Evaluating Thin Film Nanocomposite Membranes to Treat Brackish Waters through Reverse Osmosis | Apply Online

Opportunity Summary:

This grant opportunity, titled "Evaluating Thin Film Nanocomposite Membranes to Treat Brackish Waters through Reverse Osmosis," is a Bureau of Reclamation (Lower Colorado Region) cooperative agreement focused on a specific technical gap in reverse osmosis (RO) membrane research: whether thin film polyamide membranes enhanced with zeolite nanoparticles (often described as mixed-matrix or nanocomposite membranes) can reliably treat real brackish waters for an extended period under realistic operating conditions. The core problem the project is trying to solve is that, while there are studies describing long-term performance of polyamide/zeolite RO membranes for seawater applications, there is essentially no published evidence showing how these materials hold up on brackish waters around 3000 ppm total dissolved solids, especially when exposed to the complications of real-world feedwater quality and continuous operation. Earlier work (noted as 2007) suggested a mixed-matrix membrane formulation could achieve brackish-water-type performance, but the opportunity emphasizes that even basic longer-term testing (beyond short runs such as 48 hours) has not been published for these membrane types in brackish applications. The project is therefore designed to move beyond short laboratory demonstrations and toward evidence of durability and performance stability over a representative timeframe, defined here as a minimum of three months.

The technical approach centers on fabricating and evaluating small membrane "swatches" (test coupons) that measure about 3 by 2 inches. A minimum of nine swatches will be produced from polyamide/zeolite nanocomposite membrane sheets. These swatches will be tested at the Yuma Area Office Water Quality Improvement Center (WQIC) using a bench-scale, nine-cell testing platform described as a "Swatch Unit." The intent is to generate performance data that is meaningful for potential scale-up, meaning the membranes are not only assessed for initial salt rejection and water flux, but also tracked for changes over time that could indicate fouling, compaction, degradation, or loss of selectivity. Importantly, the testing is not limited to idealized lab water. The project includes both controlled water and real-world water sources: controlled water is described as RO permeate from WQIC Pilot System 1, while real-world water is identified as pretreated agricultural drainage used as RO feed. That combination is meant to separate intrinsic membrane behavior from the more challenging effects introduced by complex feedwater matrices found in actual treatment settings.

Responsibilities are split between the recipient (identified in the description as Arizona State University, ASU) and Reclamation, which is why the award mechanism is a cooperative agreement rather than a typical grant with minimal federal involvement. On the recipient side, ASU is responsible for membrane casting, pre-test baseline evaluation, post-test forensic-style characterization, and the engineering analysis of performance during the long-duration run. The membrane casting task is planned as roughly a one-month activity to produce the required number of swatches from zeolite/polymer nanocomposite materials. Before the long-term field-style testing begins, ASU will conduct laboratory flux and rejection testing to establish baseline performance under conditions aligned with the expected WQIC operating conditions. ASU will also document the physical, chemical, and morphological properties of the as-cast membranes using a suite of surface and materials characterization methods: contact angle (to assess surface wettability and changes associated with surface chemistry), ATR-FTIR (to probe chemical functional groups and potential changes in the polyamide layer), AFM (to map surface roughness and nanoscale topography), SEM (to visualize surface and cross-sectional morphology and potential defect structures), and XPS (to quantify surface elemental composition and chemical states). After the three-month WQIC testing period, ASU will repeat the same characterization suite to identify how the membranes changed during operation, which helps tie performance trends (for example, flux decline or rejection drift) to physical or chemical mechanisms (for example, organic fouling layers, inorganic scaling signatures, or surface chemistry shifts).

During the three-month operating window at WQIC, ASU will also evaluate membrane performance using the data produced during the run, focusing on the core RO metrics of flux (how much water passes through the membrane per unit area and time) and rejection (how effectively salts and other dissolved constituents are removed). The timeline implied by the tasks is roughly six months end-to-end, with early months dedicated to casting and baseline characterization, a middle period devoted to long-term operation and data generation, and a final month devoted to post-test analysis and interpretation. This structure is meant to produce a complete "before, during, after" picture: what the membrane looked like and how it performed initially, what happened during extended exposure to controlled and real waters, and what physical evidence remains on or within the membrane after sustained use.

Reclamation's role is described as substantial and operationally essential. Reclamation will provide the infrastructure needed to run the membrane swatches under realistic conditions, including water, power, and the test skid itself (the nine-cell bench-scale Swatch Unit). Reclamation staff will also provide day-to-day operational, maintenance, and engineering support to keep the unit running, collect performance data, and troubleshoot any issues that arise during the multi-month testing campaign. In addition, Reclamation will perform typical RO laboratory analyses for the swatch feed and product (per membrane type) water streams, with sampling noted as two dates per run. This federal involvement is a key feature of the opportunity because it ensures the membranes are tested in a facility that can maintain consistent operations and generate credible, traceable performance and water-quality data.

Administratively, this opportunity was issued as a Notice of Intent to Award, meaning it was not seeking open competition and was targeted to a specific recipient rather than broadly soliciting proposals. It falls under CFDA 15.560 (SECURE Water Act Research Agreements) and is categorized under Natural Resources. The funding instrument type is a cooperative agreement, with an expected single award. The total funding is listed as $21,500, and the award floor and ceiling are both $21,500, indicating a fixed award amount. Cost sharing or matching is required, though the description does not specify the percentage or form within the provided text. The posting date is February 26, 2013, with a closing date of March 12, 2013, and an archive date of April 11, 2013. For access issues, the contact listed is Shawna Thompson, Grants Officer, with phone and email provided.

In practical terms, the deliverable value of the project is straightforward: credible evidence about whether polyamide/zeolite thin film nanocomposite RO membranes can maintain stable brackish-water performance for at least three months when exposed to both controlled and operationally relevant waters, supported by rigorous pre- and post-test materials characterization. If successful, the work would help move mixed-matrix nanocomposite RO membranes closer to scale-up decisions by providing the kind of durability and real-water validation that is often missing between promising lab results and deployable treatment technology.

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