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 Strengths per: Wastewater Engineering: Treatment and Resource Recovery. Boston: McGraw‐Hill, 2014. Print.

Saturday Monday (July 4 th Holiday) BOD Sunday Saturday Results Average 232 mg/L No. of Samples 42 Sunday Monday Friday Friday Domestic Wastewater Strengths per: Wastewater Engineering: Treatment and Resource Recovery. Boston: McGraw‐Hill, 2014. Print.

Sunday Sunday following TSS July 4 th Results Average 149 mg/L No. of Samples 45 Domestic Wastewater Strengths per: Wastewater Engineering: Treatment and Resource Recovery. Boston: McGraw‐Hill, 2014. Print.

Cayucos Sustainable Cayucos Sustainable Water Project Water Project Treatment Process Treatment Process Alternatives Evaluation 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 Advanced Biological Nutrient Headworks Filtration Treatment Removal Unrestricted Potable Irrigation Reuse

Feasible Technology Screening Evaluation Qualitative Criteria Adaptability for Potable Reuse Operational Flexibility Maintenance Requirements Chemical Needs Odor Footprint GHG Emissions/Energy Efficiency

Treatment Process Alternatives Biological Process Alternatives • Alternative 1 – Conventional Activated Sludge (CAS) • Alternative 2 – Oxidation Ditch • Alternative 3 – Membrane Bioreactor (MBR) City of Fillmore, CA City of Soledad, CA Los Osos, 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 operation Disadvantages • 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 operate Disadvantages • 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 footprint Disadvantages • Energy intensive • High O&M cost

Filtration A B C

Disinfection A C B

Phase II ‐ Full Advanced Treatment

Alternative 1 Conventional Activated Sludge

Alternative 2 Oxidation Ditch

Alternative 3 MBR

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 2 Oxidation Ditch

Alternative 3 MBR