1
John Piccirillo, John A Meidl: Multiple zone batch treatment process. Zimpro Passavant Environmental Systems, Tipton L Randall, March 9, 1993: US05192442 (89 worldwide citation)

A process is described for the operation of a multiple zone batch treatment system for biological or biophysical treatment of wastewater. The system comprises two or more batch treatment zones with wastewater passing sequentially through all treatment zones. After the mix and settle batch steps occu ...


2
William M Copa, Richard W Lehmann: Two-stage subcritical-supercritical wet oxidation. Zimpro Passavant Environmental Systems, Tipton L Randall, August 31, 1993: US05240619 (57 worldwide citation)

A two-stage wet oxidation process for COD removal from high strength wastewater is disclosed. The wastewater stream is treated in a first stage subcritical wet oxidation zone at temperatures between about 250.degree. and 374.degree. C. to remove a substantial portion of the COD. Subsequently, all or ...


3
Richard W Lehmann: Process for treatment of wastewater containing inorganic ammonium salts. Zimpro Passavant Environmental Systems, Michael Best & Friedrich, February 2, 1993: US05183577 (55 worldwide citation)

A process for treating an aqueous wastewater containing ammonium compounds. The process comprises the steps of preheating a liquid influent and introducing the preheated influent, an oxygen-containing gas an the wastewater into a reaction vessel for undergoing wet oxidation. An oxidized effluent is ...


4
Gene W Mueller, Bruce L Brandenburg: Method for starting up and controlling operating temperature of a wet oxidation process. Zimpro Passavant Environmental Systems, Michael Best and Friedrich, October 15, 1991: US05057231 (34 worldwide citation)

A method for starting up and controlling the temperature of a wet oxidation process in which a heat exchanger employing superheated steam is used to initially heat a waste stream introduced into a wet oxidation reaction vessel for start up and then to subsequently adjust the temperature of the waste ...


5
Glover C McIntyre, Robert J Lacombe, Russell G Forbess: Furnace combustion zone temperature control method. Zimpro Passavant Environmental Systems, Tipton L Randall, May 28, 1991: US05018458 (31 worldwide citation)

An improved method for controlling combustion zone temperature in a furnace independent of flue gas oxygen content is disclosed. The method comprises supplying a carrier gas containing a fine mist of liquid water droplets to the furnace combustion zone to control the maximum temperature within the c ...


6
David A Beula, Joseph A Momont, William M Copa: Caustic sulfide wet oxidation process. Zimpro Passavant Environmental Systems, Tipton L Randall, January 21, 1992: US05082571 (27 worldwide citation)

A process for treatment of caustic sulfide liquor by wet oxidation in a nickel-based alloy system is described. The liquor is first analyzed for alkalinity consuming species and for nonsulfidic alkalinity. If excess alkalinity consuming species is present compared to nonsulfidic alkalinity, then add ...


7
Mark A Clark, David A Beula: Corrosion control for wet oxidation systems. Zimpro Passavant Environmental Systems, Tipton L Randall, July 27, 1993: US05230810 (21 worldwide citation)

A process for controlling corrosion in a wet oxidation system by controlling the operating pH range within the system is described. A pH operating range is selected within which corrosion to the wet oxidation system is minimized. The pH within the wet oxidation system is monitored and a pH adjusting ...


8
Richard W Lehmann, Bruce L Brandenburg: Wet oxidation of ammonium salt containing liquors. Zimpro Passavant Environmental Systems, Tipton L Randall, November 16, 1993: US05262060 (13 worldwide citation)

This is a process for wet oxidation of an ammonium salt containing waste liquor which prevents plugging of the vapor-carrying lines of the wet oxidation system. The vapor-carrying lines are maintained in an unobstructed condition by adding sufficient liquid water to dissolve condensed ammonium salt ...


9
Robert J Kamke: Method for color removal from thermally conditioned sludge liquors. Zimpro Passavant Environmental Systems, Tipton L Randall, December 24, 1991: US05075015 (12 worldwide citation)

A process for removing color and oxidizable organic matter from thermally conditioned sludge liquor is disclosed. The process comprises treating the liquor with 250 to 430 mg/l chlorine which removes 20 to 70 percent of the color and produces a chlorine residual in the liquor. The chlorine-treated l ...


10
David S Ross: Underdrain for granular medium filter. Zimpro Passavant Environmental Systems, Tipton L Randall, February 18, 1992: US05089147 (10 worldwide citation)

An improved apparatus and method for operating a granular medium filter is disclosed. The apparatus comprises an improved underdrain structure made up of a plurality of rectangular compartments which allows the filter bed to be "air pulsed" as well as backwashed for thorough cleaning of the bed. Noz ...