Produced Water: A Potential Solution to Achieve America Energy Dominance

Produced water, a significant byproduct of oil and gas extraction, represents an underutilized water resource. However, the high salinity, presence of organics, and scale-forming compounds make it technically challenging to treat. Membrane desalination technologies suffer from fouling, while traditional thermal methods struggle with high salinity and organic contamination. Pretreatment steps increase treatment costs. To make produced water a viable clean water source, alternative technologies that can handle both organics and high salt concentrations are needed. Additionally, if the organic content can be utilized as an energy source, it could potentially make the water treatment process energy self-sufficient and cost-effective.

Near-Term Opportunity: Produced water could supplement water supplies in water-scarce regions if effectively treated. Promising technologies like supercritical water desalination and oxidation (SCWDO) and evaporator with catalytic oxidation (ECO) show potential for near net-zero energy consumption by utilizing the organic content as an energy source. These processes have been demonstrated to treat produced water with a wide range of salinities, producing high-purity distillate. Additionally, the SCWDO process offers opportunities for extracting valuable critical minerals from the concentrated brine. Integrating mineral extraction with the water treatment process could make the overall system more sustainable and cost-effective, strengthening the energy-water nexus.

Success Measures: There are various quantitative and qualitative assessments that could be deployed for addressing the success for produced water treatment. A few examples include: ability to bring the treated water quality within EPA drinking water standards, lowering treatment costs to economic feasibility, technology compatibility in handling different water qualities, potential of scale-up to deploy technology from pilot scale to industrial scale, and increasing social acceptance.