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News: Plant Spotlight

Plant Spotlight: SUMMER 2017

Monday, December 18, 2017  
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West Brunswick Water Treatment Plant

 

 

Oxidation Ditches


 

Tertiary Disc Filter System

 

 

ATAD Reactors

 

 

Reuse Pump Station

 

 

SCADA System

 

Originally published in the Spring 2017 issue of NC Currents magazine.

General

Located along the coastal portion of the
state, Brunswick County borders the Cape
Fear River to the east and South Carolina
to the southwest. It has a population of
approximately 123,000 people and is the
fourth largest county in NC by geographic
area. The Cape Fear River and its offshoot,
the Brunswick River, provide access to the
Atlantic Ocean.


Brunswick County operates six
wastewater treatment facilities (WWTF), the
largest being the West Brunswick Regional
WWTF, which is a 6.0 mgd non-discharge
facility. The facility was placed into service
in 2006 as a regional facility to serve
Brunswick County, Oak Island, Holden
Beach and Shallotte. Additionally it treats
flow from Southport and Ocean Isle Beach.
The facility was originally permitted for
3.0 mgd, but with the unprecedented
growth in the area, it was expanded to
6.0 mgd in 2009.


There are 54 lift stations associated with
the West Brunswick WWTF. The collection
system is comprised of low-pressure sewer,
vacuum, and some gravity filters. The facility
receives flow from as far as 25 miles away

 

Operations

The West Brunswick Regional WWTF
serves a population of approximately
55,000, but due to the geographic region,
it can see high tourist-driven flows in the
summer months. The wintertime flow
averages approximately 2.6‑2.8 mgd.
Summertime flows average 3.6-3.8 mgd,
with a maximum daily rate of over 7 mgd
(storm-related event). The facility’s annual
operating budget is approximately $3 million
and includes both the WWTF and all
dispersal sites (discussed below).


The key treatment processes include:
(4) Equalization basins
(3) Parkson bar screens
(2) Grit removal systems
(4) Lakeside Equipment oxidation ditches –
1.5 mgd each
(4) US Filter TowBro clarifiers
(4) Kruger tertiary disc filter systems
(1) Reuse pump station consisting of
6 pumps ranging from 100 to 150 HP
(1) Lakeside Equipment septage
receiving station

 

Solids Handling

The solids handling process consists of
two gravity belt thickeners followed by four
auto-thermal thermophilic aerobic digestion
(ATAD) reactors (Thermal Process Systems)
and an ATAD storage tank. The facility is
permitted for up to 500 dry tons per year
of biosolids disposal. Brunswick County
administers its own land application
program and contracts with Bio-Green
to handle all sludge hauling and disposal
of biosolids from the facility. The plant
produces a Class A product that is provided
to local farmers for fertilization.

 

SCADA

 
The entire facility is automated using a programmable logic controller (PLC)-based control system. The system is based around Schneider Electric Quantum and Momentum PLCs. The monitoring is based on Citect HMI Graphics. The department (encompassing both sewer and water) has an extensive SCADA system that requires a full-time SCADA programmer.

 

Disinfection

The disinfection system feeds sodium hypochlorite into the reuse water to maintain the required residual prior to the dispersal field. The system utilizes Blue-White feed pumps. All discharge points are sampled and tested periodically to verify that the correct residual is maintained.

 

Reuse Water Dispersal

 
1. Drip Irrigation – 1.722 MG, 497.32 acres of dedicated drip irrigation, 99 million gallons of wet weather storage. This equates to over 1 million feet of drip irrigation tubing!


2. High Rate Infiltration and Dedicated Spray Irrigation – (2 sites – IP and Mercer Mill tracts) 2.540 MG, 88.74 acres of combination infiltration basins and dedicated solid set irrigation. A total of 11 infiltration basins and 14.9 MG of wet weather storage.


3. Golf Course Irrigation – 1.746 MG, 252 acres (2 sites – St James and Winding River) 16 MG of storage at the combined sites. The WWTF has a huge system dispersed across five different disposal sites, a total of approximately 840 acres. The reclaimed water infrastructure ranges from 2-inch to 24-inch “purple pipe” and pumps capable of up to 3,300 gpm. There are 17 different pumps associated with conveying the reclaimed water throughout the system and
over 25 miles of dedicated reclaimed water discharge piping. Geographically, it takes over two hours to go site to site for daily checks – excluding the golf course options.

 

Personnel

The facility operates with nine full-time employees and four proportional employees – maintenance mechanics/ lab personnel shared with other facilities within the county. The staff is proud of the fact that they have six full-time day and shift operations staff, four Grade IV WW operator certifications, one Grade II operator license and one trainee. Several staff members also have spray irrigation and land application certifications. In addition, the maintenance staff also hold spray irrigation and maintenance mechanic certifications. This is made possible through the Career Ladder program, which encourages staff development.

Awards

The West Brunswick Regional facility received the 2008 Pisces Award from the Clean Water State Revolving Fund (SRF) for innovative and effective use of SRF financing mechanisms.

 

Safety

The safety of the employees is something the staff takes very seriously. They are continually looking for innovative ideas and ways to improve on the overall safety program. They are very proud of the fact that they have not had a lost-time accident in the history of this facility. The weekly tailgate meetings cover a broad spectrum of safety-related topics; the monthly meetings further enforce with a safety topic. The staff has quarterly department-wide safety meetings that encourage participation in

 

Contact Information

Donald Dixon, Wastewater Superintendent
235 Grey Water Road
Supply, NC 28462
Phone: (910) 755-7921
donald.dixon@brunswickcountync.gov

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