| 摘要 |
<p>PURPOSE:To improve efficiency in dissolving oxygen and to increase the dissolved oxygen concn. by vertically providing a partition plate in a deep aeration tank >=10m deep to form an upward passage and a downward passage, furnishing an upper diffuser and a lower diffuser and further providing a passage for a gas staying in the top cavity to the upper diffuser. CONSTITUTION:A water A to be treated contg. org. matter such as sewage and night soil supplied to an aeration tank 1 is air-lifted by a concd. oxygne D introduced from a lower diffuser 6, circulated through the upward passage 3 and downward passage 4 of the tank 1 and aerobically oxidized. An appropriate amt. of return sludge G from a settling tank 40 is introduced through a sludge inlet pipe 33, and the fine bubble regenerated at the shallow part deposits on activated sludge which is thereby floated. The gas E staying in the top cavity of the tank 1 is introduced by a circualting blower 11 from the upper diffuser 5 through a passage 10 to promote the settling of the activated aludge.</p> |
