Biological Treatment

Biological Treatment

Biological processes are most important unit operations in wastewater treatment. Biological treatment systems are living systems that rely on mixed biological cultures of bacteria and fungi to break down waste organics and remove them from solution. A treatment unit provides a controlled environment for the desired biological process.

Aerobic techniques transform the organic pollution into carbon dioxide and biomass. This biological process requires oxygen, which can be provided by either surface or submerged aeration.

As a function of the wastewater to be treated, FARAN Process and Energy Engineering Company selects the most appropriate technique, such as activated sludge treatment (Conventional, Extended aeration, ….) or fixed biomass reactor (tricking filter and rotary biological contactor).

In case low discharge standards are to be met, or for the purpose of recycling, a post treatment (by means of filtration, disinfection, sulphide oxidation….) may be needs after the biological treatment.

Anaerobic techniques use bacteria (in the absence of oxygen) to eliminate the organic pollution in wastewater and are also used to relieve existing aerobic plants, such as when extending the production.

During this process, biogas is generated, which can be used as fuel for steam, hot water or electricity production.

Other advantages of the anaerobic techniques are: the compactness, the moderate operating costs and especially the extremely low excess sludge production, which can even be sold as for instance seed sludge for other customers.

In the anaerobic field, FARAN´S expertise allows us to select the optimum reactor type for each wastewater.