Federal Net Zero Design-Energy, Water, and Waste. Net Zero Water. Kate McMordie Stoughton Pacific Northwest National Laboratory August 16, 2017

Transcription

1 Federal Net Zero Design-Energy, Water, and Waste Net Zero Water Kate McMordie Stoughton Pacific Northwest National Laboratory August 16, 2017 Tampa Convention Center Tampa, Florida

2 Session Objectives By the end of the session, I hope that you: Understand what Net Zero Water means Know how to measure Net Zero Water Have tips for designing a Net Zero Water building 2

3 What is Net Zero Water? A net zero water building is operated to: Minimize water consumption Minimize wastewater discharge Maximize alternative water use Return water to the original water source A Net Zero Water building s alternative water use plus water returned to the original source is equal to the total water consumption over the course of a year. 3

4 Two Key Questions Can alternative water be used at the building? Can water be returned to the original water source? 4

5 Can alternative water be used at the building? Alternative water sources are sustainable sources not derived from fresh surface or groundwater sources. Rainwater Harvesting Gray Water Condensate Capture Rainwater Harvesting System Process Discharge Wastewater Reclaim 5

6 Can water be returned to the original water source? Is the building located in the 12 digit hydrologic unit code (HUC) watershed of the original water source that supplies water to the building? Find the HUC 12 Watersheds here: US Geological Survey Watershed Boundary Maps: Example Watershed Boundaries: 6

7 Measuring Net Zero Water Quantify the building s water uses: Potable water use Non-potable water use Quantify alternative water uses Quantify water returned to the original water source Treated wastewater Stormwater infiltrated through green infrastructure 7

8 Net Zero Water Building Example: The Ideal Building 60 Thousand of gallons per year Treated Wastewater Graywater Harvested Rainwater Non-Potable Water Potable Water 0 Alternative Water Used Total Water Used 8

9 Net Zero Water Building Example: The Mainstream Building 60 Thousand of gallons per year Green Infrastructure Graywater Harvested Rainwater Non-Potable Water Potable Water 0 Alternative Water Used and Water Returned Total Water Used 9

10 Design Elements of a Net Zero Water Building Reduce Water Demand 1 Produce Alternative Water 2 Treat Wastewater Onsite 3 Design Green Infrastructure 4 10

11 Reduce Water Demand Plumbing Irrigation Kitchen Cooling & Heating High efficiency fixtures WaterSense fixtures Dual plumbing system Water-smart landscaping Waterefficient irrigation system Waterefficient equipment ENERGY STAR equipment Passive systems Waterefficient systems FEMP Resources: Water Efficiency Best Management Practices: Water-Efficient Technology Opportunities: 11

12 Produce Alternative Water Rainwater Harvesting Potential FEMP Resource Alternative Water Maps and Tools: native-water-sources-maps Condensate Capture Potential 12

13 Treat Wastewater Onsite Pond System Intermittent Sand Filter Constructed Wetland Membrane Bioreactor Constructed Wetland Example: Living Machine at Marine Corps Base San Diego FEMP Resource Technology Review of Onsite Wastewater Treatment Options: 13

14 Design Green Infrastructure Bioswale Rain Garden Green Roof Bioswale Permeable Pavement EPA Resource Green Infrastructure: 14 Permeable Pavement

15 Thank you! Kate McMordie Stoughton Pacific Northwest National Laboratory

16 Important Terms Potable Water Water that is safe for human consumption. Freshwater A surface or groundwater source that has a total dissolved solids concentration of less than 1,000 milligrams per liter (1,000 ppm). Alternative Water A sustainable water source not derived from fresh, surface or groundwater sources. (Sources include harvested rainwater, harvested stormwater, sump pump water harvesting, graywater, air cooling condensate, reject water from water purification systems, reclaimed wastewater, or water derived from other water reuse strategies.) Original Water Source Freshwater source that supplies water to the building. A net zero water building returns water to the original water source, which is considered the 12 digit hydrologic unit code watershed by the U.S. Geological Survey. Green Infrastructure Design features that retain stormwater on-site and return it to groundwater. 16