| 摘要 |
PROBLEM TO BE SOLVED: To efficiently and stably remove nitrogen from waste water with an ammonia nitrogen concn. of above 100 mg/l by using autotrophic bacteria. SOLUTION: When nitrite nitrogen and nitrate nitrogen in waste water are reduced to nitrogen gas by using autotrophic bacteria to be removed from waste water, the floating outflow of autrotrophic bacteria from a denitrification tank 2 is prevented by using a membrane separator 4 or a filter to increast the concn. of autrotrophic bacteria in the denitrification tank 2. As autrotrophic bacteria, granulated sulfur oxidizing bacteria or sulfur oxidizing bacteria having self-granaulation action are pref. used. The membrane separator 4 to be used pref. uses a membrane with a pore size of 500μm or less and the filter to be used pref. is packed with a filter medium with a particle size of 3 mm or less.
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