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US 6,387,254 B1Granted
Apparatus for wastewater treatment
AssigneeNKK Corporation
InventorsTatsuo Takechi, Masahisa Tanabe, Toshiaki Tsubone, Jun Miyata, Kei Baba, Satoru Udagawa, Shinichi Endo
Life of this patent
Estimating the term…
Abstract
Phosphorus in wastewater is removed by using an apparatus including a settling tank, an anaerobic tank, an aerobic tank, and a final settling tank. Nitrogen in wastewater is removed by using an apparatus including a settling tank, an anaerobic tank, a nitrification tank, and a final settling tank.
Claims15
A wastewater treatment apparatus comprising:
- a primary settling means for removing solids contained in wastewater to produce a first treated effluent and a sediment;
- a denitrification means, into which the first treated effluent from the primary settling means is introduced, for reducing nitrate nitrogen or nitrite nitrogen in the first treated effluent to nitrogen gas to produce a second treated effluent;
- a nitrification means, into which the second treated effluent from the denitrification means is introduced, for oxidizing nitrogen compounds in the second treated effluent to nitrate nitrogen or nitrite nitrogen to produce a third treated effluent;
- a final settling means, into which the third treated effluent is introduced, for settling the third treated effluent from the nitrification means to produce a final treated effluent and an activated sludge;
- and
- a returning means comprising a third treated effluent returning means for returning a portion of the third treated effluent to the primary settling means.
3 more elements
A wastewater treatment apparatus comprising:
- a primary settling means for removing solids contained in wastewater to produce a first treated effluent and a sediment;
- a denitrification means, into which the first treated effluent from the primary settling means is introduced, for reducing nitrate nitrogen or nitrite nitrogen in the first treated effluent to nitrogen gas to produce a second treated effluent;
- a nitrification means, into which the second treated effluent from the denitrification means is introduced, for oxidizing nitrogen compounds in the second treated effluent to nitrate nitrogen or nitrite nitrogen to produce a third treated effluent;
- a final settling means, into which the third treated effluent is introduced, for settling the third treated effluent from the nitrification means to produce a final treated effluent and an activated sludge;
- and
- a returning means comprising a final treated effluent returning means for returning a portion of the final treated effluent to the primary settling means.
3 more elements
A wastewater treatment apparatus comprising:
- a primary settling means for removing solids contained in wastewater to produce a first treated effluent and a sediment;
- a denitrification means, into which the first treated effluent from the primary settling means is introduced, for reducing nitrate nitrogen or nitrite nitrogen in the first treated effluent to nitrogen gas to produce a second treated effluent;
- a nitrification means, into which the second treated effluent from the denitrification means is introduced, for oxidizing nitrogen compounds in the second treated effluent to nitrate nitrogen or nitrite nitrogen to produce a third treated effluent;
- a final settling means, into which the third treated effluent is introduced, for settling the third treated effluent from the nitrification means to produce a final treated effluent and an activated sludge;
- and
- a returning means comprising a third treated effluent returning means for returning a portion of the third treated effluent to the primary settling means and a final treated effluent returning means for returning a portion of the final treated effluent to the primary settling means.
3 more elements
Dependencies are inferred from the claim text.