A kind of method and device for short-range nitrification of sewage

Abstract

The invention provides a method and device for short-path nitrification of dirt, the method for short-path nitrification includes: providing a dirt; performing aeration and stirring steps on the dirt to obtain a treated dirt; A part of the treated dirt is discharged, a precipitation step is performed on the remaining part of the treated dirt, and water is filtered out after stratification; wherein, the DO value in the dirt is controlled at 0.20-0.80 mg / L between, and the pH value and the pH change rate are used as the basis for judging the end time point of the aeration step. The short-range nitrification method according to the present invention is easy to operate, low in cost, low in energy consumption and strong in reliability, and is more conducive to realizing regional circulation of resources and energy.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method and a 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 the majority of scientific researchers. At present, the short-path nitrification / anammox process (PN / Anammox) is considered to be the most promising biological nitrogen removal technology. Compared with the traditional nitrification and denitrification process, it can save 62.5% of the aeration amount and 100% of the organic carbon source requirement, and greatly reduce the output of excess sludge. Short-range nitrification is a key step in PN / Anammox. [0003] However, the key to current short-range nitrification lies in the selective inhibition and elution of nitrite oxidizing bacteria (N...

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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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