Process for treating photographic waste water
AssigneeFuji Photo Film Co., Ltd.
InventorsTakashi Nakamura, Koji Matsuo, Masaharu Yamada
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Abstract
A process for treating a photographic waste liquid containing a used processing liquid resulting from a processing step having a bleaching ability or a fixing ability in the processing of a silver halide photographic material which process comprises adding a polymer-complex-forming agent to the waste liquid in an amount in the range of from 0.5 to 4 equivalents to a metal contained in the waste liquid to thereby form a polymer-metal complex and then filtering off the polymer-metal complex with a mono-membrane filter having a pore size of 0.05 to 10 .mu.m to thereby remove the metal. A device for use in practicing the process is also disclosed.
Claims14
A process for treating a photographic waste water containing a used processing liquid resulting from a processing step having a bleaching ability or a fixing ability in the processing of a silver halide photographic material, which process comprises adding a polymer capable of forming a complex with at least one metal in the waste water to the waste water in an amount in the range of from 0.5 to 4 equivalents to a metal contained in the waste water to thereby form a polymer-metal complex and then separating the polymer-metal complex with a single layer membrane filter having a pore size of 0.05 to 10 .mu.m to remove the metal,
- wherein one metal of the at least one metal is silver, and
- wherein the polymer-metal complex has a size which is smaller than the pore size.
The process for treating a photographic waste water as claimed 3, wherein the hydrophilic linear polymer is a water-soluble linear polymer having a dominant water-solubilizing group, wherein a dithiocarbamate functional group is the dominant water-solubilizing group.
The process for treating a photographic waste water as claimed in claim wherein the complex-forming polymer is added to the waste water in an amount in the range of from 0.8 to 3 equivalents to a metal contained in the waste water.
Dependencies are inferred from the claim text.