength Perchlorate Applications Utilizing Ion Exchange" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas Project Summary: The following text was excerpted from Calgon Carbon Corporation Press Release - December 7, 1998, available at www.findarticles.com; Sase, Richard K., 2000. "Perchlorate Treatment Technology Fast Track to a Solution" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas; and, Wagner, Norman, and Charles Drewry, 2000. "Commercial Systems Treating both High and Low Strength Perchlorate Applications Utilizing Ion Exchange" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas: The Main San Gabriel Basin Watermaster (Watermaster) manages the drinking water supplies within the Main San Gabriel Basin, a 167 square mile basin area drained by the San Gabriel River. The basin is located east of Los Angeles, in Los Angeles County, California, and meets 80-90% of the Valley's water demand, for over one million people. The Main San Gabriel Basin is designated as a Superfund site due to VOC contamination from use of industrial solvents and chemicals; four areas within the Basin are named as Superfund Sites. Perchlorate was discovered in groundwater in the Basin in May 1997, leading to the shutdown of eight public drinking water wells. Four of the wells were shutdown, groundwater from another two wells was "blended", and two wells were inactivated due to other contaminants. A four-pronged approach was taken to fast-track development of a perchlorate treatment technology for the Main San Gabriel Basin. In October, 1997, the San Gabriel Perchlorate Coordinating Team was formed, and in June 1998 a screening study by California Polytechnical Institute, Pomona was sponsored. An ion exchange study by Montgomery Watson was sponsored in February 1999, and a joint study was undertaken with Calgon Carbon Corporation in October 1998. The San Gabriel Perchlorate Coordinating Team consists of local and regional water agencies, regional, state, and federal regulatory agencies, potentially responsible parties (PRPs), and highly-specialized technical consultants, and was formed to share information, pool research resources, and to fast-track the peer and regulatory review process. The screening study by California Polytechnical Institute investigated various biological, chemical, and physical treatment methods. Their main findings on biological treatment were that: 1. pilot studies indicated perchlorate is destroyed, so that no wastestreams are produced; 2. the addition of microorganisms and disinfection products were concerns; 3. regulatory approval (for drinking water treatment) could be time consuming; and, 4. additional studies should be conducted. The California Polytechnical Institute study made the following main conclusions for physical treatment: 1. ion exchange was the most promising alternative; 2. The Calgon Carbon Corporation ISEP TM treatment system resulted in low waste brine (<1%); 3. ion exchange technology is currently used in public drinking water systems; and, 4. waste brine disposal may become a problem in the future. The main conclusions on biological treatment by the California Polytechnical Institute study were: 1. reverse osmosis (RO) was a proven technology that should remove perchlorate; 2. a large volume of waste brine (10-30%) could be produced; and 3. disposal of the waste brine was a major concern. Montgomery Watson undertook bench/pilot-scale tests of anion exchange technology, testing commercially available strong-base resins. Perchlorate concentrations in the bench-scale influent were 200 ug/L, and in the pilot-scale influent were 90 ug/L. Treated effluent perchlorate concentrations at both bench- and pilot-scale were non detectable. It was found that polystyrene resins were very difficult to regenerate, and that polyacrylic resins treated 725 bed volumes before breakthrough, and were then fully regenerated. The Watermaster solicited engineers, contractors, suppliers, and manufacturers to participate in a joint venture, where Watermaster would provide the site and source water, and the joint venture partner would provide a "black box" treatment plant. The only proposal for this joint venture that was accepted was that for the Calgon Carbon Corporation ISEP TM treatment process. The pilot testing was performed on the Big Dalton Well, Baldwin Park, California. The flow rate to the pilot ISEP TM system was 4.28 gpm; brine produced was 0.75% of the inflow. The influent perchlorate concentration of 18-76 ppb, was treated to an effluent concentration of <4 ppb. Based on these results, Calgon Carbon Corporation was retained to construct a full-scale ISEP TM treatment plant for the La Puente Valley County Water District. Construction was completed in March 2000, and the plant was tested from February 10 to March 12, 2000. Reliability and ease of operation were proven in subsequent, intermittent operations, and the waste brine produced is 0.85% of the inflow. Calgon Carbon Corporation conducted the first laboratory tests of the ISEP® and ISEP++® systems in January 1998. Calgon Carbon Corporation announced on December 7, 1998, that it had successfully completed field trials for the removal of perchlorate from groundwater in California's San Gabriel Valley utilizing an ISEP® continuous ion exchange system which was designed and manufactured by Advanced Separation Technologies, a subsidiary of Calgon Carbon. Perchlorate is often present in groundwater where rocket fuels, fireworks, and explosives have been manufactured. The month-long trial, which was supported by the Main San Gabriel Basin Watermaster and conducted at the Big Dalton well site, demonstrated ISEP®'s capability to exceed requirements by reducing perchlorate concentration in the groundwater on a continuous, ongoing basis to below California's Provisional Action Level of 18 parts per billion (ppb). A summary of the results was presented to the Watermaster. The data show that the ISEP® system exceeded requirements, consistently reducing perchlorate concentration in the groundwater from influent levels of 18-76 ppb to below the detection level limit of 4 ppb at a 4.28 gpm flow rate. The results also demonstrate that the ISEP® reduced the concentration of nitrate in the groundwater by about 60%. These results confirm the capability of the ISEP® to reliably, consistently, and economically remove small amounts of perchlorate in contaminated water and to concurrently reduce the concentrations of other ionic contaminants such as nitrate and sulfate to insignificant levels. Calgon Carbon Corporation produces, supplies and designs products, services, and technologies for the purification, separation, and concentration of liquids and gases. Advanced Separation Technologies Incorporated, based in Lakeland, Florida, is a worldwide supplier of the patented ISEP® Continuous Contactor for ion exchange, chromatography, and adsorption. Additional Info Source: Calgon Carbon Corporation Press Release - December 7, 1998, available at www.findarticles.com. Sase, Richard K., 2000. "Perchlorate Treatment Technology Fast Track to a Solution" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas. Wagner, Norman, and Charles Drewry, 2000. "Commercial Systems Treating both High and Low Strength Perchlorate Applications Utilizing Ion Exchange" in Perchlorate Treatment Technology Workshop, 5th Annual Joint Services Pollution Prevention & Hazardous Waste Management Conference & Exhibition, August 21-24, 2000, Henry B. Gonzalez Convention Center, San Antonio, Texas < Back |
 |
|
||||||||||||||||||||
|
|||||||||||||||||||||||||
About Perchlorate | Recent Cases Involving Perchlorate | Perchlorate News and Notes | Related Links About Perchlorate and Treatment | Contact Perchlorate News Ground-Water Remediation Technologies Analysis Center ©2001 GWRTAC The Perchlorate News Web Site is brought to you by: Calgon Carbon Corporation, 400 Calgon Carbon Drive, Pittsburgh, PA 15205. Phone: (412) 787-6700, 1-800-422-7266 Use of this site signifies your acceptance of Calgon Carbon Corporation's Website Terms and Conditions and Privacy Policy. © 2003 Calgon Carbon Corporation. All Rights Reserved. |
