Method and apparatus for nitration and nitrate nitrogen enrichment of one-piece combined membrane bioreactor

Abstract

The invention relates to a method and an apparatus for nitration and nitrate nitrogen enrichment of a one-piece combined membrane bioreactor, and belongs to the technical field of sewage treatment. A method for nitration and nitrate nitrogen enrichment of a split-type combined membrane bioreactor is characterized by comprising the following steps: raw water introduction; connection of a membrane module A, flow setting and aerobic nitration reaction ; power supply connection and current setting; setting of pumping stop time ratio and cleaning of the membrane module A; and re-operation. A special-purpose implementation apparatus is provided to complete the above steps. The method and apparatus can convert ammonia nitrogen in waste water into nitrate nitrogen and carry out nitrate nitrogen enrichment in a single treatment unit, and overcomes insufficiencies and defects of a low C / N ratio waste water treatment method and a NO3<-> separation and enrichment method in the prior art; in addition, the apparatus has a simple structure and is convenient for actual operations.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method and a device for nitrifying and enriching nitrate nitrogen in an integrated combined membrane bioreactor. Background technique [0002] The problem of water eutrophication has become increasingly prominent. In recent years, a series of problems caused by it have seriously affected the daily life of residents. Nitrogen and phosphorus are the main factors that cause eutrophication of water bodies. Therefore, it is particularly important to meet the discharge standards of nitrogen and phosphorus in sewage. To treat low C / N ratio wastewater, organic carbon sources are usually added to achieve efficient denitrification. However, this consumes limited organic resources and increases operating costs. [0003] Studies have found that ammonia nitrogen in wastewater is easily converted into nitrate nitrogen under the action of aerobic activated sludge (mainly...

AI Technical Summary

Problems solved by technology

Adsorption and ion exchange methods (such as zeolite, ion exchange resin), can separate and concentrate NO 3 - , but there are problems such as limited adsorption capacity, high regeneration frequency, and secondary pollution caused by chemical regeneration. Therefore, most of the current applications of zeolite denitrification are for slightly polluted river water, landscape water, and effluent from secondary sedimentation tanks. body of water

Electrodialysis ( ED ) is often used to remove NO from wastewater. 3 - Enrichment, this method has the advantages of low energy consumption and high efficiency, but electrodialysis has certain limitations, that is, only specific ions are allowed to pass through the membrane, but water molecules cannot pass through, and when the membrane is fouled, it is very difficult to clean the membrane

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