Southern California Regional Brine-Concentrate Management Study - - PDF document

▶

Aug 17, 2023 39 likes •198 views

Southern California Regional Brine-Concentrate Management Study Southern California Area Office Approx. 60% of Californias 38.05 million citizens live in the SCAO region Regional economy: $600+ billion Approx. 900,000 acres of

SLIDE 1

Southern California Regional Brine-Concentrate Management Study

Approx. 60% of

California’s 38.05 million citizens live in the SCAO region

Regional economy: $600+

billion

Approx. 900,000 acres of

irrigated land

Southern California Area Office

SLIDE 2

Southern California Area Office Challenges

Providing Water for

Future Needs

Brine Concentrate

Management

Watershed Management Implementing the Colorado

River Plan

Implementing CALFED/Bay

Delta

Tribal Needs

Local Resource Development
Climate Change

SLIDE 3

Drought Forecast H2O Supply

Colorado
Sierra
SWP/CVP
Local

SLIDE 4

Southern California Balancing Scarce Water Supplies

Growing demands Diminishing supply reliability Regulatory issues Local water augmentation strategies Emerging rural demands Help drought proof the region

San Diego San Diego San Diego

Where can we increase local supplies and reduce import dependence?

Ocean desalination Brackish groundwater desalination Recycle – Reuse

How to manage the brine-concentrate?
Economic
Environmental
Regulatory

SLIDE 5

USBR’s Regional Recycled Water Studies

Southern California Water Recycling and Reuse

Study (SCCWRRS)

– Title XVI Authorization – 8 Year Planning Effort Beginning in 1993 – Goal: To Promote More Efficient Use of Total Water Resources by Increasing Use of Reclaimed Water

SCCWRRS Project Participants

Led by the U.S. Bureau of Reclamation In Conjunction With 8 State and Local Water Agencies

U.S. Bureau of Reclamation CDWR CBMWD & WBMWD City of Los Angeles City of San Diego MWDSC SDCWA SOCRA SAWPA

SLIDE 6

SCCWRRS Study Area

6 Counties 118 WWTP Approximately 4 Million AFY Supply 7300 Demand Locations

Goals of SCCWRRS

Phase IA

Data Collection Data Analysis

Phase IB

Feasibility of Regional Recycling Identify Opportunities to Maximize Reuse Alternatives Analysis Identify Constraints to Regional Recycling

Phase II

Develop Regional Coalition Identify Projects for Short-Term Implementation Further Identify Constraints to Local and Regional Recycling Institutional, Financial, Regulatory, Public Acceptance

SLIDE 7

SCCWRRS Phase IB - Conclusions

Projected Long-Term Shortfalls Maximizing Reuse Increases Costs Brine Disposal Develop Regional Reclaimed Water Strategic Plan

Identify Mini-regional Strategies San Diego, Inland Empire, LA Basin, Orange County Identify Projects for Short-Term Implementation (2010) Investigate Need for Regional Salinity Management and Brine Disposal System Short and Long-Term Perspectives

SCCWRRS Phase II - Project Approach

SLIDE 8

Short-Term Implementation Plans

15 Regional and 19 Single-Agency Projects Over 451,000 Acre-Feet of Annual Yield

Continue to be Limited by Demands Constraints

Regulations Public Perceptions Institutional Issues Financial Resources Investing in an Uncertain Future Equity Issues - Local Investment vs. Regional Benefit

SCCWRRS Phase II - Conclusions The Southern California Water Recycling Projects Initiative

What was the Initiative? Regional Component

Water Quality Analysis Negative Branding

Local Component

Recycled Water Project Implementation Strategies Successful Public Information & Education Implementation Strategies Financial Support Opportunities Project Specific Work

SLIDE 9

The Initiative

Executive Management Team (IEMT) Local Agency Involvement

Provide Feedback via IEMT Led by the U.S. Bureau of Reclamation In Conjunction With 12 State and Local/Area Water and WW Agencies

OCSD BBARWA LACSD U.S. Bureau of Reclamation CBMWD & WBMWD City of Los Angeles City of San Diego MWDSC SDCWA SOCWA SAWPA CDWR Yucaipa Valley MWD

Partnered with Over 55 Local Agencies

The Initiative

Overall Objectives

Support Implementation of Local Agency Efforts in Planning of Recycled Water Projects Further Develop Regional Coalition Examine Recycled Water Issues on a Local and Regional Basis Develop Tools and Information to Support Recycled Water project Implementation

SLIDE 10

The Initiative – Water Quality

IEMT Identified Regional Water Quality Issues

Salinity Brine Disposal Water Chemistry/Constituents Regulations Level of Use - How Much is Too Much? Use Types

