Ecosol Bio Filter

The Ecosol Bio Filter (at-source/in-line tertiary solution) provides not only conventional tertiary bio-filtration treatment of fine suspended solids and dissolved pollutants in stormwater flows but also primary treatment for capturing larger gross pollutants that may impede the unit ’s performance.

Ecosol Bio Filter Ecosol Bio Filter 51

Biofilters are an integral part of a total treatment train approach and are able to be applied at street scale to capture and treat stormwater runoff close to its source.

Biofilters also commonly referred to as rain gardens are configured as vegetated filtration systems with a collection pit and are designed to remove fine suspended solids and dissolved pollutants. The system operates by filtering stormwater runoff through densely planted vegetation and then percolating the runoff through a prescribed filter media. Extended detention within the unit acts to slow incoming stormwater, allowing suspended particles to settle. The stormwater then seeps through the underlying sand, soil or gravel filter media, where physical, chemical and biological processes contribute to pollutant removal.

Ecosol-Bio-Filter-01  Ecosol Bio Filter Ecosol Bio Filter 01

The EcosolTM Bio Filter is a fully self-contained modular system supplied to site ready to install thereby reducing onsite construction lead-times and disruption to the general public. The product is unique in that it provides not only conventional tertiary biofiltration treatment of fine suspended solids and dissolved pollutants conveyed in stormwater flows but it also incorporates a primary treatment chamber to capture and retain the larger gross litter loadings that often impede the performance of the Biofilter. Effectively the EcosolTM Bio Filter is a fully self-contained treatment train system.

Operation

Ecosol Bio Filter  Ecosol Bio Filter Ecosol Bio FilterThe EcosolTM Bio Filter operates similarly to a sand filter. It is configured as a vegetated filtration system within a collection pit and is designed to remove fine suspended solids and dissolved pollutants. The vegetation planted within the unit acts to slow incoming stormwater, allowing suspended particles to settle.

The stormwater then seeps through the underlying sand, soil, or gravel filter media, where physical, chemical, and biological processes contribute to pollutant removal. Installed at street level to capture and treat stormwater runoff close to its source, the unit is effectively a fully self-contained treatment train system.

 

 

Applications

The EcosolTM Bio Filter is available in two different configurations (at-source roadside kerb inlets or in-line for small pipe diameters up to 225mm). It is ideally suited for use in new urban greenfield developments but can also be easily retrofitted into existing kerbside urban drainage networks. It can be located in car parks, shopping, centres, and residential housing developments. The unit is typically installed within the parking lane or verge of the road.

 

Under Construction

 

 

Key Dimensions

The EcosolTM Bio Filter is a multi-chamber engineered pre-cast concrete system consisting of an inlet chamber with a removable primary filtration basket into which stormwater enters from a typical kerb inlet. Gross Pollutants are captured and retained in this basket helping protect the engineered infiltration media and vegetation from premature blocking.

The unique design of the inlet chamber also enables free-floating oils and hydrocarbons, such as cooking and motor oils that do not emulsify in aqueous solution, to be captured and retained, again helping protect the infiltration media and plant life.

The stormwater then continues into the tertiary treatment chamber at designed inlet flow velocities where extended detention allows stormwater to pond to a depth up to 300mm above the filter. This stormwater then slowly filters through the vegetated filter media where physical and biological processes remove pollutants. Treated water then flows through the transition and drainage layer into the underdrain pipes and then back to the drainage system. The system is also designed with an overflow by-pass weir.

The table below highlights the key dimensions for the range of EcosolTM Bio Filter.

Ecosol-Biofilter-2

 
 

The EcosolTM Biof Filter is available in either dry or wet sump configurations. The tables below confirm the media type, depths and volume as supplied with each system. Designed infiltration rates may vary with different media suppliers.

Option 1 - Wet Sump EcosolTM Bio Filter (Total Filter Depth 1250mm from outlet baffle invert allowing for 450mm deep detention zone) Minimum drop through system is 800mm.

BioFilter-WetSump-171213Ecosol-Bio-Filter-03Ecosol-Bio-Filter-04Ecosol-Bio-Filter-05

 
 

Detention Zone
The EcosolTM Bio Filter is designed to have a maximum detention zone of 300mm depth.

Infiltration Zone
This is the top layer for filter media (in the unsaturated zone). This should be well graded material consisting of a Bio Retention Filter Media. It should have particle size ranges present from 0.075 to the 4.75mm sieve (as defined by AS 1289.3.6.1 – 1995) and should be certified to the FAWB and Healthy Waterways guidelines. The recommended depth of the infiltration zone for the EcosolTM Bio Filter is 400mm.

