IN-LINE END-OF-LINE PRIMARY TREATMENT SOLUTION
Urban Asset Solutions has also developed a standard modular trash rack system suitable for most stormwater outlet applications. The Ecosol Trash Rack is a robust and modern primary treatment filtration system for use where there are cost or space constraints, or specialised cleaning equipment is not available. The unit captures and retains more than 93% of solid pollutants larger than >2000μm, although, in practice, it has been found to collect much smaller particles, including fine sediments.
Easily installed, the Ecosol Trash Rack’s simple design overcomes any adverse hydraulic impact traditionally encountered with generic, direct screening, trash racks that often block in first flush flows. By incorporating filtration nets into the design its operating life is significantly improved with an increased screening surface area and a larger pollutant holding capacity.
It can be installed not only end-of-line at almost any pipe outlet discharging to beaches, rivers, and creeks but also in-line within open channels.
The Ecosol Trash Rack consists of a structurally engineered stainless-steel frame with support legs and a removable heavy-duty UV-stabilised polyethylene filtration net that can be easily lifted out for cleaning and maintenance using a small crane truck. This overcomes the problem usually encountered with traditional, fixed direct-screen designs, which are often difficult and expensive to clean.
The system has been designed to provide a robust and durable cost effective primary treatment system that captures and retains solid pollutants conveyed in stormwater conduits.
KEY FEATURES AND BENEFITS
- Modular design easily scaled up to suit any size headwall of channel
- Durable, engineered and modelled system that can withstand peak flows without being damaged
- Easily maintained by vacuum truck or crane truck
- Efficiently captures and retains gross litter and vegetation
- Cost efficient integral pre-screening system for downstream secondary and tertiary systems
- Filtration netting available in 50mm and 115mm aperture sizes
At Urban Asset Solutions we can site measure, fabricate, install and maintain your Trash Rack making the whole process seamless.
The Ecosol Trash Rack is usually installed at drainage discharge points prior to the receiving waterway, enhancing not only water quality but also site aesthetics by stopping significant volumes of gross pollutants entering the natural waterway and damaging the existing marine life and vegetation.
The Ecosol Trash Rack is a compact, efficient, and cost effective solution to the ever-increasing problem of water pollution. Key to its success is the robust, engineered structural frame and filtration net that provides a significantly-greater screening area than that of traditional direct-screening trash rack designs.
The table below highlights the key performance specifications for typically-sized single module Ecosol Trash Rack units to suit cylindrical pipes up to 1050mm and for box culverts up to 900mm wide by 900mm high. Figures quoted are for single units – for multi-units multiply the figures by the number of single unit modules required for your site.
Ecosol TRASH RACK KEY DIMENSIONS & FLOW CAPACITIES | |||||||||
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Model Ecosol Trash Rack | Pipe dia. Box Culvert Height (mm)s | Holding Capacity (mm3) | Designed Treatable Flow Rates (L/sec) at grade up to 10% | Designed by-pass Capacity (L/sec) at grade up to |
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0.5% | 1% | 2% | 5% | 7% | 10% | ||||
Cylindrical Pipe Units | |||||||||
ETR 37 | 375 | 0.263 | 65 | 124 | 175 | 248 | 392 | 463 | 544 |
ETR 45 | 450 | 0.379 | 103 | 201 | 285 | 403 | 637 | 754 | 901 |
ETR 52 | 525 | 0.515 | 151 | 304 | 430 | 60 | 961 | 1137 | 1359 |
ETR 60 | 600 | 0.675 | 211 | 434 | 614 | 868 | 1372 | 1623 | 1941 |
