Method and apparatus for treating ammonium-containing liquid
AssigneeHitachi Plant Technologies, Ltd.
InventorsTasuo Sumino, Kazuichi Isaka
Life of this patent
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Abstract
The method for treating an ammonium-containing liquid which biologically denitrifies ammonium contained in the ammonium-containing liquid in an anaerobic atmosphere, the method comprises the steps of: bringing the ammonium-containing liquid into contact with anaerobic bacteria in a biological treatment tank, the anaerobic bacteria having an ability to biologically denitrify the ammonium in the anaerobic atmosphere; and adding nitrite to the biological treatment tank from a nitrite storage tank concurrently with the bringing step, the nitrite storage tank storing the nitrite with a certain concentration.
Claims16
A method for treating an ammonium-containing liquid which biologically denitrifies ammonium contained in the ammonium-containing liquid in an anaerobic atmosphere, the method comprising the steps of:
- bringing the ammonium-containing liquid into contact with anaerobic bacteria in a biological treatment tank, the anaerobic bacteria having an ability to biologically denitrify the ammonium in the anaerobic atmosphere;
- and
- adding nitrite to the biological treatment tank from a nitrite storage tank concurrently with the bringing step, the nitrite storage tank storing the nitrite with a certain concentration;
- wherein the nitrite is added from the nitrite storage tank to a plurality of places which are variously located in the biological treatment tank so that a highest concentration of nitrite nitrogen is lower than 80 mg/L in the biological treatment tank.
An apparatus for treating an ammonium-containing liquid which denitrifies ammonium contained in the ammonium-containing liquid biologically in an anaerobic atmosphere, the apparatus comprising:
- a biological treatment tank which includes anaerobic bacteria having an ability to denitrify the ammonium biologically in the anaerobic atmosphere;
- an inflow section which allows the ammonium-containing liquid to flow into the biological treatment tank;
- a discharge section which discharges the liquid treated in the biological treatment tank;
- a nitrite storage tank which stores nitrite with a certain concentration;
- an addition device which adds the nitrite to the biological treatment tank from the nitrite storage tank;
- and
- an addition amount control device which controlling an amount of the nitrite added by the addition device;
- wherein:
- the biological treatment tank has a removable cartridge structure;
- a plurality of connection sections are provided respectively in the inflow section, the discharge section, and the addition device;
- and
- the biological treatment tank is connected via the connection sections to the inflow section, the discharge section, and the addition device.
An apparatus for treating an ammonium-containing liquid which denitrifies ammonium contained in the ammonium-containing liquid biologically in an anaerobic atmosphere, the apparatus comprising:
- a plurality of biological treatment tanks which include anaerobic bacteria having an ability to denitrify the ammonium biologically in the anaerobic atmosphere;
- a plurality of inflow sections which allow the ammonium-containing liquid to flow into the biological treatment tanks;
- a plurality of discharge sections which discharge the liquid treated in the biological treatment tanks;
- a nitrite storage tank which stores nitrite with a certain concentration;
- a plurality of addition devices which add the nitrite to the biological treatment tanks from the nitrite storage tank;
- and an addition amount control device which controlling an amount of the nitrite added by the addition devices, wherein:
- each of the biological treatment tanks has a removable cartridge structure;
- a plurality of connection sections are provided respectively in the inflow sections, the discharge sections, and the addition devices;
- and
- the biological treatment tanks are connected via the connection sections to the inflow sections, the discharge sections, and the addition devices.
An apparatus for treating an ammonium-containing liquid which denitrifies ammonium contained in the ammonium-containing liquid biologically in an anaerobic atmosphere, the apparatus comprising:
- a biological treatment tank which includes anaerobic bacteria having an ability to denitrify the ammonium biologically in the anaerobic atmosphere;
- an inflow section which allows the ammonium-containing liquid to flow into the biological treatment tank;
- a discharge section which discharges the liquid treated in the biological treatment tank;
- a nitrite storage tank which stores nitrite with a certain concentration;
- an addition device which adds the nitrite to the biological treatment tank from the nitrite storage tank;
- an addition amount control device which controlling an amount of the nitrite added by the addition device;
- and
- a gas production rate measurement device which measures a production rate (L/min) of nitrogen gas produced in the biological treatment tank when changing the amount of the nitrite added by the addition device,
- wherein the addition amount control device controls the added amount of the nitrite according to variations in the production rate measured by the gas production rate measurement device.
Dependencies are inferred from the claim text.