Note: This pilot credit was closed for new registrations as of March 1, 2012.
The new options (Option 2 and Option 3) in this credit will potentially be added to the current Option 1, found in LEED 2009 for Neighborhood development. The credit has been revised to encourage more project teams to pursue the credit by finding ways to eliminate, reuse, or recover resources from wastewater.
Option 1 now includes a reference to NSF-350. The NSF-350 standard, Onsite Residential and Commercial Reuse Treatment Systems, “establishes minimum materials, design and construction, and performance requirements for onsite residential and commercial reuse treatment systems” including wastewater treatment systems. For more information visit the NSF website: http://www.nsf.org/business/wastewater_certification/standards.asp?program=WastewaterCer
Option 2 encourages project teams to consider alternative technologies.
Wastewater contains various organic matter, nutrients, and minerals that can be a source of energy or other reusable resource. For Option 3, project teams are encouraged to think about how the resources, nitrogen or organic carbon can be extracted from wastewater and reused.
For all options, estimate the annual wastewater based on the building occupancies, fixture and fixture fitting rates, typical daily use, and annual days of operation.
Identify the amount of annual wastewater reused and calculate the percent reduction from the total annual wastewater. Provide a narrative about the wastewater treatment/reuse system including whether it meets the NSF 350 or a local standard (whichever is more stringent).
Highlight the NSF 350 or local standard section to show the minimum requirements for the system installed. Provide any applicable specifications or drawings to demonstrate the system design and location.
Provide a narrative which includes the type of alternative technology and details about how it will be installed and operated for the project buildings. Systems that negatively offset the environmental benefits, such as those that have high energy use or high pollution rates, will not be accepted.
Provide any applicable specifications, drawings, and calculations to show that the system significantly minimizes or eliminates the annual wastewater produced from sewage conveyance.
Process waterProcess water is used for industrial processes and building systems such as cooling towers, boilers, and chillers. It can also refer to water used in operational processes, such as dishwashing, clothes washing, and ice making. reduction (i.e., from food service) may qualify for this credit, however, and additional explanation of the method must be provided.
Estimate the amount of nitrogen or organic carbon available based on the total annual wastewater, and then demonstrate how at least 25% of the available resource is being used through calculations.
Provide a narrative explaining how the strategy is a beneficial use of the recovered resource. Provide any applicable specifications or drawings to show the system design and location.
Excerpted from LEED 2009 for New Construction and Major Renovations
To increase the efficiency of wastewater reuse by encouraging water reuse, reduction or recovery.
Option 1: Reuse
Retain on site at least 25% or 50% of the average annual wastewater generated by the project (including residential buildings 3 stories or fewer that are new or undergoing major renovations, and excluding any existing buildings), and reuse that wastewater to replace potable waterPotable water meets or exceeds EPA's drinking water quality standards and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems.. Provide on-site treatment to the applicable NSF 350 standard or a quality required by state and local regulations for the proposed reuse, whichever is more stringent. The percentage of wastewater diverted and reused is calculated by determining the total wastewater flow using the design case from GIB Prerequisite, Minimum Building Water Use, and determining how much of that volume is reused on site.
Table 1. Points for reusing wastewater
Option 2: Source Reduction
Reduce wastewater from toilets and urinals by at least 50% from the baseline calculated in WE Prerequisite Minimum Building Water Efficiency (including residential buildings 3 stories or fewer) for toilets and urinals only.
Option 3: Nutrient Recovery
Implement resource recovery and reuse of one or both of the following for up to 2 points.
The homepage for the LEED Pilot Credit Library. The LEED Pilot Credit Library is intended to facilitate the introduction of new prerequisites and credits to LEED. This process will allow USGBC to test and refine credits through LEED 2009 project evaluations before they are sent through the balloting process for introduction into LEED.
Background for the LEED Pilot Credit Library is provided in this foundational document.
If we were to certify a campus EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. project and we pursued this credit for a campus wastewater treatment facility would this PC gain a point for each building that used the wastewater treatment center?
Prudence, this is a good question. EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. campus projects are not eligible to use the LEED ND version of this credit. I'd recommend using the Guidance for Multiple Buildings and On-Campus Projects http://www.usgbc.org/DisplayPage.aspx?CMSPageID=2326 as a starting point. Also, while the Sustainable Wastewater Management strategy is not slated for inclusion in LEED EBOM for 2012, it is available for EBOM pilot testing under Pilot Credit 10 http://www.leeduser.com/credit/Pilot-Credits/PC10. If you do register for PC10, we'd be interested to know how the credit did or did not work for a campus setting and for a project with existing infrastructure.
Details on what the LEED pilot credit library is and how to use it.
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