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Printech, August, 2000
Re: Screenprinter Questions


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From:Matt Kaarlela(mattk1@flash.net)
Date:Wed, 23 Aug 2000 09:50:18 -0500


Keith, I can only answer the question about reusing wastewater from high pressure emulsion removal. I did set up a system to reuse wastewater collected from high pressure emulsion removal. It has been a few years but I'll try to give you the basics of how it worked. We collected all wastewater from the screenwashing process and piped it to a tank that had a roll of filter paper with a float controlled feed mechanism. The water was passed through the filter cloth which would capture the big flecks of ink, etc and let the semi-clean water pass through. The filtered water was pumped over to a bulk collection tank for reuse. After a while, the water would become too dirty to effectively clean the screens and would have to be disposed of. At that point, I would treat the water with some flocking chemistry to get the bulk of the solids (pigment, etc) to fall out. The water would be pumped through the same roll feed filter paper (pretty messy since we reused the water for weeks) and circulated back to the bulk storage tank. Once the water appeared clear, we would let it circulate in the bulk tank overnight which helped the BOD and COD loadings drop. Then we would collect a sample and have it tested for our city's discharge limits. If it passed, the tank would be pumped to sanitary sewer. I had the city inspectors out to bless the system and it worked out pretty well for us. I will mention that it did require some ongoing attention to ensure it all worked properly. However, it saved the company money as well as eliminating a waste stream so it was worth the effort. As always, check with local, state and federal rules before trying it but I hope it at least gives you some ideas. Matt Kaarlela PIA-Texas



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