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• Carbonaceous cation and anion exchangers in water treatment
• Activated carbon from coal refuse for water purification
• Carbonaceous cation exchangers from coal and coal refuse
• Fly ash as a coagulant aid in water treatment
• The Use of coal and modified coals as adsorbents for removing organic contaminants from waste waters
• Selenium removal from acidic waste water using zinc reduction and lime neutralization
• Molybdenum removal from concentrator waste water