Molson Green increase their machine portfolio.

Founded in 2016 by Johann Doppstadt, who is seen by many as one, if not the leading creative minds in the industry. His latest creation under the J. Doppstadt brand is the GT 130A De-Stoner which will be marketed in the UK by the Molson Group under their recycling focused Molson Green division.

Recently, Molson Green held a VIP demonstration event of the Doppstadt De-Stoner to introduce this versatile machine to the recycling market and the HUB-4 team were invited to see the De-Stoner within a processing line-up.

The two-day event was held at Laverstoke Park Farm (LPF) which is spread over 2,500 acres of rolling Hampshire countryside near Overton. Owned and run by ex-racing driver and Formula One World Champion Jody Scheckter, one element of the LPF business is green waste recycling which involves the supply of compost to biomass facilities.

Currently the business processes in excess of 30,000 t/year of green waste which originates from landscapers, hedge trimmers and municipal contracts.

Efficiency is always a key element in any processing function and the current operation at LPF required some improvement which led to a trial set-up to demonstrate how more efficiency and hence the increase in saleable material could be achieved.

Demonstration machine line-up:

With a trial in place it was also agreed that Molson Green could hold a VIP COVID compliant demonstration for a selected number of guests.

Four machines were supplied for the trial, a Terex Ecotec TSS 390 Single-Shaft Slow-Speed Shredder, a Terex Ecotec TSS 620T Trommel, a Doppstadt GT 130A De-Stoner and a Sennebogen 821E Material Handler. All these machines being available through Molson Green.

For the purpose of the trial the Terex Ecotec TSS 390 Shredder was fed green waste by the Sennebogen 821E Material Handler.

Processing in excess of 63tph green waste is shredded into a course material which in the full production process would then be put into windrows where it rots into compost.

After that process, the material is then put through an existing on-site trommel, taking out the fines then passing through an existing star screen which aggravates it further, taking out more fines and some lights.

This 8-60mm material (pre-processed) for the demonstration is then loaded by the 821E Material Handler into the Terex Ecotec TSS 620T Trommel which then screens out any -10mm saleable fines via a side conveyor. The oversize - clean organic and stone (up to 40% of the total mass) is then fed at a steady rate into the de-stoner immediately at the back end of the hopper

Thomas McKiver, Molson Green Head of Sales, takes up the story, “As the material is fed into the GT 130A, heavier items will drop down straight through to a bottom stone auger; past that there is a mesh which sits below the top auger. Basically, this means it stops all the light material being agitated through the water and pushed down amongst all the stone. This mesh also allows free water flow, which also cleans the stone as it flows through.

“The bottom auger is located in a long tube structure, which can be operated in either direction at variable speeds at a variable torque rate. In comparison the top auger is significantly bigger in terms of the width of the screw and has fewer spirals to efficiently lift up the light materials. There is a small gap in between the mesh and the top auger, which is designed to allow a little slippage, so you don’t have an issue with for instance a large stick, consequently alleviating the possibility of any jamming. Machine set-up is dependent on feedstock, which obviously dictates on how long you want it in the water to avoid over scrubbing.”

Looking at the operation it is obvious that water usage plays a very-large part of the process and the Doppstadt GT 130A De-Stoner is a leading exponent in its field proving that it is extremely efficient in this respect.

Being very efficient on water usage means significantly less water, subsequently eliminating any issues processing dirty water. With low consumption it is therefore from an environmental point of view a clear winner.

Thomas, added, “The wetter the material, the heavier compost (wood) becomes denser, increasing the probability of sinking, therefore the element of organic in the stone pile is significantly increased more than you ever achieve in the light pile; but the light pile in this application is the saleable product.”

Doppstadt GT 130A De-Stoner:
The Doppstadt De-Stoner is easy to transport and offers low operating cost per tonne of finished product. Featuring an 8 cu/m capacity it uses approximately 0.75 -1 cubic metre/hr of water which is primarily due to absorption in the material.

Essentially fed by a screening machine the De-Stoner’s task is to separate material mixtures from floating and non-floating materials (wood, stones, glass) which it achieves by a separation process with water (floating/sinking technique); separated material is then stockpiled through side (heavies: gravel/stones) and end (lights: wood) on-board conveyors. Separated material also does not require long drying periods therefore allowing a quicker turnaround.
Offering a 15-20tph throughput it can be supplied with one of three drive types, diesel, hydraulic or electric.

This launch of the Doppstadt GT 130A De-Stoner certainly compliments the Molson line-up of equipment, again reinforcing their stance of being a sole source of supply which allows clients to maximise on their buying power and simplify their supply chain. With 75 engineers on the road and 13 service locations Molson offer a high level of service back-up that is virtually incomparable in the UK.

Associated Businesses

  • Molson Group are the UK’s largest independent new and used equipment dealer. With a customer focused approach, we are able to provide clients of all sizes a single source supply option of market leading products, backed up by a tea...