Illinois’ Largest TOTAL WATER Conference
March 19th - 22nd, 2018
Crowne Plaza Springfield, Illinois
It’s All About the Water and YOU
Attendees will benefit from innovative industry programs,
products and services, education and networking
opportunities designed to facilitate new business partnerships.
For more information, go to www.watercon.info
American Water Works Association
SALUTING THOSE WHO SERVE
Circle 128 on Card or http://pen.hotims.com/69825-128
For Improved Adherence To Water Quality Regulations
For Small and Medium Treatment Plants
EXAMPLES OF AIR STRIPPING IN ACTION
QED’s sliding tray air stripper, the E-Z Tray, was the first self-contained air
stripper to achieve certification from NSF International to NSF/ANSI Standard
61: Drinking Water System Components – Health Effects. This particular design of air stripper has been employed in a variety of drinking water treatment
facilities to address the issues described above at a low cost and with minimal
impact to the facilities.
One such example is the U.S. Army Corps of Engineers – Omaha Dis-trict-funded design and construction of a new groundwater treatment plant in
Cheyenne, Wyoming. This plant was designed to treat groundwater from the
city’s Borie well field, an important groundwater supply that was contaminated with a chlorinated VOC in the late 1960s at the former F.E. Warren Atlas
Missile Site 4. In this application, a total of four, 6-level tray QED E-Z Trays,
each with a treatment capacity of 1,000 gpm, were used in the plant design to
insure that the TCE treatment goal of less than non-detection could be reached.
The E-Z Tray units chosen for the Cheyenne treatment facility have more than
enough capacity to handle the city water’s contamination load, with capacity
to spare should any changes to the water’s contamination levels occur, and the
plant operators have encountered no issues so far.
Another successful implementation of the E-Z Tray air strippers is in place at
the Cedarburg, Wisconsin Light and Water Utility water treatment plant. The
Cedarburg Water Utility installed a QED E-Z Tray Air Stripper to their existing
production pump building. The E-Z Tray 72.6 handles a flow rate of 600 gpm
and treats groundwater containing a chlorinated VOC traced back to a nearby
landfill. The air stripper is meeting the goal of complete removal.
Cedarburg had been using a packed tower air stripper for 18 years to treat TCE
at a different supply well location, but when the new contamination needed to
be addressed, the plant operators began researching alternatives, as they had
encountered issues with the tower
at the other location. In addition,
the plant in question is adjacent to a
residential neighborhood and so the
aesthetics of a tower would have been
an issue. The E-Z Tray system was
not only competitively priced and
offered simpler maintenance, it also
could be discreetly housed indoors.
Finally, QED supplied an E-Z Tray
system to the City of Santa Cruz, CA for THM reduction in groundwater that
had been partially recharged with treated, reused wastewater. The system
was installed in late 2015 and has resulted in consistent THM reductions of
78-98%, with the system’s treatment cost per gallon far lower than alternative
Air stripping technology has proven to be an effective process not just for
groundwater remediation, as it has been used in the past, but also for the
treatment of both groundwater and surface water sources of drinking water.
Air stripping effectively removes VOCs, including DBPs such as THMs from
chlorine disinfection, and dissolved gases like CO2 in the case of overly acidic
water sources. In doing so, it reduces treatment costs over competing treatment
options and ensures adherence to regulations. It is therefore an ideal treatment
option for these sources of contamination in small and medium-sized drinking
water treatment plants.
By Dave Fischer, Vice President of Technology and Product Manager for Treatment
Equipment, QED Environmental Systems, Inc.
Continued from page 25