| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for suppressing a sewage pressure-feed duct from becoming anaerobic with which dissolved oxygen in sewage water is secured even in a long-distance pressure-feed duct and the inside of the sewage pressure-feed duct can be suppressed from becoming anaerobic further. <P>SOLUTION: According to a method for suppressing a sewage pressure-feed duct from becoming anaerobic, the inside of a pressure-feed duct 10 is suppressed from becoming anaerobic by injecting gas from gas injection means 16 into sewage water which is pressure-fed by a pressure pump 15. In this method, after ozone is injected from the gas injection means 16 into the sewage water pressure-fed in an upstream part of the pressure-feed duct 10, the sewage water into which ozone has been injected is passed through one or more stirring pipe parts 17, 17 which are interposed on a downstream side rather than the gas injection means 16 of the pressure-feed duct 10, thereby stirring the sewage water. <P>COPYRIGHT: (C)2013,JPO&INPIT |
