Vol 33 No 4 Text - International Ozone Association

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,
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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