Two-stage short-cut nitrification and anaerobic ammonia oxidation coupled endogenous denitrification deep denitrification device and method thereof

[0036] Such as figure 1 As shown, the two-stage short-path nitrification and anaerobic ammonium oxidation coupled endogenous denitrification deep denitrification device provided in this example includes a raw water tank 1, a PN (short-path nitrification) reactor 2, an intermediate water tank 3 and a SAED (anaerobic ammonium oxidation) reactor. Oxyammonium oxidation coupling endogenous denitrification) reactor 4.

[0037] Among them, the raw water of urban sewage is stored in the raw water tank 1, and the PN reactor 2 is connected with the raw water tank 1 through the PN inlet pump 2.1 to obtain the raw water of urban sewage in the raw water tank 1. The PN reactor 2 adopts the PN outlet valve 2.13 and the intermediate The water tank 3 is connected, and is used to inject the short-range nitrification liquid obtained after the two-stage short-range nitrification treatment into the intermediate water tank 3 .

[0038] It should be noted that, in this embodiment, the water in and out

[0049] This embodiment provides a deep denitrification method of two-stage short-cut nitrification and anammox combined with endogenous denitrification, which is completed based on the device described in any of the above embodiments.

[0050] Specifically, the deep denitrification method of two-stage short-range nitrification and anammox combined with endogenous denitrification in this embodiment includes the following steps:

[0051] 1) Inoculation start-up stage: inoculate short-range nitrification sludge in PN reactor 2, control the sludge concentration to 3000-4000mg / L, add urban sewage raw water for aerobic aeration, adopt sequence batch mode operation, real-time detection is good The concentration of dissolved oxygen DO in PN reactor 2 in the oxygen stage, when the DO concentration curve of dissolved oxygen jumps, stop the aeration, control the DO concentration of dissolved oxygen to 0.5-1.0mg / L, and the sludge retention time SRT to 15-20d , the drainage ratio is 60-70