| 摘要 |
PROBLEM TO BE SOLVED: To effectively collect fine particles in water and also to remove uncharged particles by providing electrodes facing each other, a restriction part of an electric field formed between the electrodes, a liquid passing device for causing water to be treated to flow to between the electrodes, and a power source device for applying voltage to between the electrodes. SOLUTION: Since when high voltage pulses are applied, an electric field is formed between an anode 1 and a cathode 2, but a restriction part of the electric field is formed in openings 5a, 5b of insulating sheets 6a, 6b, fine particles in water move toward the part by dielectrophoresis to hold them in filter medium 3. In this case, since the dielectrophoresis moves the particles to a part of high electric field density irrespective of polarity of the electrodes, they are collected on both the insulating sheets 6a, 6b. By applying pulses of positive polarity, electrophoresis is caused to move the particles having negative charge to the anode side and to catch them. Negatively charged particles are thus moved more to the anode 1 side than to the cathode 2 side and are caught. Since two phenomena of dielectric dielectrophoresis and electrophoresis thus occur at the same time, particles can effectively move.
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