Similar to a septic tank, a digester treats waste with anaerobic bacteria but includes a methane gas collection system.

Treatment Level:  Primary
Relative Cost:
  high
Amount of Maintenance Interaction:  high
Beneficial Byproduct:  some –  lots (gas and nutrient rich slurry)

Advantages

Disadvantages

Operation & Maintenance

Blackwater vs Graywater?

Secondary Treatment Options

Additional Notes:

Farm Scale Example (www.diclatraining.com)
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