Unlocking Offshore Wastewater’s Potential: Lithium Extraction and Environmental Solutions

How can offshore wastewater be transformed into a critical energy transition resource?
The utilization of subsurface reservoirs for oil extraction, with subsequent utilization in CO2 sequestration and potential hydrogen storage, leads to the generation of significant quantities of produced water (PW) – 30 billion m3/year from Danish offshore production alone. Often exceeding oil extraction volumes, this PW is the primary waste from oil production, often discharged into the water column from most offshore platforms. Our research has delved into this issue and has successfully demonstrated the feasibility of extracting lithium from produced water. This discovery offers a twofold solution: it provides an avenue for re-injecting produced water, thereby reducing discharged PW while simultaneously reducing the discharge of metals into the sea. The simplicity of lithium carbonate extraction, even on offshore platforms, underscores its practicality. This achievement holds global significance, addressing critical raw material (CRMs) demands and aligning Danish offshore production with the European Union’s carbon neutrality goals. Our findings present an eco-friendly approach to resource management that contributes to a greener future while setting a model for responsible industry practices.