Gazebo Bath, cistern and tank for water system

Purification and disposal system

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Bath, cistern and tank for water system


Purification and disposal system

The system is designed to:
- separate the first flush rainwater from later rainfall (second flush) on the surface,
- treat the collected water using an oil separation system with a coalescence filter,
- dispose of it after purification.
The treatment cycle consists of the following stages: settlement, harvesting and pumping of first flush rainwater, oil separation and coalescence filtering.
The first flush water is separated from the second flush water by closing the valve on the water inlet pipe which is controlled by a float set at an appropriate level.
The calm conditions inside the tank allow the pollutants with a different specific weight to that of the water to separate by gravity. This is one of the most commonly used processes in wastewater treatment in order to obtain clarified effluent.
The collected water flows into the pumping-lifting chamber and is discharged into the static oil separation chamber by means of a submersible motor pump.
To further purify the water, the clarified liquid mass is channelled through a special adsorbing coalescence filter which removes any traces of oily substances.
An automatic floating closing device (shutter) is fitted on the outlet pipe which, when the light liquid accumulated on the surface reaches a certain level, closes the outlet channel, preventing the oil from spilling out.
Supplied as standard
The Gazebo First Flush Rainwater Harvesting Plant is fitted with:
- floating closing valve,
- submersible motor pump to pump the treated water with electric control panel,
- rain sensor,
- automatic floating shutter in AISI 304 stainless steel set for light liquids, fitted with a removable coalescence filter in open cell expanded polyurethane.

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