“The Flow Path contains, a two stage primary settlement zone designed to settle coarse and non-biological loadings.
Sludge will build up in these zones and require moving periodically. The Settled effluent will then discharge forward into the bio-zones. Each segment field contains a high percentage of filter media, where biological treatment performs , due to a high oxygen input. Once treatment has taken place the multiple bio-zones, the effluent is discharged into the final humus tank, where it settles before flowing via the outlet.
Occasionally an amount of settled humus sludge is returned to the first primary zone’