Klargester Biodisc-BA

Klargester Biodisc-BA


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Klargester Biodisc BA (Suitable for 6 People or 4 Bedrooms)

The Klargester BioDisc is the only sewage treatment plant to utilise the "Rotating Biological Contactor" (RBC) system to achieve the breaking down of pollutants plus generation of aerobic bacteria. This cost effective and adaptable solution to a range of domestic waste treatment requirements has been developed by Klargester over some 25 years.

The RBC system is designed and engineered in order to offer superior levels of reliabilty together with extremely low running costs – it is suitable for a wide range of applications.

Here are some of the many applications where the BioDisc system can be used:

  • Domestic dwellings

  • Farms

  • Pubs, Clubs & Hotels

  • Housing Estates

  • Offices

  • Industrial Estates

  • Schools, Colleges

  • Nursing & Care Homes

  • Caravan & Leisure Parks

BioDisc has been designed to meet the British Standards Code of practice BS6297 which relates to the design of domestic sewage treatment works. Effluent treated by a BioDisc unit can be safely discharged to a watercourse but only where consent to discharge has been obtained from the relevant authority e.g. Environment Agency (EA) or Scottish Environment Protection Agency (SEPA). Here are some of the advantages of the BioDisc system:

  • Low energy consumption (only 50 watts).

  • Stable process, the BioDisc gives great performance by producing high levels of purification even under high loads.

  • Certified to EN12566-3 producing 95% pollution reduction - configured to produce a final effluent quality of 20 mg/l BOD5 (ATU)

  • Biochemical Oxygen Demand, 30 mg/l suspended solids.

  • Variable invert options for shallow and deep installations.

BioDisc units are composed of a series of connected reactors and chambers:

  • BioDisc BA-BG are self contained, single piece units.

  • BioDisc BA-BE are available with varying inlet depths to meet varying site levels.

The main structure of the BioDisc unit is made using Glass Reinforced Plastic (GRP) which makes them tough and durable. The 'business end' of the units is of course where the biological action takes place – this treatment happens on the Rotating Biological Contactor, sometimes referred to as the Rotor, in the BioDisc.This rotor is made from banks of polypropylene discs (called 'media') attached to a horizontal, zinc coated steel shaft which in turn is rotated slowly by an electric motor and gearbox.

BioDisc units benefit from low profile GRP covers, which are sectioned to facilitate easy access access. There is also a free-standing, weatherproof control panel supplied with the BioDisc unit.


So how does it work? Here is a brief description of the various stages of the BioDisc process:


Primary Settlement Tank (PST)

Sewage is received and heavier solids are separated and retained for periodic removal. Liquid levels in the PST fluctuate to accommodate incoming flow surges.


First Stage Biozone

Settled liquor moves from the PST to the first stage Biozone where it meets natural micro-organisms (biomass) which in turn colonise the surface of the polypropylene discs or media.

This first stage in the biological treatment process perfoms what is called a 'roughing stage' by absorbing fluctuations both in the Biochemical Oxygen Demand (BOD) and vitally in detergent levels which could otherwise hinder the biological action in the second stage.

BioDisc has a patented managed flow system which then transfers the liquor to Stage 2 of the Biozone at a constant rate.


Second Stage Biozone

Biological treatment conditions are now optimised at this stage since the liquid level is constant.

The media is now partially submerged and as it rotates, the biomass is immersed into the liquor for absorbtion and digestion of waste alternating with exposure to the atmosphere for oxygenation – since this is an 'aerobic' biological process the bacteria being used require an oxygen supply.



Final Settlement Tank (FST)

In this final stage liquor containing excess biomass forms as fine settled solids or 'humus'. This biomass enters the FST via a submerged transfer pipe. Humus is settled out and retained for periodic removal at the same time as the sludge in the PST. 



Size Biodisc BA
Population Equivalent 1 House 4 Bedrooms
Overall Diameter mm 1995
Drain Inverts mm 450, 750, 1250
Depth invert to base mm 1400
Pipework Diameter mm 110
Sludge Storage Period 12 Months
Standard Supply Single Phase
Motor Rating 50W
Weight in Tonns 0.388

Sewage Treatment Plant Properly Registered?

Under the new EPP2 regulations, only septic tanks with the EN12566-3 2005 Certification are allowed to register for the Discharge Permit or Exemption now required by the Environment Agency for all new septic tanks or older tanks which were not previously registered with the Environment Agency for 'Consent to discharge'.

For more important information on the relevant legislation and how this may affect you please take a  look at our Sewage Disposal Legislation page.

If you would like UK Septic Tanks to register your Septic Tank or Sewage Treatment Plant with the Environment Agency then please go to our Registration Service page.

About Sewage Treatment Plants

Sewage treatment plants are rapidly becoming the non-mains drainage replacement of choice for septic tank owners. This doesn't surprise us since they represent a better environmental and durable response to the challenge of not being connected to mains drainage.


Sewage Treatment Plants harness the process of aerobic digestion of bacteria - the most common form of life on the planet. As solid matter settles it gets decomposed by oxygen (hence aerobic) fed bacteria – the coarser solids need longer to be worked on and sludge of settled solids accumulates inside the plant, which will need removing at intervals (usually annually) but dependent upon the specific size and type of plant.


Largely unseen, quiet and watertight these subterranean units receive all the sewage water and waste from your home or business. They are usually made from glass reinforced plastic (GRP) so they're durable and robust. At the end of the bacterial digestion process is an effluent which is surprisingly clean and can be discharged into the ground (soakaway) or a nearby watercourse. This of course is subject to legislation and we recommend you take some time to understand the regulations that are involved.


About Klargester

Founded in 1955 and now part of Kingspan Environmental (a division of the Kingspan Group Plc) Klargester is a company with an international reputation specialising in the manufacture of packaged pollution control products. With a number of 'firsts' to its credit it has developed a range of innovative products, some of which have revolutionised methods of dealing with the treatment of sewage on sites where mains drainage is not available As recognised leaders in the design and manufacture of off-mains drainage solutions we confidently supply and install Klargester products


Epp2 Certified This unit is Epp2 Certified and conforms to the EN12566-3 and can be discharged to a watercourse

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About Us

UK Septic Tanks and Drain Supplies are trading names of The Drainage Company Ltd. We pride ourselves on delivering good customer service and quality products. Because we are a family run business rather than a franchise, we can maintain competitive pricing on all our products – we are one of the largest septic tank suppliers in the UK. Head Office: 20-22 Wenlock Road London N1 7GU

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01296 326111