The Biodigester Bonus is an add-on sewage treatment plant that encloses 2 stages of treatment, the Submerged Aerated Filter SAF and Final settlement with an automatic sludge return and recycling system.
The Biodigester ‘Bonus’ range of sewage / waste water treatment plants has four sizes suitable for populations of 105, 90, 75 and 60. Each Biodigester ‘Bonus’ may be supplied with a new primary settlement tank or may be added after an existing septic or primary tank subject to suitability checks. In either case the treatment process is as described for the Biodigester ‘Standard’ with primary settlement, a ‘Submerged Aerated Filter’ (SAF) and final settlement with an automatic sludge return and recycling system.