Device and method for deep denitrification of nitrate wastewater and urban sewage by partial denitrification in series with autotrophic denitrification

Abstract

The invention provides a device and method for realizing deep denitrification of nitrate wastewater and municipal sewage by partial denitrification and serial autotrophic nitrogen removal. The device comprises a nitrate wastewater tank, a municipal sewage tank, a partial denitrification reactor, an additional carbon resource reserve tank, a first intermediate water tank, an anaerobic ammonia oxidation reactor and a second intermediate water tank. The method comprises the following steps that nitrate wastewater and municipal sewage flow into the partial denitrification reactor according to a ratio, an effluent obtained after nitrate is reduced to nitrite flows into the anaerobic ammonia oxidation reactor to be subjected to an anaerobic ammonia oxidation reaction, and the effluent contains the nitrate generated by anaerobic ammonia oxidation, and then flows into the partial denitrification reactor to be subjected to partial denitrification to generate the nitrite; the effluent is pumped into the anaerobic ammonia nitrogen reactor again to be subjected to the anaerobic ammonia oxidation reaction with residual ammonia nitrogen in the reactor and is then removed. The device and method have the advantages of improving the system nitrogen removal efficiency and improving the effluent quality, the effluent meets the emission standard, and the deep nitrogen removal can be realized.

Description

technical field [0001] The invention relates to a device and method for partial denitrification in series with autotrophic denitrification to realize deep denitrification of nitrate wastewater and urban sewage, belonging to the technical field of sewage biological treatment, specifically, nitrate wastewater and urban sewage enter partial denitrification in proportion Reactor, reducing nitrate to nitrite, the effluent enters the anammox reactor for anammox reaction, the effluent contains nitrate produced by anammox, and then enters the partial denitrification reactor to use external carbon The source is partially denitrified, and the effluent is then returned to the anammox reactor to remove the remaining ammonia nitrogen through anaerobic ammonium oxidation reaction to achieve deep denitrification. Background technique [0002] In the past 20 years, the degree of eutrophication of lakes in my country has become increasingly serious, which not only affects the quality of drin...

AI Technical Summary

Problems solved by technology

However, there are certain limitations in the application of this process: Anaerobic ammonium oxidation uses nitrite as the substrate, and short-range nitrification needs to be realized first.

However, short-cut nitrification can be achieved relatively volumetrically under conditions of high temperature and high ammonia nitrogen, but it is not easy to realize the urban sewage with low carbon and nitrogen, and the nitrite accumulation rate is difficult to maintain stable, which also limits its application range.

On the other hand, the anaerobic ammonium oxidation process will produce nitrate nitrogen, that is, the effluent must contain some nitrate, especially the effluent of high ammonia nitrogen wastewater, which needs to be supplemented after treatment to ensure that the total nitrogen of the effluent meets the standard; if the short-range nitrification process nitrite The low salt accumulation rate will also bring nitrate into the anammox reactor, affecting the total nitrogen removal effect

The influent process will carry part of the dissolved oxygen, resulting in a certain degree of nitrification reaction in the anammox reactor to generate nitrate, which will eventually lead to excessive nitrate in the effluent, which needs further treatment before it can be discharged.

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