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Tours of NYC Sites: St. John's University

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6th National Cultivating Community Composting Forum
Tour Day — St. John's University
Presenters: Tom Goldsmith, St. John’s University and Gregg Twehues, Compostwerks

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Tours of NYC Sites: St. John's University

  1. 1. May 12, 2019 6th National Cultivating Community Composting Forum Tours of New York City Community Compost Sites Presenters: Tom Goldsmith, St. John’s University and Gregg Twehues, Compostwerks
  2. 2. 2 Queens Campus •Second largest Catholic University •105 acres, 26 buildings •16,000 students, 2,300 resident students •Chartwells dining service company •5 part time student workers on composting •Food waste pulping facility •Academic Service Learning •Food Recovery Network participant •Community Garden & Compost site •St. John’s Bread & Life (soup kitchen)
  3. 3. 3 Student Garden Site 2009 2017 2011 2010 2017
  4. 4. 4 3-Bin System Construction Drain mixed with Garden french drain piping system (storm water) In-floor aeration system 3- bin system
  5. 5. 5 Composting Pre-consumer Food Waste 2012-15 3,000 pounds per week
  6. 6. 6 Pre & Post Food Waste 2016 - •Pre-consumer blue barrels (each 30 gallon) placed in kitchens •Post-consumer green bins (each 20 gallon) placed in dish washing room Typical day Somat Model SPC-50 located inside a modified shipping container Food waste input Pulped food output 8,000 pounds per week
  7. 7. 7 Annual Pre & Post Consumer Food Source Queens Campus 2.3 million S.F. Food waste collected 200 days per year (kitchen staff) 95% or more of food waste composted (student workers ) Food Waste Sources 3,500 meals served per day in one buffet style cafeteria Daily food prepared for three other cafeterias and events Spent coffee grinds from Dunkin and Starbucks Annual Food Waste Data WEIGHT VOLUME Pre consumer 88,000 pounds 44 tons 17,600 gallons 87 cubic yards Post consumer 108,000 pounds 54 tons 21,600 gallons 107 cubic yards Coffee grinds 8,000 pounds 4 tons 800 gallons 4 cubic yards Food Recovery 6,000 pounds 3 tons ___________________________ Total 210,000 pounds 105 tons 40,000 gallons 200 cubic yards
  8. 8. 8 Food Waste Is Pulped (dewatered) Annual Food Waste Data WEIGHT VOLUME Pre consumer 88,000 pounds 44 tons 17,600 gallons 87 cubic yards Post consumer 108,000 pounds 54 tons 21,600 gallons 107 cubic yards Total 196,000 pounds 98 tons 39,200 gallons 194 cubic yards Pulped 60 % WEIGHT 40% VOLUME Total 117,600 pounds 59 tons 15,680 gallons 78 cubic yards Reduce by 40% Reduce by 60%
  9. 9. 9 ASP Feedstock Mix Food waste, coffee and wood chips are mixed on the concrete pad with help of paid student workers SJU staff operates small pay loader to mix food waste, coffee and wood chips that are loaded into ASP 2012-15 - 3,000 pounds /week, mix every 2 weeks 2016 - pulped 8,000 pounds /week, mix every week
  10. 10. 10 ASP Weekly Feedstock Mix Pile capped off with 5 inches of finished compost •Thermal blanket •Odor control •Fly control •Retains moisture •Improves aesthetics Wood chips (4 cu yd) •Ratio - 3 wood to 1 pulped food •Mixture of fresh wood chips and recycled, screened off wood chips from compost pile Pulped food (18 barrels per mix) 5 inches of wood chips at base for good aeration After 3 weeks in ASP ready to unload Pulped food needs more wood chips (bulking material)
