ECOSOL STORM PIT CLASS 2

WATER SENSITIVE URBAN DESIGN & CONSTRUCTED WETLANDS

AT-SOURCE GRATED INLET OR IN-LINE SECONDARY TREATMENT SOLUTION

The Ecosol Storm Pit (Class 2) is a unique compact at-source or in-line secondary stormwater filtration system designed to carry out multiple treatment processes on stormwater runoff within the one compact underground device.  In particular it is designed to remove, at pre-determined treatable flows, particulate, dissolved and in some cases colloidally bound contaminants such as:

  • suspended solids
  • heavy metals
  • oil & grease
  • hydrocarbons
  • nitrogen and
  • phosphorous.

The system is ideally suited for smaller catchments such as commercial car park applications with inlet flows ranging from 10 – 110L/s. It provides a compact, cost efficient treatment solution specifically targeting suspended solids, heavy metals, total phosphorous and nitrogen including free floating oils and grease.  Housed in a pre-cast concrete pit, the unit consists of a primary treatment inlet litter basket designed to capture and retain all particles larger than 200 micron and then incorporates a series of internal baffles for retention of hydrocarbons in a spill situation and the retention of particles (> 93 micron). It also includes a unique patented multi barrier StormDMT filter media for secondary treatment.

STORM PIT CLASS 2 KEY FEATURES AND BENEFITS

Compact, cost efficient stormwater treatment solution for high density developments
Supplied as a complete system housed in its own pre-cast pit ready for installation
Easily maintained by vacuum truck
Durable robust product engineered for the environment in which it operates
Treats 100% if incoming flows up to its designed TFR.
Provides both primary and secondary treatment of stormwater within the one device.

Ecosol can provide MUSIC modelling, system design specific for your project.  We also manufacture in-house all components and commission and maintain your Ecosol Storm Pit, thereby providing you with a hassle free full turnkey service.

 

One of the great advantages of the Ecosol Storm Pit multi-barrier filter bed is its flexibility. A tailored filter bed arrangement with specific layer characteristics can be provided to accommodate site specific requirements. For example, if there is a need to target the removal of copper, zinc and/or lead then the Clinoptilolite layer can be designed thicker than the other two layers. Alternatively, if arsenic or phosphorous is a key focus then a thicker laterite layer can be incorporated. This tailored solution achieves higher performance and ensures a longer filter media bed operational life.

Key commercial technical features include:

  • widely available chemically conditioned filtration medias
  • a system capable of achieving low pollutant discharge levels
  • low visual impact and energy footprint
  • designed hydraulics with proven performance and longevity
  • scalable design and
  • cost effective maintenance regime.

Table 1 highlights the key dimensions for the range of Ecosol Storm Pits (Class 2).

Ecosol STORM PIT CLASS 2 TYPICAL SYSTEM CONFIGURATIONS
Ecosol Storm Pit Class 2 Typical System Configurations - 2018
Product CodeMaximum Outlet Pipe Diameter (Assumed 1% Gradient)Approximate External Dimensions (L x W x D below invert)Loading ClassificationPollutant Holding Capacities
Gross PollutantsSedimentHydrocarbons
(mm)(mm)(m3 (m3)(L)
Storm Pit (Class 2) 10L/s150mm3600 x 1650 x 1600D0.2881.1042,208
Storm Pit (Class 2) 20L/s225mm3600 x 1650 x 1600D0.2880.711,408
Storm Pit (Class 2) 40L/s225mm4500 x 1950 x 1600D0.360.8281,656
Storm Pit (Class 2) 60L/s300mm5600 x 2300 x 1600D0.4321.262,520
Storm Pit (Class 2) 80L/s300mm6500 x 2600 x 1600D0.5041.8063,612
Storm Pit (Class 2) 110L/s375mm7450 x 2950 x 1600D0.5762.2084,416

The below table provides general information on the typical Ecosol Storm Pit (Class 2) patented StormDMT multi barrier media bed, replacement material volumes and approximate bed dimensions.

