| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for purifying sewage by applying a membrane type air diffusing tube having a slit hole to the sewage whose discharge is changed largely such as industrial wastewater and domestic wastewater, diffusing air stably and intermittently over a long period without closing the hole by low ventilation energy, and implementing activated sludge treatment and biomembrane contact oxidation treatment. <P>SOLUTION: In the water treatment method, when the sewage whose discharge is changed largely such as the industrial wastewater and the domestic wastewater is subjected to the activated sludge treatment and the biomembrane contact oxidation treatment, the membrane type air diffusing tube 35 mN/m or below in surface energy, 0.4-1.0 mm in slit hole length, and 1,000-4,000 Pa in pressure loss is arranged in a treatment tank for intermittent air diffusion. <P>COPYRIGHT: (C)2003,JPO</p> |
