Page 23 - TN Public Works Nov-Dec 2014 Vol. 32 No. 5
P. 23
No Need for New Permit
The MUD treatment plant consists of
two “Can-Tex” style above-ground activat-
ed sludge treatment processes. The original
plant was built in 1969 and is showing
its age. The adjoining new plant, built in
1984, also needs heavy maintenance, but
both sides were needed to effectively treat
the high flows. Because of the significant
drop in flow, the condition of the old plant
is of less concern because the new side can
easily handle the expected flow. Design
Engineer Bryant Griffin of Goodwyn, Mills
& Cawood says, in addition to the financial
savings, an important benefit of the project
is that the flow reductions indicate there
will be no need to negotiate with TDEC
about a higher capacity NPDES permit for The rehabilitation project began in the summer of 2103. The post project average flow dropped from 0.29
the upcoming plant upgrade. The existing MGD to 0.17 MGD. Rainfall for the full time has averaged five inches per month though there was far more
permit capacity will fully serve the com- variation before the rehabilitation project
munity.
managers knew the main sewer line was tion projects I have ever seen. Metro Utility
Doing It the Right Way a major source of the infiltration and Department completed a 2013 I/I reduction
Garland stated that the department inflow, so this was the place to start. Now project late last year, but they were seeing re-
is working toward reducing debt and the needed plant upgrade can be more duced flow to their plant almost from the first
ultimately making cash purchases of economical for customers. day of the project. The real attention getting
item is that their electricity provider called
major capital items. Instead of enlarging Publisher’s Note: With his permission, I them asking why electrical usage was down.
the treatment plant to handle current share MTAS Utility Operations Consultant It also highlights the strategy so rarely seen of
flow, the department chose the “right way Brett Ward’s additional comments to me when reducing the I/I before a plant expansion so
to go” for customers and addressed the he submitted his article below for publication: the expansion is for just the sewage and not
source of infiltration. The department “This is one of the most dramatic I/I reduc- for sewage and rainwater.”
Environment and Infrastructure, Inc.
Water Resource and Environmental Municipal Utilities
Management, Planning and Civil Engineering
Compliance
Roadway Planning and Design Construction Engineering,
Inspection & Materials Testing
3800 Ezell Rd., Ste. 100 9725 Cogdill Road
Nashville, TN 37211 Knoxville, TN 37932
615-333-0630 865-671-6774
TPW November/December 2014 23
The MUD treatment plant consists of
two “Can-Tex” style above-ground activat-
ed sludge treatment processes. The original
plant was built in 1969 and is showing
its age. The adjoining new plant, built in
1984, also needs heavy maintenance, but
both sides were needed to effectively treat
the high flows. Because of the significant
drop in flow, the condition of the old plant
is of less concern because the new side can
easily handle the expected flow. Design
Engineer Bryant Griffin of Goodwyn, Mills
& Cawood says, in addition to the financial
savings, an important benefit of the project
is that the flow reductions indicate there
will be no need to negotiate with TDEC
about a higher capacity NPDES permit for The rehabilitation project began in the summer of 2103. The post project average flow dropped from 0.29
the upcoming plant upgrade. The existing MGD to 0.17 MGD. Rainfall for the full time has averaged five inches per month though there was far more
permit capacity will fully serve the com- variation before the rehabilitation project
munity.
managers knew the main sewer line was tion projects I have ever seen. Metro Utility
Doing It the Right Way a major source of the infiltration and Department completed a 2013 I/I reduction
Garland stated that the department inflow, so this was the place to start. Now project late last year, but they were seeing re-
is working toward reducing debt and the needed plant upgrade can be more duced flow to their plant almost from the first
ultimately making cash purchases of economical for customers. day of the project. The real attention getting
item is that their electricity provider called
major capital items. Instead of enlarging Publisher’s Note: With his permission, I them asking why electrical usage was down.
the treatment plant to handle current share MTAS Utility Operations Consultant It also highlights the strategy so rarely seen of
flow, the department chose the “right way Brett Ward’s additional comments to me when reducing the I/I before a plant expansion so
to go” for customers and addressed the he submitted his article below for publication: the expansion is for just the sewage and not
source of infiltration. The department “This is one of the most dramatic I/I reduc- for sewage and rainwater.”
Environment and Infrastructure, Inc.
Water Resource and Environmental Municipal Utilities
Management, Planning and Civil Engineering
Compliance
Roadway Planning and Design Construction Engineering,
Inspection & Materials Testing
3800 Ezell Rd., Ste. 100 9725 Cogdill Road
Nashville, TN 37211 Knoxville, TN 37932
615-333-0630 865-671-6774
TPW November/December 2014 23
