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Mechanical Biological Treatment (MBT) Facility
The MBT plant will take all of Cambridgeshire's residual (‘black bag’) waste, that is currently not recycled or composted and has been going to landfill. Using some of the latest machinery and technology, it will separate out elements of this rubbish for recycling and composting.
Firstly the waste is loaded into bag splitters, which empty the waste out of bags and sends it to giant circular sieves (trommel screens), which divide the waste by size for ease of separation. Hard particle separators use tilted vibrating plates to extract glass and stones for recycling. Large electro-magnets pull out any ferrous items such as steel cans and eddy current separators sort out non-ferrous metals for recycling. Ballistic separators sort the waste into heavy and light fractions, and plastics are then extracted from the latter fraction using near infra-red separators, which use the different wavelength absorption of plastics and targeted air jets to blow them onto different conveyor belts.
It is expected that this mechanical sorting of the waste will separate between 20 – 25% of the waste for recycling. The remainder, mainly paper, cardboard, food and garden waste, will then be taken by conveyor belts to three large machines that grind the waste and add measured amounts of water ready for the material to be taken to the largest part of the MBT plant, the composting hall, which is roughly 70 metres wide and 200 metres long. Conveyors will lay the organic waste across the hall, to a depth of around three metres, and giant mechanical turning wheels will keep the material aerated by turning it 24 hrs a day, seven days a week, and moving down the hall. After seven weeks the organic material will have been moved 200 metres along the hall, and will then be extracted by conveyor, screened and stored for use. Due to the fact that the input is mixed waste, the material produced cannot be used by farmers or the public, but AmeyCespa (East) hopes to use the compost-like output of the MBT plant for quarry restoration, growing energy crops or as a fuel. |
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