Development of Small-scale and On-site Water Treatment System Using Activated Carbon Membrane

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1) Bidispersed StructureIt was found that the activated carbon membrane developed in this work has micropores of 0.6 - 0.9 nm in diameter and mesopores of about 10 nm in diameter. The former was formed when the precourcer, polymer microsphere, was thermally decomposed and dechlorinated and controls its adsorption properties. The latter is considered to be spaces among microshperes and controls the water permeation. The total pore volume was 0.30 ml/g and the specific surface area was about 750 m2/g.This bidisperced structure was suspected from the results of permeation measurements of pure water and also molecular weight cut-off data. SEW observation showed that the activated carbon membrane not only formed a skin layer of ceramic support but also penetrated into the support to a certain degree of depth, which resulted in mechanical strength enough to be used in ordinary water treatments.2) Electricthermal RegenerationIt was noted that the activated carbon membrane has the suitable por … More osity and electric conductivity. Then the electricthermal regeneration was proposed and demonstrated in this work, which was carried out by direct charges of electricity to the membrane. Since the activated carbon membrane was very thin, it was heated up very quickly by direct charges of electricity. It can be said that very quick regeneration can be done by this novel regeneration method in principle, however further investigation on heat balances are needed in details. The proper temperature and time for this regeneration vary with the adsorbate. The virgin and regenerated membrane almost shoved the same permeability and adsorption capacity.Activated carbon membrane developed in this work for water treatments has functions of filtration and adsorption, which enable the higher permeability at lower pressure and the higher removal of lower molecular weight organic substances. It can be concluded that this novel activated carbon membrane is promising as a new tool for compact one-step water treatments. Less