1. WDR Steering Committee
Food Waste Co-Digestion
Orange County Sanitation District
WDR Steering Committee
November 2, 2017

2. Organic Waste – Greenhouse Gas
6 Million tons/year of Food Waste generated each year
1 – 2 Million tons/year in OC
Landfilled Organic Materials (Tons Per Year)
Air District Boundary
0 – 50,000
50,001 – 150,000
150,001 – 1,000,000
1,000,000 – 2,000,000
>2,000,000
Food Waste
GHG Issue
Source: CalRecycle

3. Organics Market CARB CalRecycle CARB/CEC AB 32 (2006)
Renewable Energy
Organics Diversion and GHG Reduction from Landfill
Sept 14
CalRecycle
AB 1826 (2014) - Mandatory Organics Recycling
AB 341 (2011) –75% of Solids Waste by 2020
CARB
CARB/CEC
SB 1383 (2016) - 50% organics diversion from landfill by 2020 and 75 % by 2025 – Includes Biosolids
AB 32 (2006)
SB 32 (2016) – 40% Reduction GHG below 1990 levels by 2030
Goal 33% Renewable Energy
“Organics Market”

4. AB1826 (2016) – Mandatory Organics Recycling Program
2016-Apr Jan Jan Jan
Total SSO Quantity
8 CY/wk Organics
4 CY/wk
Organics
2 CY/wk
MSW
Business
Apartment Complex 5 Units or greater

5. Solids Resource Recovery
Resources
Biogas
Raw Sewage
Raw Sludge
Digester
Biosolids

6. Co-Digestion of Food Waste
Organics/Food Waste – Fraction
Source Separated Organics
Waste Hauler
LANDFILLS
MSW
Pre-Processing
Facility
OCSD
12-15 % Solids Slurry

7. Food Waste Co-Digestion Evaluation
Considered only pre-processed slurry
12-15% solids content slurry
Interim and permanent capacity evaluation
Gas production projection
Cost benefit analysis and tipping fee calculation

8. Recommended Food Waste Capacity and Benefit
Interim – 150 tpd, 6 trucks per day, 8 – 10% additional power generated, $1.5 M revenue generated per year from tipping fees
Permanent – 500 tpd, 20 trucks per day, 20 – 25% additional power generated, $5.0M revenue generated per year from tipping fees
Food waste is pumped from WM tanker trucks into closed, sealed storage tanks, controlling odors.
Picture of their food waste receiving station at LACSD

9. Biosolids Master Plan Recommendation – Co-Digestion
Interim High Strength Organic/Food Waste Receiving Station – 2019 – Plant 2
Permanent High Strength Organic/Food Waste Receiving Station – 2035 – Plant 2

10. P2-130: Ultimate Food Waste Receiving Facility (2035-2037)
WAREHOUSE
(2023) D E C F G H
THICKENDED SLUDGE FEED FACILITY
GAS COMP
FLARE
J-124
(2028)
BOILER J I K N
FERRIC CHLORIDE (2030)
BIOSOLIDS PERIMETER SCREENING (2021)
INTERIM FOOD WASTE
FOOD WASTE S R Q P
DIGESTERS I, J, K, REPLACEMENT (2037)
P2-130: Ultimate Food Waste Receiving Facility ( )
Additional capacity after installation of TPAD
Build food waste receiving facility to expand program
P2-124: Interim Food Waste Receiving Facility ( )
Food waste receiving facility by Digester S
250 tpd of pre-processed SSO slurry receiving facility
tpd of slurry initial contract
CLASS A BATCH TANKS
TPAD (2030)

11. Unescalated Construction Cost $ million
Initial Project Costs
Project
Unescalated Construction Cost $ million
Project Cost $ million
P2-91-1
Interim Digester Rehabilitation at Plant 2
29.5
49.2
P2-125
Plant 2 Southwest Perimeter Screening
1.3
2.8
P2-124
Interim Food Waste Receiving Facility
2.5
5.4
P2-126
Plant 2 Warehouse Relocation
5.1
9.8
P2-127
Plant 2 Collections Yard Relocation
0.6
P2-128
TPAD Digester Facility at Plant 2
154
423
P2-129
Digester P, Q, R, and S Replacement
56.7
153
P2-130
Food Waste Receiving Facility at Plant 2
5.6
15.4
P2-131
Digester I, J, and K Replacement
39.3
83.3
P2-132
Digester Demolition at Plant 2
7.3
19.0

12. Aerial Rendering

13. Questions?