Pretreatment - Physicochemical Treatment
Catalogue
Pretreatment - Physicochemical Treatment
Why ?
Out of the factory, waste water may hold not only solvents, heavy metals, hydrocarbons... but also toxic compounds.
First a pretreatment is required to hold solid matter and floating waste which could disturb the later treatments.
To get rid off the matter in solution a physicochemical treatment may chemically change the polluting elements that have not been hit by the biological purification.
How :
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PRETREATMENT
Screening: large particles disposal (10 to 40 mm)
Grit removal: grit, sand and stones collection to protect the pumps and to avoid deposits in the pipes.
Fine sieving: in order to remove parts of suspended contaminants, sieving with a mesh openings from 0.25 to 1mm with shaftless screw conveyor and rejection compacting area (depending on the products)
Grease removal: liquid-solid separation of the greasy particles using aerated or dissolved air flotation degreaser. This process is to remove most of the contaminants that are not biodegradable as they are (especially food industry effluents).
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PHYSICOCHEMICAL TREATMENT
Coagulation: colloidal particles removal which often causes turbidity hence the colour of the effluent. By adding coagulants this process stabilizes the colloidal suspension.
Flocculation: flocculating agents cause the particles to clump together into largerparticles called flocs that will quickly settle.
Phosphorus removal: this is achieved by chemical reaction (simultaneous precipitation, tertiary treatment) depending on your rejection standards
