초록 ▼

A neutral dischargeable effluent is developed by reaction between an acidic, spent photographic fixer liquid and an alkaline, spent photographic developer liquid; the spent fixer liquid contains iron in solution, the iron being introduced in a de-silvering pretreatment of the spent fixer liquid. The

A neutral dischargeable effluent is developed by reaction between an acidic, spent photographic fixer liquid and an alkaline, spent photographic developer liquid; the spent fixer liquid contains iron in solution, the iron being introduced in a de-silvering pretreatment of the spent fixer liquid. The two liquids are fed into a treatment chamber and are allowed to react in the treatment chamber to form a neutral liquid and precipitated iron-containing solids; the solids settle in the treatment chamber and the neutral liquid rises upwardly through a synthetic organic polymer fiber filter pad into a discharge chamber above the filter pad; fine sticky particles suspended in the rising neutral liquid are retained by the filter pad; a neutral effluent is discharged from the discharge chamber.

대표청구항 ▼

[ We Claim:] [1.] A precipitation and neutralization vessel for treating spent photographic fixer and developer liquid, comprising:i) a housing having a floor, a wall extending upwardly from said floor, and an open top,ii) a cover for removably covering the housing open top,iii) an upper chamber and

[ We Claim:] [1.] A precipitation and neutralization vessel for treating spent photographic fixer and developer liquid, comprising:i) a housing having a floor, a wall extending upwardly from said floor, and an open top,ii) a cover for removably covering the housing open top,iii) an upper chamber and a lower chamber defined within said housing,iv) a compressible filter pad separating said upper and lower chambers, said pad being of synthetic organic polymer fibers, said pad being held under compression,v) inlet means in said wall in communication with said lower chamber, for introducing spent photographic fixer and developer liquids directly into said lower chamber, said inlet means being arranged to allow for formation of a neutral liquid and precipitated settled solids in said lower chamber,vi) outlet means in said wall in communication with said upper chamber, for discharge from said housing, of liquid in said upper chamber, said outlet means being arranged to receive filtered neutral liquid flowing from said lower chamber through said filter pad and into said upper chamber.vii) water inlet means in said wall, said water inlet means having an outlet port in communication with said outlet means.