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Exergy’s advanced membrane-based systems include Advanced Diffusion Dialysis (DD), Advanced Electrodeionization (AEDI), Membrane Electrolysis (ME), Electrodialysis (ED) and Reverse Osmosis (ARO). The company also provides conventional membrane technologies such as ultrafiltration to complete its designs.
Advanced Membrane Separation Systems
ADVANCED ELECTRODEIONIZATION (AEDI)
Applications:
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Direct recovery of electrolytes from active rinses
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Recovery and recycling of process water and wastewater in industrial applications
Features:
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Clean (electrochemical) technology
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Low maintenance
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High recovery rate
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Low total dissolved solids (TDS) product water
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Cost-effective water purification
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Option to recycle chemicals
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Custom designed for special operations
AEDI devices remove ionizable constituents from water using ion exchange membranes, ion exchange resins, and a DC electric potential. AEDI provides two technologies in one module: electrodialysis and ion exchange.
ADVANCED DIFFUSION DIALYSIS (DD)
Applications:
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Direct recovery of electrolytes from active rinses
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Recovery and recycling of process water and wastewater in industrial applications
Features:
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Uses (5.4% in volume) water to remove continents to central waste treatment or metal recovery
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Fully automatic and continuous operation
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Chemical resistant membranes that last up to five years for typical applications
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Acid feed filtration
Diffusion Dialysis uses ion exchange membranes to recycle used or spent industrial acids. Exergy's patent pending "one piece" membrane spacers create compartments with appropriate cell distances for optimum diffusion.
MEMBRANE ELECTROLYSIS (ME)
Applications:
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Purification and regeneration of chromium plating baths
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Recycling and maintenance of chrome conversion coating solutions
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Reactivation and metal removal from deoxidizing solutions
Features:
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Maintains process solutions for consistent performance and quality
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Maintains solutions for constant production rates
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Accurate, high-quality etching and chrome conversion coating results
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Reduces reject rate (reduces reprocessing)
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Reduces wastewater treatment and waste disposal
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Reduces fresh process solution usage
Membrane Electrolysis is a membrane process driven by an electrolytic potential. It is used for the removal of metallic impurities from metal finishing solutions. ME uses an ion exchange membrane and an electrical potential applied across the membrane.
ELECTRODIALYSIS (ED)
Applications:
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Desalination
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Direct recovery of process water and electrolytes from stagnant rinses
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Purification of plating baths
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Demineralization of cheese whey
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Removal of nitrates from groundwater
Features:
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High efficiency cells
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High membrane packing density, thin cells
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Low voltage
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Excellent distribution
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Excellent tightness
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High limiting current density
ED systems separate ionic species from aqueous solutions using an applied direct current potential across ion-permeable and selective membranes. Exergy's ED systems feature the ED cell frame, which is optimized to provide high separation performance.
ADVANCED REVERSE OSMOSIS (ARO)
Applications:
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Produce high-quality rinse water and recyclable concentrates from wastewater
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Closed-loop operation of chrome conversion coating processes
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Recovery of plating solutions and rinse water (copper, nickel, and noble metals)
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Industrials process wastewater recovery
Features:
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Produces high-quality permeates and concentrates for recycling process fluids
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0.5-13 pH range of operation
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Recycling pump reduces energy use
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Operator Interface Unit (OIU) allied auto (PLC) or manual control and provides status information
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Pre-assembled modular systems
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High-quality, heavy-duty components
Exergy’s ARO achieves superior performance when compared to conventional Reverse Osmosis. ARO operates at 1,000 psi to produce higher concentrations in concentrates and better quality permeates. ARO uses a patented membrane treatment process that allows the process to operate efficiently in a pH range from 0.5 to 13.
Conventional Membrane Separation Systems
REVERSE OSMOSIS (RO)
Applications:
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Desalination of process and rinse water
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City water and process water purification
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COD reduction
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Recovery of specialty chemicals with the concentrate
Features:
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High-quality pretested membranes
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Exacting standards to ensure proper membrane size
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Spiral winding of separators using special fabrication techniques
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Quality tested using both salt and dye solution
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pH range from 2 to 10
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High flux even at elevated solid concentration in the feed
AEDI devices remove ionizable constituents from water using ion exchange membranes, ion exchange resins, and a DC electric potential. AEDI provides two technologies in one module: electrodialysis and ion exchange.
ULTRAFILTRATION (UF)
Applications:
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Oil/water separation
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Water purification
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COD reduction
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Recovery of specialty chemicals
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Hazardous waste remediation
Features:
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High quality pre-tested membranes
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Exacting standards to ensure proper membrane size
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Spiral winding of separators using special fabrication techniques
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Quality tested using both salt and dye solutions
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pH range from 0-13
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Permeate capacity from 60 to 2,220 I/h (16 to 587 gph)
Ultrafiltration is a membrane separation technology that retains target compounds and allows passage of the remaining process solution. Membranes used in Exergy’s UF systems are manufactured from basic plastic polymers to engineer membrane pores of a specific submicron size, typically in the range of 0.0001 to 0.1 micron.
MIRCROFILTRATION (MF)
Applications:
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Brine cooker water
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Fruit juices
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Fermentation broth
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Sugar syrups
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Metal finishing solutions
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Dye rinse water
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Well water
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Wastewater
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Alkaline cleaner
Features:
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High quality pre-tested membranes
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Exacting standards to ensure proper membrane size
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Handles particle sizes between 5 to 0.05 microns
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Removes mechanically and chemically emulsified oils, fatty acids, particulates, clay, and bacteria
Microfiltration is a water and suspended solids filtration technology that can be operated as crossflow separation or through perpendicular filtration. Exergy offers many microfiltration options as well as custom systems to meet special requirements