Wastewater vary greatly depending on composition and origin of localities and industries. For this reason, to give solutions for wastewater treatment is necessary to use different technologies.
All technologies used then for the following conditions
It refers to the technology where biological treatment is done in the absence of free oxygen. They are characterized by low energy consumption, ease of operation, the effective odor control and hydraulic performance.
It refers to the technology where biological treatment is done using the free oxygen found in the environment. Require intensive energy use for equipment makers to provide the necessary aeration levels.
Ideal for treatment of wastewater with significant concentrations of phosphorus and nitrogen where anaerobic technology is insufficient.
The combined technologies are used in special cases where the requirements of organic load removal are more stringent or where anaerobic technology by itself is insufficient. In these cases the physical-chemical system is used as a complement to an anaerobic system leading to efficiencies above 95% in all control parameters. The physical system is made with the chemical plant model of integrated water treatment.