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Promotive effect of pyridine on indole degradation by activated sludge under anoxic conditions

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Abstract

Batch experiments were carried out to investigate the promotive effect of pyridine on indole degradation under denitrifying conditions. The seed sludge was obtained from a local coal-coking wastewater treatment facility and was acclimated in the laboratory. Indole and pyridine were supplemented to the synthetic wastewater at different ratios. The optimum ratio of chemical oxygen demand (COD) to nitrate (C/N) was 8.4–8.9 for both denitrification and indole and pyridine degradation. At a temperature of 28°C and pH of 7.0–7.5, the nitrate reductase activity (NRA) was in the best state. The addition of pyridine could promote NRA and the degradation of indole. When the initial concentration of indole was 150 mg/L, the concentration ratio of indole to pyridine was in the range of 1–10. Under optimum C/N conditions, the degradation of indole could be described with pseudo-zero-order kinetics. There was no accumulation of nitrite during the reaction. When the concentration ratio of pyridine to indole was less than 0.25 with an increase in the pyridine proportion, there were more significant augment rates for NRA and the degradation of indole than the situation when the concentration ratio was more than 0.25.

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Authors and Affiliations

  1. State Key Laboratory of Pollutant Control and Resources Reuse, Tongji University, Shanghai, 200092, China

    Li Yongmei, Li Wenshu & Gu Guowei

  2. Jiangsu Electric Power Design Institute, Nanjing, 210024, China

    Li Wenshu

Authors
  1. Li Yongmei
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  2. Li Wenshu
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  3. Gu Guowei
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Correspondence to Li Yongmei.

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Translated from Environmental Science, 2006, 27(2): 300–304 [译自: 环境科学]

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Li, Y., Li, W. & Gu, G. Promotive effect of pyridine on indole degradation by activated sludge under anoxic conditions. Front. Environ. Sci. Eng. China 1, 493–497 (2007). https://doi.org/10.1007/s11783-007-0079-0

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