Nature-Based Approaches for Concentrate and Salinity Management

The Water Research Foundation (WRF), a private nonprofit organization dedicated to advancing the science of water, is soliciting proposals under RFP 5366 titled "Nature-Based Approaches for Concentrate and Salinity Management." This funding opportunity seeks to support innovative research addressing the management of reverse osmosis (RO) concentrate, a byproduct of water purification processes. RO concentrate often contains pollutants at significantly elevated levels, presenting a substantial barrier to implementing water reuse in regions with limited discharge options. Natural treatment systems, particularly constructed wetlands, are emerging as viable alternatives due to their ability to remove various contaminants while also offering environmental co-benefits. The primary objective of this project is to collect or compile field data and optimize the engineering design of constructed wetlands for effective RO concentrate treatment. The research will focus on quantifying pollutant removal efficiency, comparing treatment effectiveness with that of treated wastewater, and identifying optimal media compositions. Additionally, it will investigate evapotranspiration rates in treatment wetlands versus evaporation ponds, potentially supporting non-discharging solutions in water reuse projects. WRF encourages proposals that include comprehensive literature reviews and/or field experiments to provide actionable design guidance. Applicants may tailor their approach to specific contaminants or regional discharge requirements. Deliverables must include a detailed literature review, final research report formatted per WRF’s guidelines, and potentially a workshop or guidance manual. Proposers are also invited to suggest innovative deliverables beyond the core requirements. Funding up to $250,000 is available, with a required cost share of at least 33% of the requested amount. Eligible applicants include both U.S.-based and international entities such as research organizations, academic institutions, governmental bodies, consultants, and other for-profit organizations. Proposals are due by 3:00 PM Mountain Time on Thursday, November 20, 2025. Submissions are accepted exclusively online via the WRF proposal portal. The expected project duration is 18 to 36 months, and WRF enforces strict timeliness policies. Proposals will be evaluated based on five criteria: understanding of the problem, technical merit, qualifications, communication plan and deliverables, and budget/schedule. The point of contact for project-related questions is Alice Jariz, PE, reachable at ajariz@waterrf.org or 303.347.6111. For technical support with submissions, contact Caroline Bruck at cbruck@waterrf.org or 303.347.6118. This funding opportunity does not recur on a set schedule.

Ensure adherence to WRF's research and administrative standards, including budget preparation and indirect cost documentation. Timeliness is a key evaluation factor.