KR970065444A - Development of Advanced Step Aeration System for Nitrogen Removal - Google Patents

Abstract

The invention of the present application is a system development in the field of environmental technology, especially in the field of advanced sewage treatment technology.

The standard activated sludge method, which has most of the existing sewage treatment methods, does not remove nutrients such as nitrogen and phosphorus, and thus can not improve the water quality environment due to algae or coastal red tide due to eutrophication of rivers.

The present invention system can not only simplify such a problem of the conventional activated sludge process but also contribute to a new system. In addition to the removal of nitrogen and phosphorus as well as the removal of nitrogen and phosphorus, the removal rate of BOD and SS is much higher than that of conventional methods. Therefore, it is possible to improve the sewage treatment field and water environment in Korea in terms of technology, economy and practicality. .

Description

Development of Advanced Step Aeration System for Removing Nitrogen and Phosphorus

Since this is a trivial issue, I did not include the contents of the text.

The advanced step aeration system, which is capable of biological denitrification and detoxification by complementing existing activated sludge facilities, is composed of a bioreactor (1,2,3,4) divided into anaerobic, anaerobic, anoxic, (5), and a sludge tank (6). The inflow sewage flows into the anaerobic tank (1). In the anaerobic tank 1, the outflow and denitrification are performed, and the effluent flows into the first aeration tank 2, which is the next process. In the first anoxic tank 2, the ammonia is oxidized to nitric acid by the nitrification reaction, and at the same time, BOD removal and excessive intake are performed. In the next anoxic tank 3, the soluble organic matter in the inflow sewage introduced into the step is removed Carbon Source) and denitrification reaction in which nitric acid due to the nitrification action is reduced to nitrogen gas in the first aquarium tank 2 is performed. In the second aeration tank (4), which is the final aeration tank, the anaerobic condition of the final sedimentation tank is prevented by aeration for a short period of time to prevent re-emission of phosphorus and to decompose and nitrify organic matter. The effluent of the second aquarium 4 flows into the sedimentation unit 5 to perform solid-liquid separation, the supernatant is discharged to the final treated water, and the precipitated sludge is sent to the sludge tank 6 through the return line. The sludge tank 6 takes the sludge withdrawn from the final sedimentation basin 5 for a residence time of about 2 hours (when the recycle rate is 30%), returns it to the bioreactor 1, and part of it is discharged to the surplus sludge. The sludge tank 6 is agitated by a stirring device or a disk diffuser.

Claims (1)

(1, 2, 3 and 4), a sedimentation tank (5), and a sludge tank (6) through which the sedimentation sludge is sent through the return line, Adveanced Step Aeration System. ※ Note: It is disclosed by the contents of the first application.