ECOSOL LITTER BASKET

LITTER BASKET – AT SOURCE KERB INLET PRIMARY TREATMENT SOLUTION

Litter Basket

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 Ecosol 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
Ecosol Litter Basket Key Dimensions - 2018
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
PitLitter-Basket(m3)200µm mesh1.5mm meshL/smm
Drainway600 x 595600 x 4450.12053106110150
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 Inlet600
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
1Holding capacities are largely determined by the existing inlet pit dimensions and the outlet pipe diameter but typically ranges from 120 - 364Kg at 100% full.
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
Ecosol Litter Basket Typical capture Efficiencies - 2018
Performance Criteria 1Capture Efficienacy
(200µm Filter Bag)
Capture Efficienacy
(1500µm Filter Bag)
Gross Pollutants (>600µm)100%97%
Total Suspended Solids (TSS) (20-600µm)41%15%
Total Phosphorous (TP)39%15%
Total Nitrogen (TN)11%4%
Heavy Metals6%2%
Total Petroleum/Hydrocarbon20%7%

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 Ecosol 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.

lvenessEcosol Litter Basket