公开(公告)号：US5034137A

公开(公告)日：1991-07-23

申请号：US495269

申请日：1990-03-16

申请人： Sohei Okamoto ,  Jiro Hirano ,  Takusaburo Ohnishi

发明人： Sohei Okamoto ,  Jiro Hirano ,  Takusaburo Ohnishi

IPC分类号： C02F1/56 ,  C02F1/52 ,  C02F1/54

CPC分类号： C02F1/5236 ,  C02F1/54

摘要： A method for treating muddy water which comprises adding a first chemical containing an alkali metal or alkaline earth metal oxide or hydroxide to muddy water to be treated, thereby rendering muddy water alkaline, adding a second chemical containing an anionic polymer coagulant to muddy water simultaneously with or after the addition of the chemical, further adding a third chemical containing a sulfate thereby rendering the muddy water weakly alkaline, and then adding a fourth chemical containing an anionic polymer coagulant to muddy water. As a result, large-sized and hard flocs are produced.