ETR 67 | 675 | 0.853 | 282 | 594 | 840 | 1188 | 1879 | 2222 | 2675 |
ETR 75 | 750 | 1.053 | 369 | 787 | 1113 | 1574 | 2488 | ||
ETR 82 | 825 | 1.274 | 468 | 1014 | 1435 | 2029 | |||
ETR 90 | 900 | 1.518 | 582 | 1279 | 1809 | 2559 | |||
ETR 105 | 1050 | 2.065 | 855 | 1351 | 1910 | ||||
Box Culvert Units (600mm wide) | |||||||||
ETR B37 6 | 375 | 0.421 | 228 | 86 | 122 | 173 | 274 | 324 | 387 |
ETR B45 6 | 450 | 0.505 | 299 | 140 | 109 | 282 | 445 | 527 | 630 |
ETR B52 6 | 525 | 0.589 | 377 | 180 | 202 | 230 | 389 | 503 | 612 |
ETR B60 6 | 600 | 0.675 | 461 | 212 | 301 | 425 | 672 | 795 | 951 |
ETR B75 6 | 750 | 0.843 | 644 | 303 | 429 | 607 | 960 | 1136 | 1358 |
ETR B82 6 | 825 | 0.927 | 743 | 415 | 588 | 831 | 1315 | 1555 | 1859 |
ETR B90 6 | 900 | 1.012 | 820 | 550 | 779 | 1102 | 1742 | ||
ETR B120 6 | 1200 | 1.180 | 960 | 709 | 1005 | 1420 | |||
Box Culvert Units (900mm wide) | |||||||||
ETR B37 9 | 375 | 0.632 | 342 | 86 | 122 | 173 | 274 | 324 | 387 |
ETR B45 9 | 450 | 0.750 | 449 | 140 | 109 | 282 | 445 | 527 | 630 |
ETR B52 9 | 525 | 0.884 | 566 | 180 | 202 | 230 | 389 | 503 | 612 |
ETR B60 9 | 600 | 1.012 | 691 | 212 | 301 | 425 | 672 | 795 | 951 |
ETR B75 9 | 750 | 1.264 | 966 | 303 | 429 | 607 | 960 | 1136 | 1358 |
ETR B82 9 | 825 | 1.390 | 1115 | 415 | 588 | 831 | 1315 | 1555 | 1859 |
ETR B90 9 | 900 | 1.518 | 1180 | 550 | 779 | 1102 | 1742 | ||
Ecosol Trash Rack Key Dimensions & Flow Capacities - 2018 |
Ecosol can design, model, install and maintain systems specific to your site. This includes:
- Multiple module Trash Rack Systems
- Designs inclusive of sediment fore-bays for improved retention of coarse sedimentation
- Wing wall/headwall construction
- Hard stand and access ramp for maintenance
- Off-line systems with diversion weirs for high flow open channel applications
- Systems inclusive of overhead hoists for easy lifting and removal of full net modules for cleaning.
At Ecosol we can provide a complete turnkey service with the purchase of your trash rack, including site measure, modelling, structural design, fabricate, installation and maintenance of your Trash Rack system.
In 2012 the University of Adelaide (Engtest Civil, Environmental and Mining) completed extensive testing and measurements of the products capture efficiency, hydraulic performance and durability at varying flow rates its and compiled a comprehensive product performance report (Performance Review of the Ecosol Net Guard) on which the Ecosol Modular Trash Rack Design is based. Testing also included a detailed reviewing of on both past and present field and laboratory testing data in comparison with current testing data to determine meaningful, conservative product performance results.
The results of this extensive product testing and verification phase is summarised in the table below.
Ecosol TRASH RACK CAPTURE EFFICIENCY PERFORMANCE SUMMARY | ||
---|---|---|
Pollutant | Capture Efficiency | Details |
Gross Pollutants (GP) | 93% | Capture efficiency of gross pollutants by volume (larger than the filtration netting apertures). Standard Netting consists of 50mm or 115mm apertures. |
Ecosol Trash Rack Capture Efficiency Performance Summary - 2018 |
Ecosol TRASH RACK SEDIMENT COLLECTION EFFICIENCY | |
---|---|
Particulate Size (Micron) | Capture Efficiency |
2000 – 6000 | 20% |
6000 – 16000 | 48% |
>16000 | 90% |
Ecosol Trash (modular) Rack Sediment Collection Efficiency - 2018 |
In practice and as the filtration net begins to fill with gross litter and vegetation thereby forming a filter media within the net, finer particulate and attached pollutants are also captured.
However it is important to remember that this system has been designed as a cost efficient, easy to maintain primary treatment solution.
As with all filtration systems, the Ecosol Trash Rack should be cleaned regularly. The cleaning frequency, and the cost, depends heavily on the catchment size, type, estimated pollutant loading and rainfall.