Performed Research

Reviewed Over 300 Documents

Developed WQ Analysis Report

The Initiative – Water Quality Analysis

Data Sources

Over 102 Wastewater/Reclamation Facilities Over 150 NPDES Permits Over 28 Desalination or Desalting Plants Over 96 Groundwater Sub-Basins Five Regional Water Quality Control Board Basins

Region 4 – Los Angels Region 6 – Lahontan Region 7 – Colorado River Region 8 – Santa Ana Region 9 – San Diego

SLIDE 11

The Initiative – Brine/Concentrate Projections

Developed 3 Scenarios

Moderate Moderate Increase in Effluent Discharges Moderate Expansion Recycled Water Use (GW = 100%) Desalters Online by 2010 Existing Water Conservation Levels Maximum Long-term Increase of Effluent Discharges Aggressive Expansion of Recycled Water Use (GW = 100%) Implementation of Planned and Proposed Desalters High of Water Conservation Levels Extreme - Regulation Changes are Aggressive Advanced Treatment of Inland WWTP Discharges Advanced Treatment of All Imported Water and WWTP Flows

Brine/Concentrate Projections

SUMMARY OF PROJECTED BRINE/CONCENTRATE FLOW GENERATION

Brine/Concentrate Generating Processes Moderate Scenario Maximum Scenario Extreme-Case Scenarios Condition 1 - Inland Discharged Wastewater Flows Condition 2 - All Wastewater Flows Brine/Concen. Generation Brine/Concen. Generation Brine/Concen. Generation Brine/Concen. Generation (mgd) (mgd) (mgd) (mgd) Total Wastewater Discharges and Groundwater Desalters 43.7 285.3 358.5 711 Other Brine/Concentrate Sources Seawater Desalination 79.8 79.8 79.8 Imported Water 1,221.0 Total All Sources 43.7 365.1 438.3 2,011.8

SLIDE 12

The Initiative – Water Quality Analysis Conclusions

Increased brine-concentrate mgt costs lead to increased recycled water costs Increased brine-concentrate flows are projected if more stringent water quality regulations are imposed Future water recycling may be limited by advanced treatment & brine-concentrate mgt Ocean disposal via brinelines remains the most feasible solution Water quality regulations, brineline capacity and limits on

cean disposal will drive need for volume reduction and

ZLD solutions, and their evaluation for large flow applications

Southern California Regional Brine- Concentrate Management Study

California Department of Water Resources
Central Basin Municipal Water District
City of San Bernardino Water Department
City of San Diego Water Department
County Sanitation District No. 2 of Los Angeles County
Inland Empire Utilities Agency
Irvine Ranch Water District
Lake Arrowhead Community Services District
Los Angeles Department of Water and Power
Metropolitan Water District of Southern California
Orange County Sanitation District
Otay Water District
Rancho California Water District
San Diego County Water Authority
Santa Ana Watershed Project Authority
Southern California Salinity Coalition
West Basin Municipal Water District
Western Municipal Water District

SLIDE 13

Brine Study

Study Objectives & Benefits

Provide a current picture of the southern California brine- concentrate management and regulatory landscape Forecast expected disposal capacity and new water source requirements through 2030

Brine Study

Study Objectives & Benefits

Forecast regulatory, treatment and disposal trends in emerging/secondary constituents Update information on applicable brine-concentrate treatment and disposal options recommended by the Southern California Water Projects Initiative Report to meet forecasted demands

SLIDE 14

Brine Study

Study Objectives & Benefits

Identify potential joint energy and water/wastewater opportunities Potentially facilitate the development of new brackish groundwater resources Potentially provide a means of removing salt loadings from the sewer systems upstream of water recycling plants, thereby improving the plant's product water quality

Brine Study

Study Objectives & Benefits

Potentially promote economic growth through analysis, forecasting and project recommendations of brine-concentrate

ptions to meet existing and future residential, commercial and

industrial development requirements for reliable water supplies and a safe and efficient method of treating and disposing of brine-concentrates

SLIDE 15

end

Applicable Level of Brine/Concentrate Management Technologies

Local Subregional (Small) Subregional (Large) Regional Liquid Residuals Producing Processes Electrodialysis Reversal X X Vibratory Shear Enhanced Processing X Precipitative Softening / Reverse Osmosis X X Brine Concentrator X Enhanced Membrane X X Solid Residuals Producing Processes Natural Treatment System X Halophyte X X Evaporation Ponds X X Enhanced Evaporation Ponds X X Conventional Zero Liquid Discharge X X Enhanced Membrane Thermal System Zero Liquid Discharge X X No Residual Alternatives Producing Processes Deep Well Injection X X Ocean Discharge (Existing) X X X X Ocean Discharge (New) X X Downstream Discharge (Existing) X X X X Downstream Discharge (New) X X Landfill X X X X Management Strategy Level Technology Option