Water S Sustainability ty De Design f for Arch chitect cts - - PowerPoint PPT Presentation
Water S Sustainability ty De Design f for Arch chitect cts Presented by Taylor Chang | San Francisco Public Utilities Commission 1 Desig esign f for or Water er AIA Framework for Design Excellence: Sustainable design conserves and
Presented by Taylor Chang | San Francisco Public Utilities Commission
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AIA Framework for Design Excellence:
Sustainable design conserves and improves the quality of water as a precious resource.
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Learn about the National Blue Ribbon Commission for Onsite Non-potable Water Systems’ innovative and collaborative approach to addressing key design, implementation, regulatory, and water quality challenges to onsite water reuse to create consistency across the United States. Explore the risk-based approach used to develop treatment requirements and monitoring approaches. Learn about the soon to be released guidance manual and training materials, which teaches designers, developers, operators, and regulators the knowledge and skills to safely implement decentralized water systems. Discover steps to reducing potable water use and to determine what is really needed. Do we really need to irrigate a lawn, or can we plant self- sufficient natives instead? Do we need to use potable water in our chiller, or can we use captured rainfall or collected condensate?
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ADVANCING ONSITE WATER REUSE & LESSONS LEARNED
Taylor Chang
San Francisco Public Utilities Commission
February 26, 2020
San Francisco Public Utilities Commission
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Water: delivering high quality water every day to 2.7 million people Power: generating hydropower and solar power Wastewater: protecting public health and the environment
Challenges to Future Water Supply Reliability
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OneWaterSF: Moving from a Linear Approach to Integrated Planning and Implementation
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Traditional Resource Management OneWaterSF
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San Francisco’s Local Water Program
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Buildings Generate Resources, Not Waste
Wastewater from toilets, dishwashers, kitchen sinks, and utility sinks Wastewater from clothes washers, bathtubs, showers, and bathroom sinks Precipitation collected from roofs and above-grade surfaces Precipitation collected at or below grade Nuisance groundwater from dewatering operations
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Pioneering Onsite Water Reuse at SFPUC Headquarters
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San Francisco’s Evolving Onsite Water Reuse Program
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181 Fremont, San Francisco
Graywater and Rainwater for Flushing and Irrigation 1.3M GPY Potable Offset
Source: Jay Paul Company and Heller Manus Architects
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1500 Mission, San Francisco
Graywater and Rainwater for Flushing and Irrigation 2.5M GPY Potable Water Offset
Source: Aquatecture
Salesforce Tower, San Francisco
Blackwater for Flushing, Cooling, and Irrigation 7.8M GPY Potable Offset
Source: Aquacell
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Moscone Convention Center, San Francisco
Foundation Drainage and Condensate for Flushing, Irrigation, and Street Sweeping 11M GPY Potable Offset
Source: Skidmore, Ownings & Merrill LLP with Mark Cavagnero Associates
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Chase Center, San Francisco
Rainwater, Stormwater, Graywater, and Condensate for Flushing 3.7M GPY Potable Offset
Source: Golden State Warriors
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Onsite Water Reuse Key Lessons Learned
General Public
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Source: Golden State Warriors
Onsite Water Reuse Lessons Learned Key Program Elements
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Onsite Water Reuse Lessons Learned Water Quality and Treatment Design
water quality standards
pathogens that can impact public health (protozoa, bacteria, and virus)
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Source: US EPA
Onsite Water Reuse Lessons Learned Water Quality and Treatment Design
blackwater can reduce TSS, turbidity and BOD; improve UV Transmittance; and can reduce ammonia
600 mg/L
uses, e.g. toilet flushing
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Graywater and Blackwater Treatment
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Onsite Water Reuse Lessons Learned Water Quality and Treatment Design
planter can create issues with color and turbidity
to prevent mosquito growth
potable water helps avoid dry season stagnation
Source: Port of SF
Onsite Water Reuse Lessons Learned Key Utility Considerations
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Onsite Water Reuse Lessons Learned Operator Capacity
both traditional water and wastewater technologies
acknowledging they possess appropriate knowledge, skills, and training
project owners, and engineers about ongoing O&M costs and responsibilities
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Source: San Francisco Public Utilities Commission
Onsite Water Reuse Lessons Learned Develop Technical and Financial Assistance
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Onsite Water Reuse Lessons Learned Share Learning with Designers and Vendors
commercial buildings as opposed to graywater can achieve significantly higher potable water savings
Source: San Francisco Public Utilities Commission
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Onsite Water Reuse Lessons Learned Public Education
engage occupants and visitors about conserving water with
Source: San Francisco Public Utilities Commission
Onsite Water Reuse Lessons Learned Resource Recovery Opportunities
