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References 1. Thomas, D.N., Judd, S.J. & Fawcett, N. (1999). Flocculation modelling: a review. Water Res. 33(7), 1579-1592. DOI: 10.1016/S0043-1354(98)00392-3. 2. von Smoluchowski, M. (1917). Versuch einer mathematischen theorie der koagulations - kinetics kolloid lösungen. Z.Phys. Chem. 92, 129-168. 3. Šulc, R. & Ditl, P. (2008). The effect of fl occulent dosage onto fl occulation kinetics. Czasopismo Techniczne - Seria: MECHANIKA 105(2), 341-349. 4. Šulc, R. (2003). Flocculation in a turbulent stirred vessel. Ph.D. Thesis, Czech Technical University in

Special Issue: NANOCELLULOSE Nordic Pulp & Paper Research Journal Vol 29 no (1) 2014 119 Flocculation and retention of fillers with nanocelluloses Markus H.J. Korhonen, Janne Laine KEYWORDS: Nanofibrillar cellulose, Flocculation, Charge density, Filler, retention SUMMARY: The objective of this study was to examine the effect of different cellulose nanofibrils (CNF) on the flocculation and retention of precipitated calcium carbonate (PCC) and kaolin. Of particular interest was the study of how charge modifications of CNF affect its flocculation and

Flocculation, dispersion and dynamic scenarios for formation C. T. J. Dodson and L. Serafino, Pulp & Paper Centre, University of Toronto, Toronto, Canada Keywords: Flocculation, Dispersion, Formation, Formation number, Simulation. SUMMARY: The standard reference structure for paper is a random network of arbitrary rectangular fibres, for which all aspects of the mass distribution can be derived analytically. It is known that, at the scale of one millimetre, the coefficient of variation of the local area1 density of typical commercial papers is about

255 J. Adv. Oxid. Technol. Vol. 12, No. 2, 2009 ISSN 1203-8407 © 2009 Science & Technology Network, Inc. Integrated Strategy for Treatment of Winery Wastewaters Using Flocculation, Ozonation and Fenton’s Oxidation Rui C. Martins, Fernando J.R. Abegão, Adrián M.T. Silva, and Rosa M. Quinta-Ferreira* GERSE – Group on Environmental, Reaction and Separation Engineering, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, Pólo II – Pinhal de Marrocos, 3030-790 Coimbra, Portugal Abstract: The present research is based on a

PAPER PHYSICS The effects of process variab les for GCC pre-floccu lation on floc and handsheet properties Dong i l Seo, Wan Hee lm, Hye Jung Youn and Hak Lae Lee KEYWORDS: Filler, Ground calcium carbonate, Flocculation, Polyacrylamide, Papermaking process, Paper properties SUMMARY: Pre-flocculation is a technique that aggregates filler particles by means of polyelectrolytes . The size of the filler floes is a critical factor affecting the properties of the paper. Process variables including the concentration of the flocculants, the stirring speed

). Several researches have been conducted in order to increase filler content in paper without significantly sacrificing paper strength. One of the technologies which have been tried in a commercial scale is pre-flocculation of fillers. In the pre-flocculation technology, fillers are flocculated with chemical additives such as flocculants and retention aids before being added to pulp stock (Lee and Lee 2006 , Chauhan and Bhardwaj 2013 , 2015 , Won et al. 2017 ). This enables formation of larger flocs of fillers which are more easily retained in sheet and cause less

treatment, Performantica Press, Iasi, 2006. [19] C. Zaharia and M. Macoveanu: “Types of polyelectrolytes used as flocculation agents”, The Environment, Vol. 5(1), (1994), pp. 17–23. [20] C. Zaharia and M. Macoveanu: “Separation of some heavy metal ions from wastewaters using polyelectrolytes”, Scientific Annals of “Al.I.Cuza” University Iasi, series Chemistry, Vl. 8(1), (2000), pp. 199–206. [21] C. Zaharia and M. Surpateanu: “Study of flocculation with Prodefloc CRC 301 polyelectrolyte applied into a chemical wastewater treatment”, Ovidius University Annals of

Some aspects on the reversibility of flocculation of paper stocks Faitz Hedbo~-g, Royal Institute of Technology, Department for Papez Technology, Stockholm, Sweden and Tom Lindstrom, MO och Domsjo AB, Research and Development, Omskoldsvik, Sweden Key~1o1.d~: Dewatering, Flocculation, Retention, Reversibility. SUMMARY: The aim of this investigation was to compare cer- tain features of microparticulate dual retention aid systems with those of classical dual polyelectrolyte systems. In particular the flocculation behaviour of a papermaking stock after

Simple analysis of the electrostatic screening mechanism in flocculation Stznre Nordholm, Mikael Rasmusson and Staffan Wall, Department of Physical Chemistry, University of Goteborg and Chalmers University of Technology, Goteborg, Sweden Keywords: Flocculation, Amylopectin, Starch. Electrostatics. SUMMARY: Experimental evidence of the flocculation ampli- tudes of cationic amylopectin with an anionic colloidal silicic acid in NaC1-solution has provided strong evidence of the dom- inance of electrostatic screening of cationic amylopectin as the key

Dynamic flocculation studies on fibre fines and filler clay Bjorn Krogerus, KCL Paper Science Centre, Espoo, Finland Keywords: Flocculation, Fines, Clay, Polyacrylics, Retention aids. SUMMARY: The flocculation characteristics of filler clay and of fibre fines derived from mechanical pulp were determined using a dynamic flow injection method. Flocculation was moni- tored using two Photometric Dispersion Analysers (PDA 2000s) coupled in series with an intermediate floc disruption stage between. In this way the initial flocculation, the floc strength under