Treatment of Contaminated Stormwater from Scrap Metal Yards

The accepted industry treatment method for heavy metals management from contaminated site stormwater requires sand/peat media within sandfilter devices. There is no industry standard for scrap metal yards.

For a number of scrap metal yards and car wrecking yards, Hynds Environmental has designed and installed a treatment train that again calls for the sandfilter, but as the final treatment stage. Preceding stages require both point source and end-of-pipe control. Point source in this regard is the capture and removal of oil-based (hydrocarbon) based materials at the vehicle dismantling stage. End-of-pipe relates to treatment of sheet or confluent site stormwater.

The Hynds Smart Sponge is proposed for elimination of hydrocarbons at source from contaminated site stormwater. This device can either be installed within cesspits (6L/s), or fitted within existing underground chambers and treating flows up to 12L/s.

The Hynds Downstream Defender is proposed as the first end-of-pipe stage to capture gross pollutants, retain suspended solids, and store oily matter. The subsequent stage is a Smart Sponge vault that captures medium suspended solids and eliminates hydrocarbon products from conveyed flows up to 12L/s. Finally, the sandfilter utilises the preceding devices as sedimentation stages and provides heavy metals management by sand/peat filtration processes. Treated stormwater is then reused at the facility.