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

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