High Performance Package Sewage Treatment Plants
Residential, Business & Leisure Applications

The Klargester BioDisc® utilises proven rotating biological contactor (RBC) technology, and this range of larger BioDisc® treatment plants now enables Klargester Environmental to offer solutions against a much wider range of applications.

Improving environmental standards, more stringent controls, new European guidelines and the introduction of new Building Regulations have placed greater responsibility on specifiers and users to ensure they select the correct treatment system for their application.

Klargester BioDisc® treatment plants have been designed to provide an engineered package solution to meet a wide range of applications and discharge qualities.

Process Design:
The Klargester BioDisc® uniquely provides four separate treatment zones within a single vessel.

Primary Settlement Section: (1) Wastewater enters the primary chamber. Solids and heavy particles, including non-biodegradable items, settle and consolidate into a sludge which requires periodic removal. Liquid still containing some solid particles rises upwards into the Primary Biozone: (2) Discs in this area, rotating at approximately two revolutions per minute, allow oxygen to be absorbed into the developing biofilm as naturally occurring bacteria attach to the discs. These discs provide a highly beneficial pre-treatment area.

Flow Management Device: (3) Forward flow is controlled by a baling device attached to the rotor assembly and a pre-determined volume of partially treated waste is transferred into the secondary disc zone. Incoming flows in excess of the baling device capacity stay in the primary area and it is this that creates hydraulic balancing within the plant. Zones 1 and 2 (as above) between them have a balancing capacity equal to approximately 25% of the design flow of the plant and it is this feature that can allow the plant to retain six hours flow in the event of a power failure. This is now a requirement under the latest Building Regulations Part H2.

Secondary Disc Zone: Flows entering this zone are exposed to a second and separate bank of discs on which grow a further matrix of bacteria. Protected from flow variation and harmful contaminants, the bacteria efficiently use the nutrients in the effluent as a food source.

The rotation of the discs creates a gentle flow path within both disc zones that moves wastewater along the zone and rotation also sloughs ageing or surplus bacteria from the discs creating space for new bacteria to develop.

A key benefit of BioDisc® is that the whole surface area is continually regenerated with new biological growth and that there is constant replenishment as all spent bacteria are flushed into the final settlement zone.

It is often the case with submerged or fixed media treatment processes, that the biological zones become clogged with dead or excessive biological growth, inhibiting treatment and demanding expensive and dirty maintenance.

Final Settlement Zone: (5) The almost fully treated effluent, is displaced from the disc area into the final settlement zone. The final settlement zone is fitted with a simple sludge return pump that transfers the settled material from the base of this zone into the primary settlement zone. This improves process performance by protecting the outlet and returning dilute and active biomass into the primary tank. This feature can be modified for seasonal flow variations.

The final effluent, free from solids and pollutants, exists through the outlet pipe.

Process Features

• Klargester Patented Flow Management (KPFM)
• No process maintenance required
• Simple mechanics
• Self generating bacteriological process
• KPFM provides the capability to adjust plant performance
• Compliance with BS EN 12566-3 (BioDisc® BE-BF units only), BS 6297 and Building Regulations Part H2
• Sludge return pump in final settlement tank to enhance performance. Sludge return can be configured to help overcome seasonal flow variations
• No odour or environmental nuisance
• Silent in operation
  

Consistent Effluent Quality
These plant are designed to achieve an effluent quality of 20mg/l BOD, 30mg/l Suspended Solids and 20mg/l Ammonia on a 95% basis. These BioDisc® can also be configured to produce better standards of effluent quality with Ammonia levels as low as 5mg/l being achievable. Contact Klargester Environmental for design support and further information.

• The systems are designed to deal with flows up to 3xDWF.
• Applications where commercial catering takes place will generate significant volumes of grease which should not be allowed to enter any treatment system.
• Klargester Environmental manufacture a wide range of grease traps and their specialist advice should be sought in these types of applications.
• The treatment of sewage from applications other than domestic housing can often demand special precautions, therefore specialist advice should be sought from Klargester Environmental.

Effluent Pumpsets
A septic tank or treatment system pumpset can be used to disperse settled effluent when a site has a high water table or adverse invert levels. Installed after the treatment system and pumping settled effluent up to an inspection chamber, flow to the drainage system then takes place by gravity in the normal way.

Sample Chambers

Control Panel

Low Operating Cost

BioDisc® has proven track record for high quality performance, reliability and low operational costs and the new range incorporates features that further enhance that reputation:

• designed to run from either a single phase or 3 phase power source
• require 60 to 370 watt motors, offering the lowest running costs of any plant in their class

Direct Drive

The disc assembly rotates through the sewage effluent and supports the growth of a biological matrix. When fully loaded with saturated bacteria the disc assembly becomes heavy, therefore both drive and rotor design are critical. Klargester Environmental have many years experience in this field and these new products provide a number of new features:

• direct drive motor which is fixed directly to the disc shaft*
• no requirement for chain or belt drive**
• reduced and simplified maintenance

Two-Part Shaft

A two-part shaft has been incorporated to simplify maintenance and reduce bearing wear. The new Klargester Environmental two-part shaft assembly:

• supports the rotor in four places rather than two
• significantly reduces the load and wear on the shaft and bearings
• features bearings selected for long life
• features bearings fitted with automatic grease capsules that only require annual replacement
• simplifies installation by reducing potential drive alignment and bearing wear problems sometimes associated with long single shaft motors

Rotor Design

New range includes the well established Klargester Environmental rotor design which:

• is compact and structurally sound
• is designed and built for long life without the need for rotor maintenance often associated with sectional bolted rotor assemblies

Monocoque Casing

All BioDisc® in this range utilise the same casing, providing:

• lightweight, yet robust and structurally strong GRP construction for easy on-site handling
• steel cradle integrated into the casing provides stable platform for mechanical components
• factory pre-engineered to exacting Kingspan Environmental standards, ensuring consistent high quality and eliminating on-site assembly
• full length ports providing quick and easy access for desludging
• 600mm invert depth, with only 150mm head loss through the plant
• variable desludging/emptying cycles