What Happens in the Tank?

  • Anaerobic bacteria begin to break down some wastes in the tank.
  • Wastewater contains suspended solids.
  • Heavy solids settle out and form sludge on the bottom of the tank.
  • Light solids float to the top of the liquid layer and form scum.
  • A liquid layer (called effluent) remains in the middle.
  • Effluent moves out to the drainfield for further treatment.

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