Eco Sustainable Solutions Ltd New Waste Technology Street

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?