Naburn provides sewage/imported sludge waste treatment for the York area. Part of the onsite treatment process involves anaerobic digestion of the biomass utilising sunken digesters with a top entry mixer. Unfortunately over a period of 6-12 months the mixer becomes ragged up with fibrous materials significantly reducing the digester operation and biogas production. In addition to the mixing system the aging heating recirculation system also required updating to meet the new systems operating requirements.
ACWA’s scope involved the design and installation of 1 No Digesters mixing and heating recirculation loop with a compressed biogas mixing system which:
36No Actuated External to Internal biogas lancing for digester mixing
Duty/Standby Biogas Compressors
Spiral Heat Exchanger with duty/standby recirculation pumps
Digester anti-foam suppression system
Condensate reduction within Biogas mains
Biogas quality monitoring station
Biogas Bulk storage, Flare Stack and Transfer to CHP engines