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Wastewater Heat Recovery: The extraction of thermal energy from warm wastewater, and subsequent beneficial use of this energy to offset building energy use for applications such as hot water heating or space heating/cooling Warm non-potable water Cooled non-potable water Cold potable water Pre-heated potable water
Onsite Water Reuse Lessons Learned Wastewater Heat Recovery
needed for treatment
space heating & cooling systems
potential energy offset that can be achieved with wastewater heat recovery in the grant application
heat if applying for an Onsite Water Reuse grant
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Brewery Process Water Reuse
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to produce 1 gallon of beer
contains guidance on brewery process water reuse
Source: Water & Wastes Digest
Brewery Process Water Reuse Need for New Strategy to Protect Public Health
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four key elements to ensure public health protection:
PureWaterSF Researching Direct Potable Reuse at the Building Scale
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PureWaterSF Findings: Water Quality and Treatment Performance
Pharmaceuticals & other CECs are removed well through treatment train
Below Detection Below Detection
Chemicals are below regulatory limits in finished water >1,300 individual analyses performed Treatment processes achieved pathogen removal goals
Atmospheric Water Generation Additional Opportunity to Produce Water Onsite
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Hangar 1 Fog Point Vodka made with captured fog
Source: Zero Mass Water
AWG at the Denver Botanic Garden
Source: San Francisco Public Utilities Commission
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National Blue Ribbon Commission for Onsite Non-potable Water Systems
Source: San Francisco Public Utilities Commission
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National Blue Ribbon Commission Address Key Issues
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Varying Water Quality Standards Across the US
Source: Jay Garland, US EPA
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Independent Expert Panel Developed a risk-based water quality approach for onsite non- potable water systems
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Pathogen Log Reduction Targets (LRTs) Continuous online monitoring Treated water quality standards
Pathogen Log Reduction Targets
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Target safe pathogen level is the same regardless of source water Source waters have different starting pathogen concentrations Log reduction target is the difference between the starting point and the safe end point LOG REDUCTION TARGET
Enteric Viruses Parasitic Protozoa Enteric Bacteria Blackwater
Outdoor use 8.0 7.0 6.0 Indoor use 8.5 7.0 6.0
Graywater
Outdoor use 5.5 4.5 3.5 Indoor use 6.0 4.5 3.5
Roof Runoff
Outdoor use N/A N/A 3.5 Indoor use N/A N/A 3.5
Stormwater
Outdoor use 3.0 2.5 2.0 Indoor use 3.5 3.5 3.0
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Pathogen Log Reduction Targets for Various Water Sources & End Uses
Example Graywater System Treatment Train
Source: San Francisco Public Utilities Commission
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Model Regulations for Consistency Across the US
Guidelines for Stormwater
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California State Water Board Regulation Timeline
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Technical Advisory Panel in place
General external stakeholder outreach
Begin Rulemaking process
End of Rulemaking process, Regulation becomes effective
Guidance Manual for Onsite Water Reuse
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ANTICIPATED RELEASE EARLY 2020
Key Stakeholders Addressed
Guidance Manual for Onsite Reuse What You Can Expect to Find
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CLEAR DESCRIPTION OF CRITICAL TOPICS Risk-Based Water Quality Standards Basis for Log Reduction Targets Pathogen Crediting Frameworks
Guidance Manual for Onsite Reuse What You Can Expect to Find
discussion of pathogen crediting
to streamline implementation
monitoring
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Guidance Manual for Onsite Reuse What You Can Expect to Find
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EXAMPLE TREATMENT TRAINS
Blackwater Treatment Train
Guidance Manual for Onsite Reuse What You Can Expect to Find
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STAKEHOLDER-SPECIFIC TIPS AND KEY MESSAGES
Guidance Manual for Onsite Reuse What You Can Expect to Find
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COMMISSIONING AND OPERATIONS GUIDANCE
Types of System Alarms Example Commissioning Plan Checklist
PROGRAM IMPLEMENTATION AND REGULATORY GUIDANCE
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Guidance Manual for Onsite Reuse What You Can Expect to Find
National Blue Ribbon Commission Future Research Priorities
sources (e.g. condensate) and end uses (e.g. cooling tower make-up)
certificate/certification program
frameworks for commonly used treatment processes in onsite water systems
treatment systems (e.g. wetland treatment systems)
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Source: San Francisco Public Utilities Commission
Collaboration Leads to New Opportunities
NSF, USGBC LEED
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Thank you
Tachang@sfwater.org www.sfwater.org/np www.watereuse.org/educate/national-blue-ribbon-commission-for-onsite-non-potable-water-systems
Click on the Q&A button located on the black menu bar either on the top of bottom of your computer screen. Type in any questions you might have.
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San Francisco Public Utility Commission Recommended Resources
AIA & AIA California Resources
Case Study
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