Robuschi has been a leading partner for the wastewater industry for many decades. Its rotary lobe blowers, screw compressors and centrifugal pumps offer energy-efficient and sustainable solutions for a variety of applications in this field, such as primary sedimentation, aeration, slurry liquid pumping and back washing sand filtration.
The aeration tanks in wastewater treatment plants are activated with oxygen by using compressed air. A thorough mixing of the sludge with oxygen increases the gas yield and reduces its retention time in the tank. Even better results are achieved with warm compressed air. Blower or screw blower technologies can be found in various types of wastewater treatment plants,including aerobic activated sludge systems, SBR, nitrification-denitrification in a single basin and MBR.
Air is used to expand the filter bed, breaking up compacted material. Clean backwash water is pumped in, suspending the loose material from where the particles are lifted through and carried away.
In the primary sedimentation stage, sewage flows through large tanks. These tanks are used to settle sludge while the grease and oil rises to the surface and is skimmed off. Primary settling tanks are usually equipped with mechanically-driven scrapers that drive the collected sludge continually towards a hopper in the base of the tank where it is pumped to treatment facilities using rotary lobe blowers or similar technologies. As a result biological materials remain on the surface and the heavy components (mainly sand) are isolated.
Using slurry pumps, tough, abrasive, viscous liquids and particles in suspension can be transferred from one tank to another.