A dual-tank simultaneous nitrification and denitrification process based on a carbon source slow-release suspended biological carrier

Abstract

The invention belongs to the technical field of sewage treatment, and provides a double-pond synchronous nitrification and denitrification process based on a carbon source slow-release suspended biological carrier. Firstly, polybutylene succinate, bamboo powder and natural clinoptilolite are added to the biological carrier, so that the carrier has the ability of slow release of carbon source, adsorption of ammonia nitrogen and enrichment of nitrifying bacteria in the initial stage of film forming, so as to improve the film forming performance. Secondly, the reactor is divided into double pools with a volume ratio of 1:1, both of which are equipped with aeration discs and agitators. In the aeration tank of the previous cycle, the microorganisms were in a starvation state, so a large amount of external carbon sources can be stored and converted into their own internal carbon sources while the water is influent, which can be used for the later denitrification process, and then in the case of low-carbon nitrogen ratio influent water In this way, the removal of nitrates is strengthened, and the effect of simultaneous nitrification and denitrification denitrification is enhanced, so that the concentration of ammonia nitrogen and total nitrogen in the effluent can meet the discharge requirements.

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, a suspended biological carrier and a reactor are improved, so as to have carbon source slow-release, adsorption of ammonia nitrogen and enrichment of nitrifying bacteria in the initial stage of film formation Under the condition of low-carbon nitrogen ratio operation, the external carbon source can be more fully utilized, the removal of nitrate can be strengthened, and the effect of simultaneous nitrification and denitrification 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. In addition, the over-exploitation of water resources and the widespread phen...

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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