| 摘要 |
PURPOSE:To eliminate the adverse effect on instruments due to the inflow of air bubbles by separating the inside of the lid of the filter vessel into two systems by a partition plate, connecting a flow passage pipe and a reciprocating pump to each system, and making each system to be backwashed without intrusion of air into the vessel. CONSTITUTION:The inside of the lid 2 of the filter vessel 1 is separated into the first space 26 and the second space 27 by the partition plate 24. When the filter is backwashed, the first piston 34 of the first reciprocating pump 30 is inserted, and the processing soln. is refluxed from the inside of a hollow yarn membrane 14 on the space 26 side to the outside through an outflow pipe 28 and the first space 26. At this time, the amt. of the soln. increased by the reflux flows into the outside of the hollow yarn membrane 14 on the second space 27 side to the inside, and is drawn off from a flow passage pipe 29 and the second piston 35. Then the reverse operation is carried out. Each half of the hollow yarn membrane 14 is backwashed by this two- stage operation. The removed clad is discharged to the outside of the vessel by opening a drain pipe 5. Since air an the processing soln. are not brought into direct contact with each other in this way, there is no fear of air bubbles being included in the processing soln.
|
