| 摘要 |
PURPOSE:To wash a large amt. of fine particle efficiently in a short time by supplying circulatory liquid suspension contg. fine particles at high concn. with a linear velocity along the membrane surface within a specified range to a membrane module building a membrane therein. CONSTITUTION:A storage tank 1 contains a slurry 6 contg. 0.1-25% solid particle to be washed having 0.01-10mu particle size. A membrane module 2 comprises a hollow yarn type one using hollow yarn, etc. and a separating membrane comprises polysulphone or polyvinyl chloride, etc., and preferred pore size of the membrane is <=0.05mu. The membrane module 2 and the storage tank 1 are connected with a circulation circuit 3, and the slurry 6 is supplied to the surface of the membrane contained in the membrane module 2 to pass through the membrane with 0.5-4m/sec linear velocity on the membrane surface with a pump 7. The completion of washing of the fine particle is determined by measuring the electroconductivity and pH until the value becomes equal to the conductivity or pH of the washing liquid to be supplied to the storage tank 1. The control of the filtrate is performed in this way.
|
