APPARATUS FOR INJECTION FLOCCULANT AUTOMATICALLY

摘要

PROBLEM TO BE SOLVED: To provide a flocculant automatically injecting apparatus for calculating the injection amount of a flocculant most suitable to the turbidity of a solid foreign matter-mixed liquid such as turbid water and injecting the calculated amount of the flocculant. SOLUTION: The injection amount of the flocculant most suitable to the turbidity of a prescribed range of each sample of the turbid water is obtained and stored as data preliminarily. The mass of an outflow pipe 4b of a mass flow meter 4 full of the turbid water is calculated from the vibration of the pipe 4b generated when the turbid water is made to pass through the pipe 4b, the mass and density of the turbid water are obtained from the calculated mass of the pipe 4b and the turbidity of the turbid water is then obtained from the calculated density. The injection amounts of the flocculant corresponding to the calculated turbidity are called from the preliminarily stored data and the most suitable injection amount is calculated by interpolation or extrapolation. As a result, the flocculant of the amount most suitable to the turbidity of the turbid water can be injected, only clear water containing no solid foreign matter can be discharged to rivers and the excess flocculant is neither mixed with clear water nor discharged uselessly.