| 摘要 |
A treatment system for removing metal ions from water. Contaminated water is first passed through nanofiltration membrane system (22a-22d) and then through one or more columns (36, 40) having ion-extracting materials therein. The nanofiltration membrane system (22a-22d) involves at least one and preferably multiple nanofiltration membrane units (22a-22d) which are capable of removing metal ions from water. To remove any residual metal ions from the permeate generated by the nanofiltration member system (22a-22d), the permeate is passed through at least one and preferably multiple columns (36, 40) 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 (36, 40) is sucessively cleaned with acid solutions.
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