OFFLINE TREATMENT OF STORMWATER RUNOFF
Material:
Offline treatment of stormwater runoff sized in accordance with Lombardy Regional Law n°62 of 27th May 1985 consisting of underground modular tanks in LLDPE produced by rotomoulding and PVC pipes. The plant includes a flow splitting chamber, a modular storage system/grit separator with automatic shut-off valve and timed submersible pump, a grit and an oil separation system with coalescing filter sized according to UNI-EN 858-1 and complying with the requirements of D.lgs 152/2006.
Use:
Treatment of stored stormwater runoff from impermeable areas with presence of mineral oils, hydrocarbons and heavy sediments coming from vehicules parks placed in industrial and residential areas as well as service stations.
Application:
the runoff water coming from impermeable transit areas flow to the treatment system, which is sized to treat the first 5 mm of rainfall. Once the storage tank has been filled, a shut-off valve activates the bypass which sends the secondary and not-polluting rainwater to the storage tank. The stored and polluted rainwater is evacuated by a submersible pump controlled by an electric panel that regulates the emptying of the storage tank in such a manner that 48/72 hours after the rainfall, the system is ready for a new operating cycle. This step is required in order to avoid overloading the urban drainage system and to ensure that only the rainwater producing a potentially polluted runoff flow is treated. The runoff water is consequently sent to the grit and oil separators. The last stage of the treatment is defined according to the discharge: a gravity oil separator is foreseen in case of a public sewer, while in case of a surface watercourse the treatment plant consists of a coalescing filter oil separator.
Installation: please strictly follow the “installation instructions” provided by Rototec.
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