Autotrophic/heterotrophic denitrification-based integrated nitrogen removal apparatus and nitrogen removal method thereof

Abstract

The invention discloses an autotrophic / heterotrophic denitrification-based integrated nitrogen removal apparatus and method, and belongs to the technical field of water treatment. A main reaction device is divided into an autotrophic denitrification area, a heterotrophic denitrification area and a buffer cavity. The device is provided with a liquid inlet, a liquid outlet and a gas outlet, and the liquid inlet is connected with the autotrophic denitrification area; the liquid outlet and the gas outlet are connected with the heterotrophic denitrification area; the device keeps the autotrophic denitrification area and the heterotrophic denitrification area mutually independent through the buffer cavity, and a micro-electrolysis filler layer and a sulfur / limestone filler layer are arranged in the autotrophic denitrification area; and a biomass vinasse layer is arranged in the heterotrophic denitrification area to improve the C / N ratio of wastewater and promote the heterotrophic denitrification nitrogen removal process. A solid-phase autotrophic denitrification coupled heterotrophic denitrification technology is adopted to remove nitrogen from the wastewater, so compared with routine single nitrogen removal technologies based on heterotrophic denitrification, the method disclosed in the invention has the advantages of high nitrogen removal efficiency, low cost and stable quality of outlet water.

Description

technical field [0001] The invention relates to the technical field of water treatment technology, in particular to an integrated denitrification device based on autotrophic / heterotrophic denitrification and a denitrification method thereof. Background technique [0002] At present, the quality of the secondary biochemical effluent of sewage treatment in my country is difficult to meet the first-level A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), especially for total nitrogen, which requires deep removal of nitrate in the effluent. Biological denitrification is a cost-effective method for nitrate removal, however, the lack of carbon source in the secondary effluent leads to low denitrification efficiency. Supplementing conventional carbon sources is not only costly, but also sometimes leads to unstable water quality. Therefore, it is particularly important to develop high-efficiency, low-consumption biological denitrifica...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the low efficiency of biological denitrification caused by the lack of carbon source in the secondary biochemical effluent in the existing technical center, and the high cost and poor quality of the effluent caused by the need to supplement conventional carbon sources. To solve the problem of stability, provide an integrated denitrification device for autotrophic / heterotrophic denitrification and its denitrification method

Images