Ecosol In-Line GPT

The EcosolTM GPT (in-line/end-of-line primary treatment solution) is a non-blocking tangential screen filtration system that captures and retains 99% of pollutants larger than 211μm and 90% of particles larger than 152μm at its designed TFR.

Primary Treatment

The EcosolTM GPT (in-line/end-of-line stormwater treatment solution) is a non-blocking tangential filtration system. Two unique systems have been designed, the Low Flow EcosolTM In-Line GPT for primary and secondary treatment of stormwater at low flow velocities and the High Flow EcosolTM In-Line GPT for primary treatment of stormwater at high flow velocities.

Key Features

The High Flow EcosolTM GPT (formerly known as the RSF 4000 Solid Pollutant Filter) captures and retains more than 99% of pollutants larger than 2mm and the Low Flow EcosolTM GPT up to 80% of Total Suspended Solids, as well as 45% of Total Phosphorous and Total Nitrogen at its design TFR.

Easily installed, the pre-cast, modular GPT’s can be fitted to conduits of almost any size and shape, either within the drainage network or off-line adjacent to creeks or in open channels in-line and end-of-line in drainage networks. Its range of applications include industrial and commercial sites, such as car parks, shopping centres, and wash-bays, residential developments, airports, freeways, civil construction projects, and wetlands.

Ecosol-inline-GPT-01 in-line gpt Ecosol In-Line GPT GPT Key Features Table R1 2015

1 Larger EcosolTM GPT’s may come in multiple parts.

Low Flow Ecosol GPT - Key Features

Ecosol In-Line GPT cleaning and maintenance in-line gpt Ecosol In-Line GPT Ecosol In Line GPT 2The Low Flow EcosolTM In-Line GPT has been designed and tested specifically to treat low flows to capture and retain fine suspended solids and hydrocarbons fromstormwater. Its tangential screening along with its large detention chamber enables gravitational separation to occur at low flow velocities retaining fine particulate matter conveyed in stormwater providing essential primary and secondary treatment.

Key Features

  • high capture efficiency of suspended solids at low flow velocities
  • designed high flow by-pass capacity
  • Independently tested and verified by the University of Adelaide
  • designed hydraulics provides minimal hydraulic headlosses
  • shallow depth below invert reduces water table problems
  • visually unobtrusive
  • easily cleaned using eductor truck or removable lift out baskets
High Flow Ecosol GPT - Key Features

The range of High Flow EcosolTM In-Line GPT’s, are designed specifically to provide essential primary treatment of gross pollutants conveyed in stormwater at high velocities. Typically this system has been designed to capture and retain more than 99% of pollutants larger than 2mm.

Ecosol - GPT in-line gpt Ecosol In-Line GPT Ecosol GPT 12 resized2Key Features

  • minimal head/hydraulic loss
  • hydraulically-driven barrier reduces premature by-pass
  • designed hydraulics enables high treatable flow rates
  • shallow depth below invert reduces water table problems
  • visually unobtrusive
  • Independently tested and verified by the University of Adelaide
  • easily cleaned using eductor truck or removable lift out baskets
Applications

Ecosol - GPT in-line gpt Ecosol In-Line GPT photo10 resizedThe EcosolTM In-Line GPT systems are typically installed on industrial and commercial sites, such as car parks, shopping centres, and wash bays. It is also suitable for residential developments, airports, freeways, and most civil construction projects.

Key to its success is the unique design element that forces a proportion of the filtered water back upstream along the bypass channels and against the main directional flow. As this water meets the flow entering the inlet to the capture silo, a hydraulically-driven barrier is created, helping ensure all flows up to the unit’s TFR are directed into the capture silo, thereby enhancing considerably the unit’s capture efficiency.

The EcosolTM In-Line GPT systems suit conduits of almost any size and shape, within the drainage network or end-of-line. It is available in 11 different sizes to treat piped flows ranging in diameter from 100mm to 2400mm.

