PROCESSING METHOD FOR NON-SILVER SALT PHOTOSENSITIVE MATERIAL AND DEVICE USED FOR THE SAME

摘要

PURPOSE:To reduce the recovering cost of a washing waste water and to prevent environmental pollution by adjusting pH of water to a specific range after separating a recirculating washing water into a solute matter and the water. CONSTITUTION:The recirculating washing water is sent to a neutralizing and flocculating tank 43 and a neutralizing agent in a neutralizing agent vessel 45 is supplied to the neutralizing and flocculating tank 43 by a pump 50b so that the pH value measured by a pH meter 54a is in the prescribed pH range. Next, the solution in the neutralizing and flocculating tank 43 is fed to a centrifugal separator 60 by working a pump 57, is centrifugally separated into a filtrate and a residue and the filtrate is housed in a filtrate tank 62. The neutralizing agent in the neutralizing agent vessel 65 is fed to the filtrate tank 62 so as to be pH 5.0-9.0 by a control system 55b based on the pH value of the filtrate measured by the pH meter 54b using a glass electrode 53b to adjust pH. The filtrate adjusted in pH is discharged by opening a valve 66.