REFERENCES
- Kallo , D. and Sherry , H. , eds. 1988 . Occurrence, Properties and Utilization of Natural Zeolites Budapest : Akademiai Kiado .
- Ouki , S. , Christopher , R. and Roger , R. 1994 . Natural Zeolite Utilization in Pollution Control: A Review of Applications to Metal Effluents . J. Chem. Tech. Biotechnol. , 59 : 121 – 126 .
- Carland , R. and Aplan , F. 1995 . Use of Natural Sedimentary Zeolites for Metal Ion Recovery from Hydrometallurgical Solutions and for Environmental Remediation . Proceedings of XIX International Mineral Processing Congress , 4 : 95 – 100 .
- Ouki , S. and Kavannagh , M. 1997 . Performance of Natural Zeolites for the Treatment of Mixed Metal-Contaminated Effluents . Waste Manage. Res. , 15 : 383 – 394 .
- Walter , J. , Weber , J. , McGinley , M. and Linn , E. 1991 . Sorption Phenomena in Subsurface Systems: Concepts, Models and Effects on Contaminants Fate and Transport . Wat. Res. , 25 : 449 – 528 .
- Bereket , G. , Aroguz , A. and Özel , M. 1997 . Removal of Pb(II), Cu(II) and Zn(II) from Aqueous Solutions by Adsorption on Bentonite . J. Colloid. Appl. Sci. , 187 : 338 – 343 .
- Periasamy , K. and Namasivayam , C. 1996 . Removal of Cu(II) by Adsorption on Peanut Hull Carbon from Water and Copper Plating Industrial Water . Chemoshere , 32 : 769 – 789 .
- Emanuel , N. and Knorre , D. 1984 . Course on Chemical Kinetics Moscow : Visshaja Shkola .
- Ministry of the Environment and Water , Ministry of the Regional Development and Public Works and Ministry of Health; Ministry of Economics . 2000 . Regulation No. 6 for Emission Standards for Allowable Content of Harmful and Hazardous Substances in Wastewater Discharged in Surface Water Basins Bulgaria : State Newspaper . 97/9.11.2000
- Cotton , F.A. and Wilkinson , G. 1972 . Advanced Inorganic Chemistry, , 3rd Ed. New York, London : Interscience Publishers .
- Leonov , S. and Martynova , T. 1994 . Significance of Ion Exchange in Purification of Water by Natural Zeolites . Izv. Vyssh. Uchebn. Zaved. Tsvetn. Metall. , 3 : 3 – 8 .