Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2007-10-09
2007-10-09
Hruskoci, Peter A. (Department: 1724)
Liquid purification or separation
Processes
Treatment by living organism
C210S616000, C210S631000, C210S640000, C210S709000, C210S716000, C210S722000, C210S724000, C210S726000, C210S912000
Reexamination Certificate
active
11224039
ABSTRACT:
Acidic metal-bearing wastewaters are treated to produce a finished water of sufficient purity to meet discharge standards while recovering metals removed in forms which are commercially valuable. The metals are selectively precipitated, either in a batch or in a continuous system, for removal of individual metal products in a specific sequence of steps from the wastewater. In each step, the pH is adjusted to the specific pH range and sulfide ion is introduced to precipitate the metals, excepting the removal of ferric iron and aluminum which is achieved using hydroxide precipitation. Bioconversion process using unique equipment converts sulfate in the wastewater to the hydrogen sulfide gas required for the precipitation process. This bioconversion process reduces the sulfate in the wastewater so that the water can be directly discharged or used for agricultural applications.
REFERENCES:
patent: 3421850 (1969-01-01), Peterson et al.
patent: 3740331 (1973-06-01), Anderson et al.
patent: 3901802 (1975-08-01), Peeters et al.
patent: 4025430 (1977-05-01), Pagel
patent: 4102784 (1978-07-01), Schlauch
patent: 4170553 (1979-10-01), Lang et al.
patent: 4200523 (1980-04-01), Balmat
patent: 4217209 (1980-08-01), Steffan et al.
patent: 4278539 (1981-07-01), Santhanam et al.
patent: 4338200 (1982-07-01), Zeijlstra
patent: 4354937 (1982-10-01), Hallberg
patent: 4422943 (1983-12-01), Fender et al.
patent: 4566975 (1986-01-01), Allgulin
patent: 4680126 (1987-07-01), Frankard et al.
patent: 5009793 (1991-04-01), Muller
patent: 5128047 (1992-07-01), Stewart et al.
patent: 5178842 (1993-01-01), Fugleberg
patent: 5505857 (1996-04-01), Misra et al.
patent: 5554290 (1996-09-01), Suthersan
patent: 5587079 (1996-12-01), Rowley et al.
patent: 5672280 (1997-09-01), Demopoulos et al.
patent: 5976378 (1999-11-01), Sumino et al.
patent: 6007712 (1999-12-01), Tanaka et al.
patent: 6139753 (2000-10-01), Taylor
patent: 6325923 (2001-12-01), Zaluski et al.
patent: 6383506 (2002-05-01), Mehta et al.
patent: 6387669 (2002-05-01), Truex et al.
patent: 6852305 (2005-02-01), Buisman et al.
patent: 08057493 (1994-08-01), None
patent: WO9508513 (1995-03-01), None
Govind, R. et al., “Treatment of Acid Mine Drainage in a Membrane Reactor”, Inorganic Memebranes, (Jul. 18-22, 2004), pp. 217-277.
Govind, R. et al., “Treatment of Acid Mine Drainage Using Membrane Bioreactors”, Proceedings of the Eighth International Conference in Inorganic Membranes, (Jul. 2004), pp. 1-8.
Tabak, H. et al., “Advances in biotreatment of acid mine drainage and biorecvoery of metals: 1. Metal precipitation for recovery and recycle”, Biodegradation, (2003), vol. 23, pp. 423-436.
Burckle John
Govind Rakesh
Kawahara Fred
Scharp Richard
Tabak Henry
Browdy & Neimark PLLC
Hruskoci Peter A.
Kornbau Anne
United States of America Enviromental Protection Agency
LandOfFree
Process for the purification of acidic metal-bearing waste... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the purification of acidic metal-bearing waste..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the purification of acidic metal-bearing waste... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3894301