Domestic sewage biological denitrification method and system starting method

Abstract

The invention discloses a domestic sewage biological denitrification method and a system starting method, and relates to a sewage treatment method and a system starting method. The denitrification method comprises the following steps: introducing domestic sewage into the started domestic sewage biological denitrification treatment system for denitrification treatment; wherein DO is controlled to be less than 0.5 mg / L in the denitrification operation process. The starting method comprises the following steps: 1, placing the denitrified granular sludge in a reaction zone of the EGSB reactor, introducing artificial water which is considered to be set for operation, and controlling DO to gradually increase NLR in stages; 2, introducing simulated sewage for operation until the NOB relative abundance is less than 1%; and 3, introducing actual domestic sewage to realize stable operation of the completely autotrophic nitrogen removal process. The domestic sewage biological denitrification method is low in operation cost, low in starting cost, convenient for upgrading and reconstruction of sewage plants and easier to realize. Moreover, the method disclosed by the invention is not influenced by temperature fluctuation of the domestic sewage, and also has an excellent denitrification effect at a relatively low temperature of 10-28 DEG C.

Description

technical field [0001] The invention relates to a sewage treatment method and a system starting method. Background technique [0002] For nitrogen source pollution in urban sewage, traditional biological denitrification processes based on nitrification and denitrification processes are currently used for treatment. These processes have been widely used in urban sewage treatment. However, with the improvement of wastewater discharge standards, the traditional denitrification process has also exposed its own shortcomings. For example: the infrastructure cost of multi-stage treatment system is high; the denitrification process needs to add a large amount of carbon source, which increases the operating cost of the water plant; the excess sludge output is high, which further increases the treatment cost; more greenhouses are generated in the denitrification process Gas, not conducive to sustainable development. [0003] Anammox (anammox) process means that under anaerobic condi...

AI Technical Summary

Problems solved by technology

On the one hand, the concentration range of ammonia nitrogen in domestic sewage is generally 30-50mg / L, and the concentration of ammonia nitrogen is low. Under the low concentration of ammonia nitrogen, it is difficult for free ammonia to reach the concentration level that can be suppressed, and the nitrosation process is difficult to stabilize, and the rapid proliferation of NOB will Destroy the reaction pathway of autotrophic denitrification and oxidize the NO obtained by AOB 2 - -N is directly converted to nitrate nitrogen (NO 3 - -N); on the other hand, lower temperature (10-28°C) and low substrate concentration are not conducive to the proliferation of fully autotrophic denitrification bacteria, especially AnAOB, and the overall denitrification efficiency will become worse

Therefore, it is particularly important to ensure the high efficiency and stability of AOB and AnAOB activities while also achieving effective inhibition of NOB, but the existing technology cannot achieve the above goals

[0005] At the same time, it is inevitable that a certain concentration of organic matter will remain in domestic sewage, and heterotrophic bacteria will inevitably appear in the water treatment system. More stable operation is also a problem to be solved

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