FLOCCULANT INJECTION CONTROL METHOD OF PURIFICATION PLANT

摘要

PROBLEM TO BE SOLVED: To provide a flocculant injection control method of a purification plant suitable for maintaining a flocculant injection ratio appropriately when injecting two flocculants together.;SOLUTION: A coagulation precipitation process includes injecting the flocculant into obtained raw water, floccurating suspended matters in the raw water, and separating the formed flock in sedimentation. In the process, an aluminum-based flocculant and an iron-basen flocculant are injected together into the raw water, the iron-based flocculant injection ratio is increased as the pH of the raw water rises by increasing the iron-based flocculant injection ratio and decreasing the aluminum-based flocculant injection ratio.;COPYRIGHT: (C)2011,JPO&INPIT