Two-stage low-energy sewage treatment method and system using pretreatment and micro-aeration

Abstract

The present invention adopts pretreatment and micro-aeration two-stage low-energy sewage treatment method, comprising: a). Pretreatment of sewage, utilizing microorganisms to adsorb organic matter and suspended matter in sewage; b) Settling of sewage; c ). Denitrification of sewage. Nitrosifying bacteria convert ammonia nitrogen in sewage into nitrite nitrogen, and anammox bacteria convert ammonia nitrogen and nitrite nitrogen into nitrogen gas to achieve denitrification. The sewage treatment system of the present invention includes a pretreatment tank, a pretreatment sedimentation tank, a denitrification tank, a blower, a controller and a detector. The blower realizes aeration, the detector detects water quality, and the controller controls the operation of the sewage treatment system. The sewage treatment system and method of the present invention rely on the denitrification effect of the anammox bacteria to convert most of the nitrogen element into nitrogen gas, and truly leave the water body and pollutants. In the sludge treatment stage, organic matter is converted into energy through anaerobic fermentation, which can bring considerable power consumption to the sewage plant and maintain the activity of denitrification microorganisms.

Description

technical field [0001] The invention relates to a two-stage low-energy sewage treatment method and system using pretreatment and micro-aeration. An inorganic sewage treatment method and system for anaerobic fermentation. Background technique [0002] The concentration of ammonia nitrogen in my country's urban sewage is generally too high, resulting in a carbon-to-nitrogen ratio lower than 4. The biological denitrification process of sewage includes three processes of ammonification, nitrification and denitrification. The ammonification and nitrification process requires aeration to completely convert organic nitrogen and ammonia nitrogen into nitrate nitrogen, which consumes a lot of energy. The denitrification process needs to provide enough organic matter to convert the nitrate nitrogen in the water body into nitrogen gas. In addition, in the previous treatment process, part of the nitrogen element was removed through the absorption of ammonia nitrogen by the microorgan...

AI Technical Summary

Problems solved by technology

In addition, in the previous treatment process, part of the nitrogen element was removed through the absorption of ammonia nitrogen by the microorganism's own growth needs. In fact, it did not leave the sewage plant, but was transferred to the sludge, and released into the digestive juice during the sludge treatment process. In the process, the digestive juice is returned to the sewage treatment process, which increases the treatment burden

On the other hand, due to the low carbon and nitrogen ratio in sewage, conventional processes often show incomplete denitrification, which makes it difficult to completely remove nitrogen in sewage, or thus adding additional carbon sources increases the operating costs of sewage plants

In addition, due to the need for the sewage to experience different environments, the sewage is continuously distributed and returned throughout the treatment process. There are too many control factors and the operation process is extremely complicated.

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