Membranes: TOC reduction using membrane technology

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Honeywell’s Solid State Electronics Centre (SSEC) in Plymouth, Minn., had been trying to reduce the level of total organic carbon (100) in its high-purity deionized water system for many years. They had always experienced periods of relatively low 100 (less than 10 parts-perbillion [ppb]) but always had periods of high 100 (greater than 50 ppb). These high periods had usually been short periods of time and they could not directly correlate the 100 to any contamination on the product. Their water source was from a well via the Plymouth municipal water supply.

 

In April l997 everything changed. For the first time, SSEC had a 100 excursion that was long-term. What made the matter more critical is that SSEC could correlate the TOC to contamination of the product. These two things were enough to convince everyone that SSEC had to find a solution that would ensure consistently low 100 levels.

 

Sequence of Events

The initial response to this problem was to systematically replace all of the consumables that might have been causing the problem. The SSEC brined and burned the two-bed ion-exchange units, regenerated the mixed-bed ion-exchange units, and replaced the activated carbon resin. Ultraviolet (UV) lamps and quartz sheaths in the UV 100 reduction units were also replaced.

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