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1. What are the pretreatment needs of MEF?
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Multi-Effect Stills require the removal of chlorine, ammonia, hardness and other scales. As a minimum, a single pass RO is required. More typical is a two pass RO and possible a DI polisher. All of these systems will require chlorine removal through a carbon filter or bisulfite injection as well as hardness removal softeners or anti-scalant injection.
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2. How does MEF differ from VC?
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Thermodynamic process
Operating parameters (temperature and pressure)
Utilities
Feedwater quality / pretreatment
Maintenance
Corrosion and scaling characteristics
Dimensional differences
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3. How does the water quality of MEF compare to that of VC?
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Both MEF and VC produce water that meets the WFI requirements in the U.S. Pharmacopoeia.
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4. Is the water repeatedly distilled in an MEF from one effect to the next?
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The water is not repeatedly distilled. Each effect produces a portion of the over all output.
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5. Will I need to consider a distillate and feed water pump on an MEF unit?
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Most MEF designs use gravity to flow distillate from the condenser to the storage tank. MECO's standard unit can supply 5 psig at the edge of the skid for supply pressure to a tank. If this is not sufficient we offer a distillate pump option which can provide however much pressure is required. Most of the time you will need to provide a feed water pump. The feed water pressure requirements vary from 80-100 psig depending on the operating conditions.
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