PREFABRICATED MANUAL COLUMN FILTER
The purpose of DEPOFIL plants is to bring efficient meteoric water treatment solutions to car washes and workshops concerned with modest amount of waste.
The plants are conveniently inserted into prefabricated tanks, available in different sizes according to the volume of the waste subjected to the treatment.
Meteoric water is first caught from a screening system and then collected by gravity from a lifting tank. Later a submersible pump, specific for waste water containing high level of suspended solids, draws the water out from the tank and moves it to the filtration system. This last consists in a column of granular activated carbons whose diameter is 400 mm and whose height is 1000 mm. Activated carbons adsorb pollutants from water, particularly surfactants and oily substances. Activated carbons have small and low-volume pores that increase the surface area available for adsorption. Due to the high degree of microporosity, activated carbons suit the purpose of removing organic compounds from effluents. Activated carbons efficiency is stated by the so called activate carbon saturation curve. The gradually loss of adsorptive capacity from activated carbons depends on the kind of wastewater treated. Back-washings by clean water are periodically required in order to both blend the carbons contained in the filter and remove the impurities that have been retained from them.
The back-washing water will be collected into a settling tank.
After the treatment, the treated water is sent to the inspection chamber located outside the area, then moves to the public sewerage system by gravity.
A branch arranged above the inspection chamber inlet enables the extraction of the effluent samples required for chemico-physical analysis finalized at rating the treatment performance.
Maintenance operations will be periodically executed on the basis of the kind of waste water subjected to the treatment. The maintenance operations will be arranged and scheduled after the plant start-up.
- Filter back-washing
- Replacement of the carbons (at least once a year)
REQUIRED CONSTRUCTION WORKS
The advance construction works required for the plant installation are on the Customer charge:
- Primary oil separation and desludging tank (optional)
- Sewage receiving and lifting tank
- Basement (including outlets for both treated water and counter-washing one)
- Connections to the public sewer system.