Method of treating photographic processing wastes
AssigneeFuji Photo Film Co., Ltd.
InventorsSeiji Suzuki, Kozo Aoki, Hiroshi Ishizuka, Yoshiya Ohara
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Abstract
A method of treating photographic processing wastes is disclosed. The method comprises (1) mixing a silver-recovery system waste and a development system waste from photographic processing to produce a waste mixture, (2) adding to said waste mixture phosphorus as a nutritive substrate in an amount corresponding to at least 2% based on the COD value of the waste mixture, and (3) subjecting the resulting waste mixture to a bio-oxidation treatment using microflora containing sulfur-oxidizing bacteria. The method enables a continuously treatment of high concentration photographic processing wastes with high efficiency over a long period of time.
Claims14
A method of treating photographic processing wastes, which comprises
- (1) mixing a silver-recovery system waste and a development system waste from photographic processing to produce a waste mixture,
- (2) adding to said waste mixture phosphorus, in the form of a compound selected from the group consisting of KH.sub.2 PO.sub.4, K.sub.2 HPO.sub.4, NaH.sub.2 PO.sub.4 .multidot.2H.sub.2 O, and Na.sub.2 HPO.sub.4, as a nutritive substrate in an amount corresponding to at least 2% based on the COD value of the waste mixture, and
- (3) subjecting the resulting waste mixture to a bio-oxidation treatment carried out by aeration using microflora containing sulfur-oxidizing bacteria selected from the group consisting of the Thiobacillus genus, the Thiotrix genus, and the Beggiatoa genus, and
- (4) subjecting the bio-oxidation treated waste mixture to an electrolytic oxidation treatment at a pH of 7 or higher.
Dependencies are inferred from the claim text.