eco sustainable solutions ltd new waste technology – street sweeping plant
TRANSCRIPT
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?