ECOSOL LITTER BASKET
LITTER BASKET – AT SOURCE KERB INLET PRIMARY TREATMENT SOLUTION
The Ecosol Litter Basket captures and retains a range of gross pollutants at entry points to the drainage network. Easily installed into most types of side entry pits, also known as gully pits or catch-pits, it retains more than 97% of pollutants greater than 2000μm and in the field it has been found to collect much smaller particles, including fine sediments.
For many years the Ecosol Litter Basket has been seen as the industry standard for at-source filtration with its effectiveness proven over time both in the field and under strict laboratory conditions. Consisting of a capture basket, reusable liner, and overflow bypass flap(s) the Ecosol Litter Basket is fitted below the invert of the gutter inside the drainage pit and, importantly, does not obstruct flow into the outlet pipe. The liner is easily removed and emptied during maintenance and comes in a range of filtration fabric sizes from 100μm to 3000μm, depending on the site requirements.
The Ecosol Litter Basket is designed to meet strict engineering guidelines and manufacturers guarantees and is one of the most durable at-source treatment systems available. The stainless steel components have a life expectancy of 15 years while the filtration bag has a life expectancy of 5 years, providing appropriate maintenance practices are employed.
KEY FEATURES AND BENEFITS
- Cost efficient and effective at-source primary treatment solution
- Easily retrofitted into existing stormwater inlet pits
- Easily maintained by manual basket removal or by vacuum truck
- Captures 97% of pollutants larger than 600 micron
- Durable robust product engineered for the environment in which it operates
At Urban Asset Solutions we can site measure, fabricate, install and maintain your Litter Basket making the whole process seamless.
The Ecosol Litter Basket can be fitted to new and existing side entry pits (whether single, double, or triple in size), including those with non-standard inlets, outlets, and junctions. It can be customised to fit almost any stormwater inlet pit.
Typical configurations include:
The Ecosol Litter Basket treats 100% of all flows entering the drainage inlet pit. When the filtration basket becomes full with retained pollutants the system then operates in by-pass until either the rain event ceases or the unit is cleaned.
| Ecosol LITTER BASKET KEY DIMENSIONS | |||||||
|---|---|---|---|---|---|---|---|
| Stormwater Inlet Pit Description | Dimensions (Length x Width)3 | Holding Capacity (typical basket depth 450mm)1 | Treatable Flow Rate (L/s)2 | By-pass Capacity | Static Head in By-Pass |
||
| Pit | Litter-Basket | (m3) | 200µm mesh | 1.5mm mesh | L/s | mm | |
| Drainway | 600 x 595 | 600 x 445 | 0.120 | 53 | 106 | 110 | 150 |
| Single Grated Kerb Inlet (with Lintel) | 600 x 600 900 x 750 900 x 900 | 600 x 450 900 x 450 900 x 600 | 0.121 0.182 0.243 | 53 83 83 | 106 167 167 | 110 215 215 | 150 150 150 |
| Double grated Kerb Inlet (with Lintel) | 1200 x 600 1200 x 900 1800 x 600 1800 x 900 | 2 x 600 x 450 2 x 600 x 600 2 x 900 x 450 2 x 900 x 600 | 0.243 0.324 0.364 0.496 | 103 103 106 106 | 212 212 220 220 | 220 430 230 440 | 150 150 150 150 |
| Single Side Kerb Inlet (with Lintel - no grate) | 600 x 660 900 x 750 900 x 900 | 600 x 450 900 x 450 900 x 600 | 0.121 0.182 0.243 | 53 83 83 | 106 167 167 | 110 215 215 | 150 150 150 |
| Double grated Kerb Inlet (with Lintel - no grate) | 1200 x 600 1200 x 900 1800 x 600 1800 x 900 | 2 x 600 x 450 2 x 600 x 600 2 x 900 x 450 2 x 900 x 600 | 0.243 0.324 0.364 0.486 | 103 106 106 106 | 212 220 220 220 | 220 430 230 440 | 150 150 150 150 |
| Grated Field Inlet (no Kerb or Lintel) | 600 x 600 900 x 750 900 x 900 | 600 x 450 900 x 450 900 x 600 | 0.121 0.182 0.243 | 53 83 83 | 106 167 167 | 110 215 215 | 150 150 150 |
| Circular Inlet | 600 750 900 1050 | 437 x 437 558 x 558 680 x 680 801 x 801 | 0.085 0.140 0.208 0.228 | 54 92 103 103 | 108 184 212 212 | 120 172 225 225 | 150 150 150 150 |
| Ecosol Litter Basket Key Dimensions - 2018 | |||||||
2The TFR varies dependent on the size and gradient of the outlet pipe and the percentage of fill for the individual baskets. For the purpose of providing indicative TFRs we have assumed a minimum 375mm diameter outlet and empty litter baskets.
3All Ecosol Litter Baskets installed in pits larger than 600mm in width are fitted with two by-pass mechanisms. Pits equal to our less than 600mm in width including all circular pit configurations are fitted with a single by-pass mechanism only.
OPTIONS
To enhance the product capture efficiencies other filter medias can be incorporated into the design such as:
- Hydrocarbon booms installed within the Ecosol Litter Basket thereby providing additional protection against oil or fuel spills in wet conditions.
- Reactive filtration media pillows installed at the base of the basket to provide improved capture efficiencies for heavy metals, total nitrogen, total phosphorous, turbidity and suspended solids.
| Ecosol LITTER BASKET TYPICAL CAPTURE EFFICIENCIES | ||
|---|---|---|
| Performance Criteria 1 | Capture Efficienacy (200µm Filter Bag) | Capture Efficienacy (1500µm Filter Bag) |
| Gross Pollutants (>600µm) | 100% | 97% |
| Total Suspended Solids (TSS) (20-600µm) | 62% | 15% |
| Total Phosphorous (TP) | 40% | 15% |
| Total Nitrogen (TN) | 16% | 4% |
| Heavy Metals | 18% | 2% |
| Total Petroleum/Hydrocarbon | 36% | 7% |
| Ecosol Litter Basket Typical capture Efficiencies - 2018 | ||
In order to determine a meaningful characterisation of the Ecosol Litter Baskets collection efficiency, an extensive verification phase was undertaken by Avocet Consulting Pty Ltd, Ecosol Pty Ltd and EngTest (The University of Adelaide).
1Figures 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 Ecosol Litter Baskets provide physical screening and the removal of chemical constituents is therefore largely dependent on the chemical composition of the particles and the bonding of these chemical constituents to the surface of the particles.
Initially Urban Asset Solutions recommends that monthly monitoring is undertaken. Once the unit has been in operation for an extended period of time (say, 12 months) the monitoring schedule can be adjusted to reflect the actual operating conditions specific to the catchment. It is also recommended that the unit is inspected after every major storm event. One of the key advantages of the Ecosol Litter Basket is that it can be cleaned by either vacuum method using street-sweeping vehicles or manually by removing the basket.
Maintenance is recommended 3 – 4 times annually based on typical urban pollutant loads for fully developed small impervious catchments up to 500m2. For larger catchments increased maintenance frequencies will be required.
