Rejection characteristics of metals under different chemical speciation in the nanofiltration membrane process.
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概要
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Reject ion characteristics of metals by nanofilteration membranes were examined. Chloride ions, sulfate ions, and organic compounds represented by TOC, which are found in high concentration in the landfill leachate, were more highly rejected by nanofiltration membranes than metals. Separation coefficient, which is the ratio of the metal permeation rate to the chloride ion or TOC permeation rate, was introduced to consider the rejection characteristics of various heavy metals in the leachate by the nanofiltration membrane. In spite of different materials and different nominal salt rejection of nanofiltration membrane used, the rejection tendency of every metals in the leachate was nearly the same. In part icular, the separation coefficient of arsenic against chloride ion and TOC was larger than any other separation coefficient of heavy metals. That is to say, arsenic is easy to go through the nanofilteration membrane. To certify why the rejection of arsenic is low in nanofilteration membrane, the rejection characteristics of arsenic spieces such as arsenite, arsenate, and DMAA, was investigated in nanofilteration membranes. Both arsenate and arsenite showed high rejection in the pH range where they exist in ion form. In the case of DMAA, the high rejection was always observed in wide range of pH. A high rejection of DMAA by nanofilteration membranes might be caused by a certain mutual interaction between membrane and solute.
- 公益社団法人 土木学会の論文
公益社団法人 土木学会 | 論文
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