| 摘要 |
PURPOSE:To enhance the oxygen dissolution efficiency of an aerobic bioreaction chamber by using a spiral type membrane module wound with a separating membrane via a spacer of a corrugated board shape on the outer periphery of a water collecting pipe as the membrane module of a membrane separator. CONSTITUTION:Raw water is introduced from a piping 11 into the aerobic biochemical reaction chamber 1 and is subjected to a aerobic biochemical reaction treatment. The treated liquid is introduced through an introducing piping 12 into the membrane separator 2 and air is supplied to this liquid from a supplying piping 15 to form the air-liquid mixture which is introduced into the membrane separator 2. While the permeated water of the membrane separator 2 is taken out as treated water, the concd. water is returned to the aerobic biochemical reaction chamber 1. The air in the bubble-mixed liquid flowing into the membrane separator 2 dissolves sufficiently into the liquid during flows together with the liquid in the membrane module 2B. The liquid into which the air is sufficiently dissolved is returned to the aerobic biochemical reaction chamber 1 after the passage through the membrane module 2B and is thereby extremely efficiently biologically treated. |
