| 摘要 |
A method of concentrating a platemaking waste liquid generated in processing a photosensitive planographic printing plate precursor, the method including: a platemaking step in which development and desensitization of a photosensitive planographic printing plate precursor, which has, on a support, an image recording layer that contains thermoplastic polymer particles and a photothermal conversion agent, are conducted, after exposure, in one step in an automatic developing machine, using a developer which contains an anionic surfactant, a nonionic surfactant, or the like in an amount of from 1% by mass to 10% by mass, and has a content of an organic solvent having a boiling point of from 100°C to 300°C of 2% by mass or lower, but does not substantially contain an organic solvent other than the above organic solvent; a step of evaporating and concentrating a platemaking waste liquid generated in the preceding step, using a waste liquid concentration unit, such that the ratio of the volume of the platemaking waste liquid after the concentration to the volume of the platemaking waste liquid before the concentration is from 1/2 to 1/10; and a step of condensing steam that has been separated in the preceding step, to produce reclaimed water. |
