Public Works Department 1 Environmental Quality Commission June 11 2015 Background Citywide 40 diversion goal by 2020 Resource Evaluation Study 2014 Existing Mulching Operations Pilot Food Scraps Composting Program Implemented January 2015 ID: 676681
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Slide1
Current and Future Composting Operations
Public Works Department
1
Environmental Quality Commission
June 11, 2015Slide2
BackgroundCitywide 40% diversion goal by 2020Resource Evaluation Study – 2014Existing Mulching OperationsPilot Food Scraps Composting Program – Implemented January 2015
New Composting Facility – late summer 2016Partnership with Parks & ASU
2Slide3
Resource Evaluation Study3Slide4
Mulch vs CompostMulch/CompostMulch - yard clippings processed into chipped material
Compost – Mulch + quality food scraps, the biological decomposition of organic matter under controlled conditions
Food Scraps
Pilot Composting Program includes Partnerships with:
Bashas
’ (Food
City)
Aviation
Super Bowl - Special Events
Global
Green Innovators (
GGI)
P
roduce distributors
City Facilities
4Slide5
Super Bowl CentralCoordinated with The Super Bowl Host Committee and the NFL Containers placed at the Event
225 recycling125 compost150 trash containers with clear bags
5Slide6
Super Bowl Sorting73.1 Diversion66,740 pounds sortedTrash 26.9%Organics 31.8%
Aluminum 10.8%Recyclables 30.5%
6Slide7
Pilot Turf Study Compost Benefits on turf healthFunded by PWD with Parks
Beginning Fall 20152 year study 3-4 Park locations & DowntownUse Parks Dept. specifications
Cost Effective – Free during initial pilot phaseSupports the Circular Economy and Landfill diversion
Helps achieve City’s 40% diversion goal by 2020Research and expertise from ASU through PWD/ASU Partnership from the Resource Innovation and Solutions Network (RISN)
7Slide8
Composting Facility8Slide9
Aerated Static Piles Elevates oxygen levels
Oxygen depleted in less than 20 minutesTemperature controlReduces odor control
AIR is Most Influential Factor in compost stability*
9Slide10
Mass Bed Turning & Irrigation
Side
D
ischarge Turner
(turns 1,000 yd
3
/hr )
Irrigation Reel with hose connection to turnerSlide11
Forced Aeration OptionsPositiveNegativeReversing
11
Aerated Earth Pad with Reversing Aeration Slide12
Above or Below Grade Aeration?
Above Grade Piping with
Biofilter
Below Grade
Sparger
SystemSlide13
Blowers, Ducts & Dampers
Ducts sized to minimize friction losses
Negative aeration manifold
Rotary damper for reversing aeration
Dual damper system for open bunkers
Slide14
Advanced System Controls
Time/Temp Graph
Variable Frequency Drives
Aeration Control System & VFDs