Environmental Hydrotech, Inc.

      3 Hixson Road Croton-on-Hudson, NY  10520

                       Tel : (914) 271-0175   Fax: (914) 271-0174


   Water Purification Experts -  Manufacturer of Reverse Osmosis Systems -  Supplier of All Types of  Water Filters 

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Recycling of wastewater and raw materials can be very beneficial.  The most obvious candidate for recycling is rinse water.  In addition to recycling rinse water, there are often opportunities to recycle other components that make up the manufacturing process:

bulletMetal finishers can recovers metals to reintroduce to the plating bath.
bulletEthylene glycol (automotive antifreeze) can be reclaimed with membranes.  Multivalent salts, oils, suspended solids, and color are removed.  A clean ethylene glycol solution remains for reuse.
bulletCopper may be recovered from circuit board plating rinse streams.  Soluble copper sulfate is concentrated by membranes from rinse water.  The concentrate is then fed to a ion exchange unit that produces pure copper sulfate for reuse.  The purified rinse water is then reprocessed through the rinse tanks.
bulletCommercial laundry waste water is high in BOD, COD, detergents and surfactants.  A combination of membrane filters will remove oils, grease, TDS, TSS, detergents and surfactants.  The product recovered is a high quality water that may be reused, often times at an elevated temperature.
bulletLow molecular weight alcohols, primarily methanol and ethanol, are extensively used as solvents/cleaners in many industries.  Once these materials are contaminated they require costly treatment methods for reuse or must be disposed of.  Nano filtration provides an inexpensive means for on site purification for reuse.
bulletQuenchant recovery - In the heat treating of aluminum parts, quenching is accomplished with water soluble compounds such as polyalkalene glycol.  Rinsing of the aluminum parts dilutes the quenchant and the solution must be reconcentrated.  This is often done by heating the solution.  This causes the glycol to separate from the solution.  It is energy intensive and usually results in the loss of polyalkalene glycol and energy.  Ultrafiltration membranes can reconcentrate the quenchant solution while providing a significant cost savings.