Transition Layer
The transition layer shall consist of clean well graded sand material containing <2% fines. The transition layer depth is typically 100mm consisting of a Bio coarse sand.

Submerged Filter Media Zone (optional to wet sump systems only)
The filter media (in the submerged zone) should be well graded consisting of sand and carbon source. It should have particle size ranges present from 0.075 to the 4.75mm sieve (as defined by AS 1289.3.6.1 – 1995) and should be at a typical depth of 300mm above the underdrain collection pipes.

Drainage layer
The drainage layer consists of clean washed, fine gravel such as 2 – 5mm washed screenings and is designed to avoid migration of the filter media layer material into the drainage layer. The drainage layer collects the treated stormwater and conveys it to the submerged filter zone it should have an approximated depth of 150mm.

Underdrain Collection Pipes
The Under Drain Collection Pipes consists of 100mm diameter class 400 slotted or perforated collection pipes. This has been specifically designed and modelled to ensure that water is able to freely drain away from the filtration media thereby not adversely affecting its performance. In addition they are protected with a drain coil filter sock. Please refer to the above table for unit specific figures.

 

Option 2 - Dry Sump EcosolTM Bio Filter (Total Filter Depth 950mm from outlet baffle invert to outlet pipe invert) Minimum drop through system is 950mm.

BioFilter-DrySump-181213Ecosol-Bio-Filter-06Ecosol-Bio-Filter-07

 
 

Detention Zone
The EcosolTM Bio Filter is designed to have a maximum detention zone of 300mm depth .

Infiltration Zone
This is the top layer for filter media (in the unsaturated zone). This should be well graded material consisting of a Bio Retention Filter Media. It should have particle size ranges present from 0.075 to the 4.75mm sieve (as defined by AS 1289.3.6.1 – 1995) and should be certified to the FAWB and Healthy Waterways guidelines. The recommended depth of the infiltration zone for the EcosolTM Bio Filter is 400mm.

Transition Layer
The transition layer shall consist of clean well graded sand material containing <2% fines. The transition layer depth is typically 100mm consisting of a Bio coarse sand.

Drainage Layer
The drainage layer consists of clean washed, fine gravel such as 2 – 5mm washed screenings and is designed to avoid migration of the filter media layer material into the drainage layer. The drainage layer collects the treated stormwater and conveys it to the underdrain pipes and has a typical depth of 150mm (above the underdrain collection pipes) for a dry sump system. Please refer to the above table for unit specific figures.

Underdrain Collection Pipes
The Under Drain Collection Pipes consists of 100mm diameter class 400 slotted or perforated collection pipes. This has been specifically designed and modelled to ensure that water is able to freely drain away from the filtration media thereby not adversely affecting its performance. In addition they are protected with a drain coil filter sock. Please refer to the above table for unit specific figures.

General Notes:

  • Engineered media is supplied separately and installation is the responsibility of the purchaser.
  • Installation and operation of the EcosolTM Bio Filter is recommended once site conditions have stabilised.
  • The under drain collection pipes, geo-fabric, inlet primary filtration basket and Ductile Iron access covers are supplied factory fitted with the EcosolTM Bio Filter.
  • For optimal performance a temporary ponding depth of 200 – 300mm above the infiltration layer is recommended.
  • Careful selection of the most appropriate vegetation is necessary to ensure optimal performance of your Biofilter. Consult with your local council to determined preferred species.
 
 

Removal Efficiencies

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. The EcosolTM Bio Filter is designed to carry out multiple treatment processes of stormwater within the one compact modular system. Its design complies with Water Sensitive Urban Design, and best stormwater management practice which typically predicts that an appropriately sized system will achieve the following removal efficiencies:

Ecosol-Bio-Filter-08

Quoted removal efficiencies are based on 100% of the surface run-off from the catchment being treated by the EcosolTM Bio Filter up to its maximum designed infiltration flow rate without by-pass and with an extended detention depth of 300mm. The system provides a high level of treatment in a relatively small surface footprint. It can also be configured to include a saturated zone for improved nutrient removal and plant survival during dry periods.

 
 

Primary Treatment – Pollutant Holding Capacities

The EcosolTM Bio Filter is a multi-chamber engineered pre-cast concrete system consisting of an inlet chamber with a removable primary filtration basket into which stormwater enters from a typical kerb inlet. Gross Pollutants are captured and retained in this basket helping protect the engineered infiltration media and vegetation from premature blocking.

The unique design of the inlet chamber also enables free-floating oils and hydrocarbons, such as cooking and motor oils that do not emulsify in aqueous solution, to be captured and retained. This main benefit of this primary treatment inlet chamber is that it provides protection for the tertiary treatment chamber and extends its operational life.

