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Cayucos Sustainable Water Project
Flows and Loading Update
Cayucos Sustainable Water Project
Flows and Loading Update
May 19, 2016
Ammonia ResultsAverage39 mg/LNo. of Samples45
Domestic Wastewater Strengths per: Wastewater Engineering: Treatment and Resource Recovery. Boston: McGraw‐Hill, 2014. Print.
Saturday(July 4th Holiday)
BOD ResultsAverage232 mg/LNo. of Samples42
SundayFriday
MondayFriday
Saturday(July 4th Holiday) Monday
SundaySaturday
Domestic Wastewater Strengths per: Wastewater Engineering: Treatment and Resource Recovery. Boston: McGraw‐Hill, 2014. Print.
TSSResultsAverage149 mg/LNo. of Samples45
Domestic Wastewater Strengths per: Wastewater Engineering: Treatment and Resource Recovery. Boston: McGraw‐Hill, 2014. Print.
Sunday following July 4th
Sunday
Cayucos Sustainable Water Project
Treatment Process Alternatives Evaluation
Cayucos Sustainable Water Project
Treatment Process Alternatives Evaluation
May 19, 2016
Presentation Overview• Wastewater Treatment Process Overview• Feasible Technologies Screening• Treatment Process Alternatives
– Process Flow Diagrams– Existing Installations
Wastewater Treatment Process Overview
Unrestricted Irrigation
PotableReuse
Headworks Biological Nutrient Removal Filtration
Advanced Treatment
Feasible Technology Screening Evaluation
Qualitative CriteriaAdaptability for Potable Reuse
Operational FlexibilityMaintenance Requirements
Chemical NeedsOdor
FootprintGHG Emissions/Energy Efficiency
Treatment Process AlternativesBiological 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
Headworks*
*For CAS only
Biological Nutrient Removal (BNR)Alternative 1 ‐ CAS City of Soledad, CA
Advantages• Best documented and most widely used• Many operational variants• Simple design and operationDisadvantages• Large footprint• Susceptible to process upsets due to
load and flow variations
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 operateDisadvantages• Large footprint• Difficult to modify/expand
Biological Nutrient Removal (BNR)Alternative 3 ‐ MBR
Advantages• Provides tertiary treated water
suitable for reuse after disinfection• Combines biologic treatment and
filtration• Compact footprintDisadvantages• Energy intensive• High O&M cost
Filtration A B C
B
DisinfectionA C
Phase II ‐ Full Advanced Treatment
Alternative 1 Conventional Activated Sludge
Alternative 2Oxidation Ditch
Alternative 3MBR
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
Alternative 1 Conventional Activated Sludge
Alternative 2Oxidation Ditch
Alternative 3MBR