Ecosol STORM PIT CLASS 2 PATENTED StormDMT MULTI BARRIER MEDIA VOLUMES
Ecosol Storm Pit Class 2 Patented StormDMT Multi Barrier Media Volumes - 2018
Product CodeMedia Bed Dimensions (Length x Width)PolypropyleneClinoptiloliteLaterite
VolumeBed DepthVolumeBed DepthVolumeBed Depth
(mm)(m3)(mm)(m3)(mm)(m3)(mm)
Storm Pit (Class 2) 10L/s840 x 12000.2022000.3023000.302300
Storm Pit (Class 2) 20L/s1670 x 12000.4012000.4012000.802400
Storm Pit (Class 2) 40L/s2670 x 15000.8012000.8012001.602400
Storm Pit (Class 2) 60L/s3350 x 18001.2062001.2062002.412400
Storm Pit (Class 2) 80L/s3850 x 21001.6172001.6172003.234400
Storm Pit (Class 2) 110L/s4600 x 24002.2082002.2082004.416400

Please Note: For optimal operation the system requires a minimum drop from the grated inlet or inlet pipe invert to the outlet pipe invert level of approximately 430mm.

The Ecosol Storm Pit (Class 2) is designed to treat stormwater runoff for typical urban catchments of 100 – 750m2 based on the product selection and on a 100% impervious catchment area. The system provides both primary and secondary treatment within the one compact underground device thereby reducing the space and cost of downstream tertiary treatment measures.

Ecosol STORM PIT CLASS 2 HYDRAULIC SPECIFICATION
Ecosol Storm Pit Class 2 Hydraulic Specifications
Product CodeMaximum Outlet Pipe DiameterMaximum Treatable Flow Rate (L/s)Maximum By-pass Capacity (L/s)
(Assumed 1% Gradient)(L/s)(L/s)
Storm Pit (Class 2) 10L/s150mm1115
Storm Pit (Class 2) 20L/s225mm2245
Storm Pit (Class 2) 40L/s225mm4445
Storm Pit (Class 2) 60L/s300mm6697
Storm Pit (Class 2) 80L/s300mm8897
Storm Pit (Class 2) 110L/s375mm121175

Typical quoted pollutant removal efficiencies based on results derived from the independently Field tested Ecosol Litter Basket and Ecosol Storm Pit (Class 2) published performance data.

ECOSOL STORM PIT CLASS 2 CAPTURE EFFICIENCY PERFORMANCE SUMMARY
Ecosol Storm Pit Class 2 Capture Efficiencies - 2018
PollutantCapture EfficiencyDetails
Gross Pollutants (GP)98%Particulate >200 micron
Total Suspended Solids (TSS)70%Suspended Particulate
Total Phosphorous (TP)52%Particulate and dissolved
Total Nitrogen (TN)52%Particulate and dissolved
Heavy Metals41%Particulate and dissolved
Total Petroleum Hydrocarbons (TPH)81%Particulate and dissolved

The Ecosol Storm Pit (Class 1) system is a compact at-source or in-line system that is designed specifically to provide primary treatment of stormwater flows in one compact device.

Typical applications include:

  • small commercial developments
  • urban roads kerbside inlets and
  • high density residential developments.

As with all filtration systems, the Ecosol Storm Pit (Class 2) should be cleaned regularly.  During the first two years of operation it is important to regularly monitor and maintain the system to better determine long-term maintenance regimes.  All elements within the Ecosol Storm Pit (Class 2) have been designed for easy safe and cost efficient cleaning by vacuum method.  Initially Ecosol recommends the primary treatment litter basket is cleaned 2 – 4 times annually and the sump at least once annually.

Ecosol STORM PIT CLASS 2 INDICATIVE CATCHMENT SIZES & CLEANING FREQUENCIES
Ecosol Storm Pit Class 2 Catchment Sizes and Cleaning Frequencies - 2018
Product CodePollutant Holding CapacitiesOptimal Maintenance FrequencyOptimal Catchment Area
Gross PollutantsSedimentHydrocarbonsPrimary Treatment ChamberSecondary Treatment Chamber
(m3)(m3)(L)Litter Basket CleanDetention Bay CleanStorm DMT Filter Media exchange(Ha)
Storm Pit (Class 2) 10L/s0.2881.1042,2082111.5
Storm Pit (Class 2) 20L/s0.2880.711,4082111.5
Storm Pit (Class 2) 40L/s0.3600.8281,6563111.8
Storm Pit (Class 2) 60L/s0.4321.2062,5203112.4
Storm Pit (Class 2) 80L/s0.5041.8063,6124113.0
Storm Pit (Class 2) 110L/s0.5762.2084,4164113.0

Cleaning frequencies are based on typical pollution loads of 0.280m3/ha/year for gross pollutants and 0.380m3/ha/year for sediment generated on a typical fully developed urban catchment. For larger catchments increase cleaning frequencies will be required.

lvenessEcosol Storm Pit Class 2