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Biodisc Sewage Treatment Plant - Klargester
Waste Tech will supply and install Klargester sewage treatment plant throughout the UK. The Klargester BioDisc was the first sewage treatment plant to really enter the small domestic UK market in the 1970's. It gives excellent, reliable quality effluent when maintained correctly. It has the EN 12566-3 2005 Certification.
Only manufacturers with this certification are now legally able to sell treatment plants in the UK and Europe, though many manufacturers are continuing to sell illegally. Klargester produces two types of package sewage treatment plants, the BioDisc and the Envirosafe. Please ring for a price or click here for servicing, spare parts and repair costs. Checklist
How the Biodisc sewage treatment plant worksBiodiscs are three stage sewage treatment plants. The biodiscs themselves treat the sewage effluent after it has passed through a Primary Settlement Tank. The primary settlement tank settles the solids which form a sludge in the bottom of the tank. The biodisc process involves allowing the wastewater to come in contact with bacteria which grow on the biodiscs and digest the pollutants in the wastewater before discharge of the treated wastewater to the environment, usually a ditch or stream. A biodisc or RBC sewage treatment plant can be all three stages housed in one tank (Klargester Biodisc) or separate stages in different tanks. It consists of a series of closely spaced, parallel discs mounted on a motor-driven rotating shaft which is supported just above the surface of the waste water. The rotation is achieved via a gearbox and bearings on either end of the biodisc shaft. Micro-organisms grow on the surface of the biodiscs where bacterial digestion of the sewage pollutants takes place.
The rotating packs of biodiscs (known as the media) are contained in a tank or trough. Commonly used plastics for the biodisc media are polyethylene, PVC and other plastics. The shaft is aligned with the flow of wastewater so that the discs rotate at right angles to the flow with several packs usually combined to make up a treatment train. About 40% of the biodisc area is immersed in the wastewater and the RBC biodisk plants usually protrude out of the ground. Biofilms, which are biological growths of biomass that become attached to the biodiscs, digest the organic materials in the wastewater. Aeration is provided by the rotating action, which exposes the biodiscs to the air after contact with the wastewater. The biomass on the discs 'breathes and eats' as it rotates. The degree of wastewater treatment is related to the amount of media surface area and the quality and volume of the inflowing wastewater.  Typical cross sections through Rotating Biological Contactor or biodisc type system biozone The treated effluent then flows to a final settlement tank where dead bacteria and small particles settle to the bottom. The cleaned effluent then discharges through the outlet. It is ESSENTIAL that the water level in Biodisc plants NEVER rises up to the level of the belt/chains or motor. This can happen if groundwater levels or ditch water levels rise during wet weather and flow into the biodisc unit from the outlet pipe. The belts can transfer the water to the motor and blow it. Once the biodiscs have stopped turning for any amount of time, it can be very difficult to start them again without breakage, due to the sludge build-up at the bottom of the biodiscs. A new biodisc pack is expensive. If in doubt about your water levels in wet weather, FIT A PUMPING STATION with a non-return valve or syphon after the biodisc unit.
Klargester Biodiscs are available in the following sizes:-
All above prices are subject to VAT but include delivery. Klargester Biodisc BA to BG detailsBIODISC®
SEWAGE TREATMENT PLANTS UNITS BA - BG INTRODUCTION
Biodisc systems offer a solution to a wide range of domestic sewage treatment applications. The range employs Klargester’s patented Managed Flow Technology to enhance the effectiveness and consistency of the treatment system. At the core of the Biodisc lies the Rotating Biological Contactor (RBC) Technology, which Klargester has developed and refined over a period of 25 years. APPLICATIONS
Both domestic and commercial DISCHARGES
BioDisc is designed to conform to the British Standard Code of Practice BS6297 relating to the design of small sewage treatment works. Treated effluent from BioDisc units may be discharged directly to a watercourse where a consent has been obtained from the relevant authority; EA (England & Wales), SEPA (Scotland) Local Authority Public Health Department (N Ireland & Eire). The units are configured to produce a final effluent quality of 20 mg/l BOD5 (ATU), Biochemical Oxygen Demand, 30 mg/l Suspended Solids. If a more stringent quality effluent is required, or if an Ammonianical Nitrogen level is specified, the BioDisc may be reconfigured to meet the required specification. Details on application. DESCRIPTION
The BioDisc unit utilises a series of connected reactors and chambers. BioDisc units BA-BG are self contained, single piece units: BioDisc units BA-BE are available with varying inlet depths to suit site levels (see the table overleaf). The main structure of the BioDisc unit is constructed from Glass Reinforced Plastic (GRP). Biological treatment occurs on the Rotating Biological Contactor, or Rotor, in the BioDisc. The Rotor comprises banks of polypropylene discs (media) attached to a horizontal, zinc coated, steel shaft and is slowly rotated by an electric motor and gearbox. The BioDisc has a low profile GRP cover, arranged in sections to facilitate access. A free-standing, weatherproof, local Electronic Control Panel is supplied with the BioDisc. PROCESS
1. Primary Settlement Tank - Incoming sewage is received in the PST where settleable solids are separated and retained for periodic removal. The liquid level in the PST is allowed to fluctuate, to absorb incoming flow surges. 2. First Stage Biozone - The settled liquor passes from the PST into the first stage Biozone where it comes into close contact with natural micro-organisms (biomass) which colonise the surface of the media. This first stage of the biological treatment acts as a roughing stage, absorbing fluctuations in the Biochemical Oxygen Demand (BOD5) and detergent levels which would otherwise inhibit biological action in the second stage. The patented managed flow system transfers the liquor to the second stage Biozone at a constant rate. 3. Second Stage Biozone - Treatment conditions in this stage are optimised, as the liquid level is constant. The media is partially submerged and, as it rotates, the biomass is alternately immersed in the liquor for adsorption and digestion of waste matter and exposed to the atmosphere for oxygenation. 4. Final Settlement Tank (FST) - Liquor containing excess biomass as fine settleable solids (humus) enters the FST through a submerged transfer pipe. Humus is settled out and retained for periodic removal at the same time as the sludge in the PST. The final discharge from the FST is by a dip-pipe (excepting units with integral discharge pump - see below). DISCHARGE PUMPING
Effluent pumping stations are available (single or twin pump) for applications where the discharge has to be lifted to a higher level or pumped to remote discharge point. Details on request. BA and BB BioDisc units can be supplied with an optional integral discharge pump. ALARMS
Alarms are available to signal loss of rotation and failure of the discharge pump (where applicable). Details on request. EQUIPMENT SELECTION Maximum daily hydraulic and organic loads shown overleaf are for general guidance only. Please consult us for site specific selection. All applications are individually assessed, considering a number of factors, including the expected hydraulic flow, organic load, ammonia levels and treatability. DELIVERY & INSTALLATION Units are normally delivered by flat bed vehicle and the installer should provide lifting facilities for off-loading. BioDisc units are installed on a concrete base and surrounded with concrete. BA & BB units can be surrounded in pea shingle if ground conditions allow. Installation Guidelines are supplied with each unit.
GREASE TRAPS WTE offers a range of grease traps and separators. These are required on sites with commercial catering facilities, to prevent excessive concentrations of fats, oils and greases interfering with the biological processes within the BioDisc. SINGLE-PIECE BIODISC SPECIFICATION BA-BG
The sizing of Sewage Treatment Plant requires specialised knowledge and experience. Please consult Waste Tech for an assessment of your application
Click here for the Klargester Biodisc Brochure Powered by Create |
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