Issue 2, 2023

Solving the problem of high concentration aniline inhibiting nitrogen removal: starting the SBBR with the prolonged aeration mode

Abstract

A sequencing batch biofilm reactor (SBBR) was started in the prolonged aeration mode, to solve the problem that wastewater with a high concentration of aniline (600 mg Lāˆ’1) inhibits nitrogen removal due to its extreme toxicity. Aniline was remarkably degraded in the first stage, and the removal efficiency of NH4+ā€“N reached 99.70%, and an excellent nitrification effect was achieved by prolonged aeration. In the O/A stage, TN removal efficiency was 86.87%, which was about 50% higher than that of 600 mg Lāˆ’1 aniline wastewater treated by SBR in previous studies, showing that the SBBR improved the nitrogen removal effect. According to the results of high-throughput sequencing, aniline-degrading bacteria, such as Rhodococcus, played a major role. Moreover, more heterotrophic nitrifiers were collected in this reactor, such as Chryseolinea, which had never appeared in our previous studies. Compared with activated sludge, more denitrifiers accumulated on the biofilm, promoting biodiversity. Therefore, the pollutant elimination performances, especially for TN, were successfully improved in this system.

Graphical abstract: Solving the problem of high concentration aniline inhibiting nitrogen removal: starting the SBBR with the prolonged aeration mode

Supplementary files

Article information

Article type
Paper
Submitted
19 Oct 2022
Accepted
29 Dec 2022
First published
13 Jan 2023

Environ. Sci.: Water Res. Technol., 2023,9, 630-641

Solving the problem of high concentration aniline inhibiting nitrogen removal: starting the SBBR with the prolonged aeration mode

B. Lin, Q. Zhang, J. Su, M. Li, Y. Zhang, J. He, N. Wu, X. Liu and H. Wei, Environ. Sci.: Water Res. Technol., 2023, 9, 630 DOI: 10.1039/D2EW00808D

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