The Ecosol Trash Rack can be easily inspected visually to determine whether it needs cleaning. Ecosol recommends the unit is inspected every two months or after any major rain event to determine if it needs to be cleaned.
One of the key advantages of the Ecosol Trash Rack is that a small crane truck can easily lift the individual filtration netting modules for cleaning thereby eliminating any manual handling risks and the need for specialised cleaning equipment. As the unit is a dry system there is a reduced likelihood of captured contaminants causing any significant adverse environmental impact or nuisance (e.g. odours and putrefaction).
Cleaning is recommended before the filtration net reaches its capacity to avoid flows bypassing the system and discharging untreated to the receiving waterway. The figures below give a broad guideline about the catchment size and the number of cleans required annually for single module systems.
Ecosol TRASH RACK CATCHMENT SIZES AND CLEANING FREQUENCIES | ||||
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Product Code | Pipe and Culvert Dimensions | Gross Pollutant Holding Capacities | Optimal Catchment Area (Ha) | Recommended Cleaning Frequency |
Cylindrical Pipes | mm | m3 | Ha | Per Annum |
ETR 37 | 375 | 0.263 | 0.95 | 1 |
ETR 45 | 450 | 0.379 | 1.30 | 1 |
ETR 52 | 525 | 0.515 | 1.80 | 1 |
ETR 60 | 600 | 0.675 | 2.40 | 1 |
ETR 67 | 675 | 0.853 | 3.00 | 1 |
ETR 75 | 750 | 1.053 | 3.70 | 1 |
ETR 82 | 825 | 1.274 | 4.50 | 1 |
ETR 90 | 900 | 1.518 | 5.50 | 1 |
ETR 105 | 1050 | 2.065 | 7.50 | 1 |
Ecosol (modular) Trash Rack Catchment Sizes and Cleaning Frequencies Cylindrical Pipes - 2018 |
Ecosol TRASH RACK CATCHMENT SIZES AND CLEANING FREQUENCIES (600mm wide) | ||||
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Product Code | Box Culvert Units (600mm wide) | Gross Pollutant Holding Capacities | Optimal Catchment Area (Ha) | Recommended Cleaning Frequency |
Box Culverts | mm | m3 | Ha | Per Annum |
ETR B37 6 | 375 | 0.421 | 0.15 | 1 |
ETR B45 6 | 450 | 0.505 | 1.80 | 1 |
ETR B52 6 | 525 | 0.589 | 2.10 | 1 |
ETR B60 6 | 600 | 0.675 | 2.40 | 1 |
ETR B75 6 | 750 | 0.843 | 3.00 | 1 |
ETR B82 6 | 825 | 0.927 | 3.30 | 1 |
ETR B90 6 | 900 | 1.012 | 3.60 | 1 |
ETR B120 6 | 1200 | 1.180 | 4.20 | 1 |
Ecosol (modular) Trash Rack Catchment Sizes and Cleaning Frequencies 600mm Box Culvert - 2018 |
Ecosol TRASH RACK CATCHMENT SIZES AND CLEANING FREQUENCIES (900mm wide) | ||||
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Product Code | Box Culvert Units (900mm wide) | Gross Pollutant Holding Capacities | Optimal Catchment Area (Ha) | Recommended Cleaning Frequency |
Box Culverts | mm | m3 | Ha | Per Annum |
ETR B37 9 | 375 | 0.632 | 2.30 | 1 |
ETR B45 9 | 450 | 0.750 | 2.70 | 1 |
ETR B52 9 | 525 | 0.884 | 3.00 | 1 |
ETR B60 9 | 600 | 1.012 | 3.60 | 1 |
ETR B75 9 | 750 | 1.264 | 4.50 | 1 |
ETR B82 9 | 825 | 1.390 | 4.90 | 1 |
ETR B90 9 | 900 | 1.518 | 5.70 | 1 |
Ecosol (modular) Trash Rack Catchment Sizes and Cleaning Frequencies 900mm Box Culvert - 2018 |
Cleaning frequencies are based on typical pollution loads of 0.280m3/ha/year for gross pollutants generated on typical fully developed urban catchment. Excludes coarse sedimentation typical urban pollutant loads.