Improved methods of microbial control in water based applications in the microelectronics industry

Hobro, Donald; Phillis, Kody*; Jenkins, Brian
(Nalco, an Ecolab Company)

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The need for reliable biocontrol in microelectronics water systems is based on demands for greater energy efficiency (HVAC chiller systems), improved odor control (wastewater systems), stricter environmental compliance (air scrubbers), and more reliable production support focused on protecting process cooling water (PCW) systems. A number of solutions, with varying degrees of effectiveness and predictability, are available. Recently, a technology that has been available for some time, chlorine dioxide (ClO2), is garnering more attention. This paper will discuss many of the methods for industrial biocontrol, with a specific emphasis on chlorine dioxide. A review of the alternatives, the differences between on-site ClO2 generation and utilizing a pre-made, dilute solution will be included. Attention will also be given to the various methods of on-site generation and their respective benefits and disadvantages. We will also provide some examples of the use of an improved method of on-site ClO2 generation.

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