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Eco Sustainable Solutions Ltd

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.

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Eco Sustainable Solutions Ltd

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  1. Eco Sustainable Solutions Ltd New Waste Technology – Street Sweeping Plant

  2. 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.

  3. Summary of Eco Operations

  4. 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.

  5. 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).

  6. Issues Associated with the End Disposal of Street Sweepings

  7. 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.

  8. 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.

  9. 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.

  10. How it Works

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. Graded into the Fractions

  16. 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.

  17. 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.

  18. 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.

  19. Management of the Fractions

  20. Organic Fractions Composted

  21. 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’.

  22. End of Presentation Any Questions?

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