Treatment of Condensates of Gas Coke by Anionic Exchange Resins: Thiocyanate and Phenol Retention

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Abstract
In coke production plants one of the most important wastewaters generated comes from the condensates of the gas coke pipelines which contains important quantities of toxic components such as phenols or thiocyanates. These contaminants can be treated by ion exchange. In this work, thiocyanate and phenol has been retained on strong anionic resins: Lewatit MP500 and Lewatit M610. Equilibrium and kinetics were studied and equilibrium constants and diffusivity values determined using different models. Breakthrough curves from the load and elution steps were carried out in order to evaluate the ion exchange operation in fixed bed. In the elution step the contaminants could be concentrated four times permitting their treatment. The results allow the determinination of the feasibility of ion exchange operations to diminish the thiocyanate and phenol concentration producing a final wastewater that can be used as treatment in the biological depuration of plants without poisoning the active sludges.

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