The Growth of Denitrifying Bacteria in Immobilized State and Nitrogen Removal Performance Analysis of Denitrification Embedded Immobilized Fillers
For the treatment of nitrogen-containing sewage and wastewater, denitrification embedded immobilized filler show high nitrogen removal performance and stability, but the cultivation of a large number of compound denitrifying bacteria needed for embedding immobilization requires a huge industrial-scale fermentation system, with substantial amounts of chemicals, a large amount of acid to balance pH, and the discharge of a large amount of supernatant. This undoubtedly increases the production costs of embedded immobilized fillers. Therefore, we investigated whether denitrifying bacteria can be embedded through initial domestication to achieve growth in immobilized state, which would facilitate the industrial application of embedded filler. In this experiment, the operation conditions of the acclimated cultivation of denitrifying bacteria in the sludge state were investigated, and subsequently, the composite denitrifying bacteria in different incubation periods were entrapped separately. Comparative experiments were carried out on the different embedded immobilized fillers obtained, and high-throughput tests were performed. The results showed that the denitrifying bacteria could achieve good self-proliferation in immobilization filler, and the nitrogen removal performance was excellent. To achieve a good balance between mass transfer and economical operation in practical engineering, the variations in the nitrogen removal performance of the fillers under different up-flow velocities were investigated. It is concluded that the change range of the corresponding nitrogen removal rate is not the same when changing the up-flow velocity of the same amplitude in different stages. Overall, a up-flow velocity of 3.0 m/h is recommended
Year of publication: |
[2022]
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Authors: | Zhang, Xin ; Yang, Hong |
Publisher: |
[S.l.] : SSRN |
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