Hydraulics

Ecosol - GPT in-line gpt Ecosol In-Line GPT Ecosol GPT 17 resizedThe EcosolTM In-Line GPT systems are sized to treat between a 1:1 year to 1:3 month ARI. In addition to high treatable flow rates the unit has one of the lowest k factors of any GPT currently available.

Extensive independent testing has been carried out to confirm the unit’s k factor for a range of pipes and unit sizes based on full flow, worst-case scenarios. These tests show that the k factor can vary between 1.2 and 1.8 depending on the pipe configuration and the unit size.

Cleaning and maintenance

The EcosolTM GPT’s simple design makes access for cleaning and maintenance easy using an eductor truck or crane truck for removable basket configurations. This eliminates any manual handling risks. The cleaning frequency depends on the catchment type and size but, as a guide, a unit serving a 17Ha residential catchment will need cleaning about twice annually.

 

Key Dimensions

The table below shows the approximate dimensions and holding capacities for both, the low and high flow EcosolTM GPT systems. Their capacity to retain large quantities of captured pollutants ensures that its specified capture efficiency is maintained between scheduled cleaning events.

 
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Notes
1. The unit can be sized to suit almost any type of pipe or box culvert.
2. Unit dimensions can vary depending on the vehicle load requirements and the wall thickness.

The EcosolTM GPT is available in three configurations:

  • In-line/End of Line, Low Flow EcosolTM GPT
  • In-Line/End of Line, High Flow EcosolTM GPT and
  • Off-Line EcosolTM GPT.

For full details on the performance of the off-line Ecosol GPT please refer to that product section in our website.

Life Expectancy
The EcosolTM GPT is designed to meet the strictest engineering guidelines. The reinforced concrete has an expected life span of 50 years while the internal filtration components, comprised of 304 or 316-grade stainless steel, have a life expectancy of between 10 - 15 years. Some suppliers, using the same materials as Ecosol, often quote substantially longer life expectancies for their internals. Ecosol prefers to take a more conservative approach and only quote life expectancies based on the manufacturer's recommendations.

 
 

Unit Design Basis
This quotation is based on Exposure Classifications A2 for external surfaces in contact with the ground and for installations in non-aggressive soils. Where the conditions are outside the design limits of the standard EcosolTM GPT, Ecosol must be notified in writing so that the product is quoted specific to these site conditions. This includes instances where the unit is to be installed in aggressive soils, or below any permanent, or transient water table, or if the maximum depth of fill above the cover slab exceeds 3.0m for EcosolTM GPT 4300 - 4600 and 2.0m for the EcosolTM GPT 4750. Confirmation of the site ground and water conditions including cover is the responsibility of the client.

Unit Design Loading
The range of EcosolTM GPT's are designed for Class B, D and up to Class G loadings suitable for underground installations in highways, airport and wharf applications.

Ecosol Inline GPT DimensionsEcosol-inline-GPT-deliveryEcosol-inline-GPT-delivery

 
 

Collection Efficiencies

Particle Size Distribution Collection Frequency
In order to determine a meaningful characterisation of the products collection efficiency, an extensive verification phase (inclusive of field and laboratory testing) was undertaken by Avocet Consulting Pty Ltd, EcosolTM Pty Ltd and EngTest (The University of Adelaide). To best summarise the capture efficiency results of extensive product testing a regression of the data points using a sigmoidal regression curve was selected as it provided a conservative fit to the wide scatter of data collected. Refer to figures 1 and 2 for testing results. Table 1 summarises these results.

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Table 1- Typical PSD results.

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Figure 1 – Sigmoidal regression curve graph for Low Flow EcosolTM GPT laboratory testing.

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Figure 2 – Sigmoidal regression curve graph for High Flow EcosolTM GPT laboratory.

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Figure 3 - Field testing Particle size distribution data for six separate High Flow EcosolTM GPT installations.

