ECOSOL (MODULAR) TRASH RACK

WATER SENSITIVE URBAN DESIGN & CONSTRUCTED WETLANDS

IN-LINE END-OF-LINE PRIMARY TREATMENT SOLUTION

Ecosol 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.

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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 Ecosol 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
Ecosol Trash Rack Key Dimensions & Flow Capacities - 2018
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
0.5%1%2%5%7%10%
Cylindrical Pipe Units
ETR 373750.26365124175248392463544
ETR 454500.379103201285403637754901
ETR 525250.5151513044306096111371359
ETR 606000.675211434614868137216231941
ETR 676750.8532825948401188187922222675
ETR 757501.053369787111315742488
ETR 828251.274468101414352029
ETR 909001.518582127918092559
ETR 10510502.06585513511910
Box Culvert Units (600mm wide)
ETR B37 63750.42122886122173274324387
ETR B45 64500.505299140109282445527630
ETR B52 65250.589377180202230389503612
ETR B60 66000.675461212301425672795951
ETR B75 67500.84364430342960796011361358
ETR B82 68250.927743415588831131515551859
ETR B90 69001.01282055077911021742
ETR B120 612001.18096070910051420
Box Culvert Units (900mm wide)
ETR B37 93750.63234286122173274324387
ETR B45 94500.750449140109282445527630
ETR B52 95250.884566180202230389503612
ETR B60 96001.012691212301425672795951
ETR B75 97501.26496630342960796011361358
ETR B82 98251.3901115415588831131515551859
ETR B90 99001.518118055077911021742

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
Ecosol Trash Rack Capture Efficiency Performance Summary - 2018
PollutantCapture EfficiencyDetails
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 SEDIMENT COLLECTION EFFICIENCY
Ecosol Trash (modular) Rack Sediment Collection Efficiency - 2018
Particulate Size (Micron)Capture Efficiency
2000 – 600020%
6000 – 1600048%
>16000 90%

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
Ecosol (modular) Trash Rack Catchment Sizes and Cleaning Frequencies Cylindrical Pipes - 2018
Product CodePipe and Culvert
Dimensions
Gross Pollutant
Holding Capacities
Optimal Catchment
Area (Ha)
Recommended Cleaning
Frequency
Cylindrical Pipesmmm3HaPer Annum
ETR 373750.2630.951
ETR 454500.3791.301
ETR 525250.5151.801
ETR 606000.6752.401
ETR 676750.8533.001
ETR 757501.0533.701
ETR 828251.2744.501
ETR 909001.5185.501
ETR 10510502.0657.501
Ecosol TRASH RACK CATCHMENT SIZES AND CLEANING FREQUENCIES (600mm wide)
Ecosol (modular) Trash Rack Catchment Sizes and Cleaning Frequencies 600mm Box Culvert - 2018
Product CodeBox Culvert Units
(600mm wide)
Gross Pollutant
Holding Capacities
Optimal Catchment
Area (Ha)
Recommended Cleaning
Frequency
Box Culvertsmmm3HaPer Annum
ETR B37 63750.4210.151
ETR B45 64500.5051.801
ETR B52 65250.5892.101
ETR B60 66000.6752.401
ETR B75 67500.8433.001
ETR B82 68250.9273.301
ETR B90 69001.0123.601
ETR B120 612001.1804.201
Ecosol TRASH RACK CATCHMENT SIZES AND CLEANING FREQUENCIES (900mm wide)
Ecosol (modular) Trash Rack Catchment Sizes and Cleaning Frequencies 900mm Box Culvert - 2018
Product CodeBox Culvert Units
(900mm wide)
Gross Pollutant
Holding Capacities
Optimal Catchment
Area (Ha)
Recommended Cleaning
Frequency
Box Culvertsmmm3HaPer Annum
ETR B37 93750.6322.301
ETR B45 94500.7502.701
ETR B52 95250.8843.001
ETR B60 96001.0123.601
ETR B75 97501.2644.501
ETR B82 98251.3904.901
ETR B90 99001.5185.701

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.

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