Protecting the environment. Preserving the coast. SAN ELIJO JOINT - - PowerPoint PPT Presentation

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Protecting the environment. Preserving the coast. SAN ELIJO JOINT - - PowerPoint PPT Presentation

Oct 04, 2023 141 likes •538 views

Protecting the environment. Preserving the coast. SAN ELIJO JOINT POWERS AUTHORITY Recycled Water Program Advanced Water Treatment Michael T. Thornton, P.E. General Manager 2 Who We Are Wastewater Service Area San Elijo JPA Member

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Protecting the environment. Preserving the coast.

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Recycled Water Program

Advanced Water Treatment

SAN ELIJO JOINT POWERS AUTHORITY

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Michael T. Thornton, P.E. General Manager

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Who We Are…

San Elijo JPA

  • Member Agencies

 City of Encinitas  City of Solana Beach

  • Board of Directors

 Chair Tom Campbell  Vice-Chair Mark Muir  Teresa Barth  David Zito

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Wastewater Service Area

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What We Do…

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Vision - “We pursue innovative practices to

produce clean water in an environmentally, socially, and fiscally responsible manner."

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A History of Coastal Stewardship

Until the early 1950’s, sewage was discharged into the lagoon and coastal waters for Cardiff and Solana Beach. San Elijo Water Pollution Control Facility was built in 1965 in response to water pollution in the San Elijo Lagoon.

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Serving Today, Planning for Tomorrow.

Moving beyond wastewater treatment & disposal paradigm; the San Elijo JPA is focusing on maximizing recycling.

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RECYCLED WATER PROGRAM

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  • Produces approx. 1350 AFY
  • Operated in Partnership with other local

districts and cities

 San Dieguito Water District  Santa Fe Irrigation District  Olivenhain Municipal Water District  City of Del Mar

  • Reduces Ocean Discharge by 40%
  • Strong Community Support
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San Elijo Water Reclamation Facility

Recycled Water Monthly Demands

Acre – Feet/Month

50 100 150 200 250 300 350 jan feb mar apr may jun jul aug sep

  • ct

nov dec Ocean Discharge Recycled

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RECYCLED WATER SERVICE AREA

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RECYCLED WATER SERVICE AREA

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Customer Include:

 Del Mar Fairgrounds  Golf Courses  Caltrans  Schools  Parks  Business Parks  HOAs

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RECYCLED WATER SERVICE AREA

Potential New Markets

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PROGRAM CHALLENGES

  • Maintain Financial Sustainability
  • Develop & Grow the Program
  • Maintain Excellent Water Quality
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TOTAL DISSOLVED SOLIDS (TDS)

Measurement of dissolved salts and minerals (e.g. calcium, magnesium, sulfate, chloride, sodium, etc.) in the water.

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TOTAL DISSOLVED SOLIDS (TDS)

Measurement of dissolved salts and minerals (e.g. calcium, magnesium, sulfate, chloride, sodium, etc.) in the water.  Not a risk to human health  Most plants have a limited tolerance  Can impact some industrial processes  Can limit the use of recycled water

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ADVANCED WATER TREATMENT (AWT)

Treatment System

 Microfiltration (PALL )  Reverse Osmosis

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ADVANCED WATER TREATMENT (AWT)

Treatment System

 Microfiltration (PALL )  Reverse Osmosis

AWT parallels existing recycled water sand filtration system New RW capacity = 3.0 MGD

 (expandable to 3.5 MGD)

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ADVANCED WATER TREATMENT

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Build Footprint: ~5,000 sq ft System Startup: April 2013 Cost: $5 million Grant: $850,000

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THE PROJECT

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DynaSand Filtration Chlorine Disinfection

Existing RW Treatment Train

Wastewater Treatment

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THE PROJECT

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DynaSand Filtration Chlorine Disinfection

Existing RW Treatment Train

AWT Filtration

New RW Treatment Train

Wastewater Treatment

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THE PROJECT

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DynaSand Filtration Chlorine Disinfection

Existing RW Treatment Train

AWT Filtration

New RW Treatment Train

Wastewater Treatment

Design provides:

Operational flexibility Cost effective (E&C) Expandability New Opportunities

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THE PROJECT

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DynaSand Filtration Chlorine Disinfection

Existing RW Treatment Train

AWT Filtration

Future Opportunities?

