| 摘要 |
PROBLEM TO BE SOLVED: To provide a treatment method for gravel waste water which is capable of achieving an efficient settlement velocity in spite of the waste water of a gravel digging site and is capable of saving the amount of addition as compared to the case a cationic polycondensation system high-polymer material is used. SOLUTION: The polymerization system aqueous cationic high polymer consisting of a dispersion of high-polymer particulates of <=100μm in grain size produced by a dispersion polymerization process in the copresence of a dispersant consisting of a high polymer soluble in an aqueous salt solution in this aqueous salt solution and the anionic water-soluble high polymer consisting of the dispersion of the high-polymer particulates of <=100μm in grain size produced by the similar polymerization process are added and mixed in this order to and with the inorganic particle suspended water, such as the gravel cleaning waste water and the mixture is subjected to a separation of solid from the liquid without flocculation.
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