SLIDE 1
Cayucos Sustainable Water Project
Flows and Loading Update
Cayucos Sustainable Water Project
Flows and Loading Update
May 19, 2016
Cayucos Sustainable Cayucos Sustainable Water Project Water - - PowerPoint PPT Presentation
Cayucos Sustainable Cayucos Sustainable Water Project Water - - PowerPoint PPT Presentation
Cayucos Sustainable Cayucos Sustainable Water Project Water Project Flows and Loading Update Flows and Loading Update May 19, 2016 Saturday Ammonia (July 4 th Holiday) Results Average 39 mg/L No. of Samples 45 Domestic Wastewater
SLIDE 2
SLIDE 3
Ammonia Results
Average 39 mg/L
- No. of Samples
45
Domestic Wastewater Strengths per: Wastewater Engineering: Treatment and Resource
- Recovery. Boston:
McGraw‐Hill, 2014. Print.
Saturday (July 4th Holiday)
SLIDE 4
BOD Results
Average 232 mg/L
- No. of Samples
42
Sunday Friday Monday Friday Saturday (July 4th Holiday) Monday Sunday Saturday Domestic Wastewater Strengths per:
Wastewater Engineering: Treatment and Resource Recovery. Boston: McGraw‐Hill,
- 2014. Print.
SLIDE 5
TSS Results
Average 149 mg/L
- No. of Samples
45
Domestic Wastewater Strengths per: Wastewater Engineering: Treatment and Resource
- Recovery. Boston:
McGraw‐Hill, 2014. Print.
Sunday following July 4th Sunday
SLIDE 6
Cayucos Sustainable Water Project
Treatment Process Alternatives Evaluation
Cayucos Sustainable Water Project
Treatment Process Alternatives Evaluation
May 19, 2016
SLIDE 7
Presentation Overview
- Wastewater Treatment Process Overview
- Feasible Technologies Screening
- Treatment Process Alternatives
– Process Flow Diagrams – Existing Installations
SLIDE 8
Wastewater Treatment Process Overview
Unrestricted Irrigation Potable Reuse Headworks Biological Nutrient Removal Filtration Advanced Treatment
SLIDE 9
Feasible Technology Screening Evaluation
Qualitative Criteria Adaptability for Potable Reuse Operational Flexibility Maintenance Requirements Chemical Needs Odor Footprint GHG Emissions/Energy Efficiency
SLIDE 10
Treatment Process Alternatives
Biological Process Alternatives
- Alternative 1 – Conventional Activated Sludge (CAS)
- Alternative 2 – Oxidation Ditch
- Alternative 3 – Membrane Bioreactor (MBR)
Los Osos, CA City of Soledad, CA City of Fillmore, CA
SLIDE 11
Headworks
*
*For CAS only
SLIDE 12
Biological Nutrient Removal (BNR)
Alternative 1 ‐ CAS
City of Soledad, CA
Advantages
- Best documented and most widely used
- Many operational variants
- Simple design and operation
Disadvantages
- Large footprint
- Susceptible to process upsets due to
load and flow variations
SLIDE 13
Biological Nutrient Removal (BNR)
Alternative 2 – Ox‐Ditch
BBARWA, Big Bear, CA
Advantages
- Proven technology
- Resilient under flow and load variations
- Low O&M cost for small plants
- Reliable and simple to operate
Disadvantages
- Large footprint
- Difficult to modify/expand
SLIDE 14
Biological Nutrient Removal (BNR) Alternative 3 ‐ MBR
Advantages
- Provides tertiary treated water
suitable for reuse after disinfection
- Combines biologic treatment and
filtration
- Compact footprint
Disadvantages
- Energy intensive
- High O&M cost
SLIDE 15
Filtration
A B C
SLIDE 16
B
Disinfection
A C
SLIDE 17
Phase II ‐ Full Advanced Treatment
SLIDE 18
Alternative 1 Conventional Activated Sludge
SLIDE 19
Alternative 2 Oxidation Ditch
SLIDE 20
Alternative 3 MBR
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Next Steps
- Evaluate economic considerations
- Refine and evaluate alternatives based on identified criteria
– Capital Cost – Life Cycle Cost – Adaptability for Potable Reuse – Operational Flexibility – Maintenance Requirements – Chemical Needs – Odor – Footprint – GHG Emissions/Energy Efficiency
- Bring recommendation to Board
SLIDE 22
Alternative 1 Conventional Activated Sludge
SLIDE 23
Alternative 2 Oxidation Ditch
SLIDE 24