Wastewater Treatment

Design provides:

Operational flexibility Cost effective (E&C) Expandability New Opportunities

IPR

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Better Wastewater = Better Recycled Water

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Addition of an Anaerobic Selector in the Activated Sludge Bioreactor has removed P from an average of 4.8 mg/l to less than 0.5 mg/l

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IMPROVING COST EFFECTIVENESS

Wastewater treatment process was improved to produce “best water quality” for membrane filtration. RESULTS:

Low turbidity/more filterable water Reduced levels of orthophosphate (reduces scaling) Reduced chemical and energy use in secondary

treatment process

Improved treatment process stability (reduced variance

in treated water quality)

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Significant Power Savings Realized

90,000 110,000 130,000 150,000 170,000 190,000 210,000 Power Usage (kWh) Month

Power Usage (kWh) w/o Recycled Water

2005 2009

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Significant Power Savings Realized

90,000 110,000 130,000 150,000 170,000 190,000 210,000 Power Usage (kWh) Month

Power Usage (kWh) w/o Recycled Water

2005 2009 2010

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Significant Power Savings Realized

90,000 110,000 130,000 150,000 170,000 190,000 210,000 Power Usage (kWh) Month

Power Usage (kWh) w/o Recycled Water

2005 2009 2010 2011

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Significant Power Savings Realized

Current cost of biological treatment: 45.6 kW/MG (61 hp/MG) $109/MG, $107/acre-ft

90,000 110,000 130,000 150,000 170,000 190,000 210,000 Power Usage (kWh) Month

Power Usage (kWh) w/o Recycled Water

2005 2009 2010 2011 2012

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Partial Nitrification

Maximizing Treatment Performance: Temperature for SRT Target

Mixed Liquor Temp (F)

SRT (days)

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Seasonal Treatment Performance

Target SRT ~ 1.5 days in summer Target SRT ~ 2.5 days in winter Month Monthly Avg Secondary Effluent Turbidity (NTU)

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Secondary Effluent Improvements

*Implemented SRT based on temperature May 2011 Monthly Avg Secondary Effluent Turbidity (NTU) Month

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PHOSPHOROUS REMOVAL

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Anaerobic Selector

resulted in biological removal of phosphorous. Reduces: Chemicals & labor associated w/filter cleaning.

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Treatment Optimization Results – Better Treatment - Lower Cost

 Energy use reduced by ~800,000 kWh annually (or

40% reduction to achieve 61 HP/MG)

 Well flocculated biology - no need for chemical

addition to control settling (no polymer or NaOCl)

 Temperature adjusted SRT produces consistent

effluent quality without nitrifying

 Significant improvements to water quality reduces

the need for chemicals for filtration

 Provides bio-P removal at low SRT

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MAXIMIZING COMMUNITY BENEFITS

AWT provides the ability to do more than just produce “really clean” recycled water. New opportunity to strategically capture and treat urban runoff

Urban Runoff is one of the leading reasons for Beach and

Lagoon pollution.

Impacts the City’s storm water permit compliance Collaborated with the cities on a solution that leverages

the treatment capacity of the proposed AWT.

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URBAN RUNOFF TREATMENT

San Elijo Water Reclamation Facility

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URBAN RUNOFF TREATMENT

Storm Water System

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URBAN RUNOFF TREATMENT

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URBAN RUNOFF TREATMENT

  • Construct diversion systems
  • Use existing sewer system
  • Treat at the SEWRF
  • Protect coast waters
  • New water to recycle
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PROJECT PROGRESS

Design Completed (Kennedy/Jenks) Peer Review (Trussell Technology) Financial Feasibility Analysis (GDH) CEQA documentation completed (DUDEK) Grant funding awarded Project financing secured Construction Initiated

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Questions

SAN ELIJO JOINT POWERS AUTHORITY

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Wastewater, storm water, recycled water… Providing Clean Water for the Future.