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Title: Method of removing heavy metals from industrial waste streams

Abstract: Heavy Metals contained in industrial waste streams are removed therefrom by flocculation using a source of ferric ions and an alkaline material at a basic pH. Both the flocculated heavy metals and the coagulant chemicals are recovered by acidifying the floc to a pH of between 3.2 and 3.7. This liberates the heavy metals back into solution but does not destroy the floc particles. After separation and removal of the concentrated heavy metal solution, the floc is further acidified to completely dissolve it. This dissolved ferric ion containing solution may then be reused to treat succeeding portions of heavy metal containing waste streams. The concentrated heavy metals solution may also be recycled or the metals contained therein recovered for reuse or disposed of in an acceptable manner.


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Inventors: Etzel, James E. (West Lafayette, IN)
Anand, Praveen (West Lafayette, IN)

Application Number: 06/174987
Filing Date: 1980-08-04
Publication_date: 1982-08-10
Assignee: PURDUE RESEARCH FOUNDATION

Primary Class(es): 210/667 423/140, 210/717, 210/711, 210/913, 210/912, 210/724,
Other Classes: C02F1/52; C02F9/00; C02F1/52
US Patent Ref:
2128569August, 1938Velz210/711Treatment of water and sewage
3347786October, 1967Baer et al.210/708Process for purifying water using reforming of metal hydroxide flocculation agent
3494864February, 1970Willihnqanz210/708WATER PURIFICATION PROCESS
3725266April, 1973Haviland210/710PROCESS FOR REMOVING METAL COMPOUND CONTAMINANTS FROM WASTE WATER
3800024March, 1974Forsell et al.210/710PROCESS FOR NEUTRALIZATION AND REGENERATION OF AQUEOUS SOLUTIONS OF ACIDS AND DISSOLVED METALS
4040955August, 1977Davidson210/708Method of treating wastewater containing emulsified oils
4163716August, 1979Turnbull210/665Process for the purification of contaminated water
4210530July, 1980Etzel et al.210/904Treatment of metal plating wastes with an unexpanded vermiculite cation exchange column
4222872September, 1980Ramirez210/688Reclamation of molybdenum or other heavy metals from wastewater treatment skimmings

Other Refs: JP51-62182JP55-107742
May, 1976210/710
August, 198075/108
Other References: Anand, "Eval. of a Chem. Coagulation & Coagulant Reuse Process for Treating Heavy Metal Waste," Purdue University, Thesis, Apr. 27, 1979.

Primary Examiner: Hruskoci, Peter A.
Assistant Examiner:
Attorney: Biebel, French & Nauman
Claims:
Wha