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NSF 401 – Emerging Compounds/Incidental Contaminants - Update

NSF 401 – Emerging Compounds/Incidental Contaminants - Update. May 14, 2014 Stephen VerStrat. NSF 401. Focus on Emerging and/or Incidental Drinking Water Contaminants Encompasses Active Media and RO Technologies Harmonized with DWTU Standards for Material Safety, Structural Integrity…

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NSF 401 – Emerging Compounds/Incidental Contaminants - Update

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  1. NSF 401 – Emerging Compounds/Incidental Contaminants - Update May 14, 2014 Stephen VerStrat

  2. NSF 401 • Focus on Emerging and/or Incidental Drinking Water Contaminants • Encompasses Active Media and RO Technologies • Harmonized with DWTU Standards for Material Safety, Structural Integrity… • Performance Testing/Product Exposure Consistent with NSF/ANSI Standards 53 and 58

  3. NSF 401 Contaminants

  4. NSF 401 Ballot • Formal Balloting of the Standard Occurred Late 2013 • Results • Affirmative: 26 • Negative: 0 • Abstain: 2 • Not Returned: 1

  5. Comments • Six Comments Associated With Affirmative Votes • 3 Contingent on Successful Validation • 3 Relative to Material Safety (out of scope)

  6. Validation • Task Group Has Opted to Form a Sub-Task Group to Coordinate the Validation of the Standard • Validation to Cover Active Media and RO Technologies • Key Considerations • Quantifiable Limits, Reliability, Repeatability • Meeting Target Influent Challenge Levels • Stability of Challenge Water

  7. Validation (cont) • Challenges • Participation • 4 organizations to date • Suitable Laboratories • Difficulty identifying laboratories with existing methodologies to analyze to the target levels • Costs • Method Development • Analysis

  8. Validation (cont) • NSF Has Conducted a Number of Validation Tests Internally and Is Comfortable with the Ability to Produce a Stable Challenge Water Meeting the Parameters of the 401 Standard. • For Active Media, Additional Validation Efforts Relative to the Unit Exposure and Product Water Collection Is Not Deemed Necessary Since this Has Been Established in Existing Standards.

  9. Validation - Stability Mixture A was analyzed at 0, 1, 4, and 5 days Mixture B and C were analyzed at 0, 1, 2, 4, and 7 days

  10. Validation - Influents

  11. Validation - Effluents

  12. Validation (cont) • RO Validation • Questions: • Performance Based Upon Rejection by Membrane?, or Is There an Adsorption Phenomenon in Play? • Is the Current 7 Day Std 58 Protocol Adequate to Assess Performance Under 401? • What Modifications or Approach Should Be Taken to the Validation of RO Technologies.

  13. Validation (cont) • Regu Regunathan Has Agreed to Chair the Sub-task Group and Draft a Proposal for Validating RO Performance Under This Standard. • Once a Proposal is Agreed Upon It Is Anticipated that Round Robin Work Will Be Initiated As a Validation Step. • Sub-task Group is Seeking Additional Participation from RO Manufacturers.

  14. For Discussion….. • Pursue the validation of RO technology to resolve potential adsorption issues during the test period. • Separate RO from current ballot and update proposed Standard to reflect all recent balloted and approved DWTU Standard updates. • Provide Active Media validation data with ballot of active media only proposal. • Submit RO validation and standard language with a standard revision ballot when validation is complete.

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