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Petrochemical industry wastewater is contaminated with nitrogen and phosphorous compounds, mainly ammonium and ammonium nitrogen, and therefore needs treatment before it is released in the watercourse. Usually, petrochemical wastewater treatment is carried out following the ion exchange principle. One of the possibilities of petrochemical wastewater pre-treatment is using bentonite clays. Bentonite decreases the concentration of ions in the incoming wastewater and, as a consequence, the ion exchanger placed subsequently works more efficiently. The experiment was carried out with alkali-activated granulated bentonite and acid-activated granulated bentonite. In this work, bentonite particle size, the quantity and the type of bentonite, as well as the time of the contact of bentonite and wastewater, were optimized. It was found that the highest percentage of ion removal of 83 % for ammonia ions and 71 % for phospahate ions was accomplished when model solution was treated with the mixture of acid- and alkali-activated bentonite for 5 minutes.

Application of Clay for Petrochemical Wastewater Pretreatment