专利汇可以提供Removal of nitrogen from contaminated water and its device专利检索,专利查询,专利分析的服务。并且PURPOSE: To increase nitrogen removal efficiency by treating contaminated water in a BOD oxidation tank following a treatment in a denitrification tank, then treating part of the effluent in a nitrification tank and separating the solid from the liquid of the residual effluent for separation of activated sludge.
CONSTITUTION: An untreated water which is free from coarse solid matter by separation in a sedimentation basin 1 is conducted to a denitrification tank 2, then a nitrification liquid circulated from a nitrification tank 12 is mixed with activated sludge returned from a final sedimentation basin 4 and the mixture is stirred. Thus denitrification takes place and the effluent is introduced into a BOD oxidation tank 11. Aeration is given in the presence of activated sludge in the tank 11 and the BOD remaining in water is oxidated. Then part of the effluent is sent to the bottom of the nitrification tank 12 using a pump 13. In the tank 12, ammonia nitrogen contained in the effluent from the tank 11 is nitrified to nitrite nitrogen or nitrate nitrogen by action of nitrifying bacteria. After this, the treated water flows out of the nitrification tank 12 and all of the effluent nitrified liquid is circulated back to the denitrification tank 2.
COPYRIGHT: (C)1991,JPO&Japio,下面是Removal of nitrogen from contaminated water and its device专利的具体信息内容。
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