Multi-stage water treatment system and method for operating the same
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United States of America Patent
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May 10, 1994
Grant Date -
N/A
app pub date -
May 25, 1993
filing date -
May 25, 1993
priority date (Note) -
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Abstract
A treatment system for removing metal ions from water. Contaminated water is first passed through a nanofiltration membrane system, and then through one or more columns having ion-extracting materials therein. The nanofiltration membrane system involves at least one and preferably multiple nanofiltration membrane units which are capable of removing metal ions from water. To remove any residual metal ions from the permeate generated by the nanofiltration membrane system, the permeate is passed through at least one and preferably multiple columns filled with porous polymer beads having metal ion extracting agents therein (e.g. biomass materials). As a result, highly purified water is produced. When saturated with ions, each bead-containing column is successively cleaned with acid solutions.
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