Gross Pollutant Traps (GPTs), such as the EcosolTM GPT, are primarily designed to remove larger gross pollutants (>3mm) from stormwater at high treatable flow rates (TFR) and can play an integral role reducing pollution in heavily-urbanised catchments that discharge into our waterways.

In recent years modern Water Sensitive Urban Design (WSUD) objectives and principles now applied to most urban development’s require more onerous water quality objectives (WQOs) specifically targeting the removal of suspended solids, nitrogen, phosphorus and heavy metals. Subsequently EcosolTM designed and developed a Low Flow EcosolTM GPT specifically designed to remove these constituents at low treatment velocities.

Since development of the EcosolTM GPT began in 1996, EcosolTM has commissioned a range of tests to confirm not only product performance but also to help with further research and development work. In 1996, the University of South Australia, a National Australian Testing Authority (NATA) approved testing body, tested EcosolTM GPT's to review pollutant capture efficiencies and also hydraulics. Further testing in 2000 and again 2012 by the University of Adelaide provided further measurements of the products capture efficiency at varying flow rates obtained from both field and laboratory testing data. The below tables summarise their findings for both the high and low flow EcosolTM GPT's.

Low Flow EcosolTM GPT - Capture Efficencies

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Table 2 – Low Flow EcosolTM GPT performance summary.

High Flow EcosolTM GPT - Capture Efficiencies

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Table 3 – High Flow EcosolTM GPT performance summary.

The above capture efficiencies have been independently verified by laboratory and field tests confirming that the EcosolTM GPT plays an integral part in the treatment train necessary to achieve generally-accepted stormwater treatment objectives and WQOs.

Figures quoted are mean collection efficiency statistics based on available product testing data. It is important to note that the water quality CE values are indicative of potential field CEs given that product is designed primarily as a primary treatment solution providing physical screening and the removal of chemical constituents is largely dependent on the chemical composition of the particles and the bonding of these chemical constituents to the surface of particles. Further, finer and attached particle filtration performance of the product is also dependent on the body of pollutants forming a media already captured by the filter. Quoted CE values are intended as a general guide, please consult with your Ecosol representative for site specific product sizing and modelling.

 
 

Hydraulic Specification

Treatable Flow Rate

Gross Pollutant Traps (GPTs), such as the EcosolTM GPT’s, are primarily designed to remove larger gross pollutants (>3mm) from stormwater at high treatable flow rates (TFR) and can play an integral role reducing pollution in heavily-urbanised catchments that discharge into our waterways.

In recent years modern Water Sensitive Urban Design (WSUD) objectives and principles now applied to most urban development’s require more onerous water quality objectives (WQOs) specifically targeting the removal of suspended solids, nitrogen, phosphorus and heavy metals. Subsequently EcosolTM designed and developed a low flow GPT specifically designed to remove these constituents at low treatment velocities.

Since development of the EcosolTM GPT began in 1996, EcosolTM has commissioned a range of tests to confirm not only product performance but also to help with further research and development work.

In 1996, the University of South Australia, an approved testing body, tested Ecosol'sTM GPT to review pollutant capture efficiencies and also hydraulics. Further testing in 2000 and again 2012 by the University of Adelaide provided further measurements of the products capture efficiency at varying flow rates obtained from both field and laboratory testing data. The below tables summarise their findings for both the high and low flow EcosolTM GPT’s.

Low Flow EcosolTM GPT - Capture Efficiency and Treatable Flow Rates

The TFR is the minimum flow that a GPT must treat, without by-pass, to achieve the desired pollutant capture criteria for a particular development style and catchment area. It varies dependent on pipe size and gradient. Typically, the Low Flow EcosolTM GPT is designed to treat flows between 1-in-3 month and 1-in-1 year Annual Rainfall Intensity (ARI) discharges, with greater flows by-passing the unit.

