Promotive effect of pyridine on indole degradation by activated sludge under anoxic conditions |
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Authors: | Li Yongmei Li Wenshu and Gu Guowei |
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Institution: | (1) State Key Laboratory of Pollutant Control and Resources Reuse, Tongji University, Shanghai, 200092, China;(2) Jiangsu Electric Power Design Institute, Nanjing, 210024, China |
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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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Translated from Environmental Science, 2006, 27(2): 300–304 译自: 环境科学] |
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Keywords: | indole pyridine promotive effect denitrification nitrate reductase activity |
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