BIOLOGICAL AEROBIC REACTORS WITH SUSPENDED BIOMASS
The biological wastewater plants realized by Fidia Engineering are based on the principle of active sludge, from long time in the history and development of wastewater treatment, proving one of the most versatile technologies known.
The plants designed by us are based on modern and consolidated literature, as well as on our experience (since 1980, through the group company, Consulenze Ambientali Spa), and we realize a favorable compromise between minimal installation expense costs and operating costs for our clients.
Following a classical purification cycle, sewage waters are previously subjected to preliminary treatment of coarse and fine screening, with possibly shredding, and desanding. After a possible pre-aeration and de-oiling, wastewater are sent to the primary sedimentation, where the most settleable solids are deposited.
After primary sedimentation, wastewaters are sent to the oxidative phase, where takes place an intense and artificial (oxygen) ventilation. In this phase takes place a chemical oxidation and physical-biological processes, thanks to associated microorganisms that constitute sludge flakes, that agglomerate settleable solids escaped from the primary stage and block non-settleable colloidal solids with adsorption phenomena.
The microorganisms proceed to the processing of compounds captured after solubilization with extracellular enzymes. This process makes settleable compounds that were not settleable before. High microbial concentrations are made possible by sludge recirculation. The Sludge are sent to the secondary sedimentation, which separates the sludge from the effluent purified, for sending they respectively to the sludge treatment and tertiary treatment (sand filters, activated carbon filters, membranes MBR, etc.).