The floc is the ecological and structural unit of the active sludge from which the biological purification process is carried out, which is part of the secondary treatment of WWTPs.
One of the most important phases of urban wastewater treatment happens in the biological reactor, where the active sludge process takes place.
The effluent that reaches the reactor carries with it organic matter, bacteria and protozoa that, due to the change of the conditions due to the supply of oxygen, give rise to the formation of flocs. Flocs are suspended solids that can be easily removed.
What does flocculation mean?
The water flocculation process, in the secondary treatment of wastewater, is a chemical process that aims to agglutinate the colloidal substances in the water forming thicker flakes called flocs.
The objective of the formation of these flocs or aggregates of particles is to facilitate their later elimination, either by filtration, sedimentation or flotation.
To favor the formation of flocs there should be added chemicals called flocculants.
Some of the most used flocculants for water treatment are salt iron and aluminum.
Wastewater treatment: Biological process
This wastewater treatment plant applies a biological process of activated sludge under the modality of oxidation ditch, with sludge treatment by aerobic digestion and dehydration with filters and band of polishing systems with multimedia filter.
The treatment station (WWTP) works in five stages: pretreatment (grids, sand trap, regulator), primary treatment, secondary treatment (biological), polishing with multimedia filters and disinfection, in addition to the stabilization of the generated sludge.
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