Ecosol-Bio-Filter-09

Quoted Capture Efficiency (CE) values are intended as a general guide only, and are subject to site specific stormwater quality modelling (MUSIC), giving consideration to catchment size, rain events, pollutant concentrations and media configurations.

Reference – Facility for Advancing Water Biofiltration (FAWB), Advancing the design of stormwater biofiltration, June 2008.

 

 

 

Hydraulic Specification

Treatable Flow Rate

Treatable Flow Rate (TFR) is defined as the maximum flow rate (also known as the infiltration flow rate) through the EcosolTM Bio Filter before the flow overtops the designed by-pass overflow weir within the system. TFR is constrained by the infiltration capacity (Hydraulic Conductivity) of the engineered filter media and vegetation. Extensive testing was undertaken at actual designed media depths to avoid any possible error in interpolating TFR data.

Ecosol-Bio-Filter-10

 
 

The overflow chamber within the EcosolTM Bio Filter consists of an EcosolTM Drop Trap to ensure at an absolute minimum primary treatment of by-passing flows and also to provide temporary storage of treated stormwater flows. When the water levels and flows in the biofilter exceed the extended detention depth in the tertiary treatment chamber, stormwater is then conveyed to the overflow chamber and then into the downstream drainage system. However unlike other designs the EcosolTM Bio Filter unit will always capture and retain gross pollutants within its primary treatment chambers. The overflow (by-pass) chamber has been designed to discharge peak flows.

 
 

Maintenance

Cleaning and Maintenance

When designing the EcosolTM Bio Filter careful consideration was given to ensure it was able to be maintained easily. Multiple access points over each chamber have been incorporated into the design providing safe access.

As with all filtration systems the EcosolTM Bio Filter should be regularly maintained. The maintenance frequency and cost depends heavily on the catchment type and rainfall.

One of the key advantages of the EcosolTM Bio Filter is that the primary filtration basket can be manually cleaned. As this is most likely to need regular maintenance, having the ability to clean it manually significantly reduces ongoing third party maintenance costs. The wet sump chamber containing captured coarse sediment and hydrocarbons will need to be cleaned at recommended intervals with a small vacuum truck removing all retained contaminants with each clean.

Regular inspection and maintenance is necessary to maintain the performance of your EcosolTM Bio Filter. The below table provides a guide of key activities for maintenance of your system.

Ecosol-Bio-Filter-11

 
 

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 EcosolTM’s 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 detailed report provided on completion of each clean
  • trained and experienced staff and
  • remedial work completed, if required.
 
 

Applications

The versatile EcosolTM Bio Filter design is ideally suited for use in new urban green-field developments or can be easily retrofitted into existing kerbside urban drainage networks.

As a modular precast concrete unit, it is supplied to site with all internal components pre-factory fitted ensuring simple on site installation of the unit. In addition EcosolTM can also supply seperately the internal filter medias along with plants if requested by the client.

It has a range of applications including:

  • Industrial and commercial sites such as car parks and shopping centres
  • High density residential housing developments.

The EcosolTM Bio Filter can be installed typically within the parking lane or verge of the road. Depending on the number of units installed the sysem can treat runoff from single lots up to entire streets.

 

Bio-Filter-Urban-application

Typical High density residential application

Ecosol-Bio-Filter-kerb-side-installation

Typical kerb-side installation

Ecosol Bio Filter Installation Guides


EcosolTM Bio Filter 600 - Dry - Installation Guide


EcosolTM Bio Filter 600 - Wet - Installation Guide


EcosolTM Bio Filter 750 - Dry - Installation Guide


EcosolTM Bio Filter 750 - Wet -  Installation Guide


EcosolTM Bio Filter 900 - Dry - Installation Guide


EcosolTM Bio Filter 900 - Wet - Installation Guide


EcosolTM Bio Filter 1050 - Dry - Installation Guide


EcosolTM Bio Filter 1050 - Wet - Installation Guide


Ecosol Bio Filter Maintenance Guide
 

EcosolTM Bio Filter - Maintenance guide


Ecosol Bio Filter Interactive PDFs
 

EcosolTM BioFilter In-Line - 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 (4.6mb)

This interactive PDF can only be viewed on the latest versions of Safari or Internet Explorer and will require the latest version of Adobe Reader.

EcosolTM Bio Filter at Source 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 (3.7mb)

This interactive PDF can only be viewed on the latest versions of Safari or Internet Explorer and will require the latest version of Adobe Reader.


Related Products