Gross Pollutant Traps

Gross Pollutant Traps (GPT) Improve Water Quality

Removing gross pollutants from storm runoff before it enters the waterways is a key element of maintaining water quality in a community. Once gross pollutants, such as litter, debris, and food matter, have been washed into the waterway, they pose a serious threat to the ecosystem. Adopting a gross pollutant trap is an easy and cost-effective way to prevent a large amount gross pollutants from entering waterways. This can also help to preserve habitats for aquatic and land wildlife, as well as removing temptations for vermin.

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What is a Gross Pollutant Trap?

Gross pollutant traps are devices installed as part of the drainage network to capture pollution before it can enter the waterway. Pollution is retained within the device until maintenance takes place.

There are a few brands and types of GPTs which all function differently. The most recognised and efficient type is a “vortex style” GPT whereby inflow is diverted such that flow creates a swirling motion within the device. There are also dry and wet sump GPT’s, the difference being whether the device permanently holds water or not.

Some possible pollutants that will be captured are:

  • Domestic plastics and polystyrene,
  • Industrial packaging
  • Metals, such as aluminium cans
  • Plastic bottles
  • Paper, including cigarette butts
  • Organics, such as grass clippings and leaf matter

This is important considering sediment can cause the water body to be cloudy, interrupting photosynthesis and killing plants. Decaying green matter depletes the oxygen in the water, starving plants and fish. Particulates can also clog the gills of fish. As other materials break down, they can introduce toxic chemicals into the water as well.

How does a Gross Pollutant Trap Work?

All GPTs serve a similar purpose: to remove large pieces of litter and particulate matter from the water system. Dry traps store collected waste above the water line, while wet traps store loads below the water line. Dry traps are generally less expensive to operate.

A gross pollutant trap may screen sediment out of the water, some can manipulate velocity in order to let waste be separated, or use both sedimentation and flotation.

What environments are Gross Pollutant Traps designed for?

A gross pollutant trap can be used as a standalone device but is also often used as pre-treatment to a secondary treatment system such as a proprietary cartridge filter, a pond or wetland. In many cases by using a GPT the community or asset owner benefits by owning a properly functioning treatment system, reduced maintenance costs by not having to re-build the downstream secondary treatment system but as important also ends up inheriting an aesthetically pleasing waterway. Any urban area can benefit from a gross pollutant trap, however they may also be used in areas where debris can enter the waterway through stormwater grates, or in communities where grass and leaf material is likely to be swept out with storm water. Some of the most common gross pollutant traps in Australia are trash racks installed in drainage channels, standard screening and vortex style screening devices. A range of GPT’s commonly referred to as Hydrodynamic separators also retain harmful pollutants such as hydrocarbons, heavy metals and a finer range of suspended solids.

For communities looking for gross pollutant traps in Australia, Stormwater360 offers a wide range of options to maximize the effective removal of gross pollutants and the associated contaminants from storm water flows. By removing litter, debris, and some suspended solids and hydrocarbons from runoff, we help communities protect their water quality for years to come.

Both the hydrodynamic and screening gross pollutant trap products offered by Stormwater360 operate successfully for a range of typical flow rates. Our gross pollutant traps are reliable, easy to install, and offer high performance pollutant removal with proven success. You can also choose options, which will assist with either pretreatment or retrofit targeting litter, oil, or sediment loads. With many years of expertise in the field, Stormwater360 is ready to help you find the right gross pollutant trap for your community's needs. Take the necessary steps today to improve water quality, reduce the load on water treatment facilities, and protect important wetlands and wildlife habitat. Contact Stormwater360 to learn more about your gross pollutant options today.

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