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to recycle water from wastewater with RO usually requires pretreatment like sand filters, carbon filters and ultrafiltration (UF). ��� Both technologies require that non-emulsified oil and grease be removed prior to processing. ��� One of the most important advantages of MVRE over membrane filtration is its ability to make clean water from saturated or even crystallizing brines, achieving total dissolved solids (TDS) levels of more than 600,000��mg/L. In comparison, membrane technologies can make clean water from sources no higher in TDS than about 35,000��mg/L. ��� MVRE units are generally constructed of 316 stainless steel for all parts in contact with the wastewater. This grade of stainless steel has a fairly good tolerance to corrosion except where chlorides are concerned. In principle, wastewaters with chloride concentrations greater than 5 mg/L are likely to exhibit severe corrosion with this grade of stainless steel due to the high concentration ratios in the final stages of evaporation. In such cases, more corrosion-resistant and costly materials are required. ��� MVRE is not intended for operation with volatile, flammable or potentially explosive substances. During the process, any substance more volatile than water will condense with the steam, reducing overall distillate quality. WHEN CLEAN COUNTS ��� �� �� �� �� �� �� �� Aqueous cleaning Hydrocarbon cleaning Green technology Safe for brass & copper In-stock, fast delivery options USA service & installation team Low monthly lease payments Highly effective cleaning machines to remove oils, greases, emulsions and chips. Mention this ad for a free cleaning trial of select parts. Contact us: usa@ecoclean.durr.com Wastewater applications for MVRE include oily emulsions, parts washing, surface treatment rinse water, dye penetrate (FPI) rinse water, vibratory finishing, quenching, die casting and extrusion, DI regeneration, and UF permeates. MVRE UsEd in VaRiEty of CasEs One example of the technology in action is an aircraft engine manufacturer that uses MVRE alongside its parts washer. The evaporator continuously purifies the rinse baths to low conductivity levels (10-30 ��s/cm), and rinse water is used for wash water makeup to create a zerodischarge system. An automotive parts manufacturer also uses MVRE in conjunction with UF to recycle water from metal working fluids and parts washing solutions. The UF permeate is distilled with MVRE to recycle the water content, and the concentrated oil (retentate) is sold for its calorific value. As yet another example, an aerospace company uses MVRE to recycle all of its rinse water used in rinsing dye penetrants in their crack detection process. The wastewater containing fluorides and hydrocarbons produces water for reuse with a conductivity level of less than 5 ��s/cm. n Robert Burns is president of Proceco Ltd. For more information, please visit Proceco.com. www.durr-ecoclean.com/usa/cleaning pfonline.com 33