| 摘要 |
PROBLEM TO BE SOLVED: To measure turbidity even when a substance with a refractive index being similar to that of water is mixed by providing a particle counter at the inlet side of a filtration pond, and at the same time by providing a second particle counter and a permeation-scattered-light-system turbidimeter at an outlet side. SOLUTION: A particle counter 4 is provided at the inlet side of a filtration pond 1, and at the same time a second particle counter 2 and a permeation-scattered-light- system turbidimeter 3 are provided at an outlet side. The second particle counter 2 can measure the number of particles being mixed into water for each diameter of the particle. For example, the second particle counter 2 that has a measuring range where the diameter of the particle is set to 2-6μm, 5-10μm, and 10-15μm is used. Also, the measuring range of turbidity is set to approximately 0-0.2. Then, when the turbidity is changed, a turbidity substance is confirmed by the particle counter 2. More specifically, when the turbidity exceeds a setting level (for example, 0.1 degrees), it is estimated that a crypto germ is mixed if the counting value of the particle with a diameter of 4-6 m being measured by the particle counter 2 is increased. Also, when the diameter of the particle at the outlet side becomes larger than that at the inlet side, it is estimated that the function of the filtration pond is decreased.
|
