کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5117084 | 1378115 | 2016 | 8 صفحه PDF | دانلود رایگان |
- An acid-tolerant nitrifying sludge was successfully enriched at pH 6.0.
- It had a high volumetric ammonia removal rate of 1.13Â kg-NÂ mâ3Â dayâ1 at pH 6.0.
- It had a high specific ammonia conversion rate (0.29Â g-NÂ gâ1 VSS dayâ1) at pH 6.0.
- It tolerates acid due to the dominant Nitrosospira and ammonia-oxidizing archaea.
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 mâ3 dayâ1. ACIN sludge showed a higher maximum specific ammonia conversion rate (0.29 g N gâ1 VSS dayâ1) than neutrophilic nitrifying sludge (0.14 g N gâ1 VSS dayâ1) at pH 6.0 and had good resistance against pH fluctuations, with a maximum specific ammonia conversion rate (0.584 g N gâ1 VSS dayâ1) 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.
Journal: Journal of Environmental Management - Volume 184, Part 2, 15 December 2016, Pages 196-203