1. TREATED DIATOMITE FOR TOLUIDINE BLUE REMOVAL FROM WASTEWATER. IS IT WORTH IT?. Authors: HOREA BEDELEAN, RALUCA PLEȘA CHICINAȘ, ANDRADA S. MĂICĂNEANU.2. Na+ - NH4+ CATION EXCHANGE STUDY ON TREATED ZEOLITIC VOLCANIC TUFF IN FIXED BED COLUMN. Authors: HOREA BEDELEAN, ANDRADA S. MĂICĂNEANU.