NC0021636_Annual Report_20230721

North Harnett Regional Wastewater Treatment Plant
Annual Wastewater Treatment Facility Performance Report
July 2022 - June 2023
General Information
Facility Name: North Harnett Regional Wastewater Treatment Plant
Responsible Entity: Hamett County Public Utilities
Harnett County Public Utilities Director: Steve Ward
Operator In Responsible Charge: Billy Thomas
Telephone: [phone]
NPDES Permit Number: NCO021636
Description of Process
The North Harnett Regional Treatment Plant is a 7.5 MGD Sanitaire biological wastewater treatment
facility with nutrient removal. This facility is a true regional treatment plant that serves the Lillington,
Fuquay-Varina, Coats, Buies Creek, Erwin and Angier communities, resulting in the consolidation of 5
separate discharges into one.. The treatment train begins at the headworks, where the raw wastewater is
screened to remove paper, plastic, rags and any other debris greater than 1/8 inch in diameter. The
wastewater then flows to the grit removal system where heavy inorganic material such as sand is settled out
and removed. The flow is then measured through a parshall flume and recorded on a 24 hour interval. The
biological treatment occurs in one of two 3.75 million gallon oxidation ditches. Here organic and chemical
compounds are reduced by microorganisms under aerobic conditions. Once reduced, this wastewater is
routed to the anoxic tanks where nutrient bi-products from the aerobic treatment are further removed. When
the biological treatment is complete, the wastewater flows to one of two 1.1 million gallon clarifiers. Here
the activated sludge is allowed to settle to the bottom of the tank where it is pumped back to the treatment
units to treat more raw waste. The clear water leaves the clarifiers and flows to four disk filters and three
traveling bridge tertiary filters where fine solids are separated from the final effluent. After filtration, the
treated effluent is disinfected with Ultra -Violet light. Finally, the effluent moves to the cascade aerator.
This helps add oxygen to the water before it flows to the Cape Fear River.
Performance
North Harnett Regional treated 1.548 billion gallons with an average daily flow of 4.24 MGD. We
achieved a 99% removal efficiency for BOD, 99% for TSS and 99.9% NH3 along with an 85% and
47% removal of Total Nitrogen and Total Phosphorous respectively.
Notification
This report will be available for public inspection at the Harnett County Public Utilities administration
office during regular operating hours.
Certification
I certify under penalty of law that this report is complete and accurate to the best of my knowledge.
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ORC: Billy Thomas
Title: Treatment Plant Supervisor
Entity: Harnett County Public Utilities
Date: 7-21-2023