The decision on whether or not to install a $7.1 million ultraviolet disinfection system at the Littleton/Englewood Wastewater Treatment Plant is on …
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The decision on whether or not to install a $7.1 million
ultraviolet disinfection system at the Littleton/Englewood
Wastewater Treatment Plant is on hold while members of the
Englewood and Littleton city councils and staff evaluate the data
presented at a June 28 joint meeting.
The June 28 meeting was for the presentation of a second opinion
about last year’s evaluation by consultant Brown and Caldwell
recommending the UV system be installed immediately.
Littleton’s city council hired consultant CH2M HILL to do an
independent evaluation of the immediate need for a UV system.
The CH2M HILL report to the joint city council meeting stated
the plant will eventually have to install a UV system but it
doesn’t have to be done right now because the current process meets
all federal and state treatment standards.
The plant on South Platte River Drive provides wastewater
treatment for 300,000 regional customers. It is jointly owned by
the two cities so the ultimate decision to proceed with any capital
project rests with the two city councils.
Littleton Mayor Doug Clark chaired the June 28 joint council
meeting and turned it over to the two CH2M HILL representatives,
who presented their company’s evaluation of the ability of the
plant to meet the requirements established in the 2014 permit
granted by the Colorado Department of Public Health and
Paul Swaim, CH2M HILL vice president of global technology for
water treatment, said future regulations probably will mandate
installation of a UV process
However, he said based on evaluation of plant data from January
2009 until March 2011, the current system provides wastewater
treatment that meets the 2014 standards for ammonia removal and
treatment for E.coli. However, even though the current process is
very complex, there appears to be a low risk of compliance
CH2M Hill representative Larry Schimmoller, global technology
leader, water reuse, said ammonia removal is particularly complex
because, at a later treatment stage, a small amount of ammonia must
be mixed with chlorine to provide disinfection. Then another
chemical must be added to remove the chlorine before the treated
water is returned to the river.
He said while the current system meets ammonia removal limits
and requirement for treatment for E.coli, installation of UV
disinfection would create provide a less complex treatment system
and eliminates the need for chlorine use.
Both men said the UV system is effective and they reported 13 of
the 15 wastewater treatment plants in Colorado surveyed used UV
Littleton Councilmember Jim Taylor asked how long it would be
before the UV installation would be required.
“The 2014 permit will be good for five years so it is likely it
will be 15 or 20 years until UV installation will be required at
the Littleton/Englewood plant,” Swaim said.
Clark wrapped up the meeting when questions ended.
“I don’t think anyone expected a decision today since this is
the first time the Englewood people have seen this report,” he
said. “I would guess they would like take time to discuss this
information with staff and review the data.”
He said once Englewood has evaluated the report, another joint
council meeting will be scheduled to decide when a UV system should
be installed at the wastewater treatment plant.
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