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

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?