NC0026051_Annual Report_20240824

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Triangle Wastewater
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Treatment Plant
5926 NC Hwy. 55 E.
Durham, NC 27713
ID YOU KNOW there is a North Carolina law that mandates underground
utilities to be located before any excavation occurs?
[phone]
Damaged Pipes aNwk T-f"6 EdrmNwk :T-164�6
NC General Statute Chapter 87, Article 8A,
Permits:
requires existing facilities be identified in T_"-°°e
T-lY-9°9
Wastewater
advance of any excavation in North Carolina.
Treatment Plant:
The reason being, many utilities
NCO026051
provided to you, such as water,
sewer, cable, gas, etc. are often,
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buried underground close to the
Collection system:
surface. The law requires a notifica-
WQCS00038
tion prior to digging to NC811,
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which will alert utility owners in that
"
stormwater:
area s0 they can be located and
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NCG110054
marked prior to any digging.'
Reclaimed Water:
W00032821
Durham County Utilities has
dedicated staff that locates County
r
16
owned utilities so contractors, home
Owned and Operated'
APWA UNIFORM COLOR CODE
Durham County
Engineering
Environmental services
Utilities Division
and business owners, etc.
knowwhere to excavate safely.
GAS, OIL, STEAPT4 IF OR GASEOUS MATERIALS '' , Sometimes this is not the case,
and lines may be damaged
Contact: that can result in sanitary
Stephanie Brixey r50 sewer overflows (SSO) and
Deputy Director • • : -. costly repairs. Often, County
staff determine sewer pipes
have been affected by watching videos taken within the pipe. If the responsible party
cannot be determined, repairs are paid for by the County which may result in higher
sewer and water rates for customers.

Collection System
urham County owns and maintains a
wastewater collection system which includes
110 miles of gravity sewer, 11 miles of pres-
surized force mains, and 13 lift stations.
In the past 12 months Durham County had two
reportable sewer spills.
■ On July 26, 2023, a spill estimated at 5,000 gallons
of wastewater occurred because of a blockage in
the line.
■ September 1, 2023, a spill estimated at 180 gallons
of wastewater occurred at a step system in the
Wexford Development due to a broken discharge
line.
Durham County Utilities prides itself on providing a
high level of customer service. All commercial, indus-
trial, and residential customers' questions and concerns
are responded to in a timely manner. If you have a
question or concern regarding the collection system,
services, or any item covered in this report, please call
[phone] or send an e-mail to [e-mail].
Projects &
Rehabilitation
hroughout the last year, the County has
continued its efforts to rehabilitate aging
collection system infrastructure and
increase sanitary sewer capacity to facilitate
economic growth in our service a rea.
=> Replaced 500 linear feet of 16" DIP force main with
16" PVC on Hopson Road.
=> Lake Park Lift Station was rehabilitated.
=> Bypass connections were installed at Page Park and
Fairfield Lift Stations.
=> Six manholes were rehabilitated.
=> TWWTP BNR Train #3 - Cleaned the interior basin,
repaired the seams, replaced the flapper valves,
installed two new adjustable weirs, and four new
rotors with variable frequency drives.
Biosolids System
TWWTP generates biological residuals
(approximately 6,389 wet tons per year), which are
dewatered by centrifuges. The dewatered cake
(approximately 1,213 dry tons per year) is transport-
ed to McGill Environmental Systems, where it under-
goes further biological treatment to produce a Class
A biosolid. These biosolids are beneficially used as
soil amendments in commercial landscaping and
agricultural activities.

item & Process
is used to pump raw wastewater
to be biologically treated. The IPS is
,erage flow.
e fine materials from the wastewater
I of the organic materials are washed
-nt process.
stem is where a I I biological treatment
ammonia through nitrification and
e removal of phosphorus.
)ves any phosphorus that is remaining
;s. Methanol is used in this polishing
support the denitrification treatment
lass is separated from the treated
-ie 6NR for further treatment.
larification process which removes all
'eatment process.
The Ultraviolet Disinfection
treatment process is used to
remove all disease causing
bacteria without creating
harmful by-products.
The Reaeration stage of the
treatment process adds
dissolved oxygen to the treated
wastewater to meet required
permit limits before it is
discharged to Northeast Creek.

Lab
Triangle Wastewater Treatment
Plant's (TVMTP) laboratory staff
collects and analyzes wastewater
samples as required by the NPDES
permit and the reclaimed water permit.
Currently, the laboratory is certified by
the Division of Water Resources
Laboratory Certification Branch to
analyze ammonia, biochemical oxygen
demand, total residual chlorine,
conductivity, dissolved oxygen, fecal
coliform, pH, temperature, and total
suspended solids. Staff determines the
age and health of the activated sludge
and identifies microorganisms, such as
amoebae, bacteria, ciliates, flagellates,
nematodes, rotifiers, and water bears.
Fats, Rags, Oil
& Grease
isposing of Fats, Rags,
Oils, and Grease (FROG)
down the drain or toilets
causes build up inside pipes and
could result in a complete
blockage. Clogged pipes overflow
in your home and in the
environment resulting in costly
maintenance and repairs to
residents.
.A
Pipe with Congealed F.O. G.
August 3l, 2024
Notification:
This Performance Annual
Report covering July 1,
2023 through June 30,
2024, was forwarded to
the NC Department of
Environmental Duality.
Public Notice of the report
was advertised in the
Durham Herald sun
newspaper and is availa-
ble for review at the
following locations:
Clerk to the Boat
200 East Main St.
Main Library
300 N. Roxboro St
South Regional Library
4505 S. Alston Ave.
Website
www.dconc.gov/utiides
Certification:
I certify under penalty of law
that this report is complete and
accurate to the best of my
knowledge. I further certify that
this report has been made
available to the users or cus-
tomers of the named system
and that those users have
been notified of its availability.
Stephanie Brixe
Deputy Director