| Autor: |
Wang, Lan1,2, Zheng, Ping3 pzheng@zju.edu.cn, Abbas, Ghulam4, Xing, Yajuan3, Li, Wei3, Wang, Ru3, Deng, Liangwei1,2, Lei, Yunhui1,2, Zheng, Dan1,2, Zhang, Yunhong1,2 |
| Předmět: |
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| Zdroj: |
Journal of Environmental Management. Dec2016 Part 2, Vol. 184, p196-203. 8p. |
| Abstrakt: |
Nitrification is an acidifying process that requires the addition of external alkalinity because of the alkaliphilic nature of the most ammonia-oxidizing bacteria. In this study, aerobic activated sludge was used as inoculum in an internal loop air-lift reactor, which resulted in successful enrichment of acid-tolerant nitrifying (ACIN) sludge at pH 6.0 by sequential addition of tea orchard soil suspension. The results showed that ACIN sludge had a remarkable acid tolerant capability with a volumetric ammonia conversion rate of 1.13 kg N m −3 day −1 . ACIN sludge showed a higher maximum specific ammonia conversion rate (0.29 g N g −1 VSS day −1 ) than neutrophilic nitrifying sludge (0.14 g N g −1 VSS day −1 ) at pH 6.0 and had good resistance against pH fluctuations, with a maximum specific ammonia conversion rate (0.584 g N g −1 VSS day −1 ) at pH 7.5. Microbial community analysis indicated that the higher abundance of acid tolerant Nitrosospira and ammonia-oxidizing archaea laid a solid foundation for the remarkable acid-tolerant capability of ACIN sludge. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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Full Text from ScienceDirect