PURPOSE: To efficiently flocculate water-bloom by using an inorganic flocculant containing a water-soluble chloride or sulfate of aluminum and ferric salt and a high molecular flocculant in combination and adding into the water with water-bloom generated in a specific conc. range.
CONSTITUTION: The flocculant to efficiently flocculate water-bloom breeding in lakes and marshes, ponds, reservoir ponds or the like is prepared from a material containing an inorganic material of one or more kinds of iron polysulfate, iron polychloride, ferric sulfate, ferric chloride, calcium chloride, magnesium chloride, magnesium sulfate, aluminum sulfate and aluminum polychloride. In addition to the inorganic material, one or more kinds of a cationic high molecular flocculant having 0.4-9.0meq/g in colloid equivalent value, an anionic high molecular flocculant having -0.1-(-5.0)meq/g in colloid equivalent value, a nonionic high molecular flocculant having 0-(-2.0)meq/g in colloid equivalent value and an amphoteric high molecular flocculant having -0.6-4.5meq/g in colloid equivalent value are used.
SATO KAZUO
SAWAZAKI SHIGEO
