| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a flocculating/filtering method, capable of optimizing an injection amount of PAC and capable of stably obtaining treated water, purified such that turbidity is equal to or lower than 1 degree, at all times. <P>SOLUTION: In the flocculating/filtering method for measuring the turbidity of industrial water, injecting a prescribed amount of PAC on the basis of the measured value, generating a floc by flocculating reaction, and then forcibly feeding obtained flocculated treatment liquid to a fiber filtration device by a pump to perform solid-liquid separation, the turbidity is sectioned into three of a low turbidity range in which the turbidity is 0 to C1, a high turbidity range in which the turbidity is C2 to an upper limit value (Cmax), and an intermediate turbidity range in which the turbidity exceeds C1 and is below C2 (provided that the C1 and C2 represent the turbidity determined by specific preliminary tests A and B), and on the basis of the measured value of the turbidity, a fixed amount of a PAC amount Q2 (Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>mg/L) obtained by the specific preliminary tests A and B is injected to the industrial water in the low turbidity range and the industrial water in the high turbidity range, and a PAC amount Q (Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>mg/L) stipulated in the following equation (1) is injected to the industrial water in the intermediate turbidity range. (1): Q=Q1+[(Q2-Q1)/(C2-C1)]×(C-C1). <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
