The Water Research Foundation (WRF) is soliciting proposals under RFP 5371, titled "Optimizing Densified Systems for Nutrient Removal, Energy Savings, and Reliable Performance." As part of its Research Priority Program, WRF aims to expand the applicability of densification strategies to diverse wastewater treatment plant configurations, especially those without anaerobic selectors. The project’s objective is to refine design parameters—such as F/M ratios, C/N ratios, and solids retention times—while developing implementation guidance in the form of a "recipe book" to support utilities in adopting these practices.
Densification has been recognized as a method to increase wastewater treatment capacity, improve nutrient removal, and enhance sludge settleability without requiring extensive infrastructure expansion. Previous studies, particularly Regmi et al. 2024, highlighted the potential of biological and physical selection techniques to achieve granular sludge formation. Building on those findings, this RFP focuses on applying such strategies in systems like Modified Ludzack Ettinger and four-stage Bardenpho, where anaerobic selectors are absent.
The research must include a literature review, experimental analysis, and performance evaluations using metrics like sludge volume index, mixed liquor suspended solids, and energy usage. It may explore additional areas such as microbial community shifts, downstream process impacts, and seasonal variability. Deliverables include a comprehensive final report, peer-reviewed article, and practical tools like decision frameworks or fact sheets.
The total budget available is $300,000, and proposers must contribute a minimum of 33% in cost share or in-kind contributions. The project duration is expected to be 36 months. Proposals are due by 3:00 PM Mountain Time on November 20, 2025, and must be submitted through the WRF online portal.
Eligibility is broad and includes U.S. and non-U.S.-based research institutions, government entities, and private firms. Proposals must follow WRF’s submission guidelines and demonstrate the team’s qualifications, technical merit, and capacity to deliver high-impact results. Evaluation criteria include understanding of the problem, scientific merit, project management, communications plan, and adherence to the budget and schedule.
For questions regarding the RFP or project requirements, applicants should contact Dr. Maitreyi Nagarkar at mnagarkar@waterrf.org or 571.384.2117. Inquiries about the online submission system should be directed to Caroline Bruck at cbruck@waterrf.org or 303.347.6118. Proposers are encouraged to consult WRF’s guidelines and referenced research to ensure their proposal aligns with strategic research goals.
Align proposal with evaluation criteria: technical merit, management capacity, and communication plan. Include detailed deliverables and demonstrate knowledge of densification processes.
