| 摘要 |
PROBLEM TO BE SOLVED: To denitrify ammonia nitrogen in raw water with a batch treatment tank to thereby make a denitrification treatment apparatus at the later step unnecessary. SOLUTION: A raw water supply step for supplying raw water containing ammonia nitrogen to a batch treatment tank 1, the first denitrification step for removing ammonia nitrogen in the presence of nitrite nitrogen by the action of denitrification microorganisms using ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor, the second denitrification step for further denitrifying by adding an electron donor to the denitrified water resulting from the first denitrification step, a separation step for separating the denitrified water resulting from the second denitrification step into a supernatant and precipitated sludge, and a discharge step for discharging the supernatant are repeated in the biological denitrification treatment method.
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