Aerial view of the Warren, Maine lagoon system. Photo courtesy of Woodard and Curran.

Lagoon Systems In Maine 

Systems In Maine

An Informational Resource for
Operators of Lagoon Systems

Mars Hill Wastewater Lagoon System - Mars Hill  Maine. Photo Courtesy of Wright-Pierce Engineers.
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 Milo, Maine

 Milo, Maine

 Milo, Maine

   The Milo Slow Sand Filtration Plant was constructed to meet the standards of the Safe Drinking Water Act Amendments of 1986. It was designed by A. E. Hodsdon, Consulting Engineer of Waterville, Maine, built by Brescia Construction of Clinton, Maine and funded with assistance from Rural Development.

   The filtration method chosen is termed "Slow Sand Filtration" due to the slow rate which the water is filtered; this technology is over 100 years old. The raw water is drawn from the Sebec River and pumped from the Main Street pumping station to the treatment facility. Once it reaches the treatment facility it is pretreated by a microscreen, if needed, and then flows gravity to the filter beds. The filter media consists of a 36 inch layer of sand, a 3 inch layer of rice stone ( 1/16 to 1/4 inches ); a 3 inch 1ayer of pea stone (1/4 to 3}8 inches); a 3 inch 1ayer of crushed stone (3/8 to 1/2 inches) and a 12 inch layer of crushed stone (1/2 to 3/4 inches). The filter itself provides treatment by a straining effect, however, the filter layer of most interest is the top few inches of sand which develops a biofilm called the "Schmutzdecke". When a micro organism comes in contact with the sand and biofilm, it is adsorbed and metabolized, thereby preventing its passage. In total the treatment plant provides a triple barrier (microscreen, sand filter, and disinfection) to prevent the passage of Giardia bacteria and other undesirables in the water system. The filtered water is collected by an underdrain system and is chlorinated as it travels gravity to the reservoir. The reservoir is a concrete tank holding 500,000 gallons of water and allowing 2 1/2 days of detention time at average flows.

 Milo, Maine
   The facility is designed with 3 filter beds; each sized at 23' 8" wide and 81' tong with each holding 50,000 gallons of water. The center filter has a 6 inch layer of granular activated carbon which is sandwiched 12 inches below the sand. This GAC sandwich was installed to enhance the removal of naturally occurring organics which contribute to reduce color and the formation of trihalomethanes (THM's ). THM's are formed when the organic matter reacts with chlorine used for disinfection. The GAC effectively removes the organics before this reaction can take place.

   The treated water quality is required to meet the following Federal and State imposed Standards:

   Turbidity (a measure of particles in the water): Less than or equal to 1.0 NTU in a minimum of 95% of samples taken;

  Chlorine Residual (a measure of disinfection): Greater than 0.2 milligrams per liter of Chlorine Residual.

   The facility meets these requirements with ease and requires minimal manpower to operate.

   The project funding was provided through Rural Development. The District received a grant in the amount of $1,182,700.00 and long term low interest loans in the amount of $1,820,300.00 making a total project cost of $3,003,000.00 This included the treatment facility at a cost of of $1,367,020.20 plus Park Street distribution main, pump station retrofit and a transmission main to the treatment facility.


Milo Maine

Facility Operator Tim Gormley  - Superintendent
Address 62 Main St.
  Milo, Maine 04463
Telephone (207) 943 - 2501
Fax (207) 943 - 2501

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 Milo, Maine

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