What is the most efficient technique for eliminating trace amounts of organic pollutants (less than 200 mg/liter) from contaminated water?

Explanation

Among the methods listed, adsorption using activated carbon is the most effective for removing low concentrations of organic contaminants from water. Techniques like lagooning and biological oxidation ponds are less efficient at treating such small quantities, while chemical coagulation is generally used for removing suspended solids rather than dissolved organic matter.