The Low Flow EcosolTM GPT was designed specifically to achieve high pollutant removal rates at low inflow velocities thereby providing improved gravitational separation of particulates conveyed in stormwater. The table below summarises the Low Flow EcosolTM GPTs performance.

Ecosol-inline-GPT-09

 
 

Below are the TFRs (shown as litres/second) for the most typical EcosolTM Low Flow GPT’s, although the TFR can be altered to suit site-specifics. Please contact your Ecosol representative for help in sizing a unit to cater for a particular TFR.

Ecosol-inline-GPT-10

 
 

The above Low Flow EcosolTM GPT figures are a general guide only. Please consult with your local Ecosol representative for accurate flow calculations specific to your site.

High Flow EcosolTM GPT - Capture Efficiency and Treatable Flow Rates

The High Flow EcosolTM GPT's, are primarily designed to remove larger gross pollutants (>3mm) from stormwater at high treatable flow rates (TFR) and can play an integral role reducing pollution in heavily-urbanised catchments that discharge into our waterways.

The range of High Flow EcosolTM GPT’s designed to provide essential pre-treatment of stormwater at high velocity flows and is therefore an integral part of any treatment train. The table below summarises the High Flow EcosolTM GPTs performance.

Ecosol-inline-GPT-11
 

 
 

Below are the TFRs (shown as litres/second) for the most typical High Flow EcosolTM GPT’s, although the TFR can be altered to suit site-specifics. Please contact your Ecosol representative for help in sizing a unit to cater for a particular TFR.

Ecosol-inline-GPT-12

 
 

By-pass Capacity and Headloss

The range of EcosolTM GPT's has been designed to cater for maximum flow by-pass at minimal headloss. The placement of any structure into a stormwater line will induce headloss. The extent of this headloss is a function of the velocity in the outlet pipe and the k factor adopted. The k factor must be representative of the type of structure and its operation during full-flow conditions as distinct from the TFR.

The EcosolTM GPT has one of the lowest k factors of any GPT currently available. Extensive independent testing has been carried out to confirm the unit’s k factor for a range of pipe and unit sizes based on full flow, worst-case scenarios. These tests show that the k factor can vary between 0.6 and 1.5 depending on the pipe configuration and the relative unit size, as shown below.

 
 

Low and High Flow EcosolTM GPT – Headloss Measurements

Measured maximum k factors for the EcosolTM GPT at the suggested treatable flow rates for non-surcharged flows.

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The graph below provides a measured maximum k factors for the EcosolTM GPT at its designed maximum by-pass flow rate (designed discharge flow rates) in a surcharged environment.

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  Notes
Dp = Outlet pipe diameter.
Dn = Nominal unit pipe diameter (e.g. the nominal pipe diameter for an GPT 4600 is 600mm).
 
 

Maintenance

As with all filtration systems, the EcosolTM GPT should be inspected and cleaned regularly. The cleaning frequency, and the cost, depends heavily on the catchment size and type, the unit’s proximity to a waste facility, and rainfall.

The cleaning frequency may vary with local catchment conditions but the below figures are based on typical gross pollutant loads expected for typical commercial, residential, and light industrial catchments and provide a broad guideline about the catchment size and the number of cleans required annually. Gross pollutants include vegetation as well as anthropogenic litter but exclude sediment. The figures give consideration to the volume of pollutants in the unit and to eductor truck holding capacities and cleaning costs for a fully-loaded truck. In some instances, it may be cheaper to clean a unit more frequently than undertaking, say, annual cleans where the volume requires more than one truck load.

One of the key advantages of the EcosolTM GPT is that it can be designed for cleaning by either vacuum (eductor truck) or removable basket (crane truck) method.

 
 

Catchment Size and Recommended Cleaning Frequency

The tables below provide a broad guideline about the catchment size and the number of cleans required annually.

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Table 1 – Low Flow EcosolTM GPT recommended maintenance program.

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Table 2 – High Flow EcosolTM GPT recommended maintenance program.

