











2003
Maine Wastewater Salary Survey as conducted by the Maine Wastewater Control
Association

2003 Maine
Wastewater Rate Survey conducted by the Maine Rural
Water Association

Maine DEP Monthly
O & M Newsletter
Maine and WEF's
Operation Forum
Penobscot Watershed and Development of a TMDL
EPA Binational Toxics
Strategy
Maine Rural Water
Association
Maine Wastewater
Operator Certification
Guide
Maine Is Technology
Newsletter
Maine
Wastewater Control Association

Maine
Wastewater Engineering
Firms
| |

The Warren Sanitary District’s 244,200
GPD ultraviolet disinfection wastewater treatment plant in Warren,
Maine uses new technologies to operate as cost-effectively and
efficiently as possible. The plant’s facultative lagoons are
designed and operated to combine anaerobic, anoxic, and aerobic
biological processes for effective operations and to reduce energy
use and sludge production. Baffles and a recycle pump station in the
primary lagoon further enhance process efficiency.
The sewage treatment system includes three pump stations and over 10
miles of collection system.
A dissolved air flotation system removes algae prior to disinfection
and makes the effluent quality less susceptible to seasonal
variations typical in lagoon systems. Woodard & Curran has operated
the plant since 1991.
Thus far operations have been very successful.
Designed to take advantage of innovative developments in facultative
lagoon and disinfection technology, the facility also blended
funding sources to create low and stable user charges for users
within the Warren Sewer District.
The use of the latest ultraviolet disinfection technology in the
disinfection system was chosen due to advantages in the areas of
safety, ease of operation, and the elimination of disinfection
by-products and has proven very successful. Ongoing evaluation and
monitoring by operations staff generates useful information shared
with Maine DEP, other regional treatment plants, and even national
journals and associations to expand the body of knowledge
surrounding this application of synergistic technologies.
Lagoon
Specifications

Lagoons |
No.1 |
No. 2 |
No. 3 |
No. 4 |
Volume |
5.59 MG |
1.58 MG |
1.58 MG |
0.61 MG |
Lagoon Size |
500' x 145' x 18' |
230' x 125' x 18' |
230' x 125' x 18' |
150' x 80' x 12' |
Lagoon Acreage |
1.66 acres |
0.66 acres |
0.66 acres |
0.27 acres |
Aeration |
Surface Aspirating |
Surface Aspirating |
Surface Aspirating |
Surface Aspirating |
Comments:
Total lagoon acreage is 3.25 or
141,570 square feet. Aerator manufacturer is Aeration Industries,
model is the Aeromix Tornado. Design Data as follows: 360 mg/l
(BOD) 370 mg/l (TSS)
|
System Information

Design Flow |
0.2442 MGD |
Actual Flow |
0.050
MGD |
Discharge To |
St.
George River |
Year Built |
1992 |
Design Engineers |
Woodard
and Curran |
Septage Received |
No |
Collector System |
6
miles of gravity sewer, 4.5 miles of force main,
120 manholes, 6 pump stations |
Staff Size |
2
Full Time, others as needed. |
Number of Users |
309
people |
Billing Software |
M.Y.O.B. (Macintosh) |
Comments |
Dissolved air filtration, ultraviolet
disinfection, effluent storage, partial seasonal storage lagoon. |

Back to Lagoons
in Maine
|
|
|