Marana d.o.o., founded in 1997 and based in Klis, Croatia, specializes in the fabrication of marine equipment and subsea components. Operating in the mechanical sector, the company frequently uses solvents and chemical agents in its production processes—especially for metal cleaning, painting, and surface treatments. This leads to the generation of hazardous waste streams, including spent solvents and contaminated cleaning agents. To reduce environmental risks and improve regulatory compliance, Marana implemented a closed-loop solvent recycling and hazardous waste management system. Marana installed an on-site solvent recovery system using thermal distillation technology. This system allows the company to reclaim used solvents—such as paint thinners and degreasers—by separating them from contaminants through controlled heating: Solvent Recovery Process Contaminated solvents are collected from cleaning and coating operations. The waste solvent is heated in a distillation unit, where it evaporates and is then condensed back into reusable form. Impurities (paint sludge, residues) remain as still bottoms and are properly containerized for external disposal. Recovery rates typically reach 80–90%, drastically reducing the need for virgin solvent. Hazardous Waste Management Enhancements Improved segregation of chemical wastes. Proper labeling, storage, and handling procedures for unrecoverable hazardous materials. Coordination with licensed facilities for the safe disposal of non-recyclable residues. This solution transforms Marana’s chemical waste stream from a disposal burden into a regenerative input.