Article | REF: C3845 V2

Management of sewage of on-site wastewater treatment disposal

Author: Jean-Marc BERLAND

Publication date: May 10, 2024

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1. Definition of septage

1.1 Sewage sludge in the strict sense

Faecal matter is the residue left over from the treatment of individual wastewater systems. They are initially discharged into pre-treatment facilities, which are :

  • septic tanks, which receive and pre-treat only black water;

  • all-water pits, which receive and pre-treat black and grey water.

In exceptional cases, watertight pits are used to store black water only.

For septic tanks and all-water tanks, these materials come from :

  • the decantation of suspended matter, whether organic or mineral;

  • of the floaters that make up the cap...

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Definition of septage