Patents
Southern Water Treatment, Inc.
U.S. Patent 7,001,583
Essentially insoluble heavy metal sulfide slurry for wastewater treatment
A product and method for the removal of pollutant heavy metals from aqueous solutions which precludes the end user from storing, handling, feeding and controlling hazardous soluble sulfide materials. The product is a slurry which includes a mixture of a liquid medium and an essentially insoluble salt wherein the salt is the reaction product of heavy metal ions, preferably selected from Mn.sup.++ ions, Fe.sup.++ ions, and Fe.sup.+++ ions, and sulfide ions derived from soluble sulfide sources such as sodium sulfide, hydrogen sulfide, and sodium hydrosulfide. Addition of the subject slurry to a wastewater stream will effect the precipitation of heavy metals with lesser equilibrium sulfide ion concentrations than that of the essentially insoluble salt. Solids collected by this method may be returned to subsequent wastewater streams for additional removal of heavy metals by any excess heavy metal sulfide salt.
U.S. Patent 6,897,817
Essentially insoluble heavy metal sulfide slurry for wastewater treatment
A product and method for the removal of pollutant heavy metals from aqueous solutions which precludes the end user from storing, handling, feeding and controlling hazardous soluble sulfide materials. The product is a slurry which includes a mixture of a liquid medium and an essentially insoluble salt wherein the salt is the reaction product of heavy metal ions, preferably selected from Mn.sup.++ ions, Fe.sup.++ ions, and Fe.sup.+++ ions, and sulfide ions derived from soluble sulfide sources such as sodium sulfide, hydrogen sulfide, and sodium hydrosulfide. Addition of the subject slurry to a wastewater stream will effect the precipitation of heavy metals with lesser equilibrium sulfide ion concentrations than that of the essentially insoluble salt. Solids collected by this method may be returned to subsequent wastewater streams for additional removal of heavy metals by any excess heavy metal sulfide salt.
U.S. Patent 4,999,116
Waste Water Treatment Method
A method of Waste Water treatment, comprising:
conducting pH treatment, of a controlled body of waste water for substantially precipitating non-chelated and non-complexed metals therefrom; sampling such pH treated waste water, and substantially removing solid precipitated metals therefrom to provide a clear sample; testing such clear sample for the presence of any remaining metals in solution therein; and feeding a given precipitating agent to the controlled body of waste water in response to the presence of such remaining metals so as to substantially precipitate same, whereby both pH-precipitated and non-pH-precipitated metals are substantially precipitated from such body of waste water fro removal therefrom, with minimized feeding of said precipitating agent.
U.S. Patent 4,923,599
Waste Water Treatment Apparatus
Apparatus for Waste Water treatment, comprising:
pH treatment means for conducting pH treatment of a controlled body of waste water for substantially precipitating non-chelated and non-complexed metals therefrom; sampling means for sampling said pH treated waste water; separation means for substantially removing solid precipitated metals from said sampled pH treated waste water to provide a clear sample; testing means for testing said clear sample for the presence of any remaining metals in solution therein; and feeding means for feeding a given precipitating agent to the controlled body of waste water in response to the presence of said remaining metals so as to substantially precipitate same.
U.S. Patent 6,896,817
Essentially insoluble heavy metal sulfide slurry for wastewater treatment
A product and method for the removal of pollutant heavy metals from aqueous solutions which precludes the end user from storing, handling, feeding and controlling hazardous soluble sulfide materials. The product is a slurry which includes a mixture of a liquid medium and an essentially insoluble salt wherein the salt is the reaction product of heavy metal ions, preferably selected from Mn.sup.++ ions, Fe.sup.++ ions, and Fe.sup.+++ ions, and sulfide ions derived from soluble sulfide sources such as sodium sulfide, hydrogen sulfide, and sodium hydrosulfide. Addition of the subject slurry to a wastewater stream will effect the precipitation of heavy metals with lesser equilibrium sulfide ion concentrations than that of the essentially insoluble salt. Solids collected by this method may be returned to subsequent wastewater streams for additional removal of heavy metals by any excess heavy metal sulfide salt.
