Process and equipment for treating ammonium containing liquid
AssigneeHitachi Plant Engineering & Construction Co., Ltd.
InventorsTatsuo Sumino, Kazuichi Isaka
Life of this patent
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Abstract
The process for treating an ammonium containing liquid by denitrification treatment of an ammonium containing liquid containing at least ammonium comprises carrying out nitrate reduction treatment of reducing nitrate contained in or added to the ammonium containing liquid to nitrite, and carrying out anaerobic ammonium oxidation treatment of simultaneously anaerobically denitrifying nitrite produced in the nitrate reduction treatment and ammonium contained in the ammonium containing liquid by anaerobic ammonium oxidizing bacteria.
Claims15
Equipment for treating an ammonium containing liquid by anaerobically biologically denitrifying ammonium in the ammonium containing liquid, the equipment comprising:
- an anaerobic ammonium oxidation tank in which heterotrophic denitrifying bacteria and anaerobic ammonium oxidizing bacteria are present,
- an inflow section of allowing the ammonium containing liquid to flow into the anaerobic ammonium oxidation tank,
- a discharge section of discharging the liquid treated in the anaerobic ammonium oxidation tank,
- a nitrate storage tank of storing a certain concentration of nitrate,
- a nitrate addition device of adding nitrate to the anaerobic ammonium oxidation tank from the nitrate storage tank, and
- a nitrate addition amount control device of controlling the amount of the nitrate added.
Equipment for treating an ammonium containing liquid by biologically denitrifying ammonium in the ammonium containing liquid, the equipment comprising:
- a nitrification tank of nitrifying ammonium in the ammonium containing liquid into nitrate by nitrifying bacteria, and
- an anaerobic ammonium oxidation tank of carrying out nitrate reduction treatment of reducing nitrate obtained in the nitrification tank to nitrite by heterotrophic denitrifying bacteria using an organic substance in the ammonium containing liquid as a hydrogen donor, and of simultaneously denitrifying nitrite produced by the nitrate reduction treatment and ammonium in the ammonium containing liquid by anaerobic ammonium oxidizing bacteria.
Equipment for treating an ammonium containing liquid by biologically denitrifying ammonium in the ammonium containing liquid, the equipment comprising:
- a nitrification tank of primarily separating the ammonium containing liquid into two separated ammonium containing liquids, and nitrifying ammonium in one of the separated ammonium containing liquids to nitrate by nitrifying bacteria;
- a denitrification tank of further secondarily separating the nitrified liquid obtained in the nitrification tank into two separated nitrified liquids, mixing one of the separated nitrified liquids with the other primarily separated ammonium containing liquid, and carrying out denitrification treatment of nitrate in the separated nitrified liquid by denitrifying bacteria using an organic substance in the separated ammonium containing liquid as a hydrogen donor;
- and
- an anaerobic ammonium oxidation tank of mixing the other secondarily separated nitrified liquid with the denitrified liquid from the denitrification tank and carrying out nitrate reduction treatment of reducing nitrate contained in the separated nitrified liquid to nitrite by heterotrophic denitrifying bacteria using an organic substance in the denitrified liquid as a hydrogen donor, and of simultaneously denitrifying nitrite produced by the nitrate reduction treatment and ammonium in the denitrified liquid by anaerobic ammonium oxidizing bacteria.
Dependencies are inferred from the claim text.