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Screening bucket is a greener start to the AD process

Local Generation, which operates an anaerobic digestion (AD) plant in March, Cambridgeshire, has taken a different approach to handling its food waste feedstock.

Most AD plants shred their mixed feedstock and use a static shredder to remove packaging. This involves tipping the food into a large pit with an auger in the bottom, which turns and pulls the material, then uses a bucket to transfer material from the pit into a hopper which starts the AD process.

But Local Generation uses a pair of Remu screening buckets for the de-packaging process. This allows it to blend the materials, which are then shredded through the bucket straight into the hopper.

Its larger bucket is a Remu WL160 with a plastic bag cleaner system, which is used on a JCB 426 loading shovel, while the smaller bucket is a Remu EP3150 on a JCB TLT35D teletruck.

Local Generation contacted Worsley Plant to develop a solution. It found the benefits of using screening buckets include: the bucket is mobile and can be used to load the hopper directly; the bucket and hopper work as one; often the auger can get stuck and jammed with plastic; the bucket produces a consistent end product and cuts down on blockages and disruption to the plant; having two buckets means there is never any down time on the plant; it is easier to change and cheaper and easier to run.

Andrew Purse, Worsley business development manager, said: “Using a screening bucket is a more forward-thinking and greener solution to the start of the AD process, allowing materials to be moved around and processed more easily.

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