A new method of regeneration of anion exchangers used for recovering chromates from wastewater |
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| Authors: | Lucian Pawlowski Barbara Klepacka Roman Zalewski |
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| Affiliation: | 1. Department of Chemical Technology, Institute of Chemistry, Maria-Curie Sklodowska University, 20-031 Lublin, Poland;2. Department of Numerical Methods, Institute of Mathematics, Maria-Curie Sklodowska University, 20-031 Lublin, Poland |
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| Abstract: | A new economically attractive method of recovery of water and chromates from wastewater has been presented. In order to obtain a high enough concentrated regeneration effluent for refilling plating bath, high concentrated sodium hydroxide (45%) was used for regeneration of a weakly based anion exchanger bed (Wofatit AD 41). Further increase of the concentration of the regeneration effluent was obtained by recycling certain frontal and tail parts of regeneration effluent to raw wastewater. It permits to recycle only a high concentrated part of the regeneration effluent to refilling the plating bath.The influence of flow rates, doses of sodium hydroxide and recirculation ratio on the average concentration of the regeneration effluent and ion exchange capacity has been presented. |
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