Rocky Hill Farm Digester Project - Buzun
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Rocky Hill Farm Digester Project - Buzun






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  • The tube has been delivered and is being lifted off the trailer.
  • After many hours of welding we have lengthened the tube, added a door and moved the end rings in place.
  • This is the final site where the digester will be installed on two metal stands that we fabricated which rests on two concrete pads.
  • Things are moving right along and the crane once again has arrived to lift the digester onto the metal stands.
  • We have had a very busy fall fabricating all the gears and conveyor stands, but alas winter has arrived and now we are fighting the weather.
  • This is a close up view of the gears and chains that turn the digester.
  • The gear box turns the massive gears and chains.
  • We’re very scientific at Rocky Hill. Notice the chalk lines that we used to time to see how long it takes for the digester to make one revolution.
  • The end is near. The electricity has been hooked up and the switch has been turned on. It Works!
  • The insulation has been installed to retain the heat for the digester to work its magic. Compost is coming out steaming after 3 days of slow turning.
  • The digester has been a challenging project but extremely rewarding to see the end product.
  • This is what the raw material looks like as it goes into the digester. It is a mixture of food waste, cardboard, wood chips, leaves and grass.
  • After 3 days of rotating in the digester the raw mixture is emptied out and is unrecognizable. The volume has been reduced by about 65%.
  • There are 3 temperature gauges in various locations to monitor how much heat the material is generating as it turns in the digester. Ideally you want to be between 140F-160F.
  • Mike, our foreman loads the digester every morning with fresh material to constantly feed the tube.

Rocky Hill Farm Digester Project - Buzun Rocky Hill Farm Digester Project - Buzun Presentation Transcript

  • Rocky Hill Farm Digester Project By Marianne, Fran, and Joe Buzun
  • Constructing the Tube
    • Two sections
      • 36 foot section
      • 17 foot section
    • Two sections welded together for total length of 53 feet.
    • Diameter is 10 feet
    • Total volume approximately 150 yd³.
    • Runs at 60-70% capacity.
  • Delivery of 36 foot section
  • Welding the two sections
  • Completed 53 foot tube
  • Building the Stanchions
    • Poured two square concrete pads.
    • Made two stanchions out of I-beams and mounted rollers to top to allow tube to rotate on.
    • Stanchions made to different heights to create ideal pitch of tube.
  • Pouring the Concrete Pads
  • Placement of stands on concrete pads
  • Tube is placed onto stanchions
  • Gearing
    • Driven by three horsepower electric motor into a gear reducing transmission.
    • Transmission is chain driven which drives main chain around tube.
    • Turns one revolution every 15 minutes.
  • Main Sprocket
  • Gear Reducer
  • Gear Reducing Transmission
  • Finished Machine
    • Coated with four inches of insulation.
    • Temperature reaches between 140-160°F.
    • Handles 30 yd³ daily.
    • Material takes three days for completion.
  • Finished before insulation
  • Finished after insulation
  • Material to be composted
  • Product before screening
  • Material being loaded
  • Disney Composting Site