1. Nitrite soaking pretreatment induced initial denitrifying nitrite accumulation.
- Author
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Zhao, Ji, Wu, Yuzhe, Wang, Jimiao, Gu, Ruihuan, Ding, Zhigang, Liu, Zhen, Zhang, Yan, Yu, Deshuang, and Wang, Xiaoxia
- Subjects
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MICROBIAL communities , *COMMUNITY change , *DENITRIFICATION - Abstract
[Display omitted] • After nitrite soaking pretreatment, initial denitrifying NO 2 – accumulation emerged. • Longer soaking duration induced higher nitrite accumulating amount. • Nitrite accumulation benefited from soaking at a certain NO 2 – concentration range. • Substrates frequent feed and pH regulation improved denitrifying NO 2 – accumulation. • Further investigation on pretreatment ways for quickly starting PD is encouraged. Partial denitrification (PD) could be another method for obtaining nitrite. However, PD startup takes a long time limiting its investigation and application. This study proposed nitrite soaking as a pretreatment method for starting PD. Results showed that denitrifying nitrite accumulation (4.20 mg/L) emerged after previously soaking by 10 mg/L nitrite for 9 h. When the duration was 6 h, comparing different soaked nitrite concentrations, the highest denitrifying nitrite accumulation amount (4.92 mg/L) was obtained in the 20 mg/L group. Nevertheless, high pH of 9 and frequent feeding could further advantage denitrifying nitrite accumulation. Pretreatment as a disturbance would impel the microbial community to change from complete denitrification towards PD. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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