Double-tank synchronous nitrification and denitrification process based on carbon source slow-release suspended biological carrier

Abstract

The invention belongs to the technical field of sewage treatment, and provides a double-tank synchronous nitrification and denitrification process based on a carbon source slow-release suspended biological carrier. Firstly, poly (butylene succinate), bamboo powder and natural clinoptilolite are added into a biological carrier, so that the carrier has the capabilities of slowly releasing a carbon source, adsorbing ammonia nitrogen and enriching nitrifying bacteria in the early stage of biofilm formation, and the biofilm formation performance is improved. Secondly, the reactor is divided into two tanks with the volume ratio of 1: 1, each tank is provided with an aeration disc and a stirrer, two-tank alternate continuous flow or two-tank alternate intermittent flow water inflow is adopted, a water inlet tank in the current period is an aeration tank in the last period, and microorganisms are in a starvation state, then a large quantity of external carbon sources can be stored and converted into internal carbon sources during water inflow, and used for a later denitrification process, so that under the condition of low-carbon-nitrogen-ratio inflow water, the removal of nitrate is enhanced, the synchronous nitrification and denitrification nitrogen removal effect is enhanced, and the effluent ammonia nitrogen and total nitrogen concentration can meet the up-to-standard discharge requirement.

Description

technical field [0001] The invention relates to a moving bed biofilm process and a composite process of biofilm and activated sludge, and based on this, the suspended biological carrier and the reactor are improved, so that it has the functions of slow release of carbon source, adsorption of ammonia nitrogen and enrichment of nitrifying bacteria in the initial stage of film formation The ability to improve the film-hanging performance; under the condition of low carbon-to-nitrogen ratio operation, the external carbon source can be more fully utilized, the removal of nitrate can be strengthened, and the synchronous nitrification and denitrification effect in the wastewater treatment process can be enhanced, which belongs to the technical field of sewage treatment. Background technique [0002] my country is a country with a large population. Although the total amount of water resources is relatively large, the per capita water resources are only a quarter of the world level. ...

AI Technical Summary

Problems solved by technology

Compared with the activated sludge method and the fixed packing biofilm method, MBBR has both the high efficiency and operational flexibility of the activated sludge method and the advantages of the traditional biofilm method, such as impact load resistance, long sludge age and less residual sludge, and can be used to realize More efficient and stable SND, but the traditional suspended biological carrier as the core of the process usually has disadvantages such as lack of biological affinity and lack of functional design for enriching functional bacteria, making it difficult to further improve the SND effect

In addition, in recent years, the carbon-to-nitrogen ratio of urban sewage in my country has been maintained at a low level. While realizing SND, traditional MBBR reactors also face the problem of insufficient carbon sources, resulting in high nitrate nitrogen in the effluent.

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