Photographic effluent treatment apparatus

Details Photographic effluent treatment apparatus Photographic effluent treatment apparatus

1995-11-30

1997-11-25

McCarthy, Neil

Liquid purification or separation

With time control

210205, 210206, 210252, 210259, C02F 162, C02F 152

Patent

active

056908172

ABSTRACT:
It is known to treat the effluent resulting from photographic processing apparatus. Such treatment takes the form of either neutralization where the effluent is mixed with a neutralizing solution prior to disposal, or evaporation where the effluent is heated to form a precipitate and a concentrated liquid portion prior to disposal. However, both these techniques have disadvantages they do not account for toxic particles which may be suspended in the solutions. Described herein is apparatus in which photographic effluent can be treated to provide harmless end products which can be disposed of directly. The apparatus comprises a mixing unit (10) in which the effluent (S1) is mixed with treatment chemicals (S2, S3, S4, P1, P2, P3) and is then passed to a separation unit (20) in which the treated effluent is separated into non-toxic liquid and solid phases. A computer (100) is used to control all stages of the treatment of the effluent.

REFERENCES:
patent: 4329042 (1982-05-01), Libicky et al.
patent: 4332687 (1982-06-01), Daignault et al.
patent: 4465593 (1984-08-01), Wemhoff
patent: 4755453 (1988-07-01), Kunda et al.
patent: 4874530 (1989-10-01), Kabayashi et al.
patent: 4977067 (1990-12-01), Yoshikawa et al.
patent: 5211843 (1993-05-01), Wester et al.

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