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An Investigation in Rinse Water Sustainability
This paper investigates options for improving sustainability in Class II and III manufacturing environments by studying options for reusing and/or recycling rinse water.
Technical Paper
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Authored By:
Ram Wissel
KYZEN Corporation
TN, USA
Rod Chilton
ITW / EAE
MO, USA
Summary
Today’s society is more focused on sustainability and recycling than ever before, which is good for our planet. Manufacturing Class III hardware has cleaning requirements, almost always involving high-purity de-ionized (DI) rinse water. It’s often been said, “You’re only as clean as your final rinse,” as incomplete rinsing can lead to decreased device reliability, lifespan, lower yields, rework, and other manufacturing costs. Therefore, ensuring high-purity water is available in sufficient quantity is critical for ensuring reliable production.
Many small footprint, or “batch” style cleaners have closed-loop rinse water options that recycle rinse water. However, high production volume in-line washers can consume over 2,000 gallons of DI water per 8-hour operating shift. This can be a challenge as water becomes a more precious resource, especially in certain parts of the world.
This paper investigates options for improving sustainability in Class II and III manufacturing environments by studying options for reusing and/or recycling rinse water.
Conclusions
This paper is intended to be a guide to understanding key factors when evaluating methods to recycle the chemical isolation water from an in-line aqueous cleaning process. Every installation or process will be unique based on the equipment, the cleaning agent, the size and quantity of assemblies being washed, etc.
Measuring the concentration and flow of the wastewater stream is an important first step. The volume may be displayed on the machine or easily estimated based on nozzle type and spray pressure. Your cleaning agent supplier or 3rd party labs can help measure the contamination levels.
Directly disposing of water that may be 99.9 to 99.95% pure will be costly due to the volume of water generated. As water becomes more precious and more restrictive disposal or emission regulations come into play, recycling the rinse water will become a more common need. Having an air knife at the exit end of the wash section can make a 2-3x reduction in the volume of wash solution carried over into the chemical isolation. This significantly affects the overall amount of contamination that must be removed if the rinse water is recycled, and it reduces total wash chemical consumption.
Activated carbon and DI resin are both highly effective at adsorbing their respective organic and ionic contaminants. That occurs very quickly right up to the point of saturation, beyond which the consumable media is ineffective and needs to be replaced/regenerated.
Incorporating an RO system can be a very effective option when recycling rinse water and greatly reduce the amount of carbon and DI resin required, possibly by a factor of 10 or more.
Future work will include further understanding the adsorption potential of carbon and DI resin media across different cleaning agent types.
Initially Published in the SMTA Proceedings
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