Eggersmann play major role in providing high capacity MRF for Viridor Clyde Valley Residual Waste Project
The Clyde Valley Residual Waste Project involves a consortium of five local authorities - East Dunbartonshire Council, East Renfrewshire Council, North Ayrshire Council, North Lanarkshire Council and Renfrewshire Council - to deliver improved recycling and residual waste treatment to complement their existing recycling and composting activities.
Viridor, which was awarded the contract following a competitive dialogue process, will design, construct, finance and operate the facility to treat waste which would otherwise go to landfill. More than 90% of the partner councils' waste will be diverted from landfill and a Refuse Derived Fuel (RDF) will be produced which can be used to generate low carbon energy.
The new waste treatment facility is located at Bargeddie in North Lanarkshire on the eastern outskirts of Glasgow where Viridor will extract recyclable material, with the RDF taken to the company's £177 million energy recovery facility in Dunbar.
Planned to commence operations in December 2019, it is anticipated that Viridor will treat around 190,000 tonnes of waste per annum through the Bargeddie facility on behalf of the partner councils.
Head of Project Delivery, Phil Baker said: “After we were awarded the overall project we appointed Nationwide as Principal Contractor. The company provided the civils, buildings and all structural work. The plant supply and installation was awarded to Eggersmann Anlagenbau, and the principal consultants for the project are Wardell Armstrong. The total value of the project is approx. £25 million.
“Following commencement, the plant shall process for 12-hours a day, 7 days per week and will employ around 30 operatives. It will receive 90-100 truck movements each day and will deliver municipal solid waste (domestic ‘black bin’ waste) collected from the five local authorities, with the aim to produce an RDF material and also recover any metals and plastics that have slipped through the kerbside collection scheme. This will help the local authorities meet their obligation in terms of diversion to landfill.
“The contract has run very well, and we are currently in the process of cold commissioning. This is one of the very first plants where we designed the production plant first and then wrapped the building around it. Both Nationwide and Eggersmann have met this challenge and delivered.”
Eggersmann waste plant flow:
After a two-year plant design phase and consultation with Viridor the mechanical construction phase commenced in October 2018 and was completed in August 2019. Hot commissioning of the plant is now underway with takeover scheduled by the end of September.
Jonathan Fallon – Project Manager for Eggersmann, described the plant flow. “Essentially it is a twin-line system with waste material delivered to an in-feed hall where it is stored and then fed into the system, each line operating at approx. 36t/hr to produce the required 190,000 tonnes per annum throughput.
“Two static high-torque, slow-speed Shredders reduce the maximum waste size down to <300mm, the waste is then delivered via twin conveyors into two Trommel Screens which make three separations at 80/200/300mm. Any oversize (>300mm) is redirected back via conveyors to the in-feed hall for reprocessing. The remaining fractions then travel by conveyor passing through Overband Magnets and Eddy Current Separators to remove any ferrous and nonferrous metals. These metals are then conveyed to the picking cabin for quality control and into designated bays in the out-feed hall.
“The mid-fraction material, after passing through the metals recovery stage, is then conveyed to two Optical Sorters which positively eject all dense plastic material. The ejected plastics are then conveyed to the Ballistic Separator which separates the rounds from the flats. The recovery of the round dense plastic material is then conveyed to the picking cabin where non-target material is removed and the remaining dense plastic material is conveyed to a twin-ram baler where it is baled. All recovered metal and dense plastic material is then sent off site for specialised recycling.”
Jonathan continued, “Everything except the three products, ferrous, non-ferrous and plastic bottles, are collected on a separate conveyor and sent as RDF material to a shuttle conveyor which deposits the RDF into seven different storage bays below.
“This conveyor has an intelligent sensor system which can detect the height of material deposited in each bay to maximise the storage capability, before moving on to the next. All of the RDF material is then loaded by shovel into wagons that will take the RDF for thermal treatment at Dunbar Energy Recovery Facility.”
“There is high emphasis on plant throughput and efficiency, whilst also achieving pre-determined recovery and purity rates of the recyclable material”.
Air and odour extraction:
A key element for the whole system has been the inclusion of an air extraction system which has been installed by Schultz and Berger.
Extraction has been installed within each hall and around individual equipment, all of which link into one main extraction system. Each extraction system has its own dust filter and carbon filter to remove solid particles and any odours within the process air with each individual hall linking up to one clean air external stack, 35m in height.