Aerobic techniques transform, by means of aeration, the organic pollution into carbon dioxide and biomass. They require oxygen that is taken from the air or injected as such.
Beside the BOD removal, aerobic plants can be designed to eliminate the ammoniacal nitrogen and the oxidized nitrogen (de-nitrification) and the phosphates (de-phosphatation).
According to the type of wastewater to be treated, TDFC selects the most appropriate technique, with or without carrier material: fixed biomass, activated sludge (conventional type, sequential batch reactor, contact type, step-feed type), etc.
In case of industrial wastewater with high organic load, TDFC has recently improved its experience in the membrane bioreactor (MBR) technology. This technology achieves extreme biology conditions (high pollutants removal efficiency) and very high effluent quality (complete removal of suspended solid).

Anaerobic techniques (in absence of oxygen) to eliminate the organic pollution. During this process, biogas is generated that can be used as fuel. Other advantages of the anaerobic techniques are: the extremely low excess sludge production (up to 10 times less than the aerobic plant), the moderate operating costs, and the compactness.

Anaerobic techniques allow for treating wastewater with a high organic load. They are also used to relieve existing aerobic plants, such as when extending the production.

In the anaerobic field, TDFC can propose different reactor types, based on its long experience: form the compact UASB to the multipurpose UACF, an hybrid type improved by TDFC providing a more stable treatment and a final effluent of higher quality. For some complex wastewater, the hybrid systems are the only feasible anaerobic solution.

This kind of treatment removes pollutants (such as suspended solids, metals, emulsions and color) through chemical reactions of coagulation and flocculation. The objective of the chemical-physical treatment is to change the state of the pollutants in the water into a form easy to be separated. Chemical addition causes the clumping of the particulate pollutants (such as turbidity particles, emulsion agents, etc.) into larger particles. Inorganic sludge is easily separated from treatment water by a setting unit.

Beside the common chemicals as lime and aluminum & iron salts, TDFC proposes other products specific for the application and the wastewater to be treated. TDFC also designs Fenton oxidative treatment plants, with strong chemical degradation obtained through H 2 O 2.

TDFC proposes techniques that allow for the removal of the suspended solids (organic as well as inorganic) from the water and for the refining of the treatment process in order to achieve a final fine-removal of the pollutants. These techniques are high-pressure sand filtration and carbon-activated absorption towers.

Sand filtration occurs under high-pressure on a multi-layer filter bed. Filtering media specific for each layer assure complete removal and easy backwashing operation. The system is completely automatic and self-cleaning, in order to guarantee the highest operational reliability.

For further removal of organic pollutants, TDFC employs absorption towers. In these devices organic compounds are absorbed by the surface carbon granules and thus removed from the water.