Method and device for short-cut nitrification of sewage

Abstract

The invention provides a method and a device for short-cut nitrification of sewage. The method for short-cut nitrification comprises the following steps: providing the sewage; carrying out aeration and stirring on the sewage to obtain treated sewage; and discharging a part of the treated dirt, carrying out a precipitation step on the remaining part of the treated sewage, and filtering out water after layering, wherein the DO value in the sewage is controlled between 0.20 mg / L and 0.80 mg / L, and the pH value and the pH change rate are used as the basis for judging the ending time point of the aeration step. The short-cut nitrification method disclosed by the invention is simple and convenient to operate, low in cost, low in energy consumption and high in reliability, and is more favorable for realizing regional circulation of resources and energy.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a method and device for short-range nitrification of sewage. Background technique [0002] In recent years, with the popularization of the concept of sustainable development, the purification of sewage, such as municipal sewage and domestic sewage, has attracted the attention of many scientific researchers. Currently, the short-cut nitrification / anammox process (PN / Anammox) is considered to be the most promising biological denitrification technology. Compared with the traditional nitrification and denitrification process, it can save 62.5% of the aeration rate and 100% of the organic carbon source requirement, and greatly reduce the output of excess sludge. Short-cut nitrification is the key step of PN / Anammox. [0003] However, the key to current short-cut nitrification lies in the selective inhibition and elution of nitrite oxidizing bacteria (NOB), for high ammonia nitrogen c...

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Problems solved by technology

[0003] However, the key to current short-cut nitrification lies in the selective inhibition and elution of nitrite oxidizing bacteria (NOB), for high ammonia nitrogen concentration (≥500mgNH 4 -N / L), through the inhibitory effect of free ammonia (FA), free nitrous acid (FNA) and low dissolved oxygen (DO) on NOB, and reasonable control of sludge age (SRT), NOB can be easily washed from the system off, but for low ammonia nitrogen concentration (≤80mgNH 4 -N / L) and medium ammonia nitrogen concentration (100-300mgNH 4 -N / L) of the soil, FA and FNA concentration is not enough to inhibit the activity of NOB, it is more difficult to elute it

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