| 摘要 |
PURPOSE:To decrease the capacity of a pump so as to reduce electric power consumption and to improve the yield of product water by incorporating an automatic flushing mechanism into the titled apparatus. CONSTITUTION:A raw water tank 1, a hollow system type ultrafilter module 3 and a pump 2 for supplying raw water to the module 3 are provided. The automatic flushing mechanism consisting of a pressure indicator for the inflow water of the module and switch PIS-1, an automatic on-off valve V-1 of a line for the permeated water discharged from the module, an automatic on-off valve V-2 for a flushing line of the concd. liquid discharged from the module, and a timer which periodically emits the signal to close the valve V-1 is incorporated into said apparatus. As a result, the need for a large volume of circulation water is eliminated, by which the smaller capacity of the pump and the smaller electric power consumption are necessitated. In addition, the smaller sizes are necessitated for the inflow piping to the membrane module and concd. water flow piping. The adjustment to the permeated water B discharged from the module/the inflow water to the module A=0.90-0.96 is possible and the yield of the product water is greatly improved.
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