WB03 - Implementing a Risk-based Approach for Non-potable On-site Water Reuse

Tuesday, November 13 from 10:15 AM to 11:15 AM | 185D « Back

Abstract Text:

The reuse of alternative water sources (e.g., graywater, stormwater, roof runoff ) within single buildings or urban districts for nonpotable purposes such as toilet flushing or landscape irrigation is gaining popularity across the country. A group of public utilities and health agencies seeking uniform guidance on treatment requirements and monitoring approaches has recently released a Guidebook for Developing and Implementing Regulations for Onsite Non-potable Water Systems. This session provides the technical basis to understand the risk based approach emphasized within this guidance document. Specifically, both the rationale and nature of quantitative microbial risks assessment (QMRA) models used to generate treatment targets will be presented, as well as how the targets are used to develop and permit treatment systems. Best approaches for effective monitoring of the systems to ensure safe operation will be discussed, emphasizing the linkage of the most recent advancements in microbiology with simple, on-line sensors. Finally, the relative cost-benefits of different approaches to reuse including a comparison of different treatment technologies, types of alternative “source” waters, and scales of implementation will be presented to aid building designers as they consider incorporating nonpotable reuse systems into building plans.

Learning Objectives:

Explain the rationale and approach for defining a risk based approach for water reuse systems, including different types of onsite water reuse .

Define the importance of microbial pathogens and indicators in defining and measuring performance of onsite water reuse systems.

List different approaches for monitoring the performance of on site water reuse systems.

List different economic and environmental impacts of implementing on-site water reuse systems.

Learning Level:



GBCI Credit Hours:
AIA Credit Hours:

Event Type: WaterBuild Summit > Session