Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1985-11-12
1987-10-06
Hruskoci, Peter
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210724, 210726, 210906, 210915, 423321R, C02F 152
Patent
active
046981632
ABSTRACT:
A method is provided for treating contaminated wastewater of pH ranging from about 1.5 to 3 containing phosphate ions and fluoride ions. The method comprises treating the said wastewater with an amount of alkaline agent selected from the group consisting of limestone (CaCO.sub.3) and lime [CaO or Ca(OH).sub.2 ] sufficient to raise and maintain the pH at a level of about 3.5 to 6.5 following uniform mixing thereof in a first stage precipitation step to effect substantial precipitation of the contaminants. The treated wastewater is passed to a first stage settler to effect solid/liquid separation and provide a sludge of the precipitated contaminants which is removed and separated to provide an effluent substantially impoverished in the aforementioned contaminants, following which the contaminant-impoverished effluent is treated in a second stage precipitation step with lime in an amount sufficient to raise and maintain the pH of the effluent at a level of at least about 10.5 to effect further precipitation of said contaminants having improved settling properties, which precipitate is separated and removed to provide a clear effluent characterized in that further precipitation of solids therein is substantially minimized or eliminated downstream from where the effluent is discharged.
REFERENCES:
patent: 3551332 (1970-12-01), Baumann
patent: 3725265 (1973-04-01), Legal
patent: 4320012 (1982-03-01), Palm et al.
Mooney et al. "Removal of F & P from H.sub.2 PO.sub.4 Wastes with 2-Stage Lime Treatment," Ind. Waste Conf. Purdue University, 1978, pp. 286-295.
Amax Inc.
Ciomek Michael A.
Hruskoci Peter
Kalil Eugene J.
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