Effluent precipitation and neutralization vessel and method
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United States of America Patent
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Aug 11, 1998
Grant Date -
N/A
app pub date -
Apr 10, 1997
filing date -
Apr 10, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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