Device and method for starting and stably maintaining municipal sewage partial nitrification

Abstract

The invention discloses a device and a method for starting and stably maintaining municipal sewage partial nitrification, which belongs to the field of municipal domestic sewage treatment. The devicemainly comprises an original water tank, a municipal sewage partial nitrification device, a complete nitrification device, a sludge treatment device and a sludge return device. The method utilizes therestore rate difference between AOB and NOB after processing the activated sludge by high temperature to start partial nitrification, and combined with the sludge treatment device to improve the operating stability of partial nitrification, so as to start and stably operate the municipal sewage partial nitrification. The device is simple in operation, high in degree of self-control, which can save aeration rate for partial nitrification and have low sludge yield, so as to reduce the processing cost.

Description

Technical field [0001] A device and method for activating and stably maintaining short-range nitrification of urban sewage related to the present invention belongs to the field of urban sewage biological treatment, and is suitable for urban sewage denitrification treatment with low carbon ratio; Background technique [0002] In recent years, the problem of eutrophication of water bodies in my country has frequently occurred. The reason is that the nitrogen and phosphorus in the water body exceed the standards. Therefore, the treatment requirements of nitrogen and phosphorus in urban sewage treatment plants are getting higher and higher; compared with the removal of phosphorus, the removal of nitrogen The problem is more urgent, and the process of denitrification is in urgent need of improvement; [0003] The short-cut nitrification and denitrification and short-cut nitrification anaerobic ammonia oxidation denitrification processes that have emerged in recent years have many advanta...

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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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