What Is The Enviro H-Series?
AN INTEGRATED STORMWATER DECONTAMINATION SYSTEM
The ‘H’ series is an innovative, world first system capable of removing the full spectrum of pollutants from stormwater (run-off).
Its unique multi-zoned configuration means that the whole spectrum of pollutants are separated into different chambers depending on their properties as water passes through the main chamber. As an example, plastic bottles and polystyrene that typically float to the surface are captured in one chamber while heavier sediment and wetted foliage are separated into other chambers. Oil is also skimmed off into another chamber. These captured contaminants remain in the chambers for periodical removal and disposal. The nominal service interval is 12 months except in the case of a large oil spill that may trigger oil sensors. All Enviro devices are in line with the stormwater drain. All chambers are designed to resist hydraulic uplift.
In addition to meeting the latest environmental standards, the ‘H’ series is delivered as a complete unit to the site ready for installation. The ‘H’ series unique processors are housed inside a reinforced concrete chamber that is fitted with safe lifting points for handling directly into the excavation. There is no requirement for a concrete base slab, and because the unit is reinforced concrete and rectangular shape back-filling is very simple.
HOW IT WORKS
The Enviro ‘H’ series operates on a multi-chambered multi-zoned configuration that separates and retains trash and litter, sediments and oils from the flow. Treated flow enters the device as one-way flow, preventing captured contaminants from being remobilised and scoured. Inside the processing chambers oils are trapped via a weir system, with emulsified oil droplets coalesced and transferred into the oil retention zone. Quiescent conditions are generated in the lower portion of the device where the sediments heavier than water settle.
Prior to final discharge, water passes along specially developed screens that limit maximum particle size to 500 microns. During this final stage, testing demonstrated reliable capture of particles to below 50 microns.
COMPLIANCE AND TESTING
TESTING IN ACCORDANCE WITH EN 858-1
Testing in accordance with EN 858-1 is accepted as a means of determining the suitability of a device to separate oil from run-off water internationally. To qualify for acceptance under this standard, a device must be submitted for testing by an accredited third party. In essence, free light oils are dosed into the device for an extended period of time after which discharge (effluent) water samples are taken and submitted for testing by an accredited laboratory. Compliance is achieved if the presence of hydrocarbons is determined to be less than 5 ppm.
Enviro submitted a full-scale ‘H’ series device for testing by University of South Australia (Uni SA). The Research and Development (R&D)/testing facility is owned by Enviro Australis and located at North Edinburgh South Australia. This test facility is able to replicate conditions that may be experienced during typical storm events.
Testing procedures were prepared and conducted by Dr Baden Myers, Research Fellow, Australian Flow, Management Group from the School of Natural and Built Environments, University of South Australia.
Samples were delivered to Australian Laboratory Services (ALS), a NATA accredited laboratory. Of the five samples tested the highest presence of hydrocarbons was 5.92 ppm with the average being 4.1 ppm. These results are well inside the maximum allowed in accordance with the testing protocol.
When the results of these tests are combined with full-scale testing previously carried out at Manly Hydraulics Laboratory (MHL), compliance with the following reduction targets is claimed:
- Gross Pollutants 90%
- Total Suspended Solids (TSS) 85%
- Total Phosphorous (TP) 65%
- Total Nitrogen (TN) 45%
- Hydrocarbons (Class 1) 99.95%
The Enviro ‘H’ Series is optimised to increase internal performance, within a minimum-sized chamber. The result is low installation cost.
For more details on installation requirements please contact us for a technical specification.
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