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The DTF Module System for Nano Filtration
With the use of nanofiltration technology, water recovery
from waste of over 90 % can be achieved. The very small amount
of soluble CaSO4 is safely controlled in the nanofiltration
modules and filtered out of the raw solution.
The downstream RO unit (nanofiltration permeate) performs
the desalinization of monovalent ions. By removing CaSO4,
the NF System reduces the limiting factors in the RO unit,
specifically membrane scaling and solids removal. Water impurities
concentrated in the nanofiltration stage precipitate in a
reaction tank. Due to a total increase in concentration of
up to 50 times (98% water recovery), many waste waters have
a very high osmotic pressure. The nanofiltration permeate,
therefore, is treated by a high pressure RO system operating
at 1800 PSI.
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