  11. 11. 11 Composting Process – Oxygen is Key OdorVapor Odor From O2 Compost
  12. 12. 12 Oxygen Depletion in Typical Compost Pile 0 5 10 15 20 25 Minutes OxygenLevel(%) Week 1 Week 2 10 20 30 40 Aerobic Anaerobic SJU’s Aeration sys. 1 minute on 19 minutes off From O2 Compost
  13. 13. 13 Aeration Allows the Operator to: Maintain Aerobic Conditions Mitigate Impacts from Objectionable Odors Manage Pile Temperatures Reduce the Loss of Nutrients Expedite the Rate of Composting & Curing Produce Superior Compost Products From O2 Compost
  14. 14. Temperature Change in a Typical Compost Pile TemperatureoF 40 60 80 100 120 140 160 A B C Time for SJU is 3 weeks active inside the ASP A = Mesophilic B = Thermophilic C = Curing55oC (131oF) 70oC (158oF) 40oC (104oF) Active Composting Phase Curing Phase 180 160 140 120 100 80 60 40 Time for SJU is 12 weeks curing in a pile outside the ASP Note:Plupedfoodbreaksdowninhalfthetime andpilegetshotter,quickerthannonpulped From O2 Compost
  15. 15. 15 Screening Compost & Finished Product Sittler trommel screen with ¼” screen (compost needs to be dry) Screening after 12 weeks in pile
  16. 16. 16 Full Service Organics Academic Service-Learning
  17. 17. 17 Compost & ASL Events
  18. 18. 18 Food Waste Reduction Campaign (ASL)
  19. 19. 19 Student Involvement (ASL)
  20. 20. 20 Compost Tea Compost tea is made when the biology and soluble nutrients attached to specially produced compost is extracted into oxygenated water and brewed for a 24 hours Microbial foods are generally added to aid in the growth and reproduction of beneficial microbes: Fish Hydrolysate, Humic Acid, Kelp Powder, Azomite, Unsulfured Molasses
  21. 21. 21 Initial Investment Sterling System $ 8,000 Plastic Lumber $15,000 Pay Loader (used) $15,000 Trommel $15,000 $53,000 PULPER $55,000 SUBTOTAL $108,000 MAJOR COMPONENTS LABOR & MATERIALS Site work $10,000 O2 construction $40,000 Roof, pipe & tarp $10,000 Trommel construction $20,000 Barrels, bins, hand truck $ 4,000 Spreader & Tea Brewer $ 4,000 Miscellaneous gear $ 2,000 $90,000 Pulper construction $45,000 TOTAL $243,000 SUBTOTAL $135,000 COMPOST Compost opportunity report $600
  22. 22. 22 Annual Operational Hours Daily Hours Weekly Hours Semi Annual Hours Food collection 2 Pulping (2 workers 2.5 hours) 5 Number of Days 200 Hours Per Year 1,400 Get wood chips 1.5 Screening compost 1.5 Empty compost bin 1.5 Mix (4 workers, 4 hours) 16 Number of Weeks 28 Hours Per Year 574 Screen compost 25 Spread compost 50 Compost Tea (outsource) Equip. maintenance (outsource) Times Per Year 2 Hours Per Year 140 TOTAL HOURS 2,114
  23. 23. 23 Sample Soil Test Report
  24. 24. 24 Sample Living Soil Report
  25. 25. 25 Thomas Goldsmith Director of Environmental & Energy Conservation St. John’s University 718.990.8008 office goldsmit@stjohns.edu It’s Worth The Effort Environmental & Social Benefits •Engage students (ASL) •Educational resource •Help alleviate hunger •Diversion from landfill •Improved soil quality •Increase storm water retention •Fight climate change •Reduce pollution •Less chemical dependency •Create meaningful jobs •University “brand value” Thank You Check out Youtube: “Full Service Organics” https://www.youtube.com/watch?v=7KhbozglGME Gregg Twehues and Peter Schmidt, Owners Compostwerks 487 MainStreet Mt. Kisco, NY 10549 (844) 266-9375 wholesale@compostwerks.com

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