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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Chowdhury; Ajit K.
Address:
Madison, WI
No. of patents:
10
Patents:












Patent Number Title Of Patent Date Issued
7560034 Caustic solution treatment process July 14, 2009
A method for treating a spent caustic solution having a pH greater than about 10.5 includes the steps of (a) lowering the pH of the caustic solution into the range of between about 10 to 10.5 to produce a pH-modified caustic solution; (b) oxidizing the pH-modified caustic solution un
7497948 Method for remediation of soil and groundwater March 3, 2009
A system and method to treat a site includes oxygenating or ozonating the site, adding nutrients, and maintaining a low bio-chemical-oxygen-demand-to-total-kjeldahl-nitrogen (BOD5:TKN) ratio. Furthermore, the system and method maintain conditions effective to permit aerobic biologica
7374367 Methods for stabilizing heavy metal containing material for disposal in saturated zone May 20, 2008
A leaching-stabilized heavy metal-contaminated matrix can be stored in a subsurface saturated zone by contacting the matrix with an amount of an agent for increasing acid-neutralization capacity sufficient to provide the stored matrix a preselected permanence level.
7351191 Method for stabilizing contaminated waste April 1, 2008
A method for solidifying an oil-contaminated aqueous waste in situ or ex situ includes the step of combining the oil-contaminated waste with a clay, a cement and a sulfite salt solidification agent to form a solidified waste matrix, wherein the solidification agent undergoes hydratio
7005076 Caustic solution treatment process February 28, 2006
A method for treating a spent caustic solution having a pH greater than about 10.5 includes the steps of (a) lowering the pH of the caustic solution into the range of between about 10 to 10.5 to produce a pH-modified caustic solution; (b) oxidizing the pH-modified caustic solution un
6949197 Situ neutralization of subsurface acidic pore water September 27, 2005
A method for neutralizing in situ pore water associated with a subsurface waste material body, the pore water having a pH of less than 2, the method includes the steps of adding a non-carbonate alkali to the pore water to produce a pH-modified acidic pore water having a pH between about
6607474 Method for stabilizing chromium-contaminated materials August 19, 2003
A method for stabilizing chromium in a chromium-contaminated waste matrix characterized by high concentrations of alkaline material (such as lime) includes the steps of contacting a source of hexavalent chromium with a source of ferrous ions to produce ferric ions; oxidizing iron pyrite
6543964 Stabilization of arsenic-contaminated materials April 8, 2003
A method for stabilizing arsenic in a waste matrix includes the steps of combining with the waste matrix an agent for controlling the oxidation-reduction potential of the matrix, an agent for controlling the pH of the matrix and an agent for adsorbing or coprecipitating the arsenic i
6254312 Stabilization of arsenic-contaminated materials July 3, 2001
A method for stabilizing arsenic in a waste matrix includes the steps of combining with the waste matrix an agent for controlling the oxidation-reduction potential of the matrix, an agent for controlling the pH of the matrix and an agent for adsorbing or coprecipitating the arsenic i
5202033 In situ method for decreasing heavy metal leaching from soil or waste April 13, 1993
A method of treating solid waste in soil or solid disposed waste containing unacceptable levels of leachable metals, such as lead, cadmium, arsenic, zinc, copper and chromium, includes mixing the solid waste or soil in place with a phosphate source or a carbonate source or ferrous sulfat










 
 
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