Eco Sustainable Solutions Ltd

New Waste Technology – Street Sweeping Plant

Content of Presentation

• Summary of Eco operations & sites;• Issues associated with the end disposal of

street sweepings;• How the street sweeping plant works;• Management of the fractions.

Summary of Eco Operations

Summary of Eco Operations

• Main site based in Parley (Christchurch);• Parley Operations:- Composting of green waste (certified to PAS 100);- Storage & transfer of wood waste;- Storage, sorting & cleaning of soils/aggregates (soils

tested to BS 3882:2015);- Storage of food waste;- Storage & treatment (via composting – CLO) of street

sweepings & gulley waste.

Summary of Eco Operations

• Southampton Docks- Sorting, shredding & export of wood waste.

• Weymouth – Preston Beach Road- Storage & shredding of wood waste;- Storage of green waste & street sweepings.

• Piddlehinton (Dorchester)- Treatment of food waste via the AD plant (working

to PAS 110).

Issues Associated with the End Disposal of Street Sweepings

Issues around Disposal

• The previous treatment method – IV composting (spread as CLO to land under deployment);

• Analysis of leaf litter by EA in 2011 identified heavy metals (chromium, copper, nickel & zinc);

• Further analysis by the EA in 2012/13 had lower metals but high on polycyclic aromatic hydrocarbons;

• EA prohibited leaf litter from being mixed with compost and being spread on land;

• Impact on customer – increase gate fee as street sweepings being disposed via landfill.

Turning a Problem into a Solution

• Brainstorming exercise by Eco executive team to find a solution;

• How can the street sweeping waste be treated so the contaminants are removed?

• Investigated what technology could provide this solution;

• Researched technology manufactured by Siltbusters Group and CD Enviro;

• Selected CD Enviro to construct a purpose built street sweeping plant.

Construction & Permit of the Plant

• The construction of the plant took 4 months;• Construction finished in March 2014;• Variation to Parley Permit was granted in November

2014;• Investment of £1 million from Eco;• Has a capacity to treat 30,000 tpa;• Current load is 300 tonnes per week.

How it Works

In Summary

• Waste input – street sweepings, gulley waste and fresh water drilling mud;

• The plant cleans and separates the waste streams into the following fractions:

- Organic fraction: further treated through composting (spread as CLO);

- Solid ‘cake’ (dried sludge): further treated through composting (spread as CLO);

- Stones/grit: sold as a product.• Wash water is treated and recycled within the plant.

Tipping & Loading

• Customers tip street sweepings & gulley waste into separate concrete bays at Parley;

• Eco WLS move the waste from the bays into the hopper;

• Screw conveyor moves the material onto a conveyor belt.

Removal of Metal Items

• Material is moved up the conveyor belt;

• The material passes under a magnet;

• Metal objects are removed and emptied into a small skip.

Washing & Grading of Material

• Rotary screws wash and separate the material into the different fractions;

• Water & organic fractions flow down the chamber;

• Larger sized material is graded through screens.

Graded into the Fractions

Water Separated & Cleaned

• The wash water is pumped into the aqua cycle;

• The wash water is mixed with a polymer which binds the particulates and sludge;

• The particulates & sludge sink to the bottom.

Further Settlement of Water

• The wash water, via gravity, flows into two settlement tanks;

• Further sediment is allowed to sink to the bottom;

• Once the water has been through the settlement process it is reused for washing.

Treatment of the Sludge/Sediment

• The sludge from the aqua cycle and settlement tanks is pumped into a buffer tank;

• Using a centrifugal separation system, heavier solids are separated from the water;

• The water is pumped back into the settlement tanks;

• The dried ‘cake’ drops into the respective bay.

Management of the Fractions

Organic Fractions Composted

Management of the Fractions

• The organic fractions are removed from the bays and placed into windrows;

• The windrows will go through screening to remove the litter and monitored for temperature;

• This process is separated from our PAS 100 compost route;

• All separated fractions are undergoing testing to ascertain if there is any contamination;

• Quality Protocols are being written for the fractions in order to obtain ‘end of waste’.

End of Presentation

Any Questions?