As sewage is moved to treatment centres via pumped systems there is a risk of waste ...

pumped sewer septicity

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As we know septicity is a question of time and is due to natural process, so we can limitate it but not avoid it.

few advices :

- volume of suction tank should be the minimum according to technical needs;

- use mixer and flush valves in this tank;

- bottom of sewerage as smooth as possible and without step or discontinuity;

- in rising pipe avoid change of slope that create vertical elbow;

- pipe diameter and pumps flow rate aiming to have a correct minimum velocity.

If retention time is too long than you'll need chemical dosing compatible to the final WTP 

 

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