1 Cleaning frequency is based on typical gross pollutant loads anticipated for standard commercial, residential and light industrial catchments. Gross pollutants in this instance includes vegetation as well as anthropogenic litter, however excludes sediment. Cleaning frequencies may vary based on local catchment conditions and rainfall.

EcosolTM has a very competitive cleaning service. After each clean we provide a report detailing the volume and type of pollutants removed. We believe that it is in your best interests for EcosolTM staff to clean and maintain the unit, not only because we are specialists, but also because proper monitoring and maintenance enhances the unit life significantly. Should you use another company to clean the unit, or undertake this work yourself, we request that it be conducted according to Ecosol'sTM specifications. Otherwise, you may invalidate your warranty, as damage caused by inappropriate cleaning procedures is not covered. The advantages of using EcosolTM to clean and maintain your unit are that you get:

  • regular inspections of your unit
  • a comprehensive cleaning service with removal and disposal of all captured pollutants
  • a detailed report provided on completion of each clean
  • trained and experienced staff; and remedial work completed, if required.
 
 

Applications

Most major road infrastructure is designed using Water Sensitive Road Design (WSRD) guidelines to achieve an annual pollutant load reduction. Run-off from roads may contain contaminates such as petroleum-based products, organic compounds, and rubber products to name a few. WSRD encourages a treatment-train approach to achieve the desired water quality objectives and recognise the importance of GPTs for pre-treatment controls so that secondary and tertiary treatment measures such as wetlands, bio filtration basins, and sediment basins work more effectively. Spill containment is also an important element of a highway design. The diagram opposite shows how the EcosolTM GPT and EcosolTM Spill Containment Unit can be incorporated into this type of treatment train for maximum effect.

Wetlands, such as that shown opposite, are an integral part of the treatment train providing tertiary treatment of stormwater flows by removing sediment, reducing bacterial contamination, and dissolved contaminant loads and trapping nutrients in reed beds. They also enable infiltration, and reduce the flow velocity of stormwater runoff. By design all wetlands require primary treatment as they cannot cope with large volumes of gross pollutants. An EcosolTM GPT located upstream of the constructed wetland, will provide essential primary treatment to remove both particulate bound and soluble pollutants, including some forms of nutrients and is, therefore, an effective prescreening system for wetland designs.

The EcosolTM GPT in the application shown opposite is designed to remove gross pollutants, coarse sediment and associated pollutants at high flows from the drainage network prior to entering the on-site rainwater harvesting and re-use storage tanks. The EcosolTM GPT efficiently pre-screens gross pollutants, sediment and some forms of nutrients thereby improving the quality of the water stored for re-use in the downstream storage tanks.

In recent years, EcosolTM has successfully designed and installed the EcosolTM GPT in various ports. As shown opposite, the unit can be installed suspended under a wharf. Stormwater flows form the surface of the wharf enters the unit from above and, then after being treated, discharge into the sea. The unique hydraulic operation and rectangular shape of the EcosolTM GPT, and its tangential screening, makes it one of the few proprietary GPTs that can be used in such an application.

 

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Ecosol GPT Installation Guides


EcosolTM GPT 4200 - Installation Guide


EcosolTM GPT 4300 - 4450 - Installation Guide


EcosolTM GPT 4600 - Installation Guide


EcosolTM GPT 4750 - 4900 - Installation Guide


EcosolTM GPT 4900B - 41050 -  Installation Guide


EcosolTM GPT 41200 - 41800 - Installation Guide


 

Ecosol GPT Maintenance Guide
 

EcosolTM GPT - Maintenance guide



Ecosol In-Line GPT Technical Specifications
 

EcosolTM In-Line GPTTechnical Specifications

 


Ecosol GPT Inline Interactive PDF
 

EcosolTM GPT - Interactive PDF - Interactive 3D product drawing - the attached file allows the viewer to zoom in on the product, rotate the product and to view the product and components from all angles. Please note: This is a large file (24mb)

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