초록 ▼

A method is provided herein for the treatment of sewage or other impure water. The method includes adding, to the sewage or other impure water in a mixing zone, all three individually but no more than two premixed together of the following: (a) an inorganic coagulant, (b) an anionic polymer, and (c)

A method is provided herein for the treatment of sewage or other impure water. The method includes adding, to the sewage or other impure water in a mixing zone, all three individually but no more than two premixed together of the following: (a) an inorganic coagulant, (b) an anionic polymer, and (c) a cationic polymer, with intimate mixing of the added chemicals with the sewage or other impure water, with the proviso that (d) the inorganic coagulant, either alone or with the anionic polymer or the cationic polymer, cannot be added last; and (e) the anionic polymer and the cationic polymer cannot be intimately mixed and added together. This provides chemically-treated effluent having large, compact, firmly bonded, substantially-shear resistant and rapidly-separatable flocs therein. The flocs are separated from the liquid in a separating zone. Finally treated effluent effluent is removed from the separating zone.

대표청구항 ▼

A method for the treatment of sewage or other impure water which comprises: (1) adding and with intimate mixing to said sewage or other impure water in a mixing zone components: (a) an inorganic coagulant which comprises an aluminum salt or an iron salt in an amount of from about 10 to 300 ppm parts

A method for the treatment of sewage or other impure water which comprises: (1) adding and with intimate mixing to said sewage or other impure water in a mixing zone components: (a) an inorganic coagulant which comprises an aluminum salt or an iron salt in an amount of from about 10 to 300 ppm parts by weight, (b) an anionic acrylamide polymer polyectrolyte in an amount of from about 0.1-10 ppm parts by weight, and (c) a cationic amine or acrylamide polymer polyelectrolyte in an amount of from about 0.1-10 ppm parts by weights, wherein all three components are individually mixed but no more than two of said components are premixed together; with the proviso that said inorganic coagulant either alone or with the anionic polyelectrolyte or the cationic polyelectrolyte cannot be added last; and said anionic polyelectrolyte and said cationic polyelectrolyte cannot be intimately mixed and added together, thereby to provide a chemically-treated liquid effluent having large, compact, firmly-bonded, substantially-shear resistant and rapidly-separable flocs therein; (2) separating the flocs from the chemically-treated liquid effluent in a separating zone; and (3) removing said chemically-treated liquid effluent from the separating zone.