Vol 33 No 4 Text - International Ozone Association

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Ozone News Volume 33, No. 4 • In February 2005, EPA published a contaminant list. Of specific emphasis are: • Lead – Regulation changes to be proposed in early 2006 • Perchlorate – EPA is trying to determine whether to regulate. 26 states have found chlorate in excess of 4 ppb. • MTBE – An advisory committee recommends a maximum limit of 20-40 ppb. A draft health assessment is being completed. • Arsenic rule. This rule was promulgated in 2001 and full compliance is required in some cases in early 2006. EPA has held webcasts explaining the rule and is now conducting on-site workshops in Phoenix, Sacramento, Omaha, South Bend and Anchorage. These workshops provide information to users on technologies to remove Arsenic. A summary of the regulations and their compliance dates can be found at: www.epa.gov/safewater/regs.html Technical Sessions Industry News(cont’d) A number of technical presentations focused on ozone or related applications, a summary of which follows: J. Dan Shannon, CDM, discussed the expansion of the Fort Worth, TX Rolling Hills Water Plant from 160 to 200 mgd capacity and the installation of a raw water ozonation facility. Ozonation was selected to meet current and future regulatory requirements, reduce tastes and odors, and improve overall treated water quality. Using LOX as the feed gas, the plant achieved 4.28 kwh/lb at 10% ozone concentration. The sum of power and oxygen costs was $0.58/lb at this concentration. Ozone-enhanced biofiltration for geosmin and MIB removal was reviewed by Kerry Meyer, Carollo Engineers, and Debbie Metz, Greater Cincinnati Water Works. Pilot studies were made on the City of Boulder’s 63rd Street Water Treatment Plant and full-scale biofilter (pre GAC) tests were conducted at Cincinnati. There is increasing concern on the presence of pharmaceuticals and personal care products in drinking water. The effectiveness of treatment technologies in removing pharmaceuticals was reviewed by Shane Snyder, Page 10 Southern Nevada Water Authority. Ozone is able to remove most of the products in question; byproduct formation still requires study. UV works on several products; UV combined with hydrogen peroxide is more effective. There has been success with the combination of membranes with UV. The Southern Nevada Water Authority is also facing challenges from the upcoming Stage 2 D/DBP regulations and the declining level of Lake Mead. Disinfection byproduct control strategies for this water authority were presented by Mark Janey, CH2M Hill. One interim solution may be ozone plus biologically active filtration. Update on Ozone, UV and Drinking Water A special session titled “An update on Ozone, UV and Drinking Water was jointly conducted by the AWWA, IOA and IUVA. Craig Thompson, Kennedy/Jenks Consultants, reviewed “Thirty Years of Experience Using Ozone in Water
Ozone News Volume 33, No.4 Industry News(cont’d) Treatment in the United States”. Currently there are approximately 204 drinking water plants (>1mgd) using ozone treating 9,200 mgd water and capable of producing 340,000 lb/day ozone. By 2010, some 240 facilities are anticipated trating 13,000mgd water and producing 420,000 lb/day ozone. Within the next five years it is expected that 1/3 of the water treatment capacity will involve ozone in some form. An ozone use questionnaire is available for users to input data to update the survey at http:/kjweb1.kennedyjenks.com/ioasurvey Kerwin Rakness, Process Applications outlined the upcoming AWWA Ozone Handbook. This handbook is intended to serve as a practical reference for anyone using ozone, or planning to use ozone. More details on this handbook are outlined elsewhere in this issue. Susan Teefy, Water Quality and Technical Solutions, Inc. surveyed ozone use in the San Francisco Bay Area. Robert Hulsey, Black & Veatch outlined the combining of ozone and UV research into a full-scale design. With UV, the biggest challenge is how to measure UV effectiveness. Page 11
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