| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystallization dephosphorization method by which a proper amount of an additive can be injected according to the changes in the flow rate of waste water containing phosphorus introduced into a reaction crystallization tank. SOLUTION: The crystallization dephosphorization method features that: the relation between the superficial velocity of waste water containing phosphorus in the reaction crystallization tank 1 and the objective pH appropriate for the dephosphorization of the waste water containing phosphorus is preliminarily determined; the objective pH value is varied according to the superficial velocity of the waste water containing phosphorus introduced into the reaction crystallization tank 1 on the basis of the above relation; and the addition amount of a calcium compound and/or an alkali agent to be supplied to the reaction crystallization tank 1 is controlled to obtain the objective pH. COPYRIGHT: (C)2003,JPO
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