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Influence of Surfactants on the Performance of Calcium Phosphate Scale Inhibitors

  • Z. Amjad
Veröffentlicht/Copyright: 5. April 2013
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Abstract

The pH-stat technique was used to study the influence of various types of surfactants on the performance of polymers used as inhibitors for preventing the precipitation of calcium phosphate in industrial water systems. Four types of surfactants were evaluated: 1) anionic, 2) non-ionic, 3) amphoteric, and 4) cationic. The polymeric inhibitors studied include homo-, co-, and terpolymers containing different functional groups such as carboxylic acid, sulfonic acid, ester, and amide. It has been found that polymer dosage and polymer architecture play important roles in inhibiting calcium phosphate precipitation. The results on the evaluation of surfactants reveal that all surfactants are ineffective calcium phosphate inhibitors. Comparative inhibition data collected for various calcium phosphate inhibiting polymers in the presence surfactants containing different ionic charges are presented. Results are also discussed on the influence of cationic polymeric flocculant in preventing the precipitation of calcium phosphate by anionic polymeric inhibitors.

Kurzfassung

Die pH-stat-Technik wurde eingesetzt, um den Einfluss von unterschiedlichen Arten von Tensiden auf die Wirkung von Polymeren zu studieren, die als Inhibitoren für die Ablagerung von Kalziumphosphat in industriellen Wassersystemen genutzt werden. Vier Arten von Tensiden wurden untersucht: 1) anionische, 2) nicht-ionische, 3) amphotere und 4) kationische. Die untersuchten Polymerinhibitoren umfassen Homo-, Co- und Terpoymere mit verschiedenen funktionellen Gruppen wie Carboxylsäuren, Sulfonsäuren, Ester und Amide. Es wurde beobachtet, dass die Dosierung und die Struktur der Polymere eine wichtige Rolle bei der Vermeidung der Calciumphosphat-Ausfällung spielt. Es zeigt sich auch, dass alle Tenside nicht wirksame Kalziumphosphat-Inhibitoren sind. Es werden Ergebnisse präsentiert, die bei Zugabe von Tensiden mit unterschiedlichen ionischen Ladungen für verschiedene Polymere als Kalziumphosphat-Inhibitoren ermittelt wurden. Die Ergebnisse werden auch diskutiert, ob kationische polymere Flockungsmittel die Ausfällung von Calciumphosphat in Gegenwart von anionischen Polymerinhibitoren beeinflussen können.


Dr. Zahid Amjad, Department of Mathematics and Sciences, Walsh University, 2020 E. Maple Street, North Canton, Ohio 44720. E-Mail:

Zahid Amjad, Ph.D., has over 30 years experience in the water treatment, membrane processes, household, personal care, and pharmaceutical fields. He has published over 150 technical papers and is holder of 30 US patents. Dr. Amjad has edited six books and has presented papers at national and international conferences. Dr. Amjad is a member of several professional societies and is a recipient of Association of Water Technologies 2002 Ray Baum Memorial Water Technologist of the year award. His current research interests include development and applications of water soluble polymers, inhibition of mineral scale formation, and water purification. Dr. Amjad is the founder and president of Aqua Science and Technology LLC. He currently provides technical and marketing consultation to water treatment, separation processes, and related fields. Dr. Amjad is also a Visiting Professor in Chemistry at Walsh University, North Canton, Ohio. He may be contacted at


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Received: 2010-07-30
Published Online: 2013-04-05
Published in Print: 2011-01-01

© 2011, Carl Hanser Publisher, Munich

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