FLOCCULATION TREATMENT OF WATER AND INORGANIC FLOCCULANT

摘要

PROBLEM TO BE SOLVED: To provide a flocculating method using silica and iron suitable for the flocculation treatment of city water in combination, which is attained in excellent flocculation, small in the injecting quantity of silica, small in the generation of sludge and short in the preparation time of a flocculant, and a silica-containing iron based flocculant. ;SOLUTION: The flocculation is performed by adding a polymerized silica with a ferric inorganic flocculant in an original water so as to be in a condition of the molar ratio of silica to iron of 0.5-2. And the silica-containing ferric based inorganic flocculant aq. solution containing the polymerized silica and the ferric inorganic fluocculant and having 5% silica acid concentration in the aq. solution and the molar ratio of silica to iron of 0.5-2 is used.;COPYRIGHT: (C)1999,JPO