کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4997412 | 1459912 | 2017 | 7 صفحه PDF | دانلود رایگان |
- Bioaugmentation could prevent unstable digestion system against further deteriorate.
- Bioaugmentation was able to effectively recover the failing digester.
- The increasing populations of Methanosaetaceae enhanced methane production.
This study aims to investigate the effect of bioaugmentation with enriched methanogenic propionate degrading microbial consortia on propionate fermentation under ammonia stress from total ammonia nitrogen concentration (TAN) of 3.0 g N Lâ1. Results demonstrated that bioaugmentation could prevent unstable digestion against further deterioration. After 45 days of 1 dosage (0.3 g dry cell weight Lâ1 dâ1, DCW Lâ1 dâ1) of bioaugmentation, the average volumetric methane production (VMP), methane recovery rate and propionic acid (HPr) degradation rate was enhanced by 70 mL Lâ1 dâ1, 21% and 51%, respectively. In contrast, the non-bioaugmentation reactor almost failed. Routine addition of a double dosage (0.6 g DCW Lâ1 dâ1) of bioaugmentation culture was able to effectively recover the failing digester. The results of FISH suggested that the populations of Methanosaetaceae increased significantly, which could be a main contributor for the positive effect on methane production.
Journal: Bioresource Technology - Volume 231, May 2017, Pages 94-100