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e 2/15/2011 Organics Diversion Program Organics Diversion Program Procurement History Brief Overview of Compost Operations Compared to reenaste processing, processing food & paper r d equires • 2005 - RFP 2036 awarded to Big Island EKO for additional �w esign & operational features to prevent odors an vermin like birds and rodents. A typical operation wou10 consist of 5 years - start w /mulching & progress to composting ReceivingQ area for collection trucks. Preparing /mixing feedstocks in an enclosedbuilding with bioltilters & other features to manage au flow and • 2008 RFP for compost operations issued and __ ' prevent odors canceled ` r ^ f ' 1 • M ° t M /J .• > v ,,,,,�., r / Area for mixing & moving feedstock daily (unlike greenwaste which can be • 2010 - No option years with EKO - contract stored for days at a time extended until 8/30/2011 - approximately $1.8 million annual Either electronic controls and /or more meticulous daily operations for cost monitoring. Marry systems conduct this in enclosed buildings or vessels. • 2010 - New RFP issued to continue mulch operations & canceled in April _rxo� wonu w•�a mom raooucn • Today - to c -o RFP being developed to n - •�^••++• progress to comppost st operations & divert more••` -mom+ organic materials Organics Diversion Program Organics Diversion Program Commonly Used Technologies Commonly Used Technologies • Aerated (turned) W indrow - Or anic waste is formed into rows of Iongg piles called "win rows" and aerat�d bV turning the pileperiodically by either '- .a manual or mechanical means The Ideal pile height, which is between 4 antl In Vessel - & feet, allows for a pile lar ge enough to generate sutflcient heat antl Most expensive to design, construct & maintain temperatures, yet small enoug to allow oxygen to Flow to the operate t windroWscore. Prmilesthe greatest degree of control. t • Process conducted inside Some type of^rrq • Covered Forced Air - Evgineered fabric butltlinas with aluminum frames, sealed container (the vessel) ,. air control, and blofilters to receiving & feedstocnc Dreparation. After Organic materials are fed into a drum, silo pp reparation, material is placed in windrows with fabric membrane covers codcrete -lined trench, or similar equipment - ` 1 �" - `'.e. Gore or Ag -bag) and aeration systems. where the environmental conditions— including temperature, moisture, and ,i aeration —are closely controlled' In- vessel composters vary in size and 6 » capacity. - pr Conversion of or anic material to compost can lake as little h as a few weeks. • Once the compost comes out of the vessel, however it requires more time for the microbial activity to stabilize and the pile to cool. Organics Diversion Program Typical Compost Equipment Organics Diversion Plan - Looking Ahead Tub Grinder - Maintain "free" residential drop -oft of greenwaste at select recycle r - and transfer stations 1 - • Continue backyard composting education and outreach program Seled vendor to establish East Hawaii and West Hawaii Compost 4 Trommel Screen Facilities at each landfill - Front -End Loader Consider implementation of ordinance to ban organics from landfills • County contractor to provide local compost for sale a - - Develop plan for composting of residential or anics (utilize Hilo Sort Station RF, encourage private sector to off�r curbside pickup and Compost Turner `t'•' expanding options at recycle & transfer stations) 7