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Maine Wastewater Control Association

Town of Scarborough
 What We Do
Schematic
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Influent - Step 1

Influent is the raw wastewater collected through a maze of sewer mains which flows into the wastewater treatment plant.

Screening - Step 2

Screening removes roots, rags, cans, large debris.

Grit Removal - Step 3

Removes sand and gravel.

Primary Treatment - Step 4

Sedimentation and flotation removes settleable and floatable materials.

Aeration - Step 5

Large tanks where wastewater is introduced to aerobic bacteria to further break-down wastewater. Wastewater continues to further treatment processes and sludge is removed to be refined into compost.

Sludge Treatment - Step 6

Sludge moves to the sludge holding tank. Sludge material continues to dewatering process where liquid is recycled back to aeration process and sludge is prepared for composting.

Sludge Composting - Step 7

Composting is achieved using the Aerated Static Pile method. Dewatered sludge is mixed in equal parts with wood ash and wood shavings. This mixture is aerated for 21 days then cured for an additional 21 days. Finished compost is then tested and sold locally.

Secondary Treatment - Step 8

Secondary treatment removes suspended and dissolved solids and prepares treated wastewater for discharge.

Disinfection and Testing - Step 9

Treated wastewater is disinfected before being released into the ocean.

Effluent - Step 10

Effluent is wastewater, which has been treated & disinfected.


Schematic
Click to Enlarge
   Copyright © 2007 Scarborough Sanitary District




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