Systems of Biological Purification of active sludge: "contact-stabilization outline"

The system that is constructed with the contact-stabilization outline introduces economic advantages over the traditional systems in that it does not recommend the reservoir of primary sedimentation (to discourage nauseous smells) while the stabilization of the surplus activated sludge happens via aerobics in an appropriate manner.

Advantages:

• Treatment of the urban sewage water is characterizes by an elevated suspended concentration of solid and colloidal sediments;
   

• Economic advantage given the typology that demands reduced volumes;
   

• Continuous treatment of elevated points of industrial toxic cargos with low concentrations of dissolved organic substances;

• The crude sewage water comes mixed with the sludge in a primary section called the contact or mixing compartment, where limited aeration and mixing happens. In this first phase flakes of active sludge capture a much higher part of solid suspended sediments and colloids and part of those dissolved in the sewage waters.
   

• After the contact phase, the mixture is sent to the sedimentation section;
   

• The sludge that is deposited on the bottom of the sedimentation unit, is sent to a section called recreation or reactivation, where it is subjected to a second oxidation and is re-immersed in the contact section, closing the cycle. In the recreation section, the microorganisms that are present in active sludge ribbons use the substances adsorbed on their surface in order to nourish and develop themselves;
   

• The surplus activated sludge becomes, eventually, more stabilized in one separate section of aerobic digestion.