GL0014K Owners Handbook BioDisc BD, BE, BF, BG, ND, NE, NF, NG
Page 6
SECTION 2
DESCRIPTION AND PROCESS
(1) INTRODUCTION
BioDisc systems are designed to accept crude domestic sewage and produce an effluent of
suitable quality for discharge to a watercourse or soakaway system, subject to the approval
of the appropriate regulatory authority. BioDiscs in the range BD to BF and ND to NG are self
contained single piece units.
The main casing and cover of the BioDisc are constructed of Glass Reinforced Plastic (GRP).
All steel parts are stainless, galvanised or surface coated to protect against corrosion. The
discs are vacuum formed polyethylene.
Fig. 2 - General Arrangement of BioDisc System
(2) PRIMARY SETTLEMENT TANK
Crude sewage enters the Primary Settlement Tank (PST), through an inlet pipe in the side
of the BioDisc. Solids are settled out and retained for periodic desludging.
The PST is designed to have sufficient capacity to accept high flows over a short period and
the patented Managed Flow System allows the liquid level to fluctuate to accommodate
such surges.
(3) BIOZONE
The Biozone contains the Rotor, which consists of corrugated polyethylene discs mounted
on a horizontal shaft, supported by a bearing at each end. The bearings are either plastic,
requiring no lubrication or roller bearings continuously lubricated by pressurised grease
cartridges. The Rotor is slowly rotated by an electric motor and reduction gearbox with a
chain or belt drive. Chain drives are continuously lubricated by a pressurised grease
cartridge and brush assembly.
The surface of the discs becomes colonised by naturally occurring micro-organisms, which
form a visible coating known as the Biomass. As the discs rotate, the Biomass is alternately
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