Efficient biological membrane synchronous nitrification and denitrification low-carbon sewage denitrification process

Abstract

The invention relates to an efficient biofilm synchronous nitrification and denitrification low-carbon sewage denitrification process. The following steps are carried out in a moving bed biofilm reactor (MBBR): 1) starting activated sludge biofilm culturing, 2) carrying out stable biofilm culturing, 3) carrying out biological enhancement by using an HN-AD microbial agent, and 4) strengthening stable operation. The solid carbon source is added into the MBBR, so that the carbon source required by the growth of microorganisms is provided, the solid carbon source can also be used as a biofilm attachment carrier, the stability of the synchronous nitrification and denitrification process is improved, the process can be realized in one reactor, the process flow is shortened, the capital construction cost is reduced, and the operation and maintenance difficulty is low. MBBR has the advantage of no need of backwashing, and HN-AD bacteria with extreme condition tolerance and efficient denitrification performance are utilized to perform biological enhancement on the process, so that the process has the advantages of strong tolerance, high denitrification efficiency, good effluent stability and the like. The process has more outstanding advantages under extreme conditions of low temperature, low carbon, high ammonia nitrogen and the like in conventional treatment.

Description

technical field [0001] The invention relates to the technical field of sewage denitrification treatment, in particular to an efficient biofilm synchronous nitrification and denitrification low-carbon sewage denitrification process. Background technique [0002] Excessive nitrogen discharge from the tail water of urban sewage treatment plants is one of the main reasons for the excessive nitrogen content in the water environment. The removal rate standard has also been improved. With the development of social urbanization, urban sewage presents a low-carbon trend. Carbon is one of the main factors affecting the removal rate of biological denitrification. Low carbon will lead to the lack of carbon source for microorganisms in the process of biological denitrification, which reduces the denitrification effect and makes it difficult for the tail water to meet the discharge requirements. Therefore, the biological Nitrogen removal has become the main problem of sewage treatment. ...

AI Technical Summary

Problems solved by technology

The nitrification reaction and denitrification reaction of this type of traditional biological denitrification process are carried out separately, the denitrification process is complicated, and the denitrification cycle is also long, which greatly reduces the denitrification efficiency

The addition of liquid carbon sources leads to high processing costs and cumbersome operation and maintenance

Moreover, the addition of liquid carbon sources requires high processing operations and is difficult to control. There is a risk of excessive organic matter in the tail water, and the process stability is poor.

In addition, the traditional biological treatment process not only cannot tolerate extreme conditions such as low temperature, but also has poor tolerance to fluctuations in influent water quality. Under conditions such as low temperature and large fluctuations in influent water quality, the effect of nitrogen removal is poor, and the effluent is difficult to meet the discharge requirements.

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