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BY-NC-ND 4.0 license Open Access Published by De Gruyter Open Access July 26, 2018

COD reduction of process wastewater with vacuum evaporation

  • Andras Jozsef Toth EMAIL logo , Eniko Haaz , Botond Szilagyi , Tibor Nagy , Ariella Janka Tarjani , Daniel Fozer , Anita Andre , Nora Valentinyi , Szabolcs Solti and Peter Mizsey


Washing detergents in process wastewaters from fine chemical industry produce high Chemical Oxygen Demand (COD), which poses a serious environmental problem. Method has to be found, which follows the principles of circular economy so that the treated water can be recycled or reused. Heat pump vacuum evaporator is evaluated in order to reduce the Chemical Oxygen Demand of process wastewater with washing detergent content from initial 7500 mg O2/L to a lower value below the effluent limit , which is 1000 mg O2/L. Yield and COD rejection are determined for the evaluation of selected treatment. Experiments are investigated with LED Italia R150-v3 pilot apparatus. Different evaporation pressures were applied during measurements. It The highest removal or reduction of in the Chemical Oxygen Demand was reached certainly using the lowest possible pressure, which is 40 mbar.


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Received: 2017-11-10
Accepted: 2017-12-05
Published Online: 2018-07-26

© 2018 Andras Jozsef Toth, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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