Final answer:
The removal of air, water, solid particles, and chlorinated solvents from hydraulic fluids is performed through aeration, filtration (using materials like sand, gravel, charcoal and possibly HEPA filters), sedimentation, and other advanced treatments as necessary.
Step-by-step explanation:
The process of removing air, water, solid particles, and chlorinated solvents from hydraulic fluids involves several steps, including aeration, filtration, sedimentation, and possibly other treatments depending on the specific contaminants.
Aeration is a technique that brings air into contact with hydraulic fluids to facilitate the exchange of gases and the removal of volatile organic substances like benzene and toluene. This step also helps in oxygenation.
Filtration is employed to remove small particles from the fluid. This can be achieved by passing the fluid through materials with varying pore sizes, like sand, gravel, and charcoal. HEPA filters may also be used to capture smaller particles and microbes.
Furthermore, sedimentation allows heavier particles, often referred to as floc, to settle at the bottom, after which the cleaner fluid can be processed further. In some advanced treatments, techniques like sonication might be used to remove more complex contaminants.