A device and method for starting and stably maintaining short-cut nitrification of urban sewage

Abstract

A device and method for starting and stably maintaining short-cut nitrification of urban sewage belongs to the field of urban domestic sewage treatment. The device is mainly composed of a raw water tank, a short-range nitrification device for urban sewage, a full-process nitrification device, a sludge treatment device and a sludge return device. The method is to use the difference in the recovery rate of AOB and NOB after high-temperature treatment of activated sludge to start short-range nitrification, and combine the sludge treatment device to improve the operation stability of short-range nitrification, thereby starting and stably operating the short-range nitrification of urban sewage. The device is easy to operate, has a high degree of self-control, short-cut nitrification saves aeration, low sludge output, and reduces treatment costs.

Description

technical field [0001] A device and method for starting and stably maintaining short-range nitrification of urban sewage related to the present invention belongs to the field of biological treatment of urban sewage and is suitable for denitrification treatment of urban sewage with low carbon ratio; Background technique [0002] In recent years, the problem of eutrophication in my country's water bodies has occurred frequently. The reason is that the nitrogen and phosphorus elements in the water body exceed the standard. Therefore, urban sewage treatment plants have higher and higher requirements for nitrogen and phosphorus treatment; compared with phosphorus removal, nitrogen removal The problem is more urgent, and the process of denitrification needs to be improved urgently; [0003] The short-range nitrification and denitrification and short-range nitrification anammox denitrification processes that have emerged in recent years have many advantages, such as: saving aeration...

AI Technical Summary

Problems solved by technology

[0004] At present, the methods used to achieve short-cut nitrification mainly include high-concentration free ammonia (FA) and high-concentration free nitrite (FNA), low dissolved oxygen (DO), short sludge time (SRT) combined with aeration time control. Aerobic intermittent aeration means and adding inhibitors, etc. Although the above methods can achieve short-range nitrification, the start-up time is long, and the short-range operation is difficult to maintain stably. Once aeration occurs, the short-range will be destroyed;

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