| 摘要 |
PROBLEM TO BE SOLVED: To improve flocculating effect and to apply a method to waste water containing a cement solidifying accelerator or the like by adding specific amounts of calcium chloride and magnesium chloride to a nonionic acrylic polymer agent and mixing, in a flocculant for flocculating suspended substances contained in a suspension. SOLUTION: In a flocculant for treating waste water being generated in sewerage works or civil engineering works, 0.5 to 10 parts of calcium chloride and 0.5 to 10 parts of magnesium chloride are incorporated into 1 part of a nonionic acrylic polymer agent. A flocculant such as a polyacrylamide, poly(ethylene oxide) or urea can be used as the nonionic acrylic polymer agent. When a suspension is treated using such the flocculant, 1.5 to 4 ppm of the nonionic acrylic polymer agent, 5 to 15 ppm calcium chloride and 5 to 15 ppm magnesium chloride are added. Thereby, the suspended substances suspending in the raw water to be treated can be rapidly flocculated and precipitated and further separated from supernatant liquid.
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