| 摘要 |
PURPOSE:To efficiently remove the eutrophic substance in sewage, by adding a finely pulverized adsorbent to eutrophic sewage to suspend the same in said eutrophic sewage and applying permeation treatment to the resulting suspension by using a tubular ultrafiltration membrane module. CONSTITUTION:Eutrophic sewage (a) is stored in a reaction tank 1 and an adsorbent (b) prepared by finely pulverizing minerals having ion exchange capacity is added to said sewage to be suspended therein under stirring by a stirrer 2. Next, the resulting suspension is sent to a tubular ultrafiltration membrane module 4 by a pressure pump 2 and returned to the reaction tank 1 through a pressure valve 5. The pressure to the ultrafiltration membrane module 4 is raised by operating the pressure valve 5 during the above mentioned recirculation process and water in the suspension is allowed to permeate an ultrafiltration membrane to be discharged out of the system as clarified water. By this operation, the eutrophic substance in the sewage (a) is adsorbed by the fine powdery mineral adsorbent (b) and removed through the ultrafiltration membrane module 4.
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