Encina Wastewater Authority’s Recycling Program

SAN DIEGO WATER BOARD MEETINGJUNE 12, 2019

2018• 6,251 Dry Metric Tons (dmt) produced

• 5,172 dmt Class A to Yuma

• 518 dmt Class B to Yuma

• 560 PureGreen to Nurseries, Fertilizer wholesaler’s, FAA

2019 Imperial Country measure X repealed. 2019 650 dmt to IC.

Class A product has tendency to reheat.

Digester cleaning and rehabilitation project.

Biosolids

Co-Generation2018• 14,993 Mwh 236,067,000 standard cubic feet

2017

• 13,482 Mwh 210,640,000 scf

2016

• 12,963 Mwh 203,226,000 scf

December 2017 digester gas annual limit was increased to 280 million scf from 224 million scf.

Alternative fuel receiving facility currently accepts brewery waste and FOG from grease traps.

WATER REUSE FEASIBILITY STUDY, Scott McClelland

EWPCF Projected Flows from Recent Process Master Plan

DEPARTMENT NAME ALL CAPS, Presenter Name

15

20

25

30

35

40

45

1985 1990 1995 2000 2005 2010 2015 2020 2025 2030 2035 2040

Flow

(mgd

)

Historical Flow Project Flow by Population Growth Projected Flow by Linear Regression

Projected flow by 2040

Phase V Design Capacity

Maximize Non-Potable Reuse of EWPCF Effluent(2040 Summer Flows)

18.5 mgd

10 mgd

2.5 mgd

Maximize use of EWPCF with Potable Reuse(2040 Summer Flows)

15.7 mgd

2.0 mgd20.5 mgd

2.8 mgd

Potable Reuse Receptor(s)

10 mgd

2.5 mgd

(to outfall)

Context:Water in San Diego

EWA Service Area

WATER AGENCIES WASTEWATER AGENCIES

Carlsbad MWD (City) City of Carlsbad

Olivenhain MWD Leucadia WWD

San Dieguito WD (Encinitas)

Encinitas SD (City)

Vallecitos WD Vallecitos WD

Vista ID City of VistaBuena SD (City of Vista)

EWPCF

EWA Service Area

SDCWA MAs:

EWA Member Agencies

SDCWA Agencies in EWA service area

NEXT STEPS TO ADVANCE THE REUSE PROJECT• Develop partnerships with water agencies

• Identify institutional arrangements needed (e.g., MOUs)

• Explore funding opportunities:• Federal (USBR, USACE)

• State (IRWM, DWR, SRF)

• SDCWA/ MWDSC (LRP, LWSD, LWSIP)

• Private investment (Poseidon, P3s)