Products Finishing

JAN 2013

Products Finishing magazine is the No. 1 industrial finishing publication in the world. We keep our readers informed about the latest news and trends in plating, painting, powder coating, anodizing, electrocoating, parts cleaning, and pretreatment.

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separate Water, ConCentrate Waste mixture, which in turn produces more steam. This recycling of heat is what renders MVRE so efficient. As little as 225 w per gal are consumed by the process, compared with 2,400 w per gal required by atmospheric wastewater evaporators. Water More Volatile than other Waste In wastewater processing, the water portion of the waste is more volatile than the other components of the mixture. The steam is then condensed to produce clean water and the remaining, less-volatile components concentrate in the boiling chamber. Over time, the concentrated waste reaches a saturation point and must be discharged for waste disposal. Commercially available units can process as many as 1,000 gal of wastewater per hr, and smaller, more compact units are capable of processing 18 gal per hr or 400 gal per day. The units generally operate unattended and create zero emissions other the concentrated waste. Units equipped with a clean-in-place subsystem run a descaling cycle which takes just a few hours a month. Evaporators such as the ��co-Smart from Proceco use a roots compressor to create a partial vacuum in the boiling chamber, reducing the boiling temperature of the liquid by as much as 30��F. The vapor is compressed to slightly above atmospheric pressure and then condensed. To ensure the highest quality distillate, a multistage separator eliminates trapped liquid droplets from the vapor phase. An additional heat exchanger uses some of the sensible heat remaining in the distillate to preheat incoming wastewater, increasing the overall efficiency of the process. The ��coSmart uses no pumps or heaters other than the compressor to heat and move the fluid, relying strictly oily emulsion, before and after MVre. (Image courtesy of Proceco Ltd.) on natural circulation created by the vacuum distillation process. Its vertical heat exchanger arrangement reduces fouling by enabling particles to settle in the concentration tank rather than on the heat transfer surfaces. Relentless Pursuit Membrane filtration (i.e., ultrafiltration, reverse osmosis) and MVRE both serve to separate water and concentrate waste streams, and each technology has its place in waste treatment with limitations, including: ��� Membrane systems generally present a lower up-front investment, but can be more expensive to operate when one considers membrane life and maintenance cost. ��� Organic/polymeric membrane systems don���t fare well in hightemperature or harsh chemical environments. ��� Unlike reverse osmosis (RO), MVRE can handle incoming wastewater concentration of solids of 5 percent and solid particles as large as 1000��m. Attempting of Filtration Model NCO ��� O-ring sealed - EPR, Buna N, and Viton�� ��� 1-1/2- or 2-inch ��� NPT inlet and outlet ��� Permanently piped housings open without special tools ��� Carbon or stainless steel housings ��� 150 psi rated housing ��� Heavy-duty basket, over 50% open area ��� Uses standard size bags and cartridges ��� Adjustable legs NEW FROM ROSEDALE Coolant Filter Housings! All aluminum housings are excellent for machine tool coolants and coolant towers. Rosedale FiltRation PRoducts 3730 W. Liberty Road, Ann Arbor, MI 48103 Tel 800-821-5373 or 734-665-8201 Fax 734-665-2214 ���lters@rosedaleproducts.com www.rosedaleproducts.com See our WebSite pfonline.com 31

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