Integrated denitrification reaction device and process method based on autotrophic denitrification

Abstract

The invention discloses an autotrophic denitrification based integrated novel denitrification reaction device and a technological process thereof, belonging to the technical field of water pollution control. The device comprises a reactor main body, a water feeding system, a water draining system, a sludge removal system, and an aeration and oxygen-limiting system, wherein the reactor main body is concentric cylinder-shaped, an inner ring is an aerobic reaction area, an outer ring is a middle precipitation area and an autotrophic denitrification area, and the inner side walls of the middle precipitation area and the autotrophic denitrification area of the outer ring are the outer side wall of the aerobic reaction area of the inner ring; a porous carrier bearing plate is arranged in the aerobic reaction area, and an organic biofilm carrier is filled in the porous carrier bearing plate; and a porous carrier bearing plate is arranged in the autotrophic denitrification area, and a micro-electrolysis carrier is filled in the porous carrier bearing plate. According to the invention, when the carbon nitrogen ratio of sewage is relatively low, an organic carbon source is not required to be additionally added, so that compared with traditional autotrophic denitrification based denitrification processes, the device disclosed by the invention can control the concentration of organic matters in drained water better, and can be used for saving the operating cost produced by the addition of the organic carbon source.

Description

technical field [0001] The invention relates to an integrated denitrification reaction device and a process method based on autotrophic denitrification, and belongs to the technical field of water pollution control. Background technique [0002] Nitrogen pollutants are one of the important causes of water eutrophication, and the control of nitrogen pollution is a water environment problem that needs to be solved urgently in my country and even in the world. [0003] The nitrogen pollutants in domestic sewage, polluted surface water and other polluted water bodies are mainly ammonia nitrogen and nitrate. The basic principle of conventional biological denitrification treatment method is: ammonia nitrogen is oxidized to sub Nitrate is then oxidized to nitrate under the action of nitrite oxidizing bacteria (NOB); nitrate is reduced to nitrogen gas and discharged from the water body under the action of denitrifying bacteria, thereby completely denitrifying. Generally, heterotrop...

AI Technical Summary

Problems solved by technology

The denitrification process based on the autotrophic denitrification process does not require the addition of organic carbon sources and produces less sludge, so it has a good application prospect. However, it is rarely developed and applied at present.

One of the key issues is the source of electron donors for autotrophic denitrifying bacteria. If hydrogen, sulfide, etc. are added, improper control will introduce new problems (such as hydrogen is flammable and explosive, sulfide introduces pollution, etc.)

There are few reports on the water treatment process that uses the electron transfer generated by the micro-electrolysis carrier itself to provide electron donors for autotrophic denitrifying bacteria, and then realize denitrification.

Images