SBR typeactivated sludge plants

Standard active sludge treatment is not suitable for small loads (i.e. including up to a couple dozen population equivalent), as it is excessively affected by hydraulic flow and organic load peaks. The best option for such specific requirements is a non-conventional batch system, free from all the issues described above.

Treatment process stages

Stage 1, Primary settling
Stage 2, Filling oxidation chamber
Stage 3, Biological oxidation
Stage 4, Separation water-sludge
Stage 5, Discharge

Process description

The treatment process includes the following stages:

PRIMARY DECANTATION in an Imhoff tank or directly in the sedimentation pre-chamber, according to type of load to be treated.

ACTIVE CHAMBER FILLING that is feeding the clarified waste water to the next tank.

BIOLOGICAL OXIDATION the sewage is oxygenated by means of a submerged aerator and comes in contact with the microorganisms present in the active sludge. Organic matter is thus transformed into stable matter with very high plant purification yield, which varies according to duration of the oxygenation stage and to the degree of sludge concentration in the tank. In addition, alternating oxidation and anoxia stages allow for an effective denitrification process.

SETTLMENT STAGE still in the same tank, with aerator off, the active sludge settles on the bottom, below the purified waste water surface.

DISCHARGE STAGE in which the pollution load-free waste water is directed to the drain.

The strong point of this system lies in the possibility to adjust the duration of each stage according to specific requirements.

Running and maintenance

No special running requirements apply; in fact it is usually sufficient to carry out emptying operations just twice a year. Manholes are adequately sized for easy and fast maintenance of electromechanical parts.

Fully automated operation and low power consumption.

Products and technical features

Plants are made up by one or more concrete tanks, installed to suit required arrangement. Given their compact size and extremely low visual and acoustic impact, the electrical panel and the compressor are suitable for installation in dwellings.