The purpose of this technical seminar was to evaluate the present state of the art in matter of advanced separation techniques like solvent extraction, ion-exchange, chemical precipitation, membrane and electrical processes for the treatment of radioactive liquid waste and a selection of some specific industrial non-radioactive effluents. Through this initiative, the organisers aimed at promoting the exchange of information between scientists from various origins (universities, research centres and industries) while contributing to the necessary overcoming of the artificial barriers which too often limit the "technology transfer" between the nuclear and non-nuclear sectors. Vll CONTENTS PREFACE ........................................ V ABBREVIATIONS ...................................... xiv OPENING SESSION WELCOME ADDRESS C. MANCINI (ENEA) .................................... 3 OPENING ADDRESS S. FINZI (CEC) ....................................... 7 AREAS WHERE ADVANCED SEPARATION TECHNIQUES ARE DESIRABLE G. GROSSI (ENEA), L. CECILLE (CEC) ....................... 11 REVIEW OF NEW EXTRACT ANTS POTENTIALLY APPLICABLE TO THE PROCESSING OF RADIOACTIVE LIQUID WASTES (Summary) P.R. DANESI, International Atomic Energy Agency, Vienna, Austria . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 . . . . . . . . . .

Opening Session.- Welcome Address.- Opening Address.- Areas Where Advanced Separation Techniques are Desirable.- Review of New Extractants Potentially Applicable to the Processing of Radioactive Liquid Wastes (Summary).- The Truex Process: A Vital Tool for Disposal of U.S. Defense Nuclear Waste.- Session I Amines/Amides Based Extractants.- Highly Selective and Micellar Extraction of Uranyl and Alkaline-Earth Cations (Summary).- Extraction of Metal Ions by Neutral ?-Diphosphoramides.- Treatment of Nuclear Waste Solutions Using A New Class of Extractants: Pentaalkyl Propane Diamides.- Research for Actinides Extractants from Various Wastes.- N,N Dialkylaliphatic Amides as Extractant of Platinum Group Metals.- Session II Bidentate Organophosphorus Extractants.- Application of the Teseo Process for Actinide Removal from Liquid Alpha Wastes Generated During UO2-PuO2 Fuel Fabrication Campaigns.- Separation of AM, EU and CE from Liquid Wastes with CMPO by Extraction Chromatography.- The Extraction of Actinides and Other Constituents from Highly Active Waste (HAW) by Trialkyl Phosphine Oxide (TRPO).- Actinides Removal by Means of Octyl(Phenyl)-N,N-Diisobutyl Carbamoyl Methyl Phosphine Oxide (CMPO) Sorbed on Silica.- Application of the CMPO Extractant (Supported Liquid Membrane) for the Alpha Decontamination of Marcoule Reprocessing Concentrate.- Comparison Between CMPO and DHDECMP for Alpha Decontamination of Radioactive Liquid Waste.- Application of CMPO Containing Gels to Metal Extraction.- Session III The Calixarenes.- Potential Industrial Applications of Calixarenes.- Special Calixarenes, Synthesis and Properties.- Calixspherands as Ligands for the Complexation of Radioactive Rubidium-81.- Research Activities on Calixarenes (Summary).- Session IV The Crown-Ethers.- GeneralProperties of Crown-Ethers and Their Potential for Applications in Analytical and Preparative Chemistry.- Possible Applications of Crown-Ethers to Metal Extraction Using Liquid Membrane Technology a Literature Survey.- Application of Crown-Ethers to Caesium and Strontium Removal from Marcoule Reprocessing Concentrate.- Session V Other Types of Extractants.- Synthesis of Macrocyclic Ligands and Their Application in the Separation of Rare Earths.- Separation of Actinides with Alkylpyridinium Nitrates.- Phosphonomethyl Substituted Phenols A New Class of Absorbers and Extractants for Metals.- Actinide Separations by High Pressure Cation Exchange - The Neptunium Case.- Separation of Metal Ions by Complexation-Ultrafiltration.- Session VI Inorganic Ion Exchangers/Absorbers.- Preparation and Properties of Hexacyanoferrates for the Removal of Caesium from Radioactive Waste Streams: A Review.- The Combination of Finely Divided Inorganic Ion Exchangers and Ultrafiltration for the Treatment of Low- and Medium-Level Waste.- Use of Hydrated Antimony Pentoxide (HAP) for Fission Product Removal from Irradiated U Solutions: Application to A Homogeneous Reactor Fuel Reprocessing.- Caesium Decontamination from MTR Waste Solution.- Selective ion Exchange for Chromium Recovery from Tannery Wastes.- Novel Organic, Inorganic and Modified Inorganic Materials for Waste Treatment.- The Eix Process for Radioactive Waste Treatment.- Conclusions.- Main Achievements of the Seminar.- List of Participants.- Index of Authors.