Describe the application of ion exchange in treatment of petroleum refinery drainage water

Ion exchange is a valuable technique in the treatment of petroleum refinery drainage water, playing a crucial role in addressing environmental concerns associated with the discharge of contaminated water. Refinery processes generate wastewater containing various pollutants, including heavy metals, salts, and organic compounds. Ion exchange is employed ___ ________ ___ _________ ________ _____ _________.
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