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US 5,961,830 AGranted
Wastewater treatment method and plant
OwnerKenneth Edward Barnettinventor
Life of this patent
Estimating the term…
Abstract
A method of treating wastewater including: biologically treating wastewater under pressure; then reducing the pressure and substantially removing solids by dissolved gas flotation at the reduced pressure.
Claims26
A method of nitrifying and denitrifying wastewater under pressure comprising:
- a. directing wastewater into a pressurized aerobic zone and biologically nitrifying the wastewater under pressure so as to convert ammonia to soluble oxidized nitrogen;
- b. transferring at least a portion of the nitrified wastewater from the pressurized aerobic zone to a pressurized deoxygenation zone;
- c. deoxidizing the wastewater under pressure within the pressurized deoxygenation zone so as to substantially remove dissolved oxygen from the wastewater;
- d. transferring the deoxidized wastewater from the pressurized deoxygenation zone to a pressurized anoxic zone;
- and
- e. biologically denitrifying the wastewater in the anoxic zone under pressure by biologically converting the soluble oxidized nitrogen contained in the wastewater to gaseous nitrogen.
3 more elements
A method of nitrifying and denitrifying wastewater under pressure comprising:
- a. directing an ammonia containing stream of wastewater into a secondary treatment area;
- b. directing the wastewater into a pressurized nitrification reactor and maintaining the wastewater therein under pressure while aerating the wastewater and biologically converting ammonia to nitrate and/or nitrite;
- and
- c. directing the wastewater containing nitrate and/or nitrite to a pressurized denitrification reactor and maintaining the wastewater under pressure and anoxic conditions therein while biologically converting the nitrate and/or nitrite to a gaseous nitrogen.
1 more element
A pressurized biological wastewater treatment plant for nitrifying and denitrifying wastewater comprising:
- a. a pressurized deoxidation reactor for receiving wastewater influent and reducing the dissolved oxygen concentration within the wastewater;
- b. a pressurized anoxic reactor located downstream from the pressurized deoxidation reactor for receiving wastewater from the deoxidation reactor and biologically denitrifying the wastewater under pressure such that soluble oxidized nitrogen in the form of nitrates and/or nitrites are converted to gaseous nitrogen;
- c. a pressurized aerobic reactor located downstream from the pressurized anoxic reactor for biologically nitrifying wastewater under pressure such that ammonia contained within the wastewater is converted to soluble oxidized nitrogen in the form of nitrates and/or nitrites;
- and
- d. a return line leading from the pressurized nitrification reactor for routing a selected amount of nitrified wastewater to the deoxidation reactor.
2 more elements
Dependencies are inferred from the claim text.