Which wastewater treatment method would be appropriate for removing organic contaminants?

The appropriate wastewater treatment method for removing organic contaminants is reverse osmosis. This process involves forcing water through a semipermeable membrane that allows only water molecules to pass while rejecting a wide range of contaminants, including organic substances. This makes reverse osmosis a highly effective method for treating wastewater that contains dissolved and suspended organic materials.

In contrast to reverse osmosis, other methods listed, such as centrifugation and sedimentation, are primarily physical processes that rely on the density differences of particles. Centrifugation uses centrifugal force to separate solids from liquids but may not effectively remove dissolved organic pollutants. Sedimentation allows heavier solids to settle to the bottom of a tank but does not target dissolved organic matter.

Ion exchange is a method that can remove specific ions and certain charged contaminants from wastewater but is less effective in targeting a broad range of organic compounds, as it is more suited for the removal of ionic substances rather than organic molecules.

Therefore, reverse osmosis stands out as the most suitable choice for effectively removing organic contaminants from wastewater by ensuring a thorough purification process through its advanced filtration capabilities.