The learner will become famialiar with evaluating alternative scale inghibitors including methods and the application of current modeling techniques.

• Compare alternate for efficacy, minimum effective dosage and cost performance
• Compare formulations for efficacy, minimum effective dosage and cost performance
• Develop Laboratory experimental designs
• Find and compare upper limits and failure points
• Model interferences
• Check for synergy and antagonism

Robert J. Ferguson

Chelsea Standish

Raw Material shortages demand the development and application of techniques for testing, mdeling, and comparing the appropriateness of alternate inhibitors. Techniques and evaluation must reveaal differences and limitations in upper limits and cost performance. Testing for sysnergy and antagonism of blends provides further optimzation of alternate formulations. This paper applies laboratory test methods and modeling techniques to provide a thorough evaluation, and optimization of alternate inhibitor appropriateness, interactions, and formulation optimization.

Rob Ferguson began modeling scale inhibitors, their interactions, limitations, and optimization in the early 1970's. He has been a major contributor to cooling water, oil field and revesre osmosis scale inhhibitor modeling and application technology for over forty years. Rob pioneered the computer modeling of scale formation and its cotnrol, with career accomplishments including the first online real time control system, the development of ultralow dosage technology for utility once through cooling, and the development of the French Creek approach to water chemistry modeling that has become an international industry standard. Rob is proud to be a Ray Beaum Water Treater of the Year honorree, and to have received the first ever AWT Innovation award for the technology discussed and applies in this paper. Rob cofounded French Creek Software in 1989.