Page 22 - TN Public Works Nov-Dec 2014 Vol. 32 No. 5
P. 22
by brett Ward
MUD Rehab Yields Savings
The 2013 sewer main rehabilitation the average flow is now 0.17 MGD. This is ing about the low energy usage at the
project performed by the Metro Utility a 40% reduction in average daily flow. main lift station. Before construction,
Department (M.U.D.) of Metropolitan The original sewer main was construct- the average energy bills had ranged from
Lynchburg/Moore County has reduced av- ed along traverses, and it sometimes runs $1300-$1500 per month with some go-
erage flow to the treatment plant by 40% directly within East Fork Mulberry Creek. ing as high as $2400. During and after
and resulted in approximately $24,000 As construction progressed, Plant Opera- construction, the bill had dropped as low
savings in cash expenses. Manager Rick tor Ricky Malone began to notice the flow as $500 per month. Because the sewage is
Garland enthusiastically states, “This was to the plant was dropping. The severity pumped two times, once at the main lift
a good project overall that got to the root of the groundwater problem also caused station and a second time at the plant,
of the problem.” problems for the contractor, Hawkins the electrical savings should be doubled.
& Price. Their workers had to pump Add to this savings a reduction in the
Major Reduction in Average water from the ditch from the first day of disinfection and dechlorination chemi-
Daily Flow construction. This was especially true in cals used at the plant, and the estimated
The $1.1 million project included areas where the lines exceeded a depth of annual cash savings is $24,000.
7,500' of 12" sewer main replacement and 10 feet. The new line was relocated, where “This savings will go a long way toward
manhole replacement. Most of the dete- possible, out of the creek bed and as far funding this project and the plant up-
riorated pipeline was replaced with PVC from the creek as possible. Several creek grade,” said Garland. Though the loans
pipe, but there were small areas where crossings were also eliminated during the are not fully closed, it is estimated that
cured-in-place was chosen to eliminate project. Even before construction was this savings will cover about one half of
digging. The existing main was 45 years completed, it became evident that the old the loan payments.
old and was a major source of ground line had been a major conduit of ground- Everyone involved, including plant
water infiltration. Peak flows through water and creek water. operators, management, and the design
the plant were often twice plant capacity, engineer, agreed that the strategy of
and the average flow was just under the An Unusual Call beginning with the collection and then
design flow of 0.3 MGD. Starting with the An unusual event occurred last fall. moving to the plant is the wisest ap-
month of construction through July 2014, The local electric company called inquir- proach.
Metro Utility
Department
Staff sharing a
group laugh.
22 TPW November/December 2014
MUD Rehab Yields Savings
The 2013 sewer main rehabilitation the average flow is now 0.17 MGD. This is ing about the low energy usage at the
project performed by the Metro Utility a 40% reduction in average daily flow. main lift station. Before construction,
Department (M.U.D.) of Metropolitan The original sewer main was construct- the average energy bills had ranged from
Lynchburg/Moore County has reduced av- ed along traverses, and it sometimes runs $1300-$1500 per month with some go-
erage flow to the treatment plant by 40% directly within East Fork Mulberry Creek. ing as high as $2400. During and after
and resulted in approximately $24,000 As construction progressed, Plant Opera- construction, the bill had dropped as low
savings in cash expenses. Manager Rick tor Ricky Malone began to notice the flow as $500 per month. Because the sewage is
Garland enthusiastically states, “This was to the plant was dropping. The severity pumped two times, once at the main lift
a good project overall that got to the root of the groundwater problem also caused station and a second time at the plant,
of the problem.” problems for the contractor, Hawkins the electrical savings should be doubled.
& Price. Their workers had to pump Add to this savings a reduction in the
Major Reduction in Average water from the ditch from the first day of disinfection and dechlorination chemi-
Daily Flow construction. This was especially true in cals used at the plant, and the estimated
The $1.1 million project included areas where the lines exceeded a depth of annual cash savings is $24,000.
7,500' of 12" sewer main replacement and 10 feet. The new line was relocated, where “This savings will go a long way toward
manhole replacement. Most of the dete- possible, out of the creek bed and as far funding this project and the plant up-
riorated pipeline was replaced with PVC from the creek as possible. Several creek grade,” said Garland. Though the loans
pipe, but there were small areas where crossings were also eliminated during the are not fully closed, it is estimated that
cured-in-place was chosen to eliminate project. Even before construction was this savings will cover about one half of
digging. The existing main was 45 years completed, it became evident that the old the loan payments.
old and was a major source of ground line had been a major conduit of ground- Everyone involved, including plant
water infiltration. Peak flows through water and creek water. operators, management, and the design
the plant were often twice plant capacity, engineer, agreed that the strategy of
and the average flow was just under the An Unusual Call beginning with the collection and then
design flow of 0.3 MGD. Starting with the An unusual event occurred last fall. moving to the plant is the wisest ap-
month of construction through July 2014, The local electric company called inquir- proach.
Metro Utility
Department
Staff sharing a
group laugh.
22 TPW November/December 2014
