Aerobic Treatment Technology

Under conditions of continuous artificial aeration, purification is carried out by a specialized biocenosis of microorganisms—activated sludge containing simple aerobic bacteria and some more highly organized organisms.
Activated sludge in aeration tanks can exist in a free state—as in traditional aeration tanks—or in an immobilized state—in an MBBR reactor with Aqwise AGAR movable biomass carriers, which significantly increases the sludge concentration per unit volume.
Key advantages of aerobic treatment in an MBBR reactor:
– reduced size of treatment facilities;
– increased intensity and depth of wastewater treatment;
– ability to treat more concentrated influent—up to 5,000 mg O₂/dm³.

Up to 90% of organic pollutants are converted into activated sludge, while 10% is consumed by microorganisms for respiration.
The degree of wastewater treatment using aerobic technology is 100%, with significant energy consumption for aeration.
The other stages of the process ensure optimal conditions for the main aerobic stage and achieve maximum treatment efficiency.

Mechanical phase separation and settling methods are used to remove:
— organic and mineral particles ranging from 0.01 to 100 mm;
— sand;
— household waste;
— fibrous impurities, etc.
Up to 70% of contaminants are removed.
The reduction in COD reaches up to 30%.
The mechanical stage stabilizes the flow of wastewater and reduces fluctuations in its volume during subsequent treatment stages.

Separation stage:
— dispersed and emulsified contaminants in wastewater;
— soluble and saturated toxic gases;
— volatile substances.
Includes preliminary treatment of the effluent using pressure flotation and treatment of suspended solids with chemical reagents—coagulants and flocculants.

Ensures the removal of substances that may inhibit or reduce the effectiveness of biological pollution degradation processes in subsequent stages.

COD removal efficiency—up to 15%.

The main stage during which soluble organic compounds and biogenic mineral components—nitrogen (N) and phosphorus (P) compounds—are removed. The process is carried out by aerobic bacteria that are grown and accumulated in activated sludge or on a moving-bed biofilm due to their ability to immobilize on an inert material.
Technical solution: a two-stage MBBR reactor with Aqwise AGAR moving-bed biomass carrier.
An additional stage of post-treatment is achieved using IFAS and AS solutions that utilize activated sludge in a suspended state.

Key performance indicators of the technology:
— COD removal efficiency – 90%
— Effective nitrogen removal
— 75% reduction in excess sludge compared to traditional aerated tanks
— 20–30% reduction in energy consumption for aeration

This stage ensures:

— the separation and minimization of VOC waste;
— the decontamination of effluents;
— the further treatment of byproducts for subsequent disposal or sale.

Separation of 10% of suspended solids in the form of excess aerobic sludge using the following methods:

— clarification in a lamella clarifier or flotation unit;
— sand filtration.

Wastewater disinfection is achieved through UV treatment.
Pasteurization is used for the thickened and solid fractions.