Method and system for low energy consumption sewage treatment with two stages of pretreatment and micro aeration

Abstract

The invention provides a method for low energy consumption sewage treatment with two stages of pretreatment and micro aeration, and the method comprises the following steps: a) pretreatment of sewage, that is adsorption of organic matters and suspension substances in sewage by microorganisms; b) settlement of sewage; c) denitrification of sewage, that is transformation of ammonia nitrogen in the sewage into nitrite nitrogen by nitrite bacteria, and transformation of ammonia nitrogen and nitrite nitrogen into nitrogen at the same time by anaerobic ammonium oxidation bacteria for realizing denitrification. A sewage treatment system provided by the invention comprises a pretreatment pool, a pretreatment sedimentation basin, a denitrification pool, a blower, a controller and a detector; the blower is used for realizing aeration, and the detector is used for detecting water quality, and the controller controls the operation of the sewage treatment system. The sewage treatment system and method provided by the invention transform most nitrogen elements into nitrogen by using denitrification of the anaerobic ammonium oxidation bacteria, so that the nitrogen element is departed from the water body and pollutants indeed. During a sludge treatment phase, organic matters are transformed into energy by anaerobic fermentation, and the energy can considerably supplement the electric quantity consumption of the sewage factory itself, and the activity of the denitrifying bacteria is kept.

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.

Images