PlanetDISK Rotating Biological Contactor Wastewater Treatment Plant-11359
Product Code: MX1
Domestic wastewater will be treated in the Wastewater Treatment Plant consisting of two main parts. These are respectively Physical Treatment and Biological Treatment Units.
Physical Treatment Unit consists of,
- Manually / Automatically Cleaned Coarse and Fine Screen,
- Grit and Grease Trap Plate,
- Pre-Sedimentation Tanks,
- Equalization Tank and Lift Pumps.
Wastewater will come by gravity to Grit and Grease Trap by passing through Manually / Automatically Cleaned Coarse and Fine Screen. The separated grit and grease will be removed from the system, and the wastewater will respectively flow through 1st Pre-Sedimentation Tank, 2nd Sedimentation Tank and Equalization Tank by gravity. Equalization Tank will provide the wastewater to be stored and equalized in order to have homogenous mixture of wastewater. The pollution and flow characteristics of domestic wastewater show variation during the day. The wastewater is collected in the Equalization Tank in order to lift the system under controlled and constant conditions by means of hydraulics and pollutant loading, thus improving the efficiency of the treatment. This tank can also be used as reserve against peak loading conditions. By lifting pumps in Equalization Tank the wastewater will be pumped to PlanetDISK® Rotating Biological Contractor Unit which is the core part of the treatment plant where the biological oxidation (treatment) of the pollutants achieved. The PlanetDISK® RBC Unit consists of polypropylene media attached to a central shaft and is supported by two bearings, which are mounted on the main steel frames at each end of the units. One of these frames include the fixing assembly for the motor-reduction gear box.
The PlanetDISK® is rotated slowly through a direct drive reduction gearbox and is arranged so that around 40% proportion of its surface area is submerged in the effluent at any time. As the PlanetDISK® rotates, the surface of the media is subjected alternately to sewage and air, encouraging an aerobic, biologically active film of micro-organisms (biomass) to become established on each side of the media sheets.
This biologically active film grows in size, is self-regulating and oxides the pollutants in the sewage. The micro-organisms use the polluting material (measured as BOD) as a substrate (food) and as they do so, multiply in number, maintaining a specific biomass thickness to ensure optimum process efficiency.
Material from the whole stages of the RBC is kept in suspension via rotation and carried forward into the Lamella Type Final Clarifier by gravity. Lamella Separators are clarification devices designed to compress the capacity of a large conventional clarifier into a compact, economical footprint. Surface area for settling is provided by arrays of PVC or PP plates, installed at an angle of 55°. Accumulating solids settle, agglomerate and flow down the sloped plate surfaces, while clear water is conducted upward.
The sludge collected at the bottom of the Lamella Separator is drawn off via sludge pump periodically every 1 hour for 1-2 minutes. The sludge is pumped to one of the Sedimentation Tanks.