1. PROJECT OVERVIEW Liquids Stream Solids Stream
Potential Area for Solids Stream Improvements
Liquids just upgraded, but solids stream untouched as part of project. Because of aging, the incinerators need to be replaced. City taking the opportunity to look at replacement options beyond “in kind” and ones that offer resource recovery opportunity, which is in keeping with City environmental ethic.
<UPDATE SCHEDULE TO SHOW : Permitting and Design
: Construction>
Brown and Caldwell

2. Existing Solids Stream Process
Centrifuge to dewater solids
Ash to landfill disposal
Aging incinerator
Brown and Caldwell

3. Resources Biogas as fuel for cogeneration
Biosolids – Manufactured Topsoil
Biogas - Vehicle Fueling Station
Brown and Caldwell 3

4. Land Application (e.g., “loop”)
ALTERNATIVES
Boiler
Land Application (e.g., “loop”)
Anaerobic Digester
Brown and Caldwell

5. High Level Screening Alternatives and Results
Solids Stabilization
Anaerobic digestion
Aerobic digestion
Lagoons
Alkaline stabilization
Composting
Incineration
Gasification
Pyrolysis
Hydrothermal Liquefaction
Supercritical water oxidation
Primary End Use
Land application (e.g., loop)
Soil Amendment (e.g., composting, TAGRO)
Dried fertilizer product (e.g., SoundGRO)
Dried fuel product
Landfill
Liquid fertilizer
Bioplastic production
Alternative fuel products
Primary Biogas Use
Cogeneration
Power
Process and Building Heating
Gas Upgrading
Vehicle fuel
Pipeline injection
Boiler
Flare
Brown and Caldwell

6. TBL+ Criteria Environmental Financial Social Technical
(Healthy Environment)
E1 – Minimize Carbon Footprint
E2 – Protect Air Quality
E3 – Maximize Resource Recovery
E4 – Minimize Energy Usage
E5 – Protect Local Habitat
Financial
(Quality, Responsive Services,
Vibrant Sustainable Economy)
F1 – Optimize System Value
F2 – Maintain Affordability
F3 – Minimize Market Sensitivity
Social
(Sense of place,
Safe and Prepared Community)
S1 – Minimize Noise
S2 – Minimize Odor
S3 – Minimize Truck Traffic
S4 – Minimize Visual Impacts
S5 – Minimize Toxin Exposure
Technical
(Quality, Responsive City Services)
T1 – Proven Reliability
T2 – Minimize Post Point Impacts
T3 – Maintain Flexibility
T4 – Minimize Complexity