کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4998111 | 1459922 | 2016 | 5 صفحه PDF | دانلود رایگان |
- A novel fluidized bed reactor can achieve high performance at low HRT of 50Â min.
- The COD: NO3â-N ratio of 3 indicated the highest COD and nitrate removal efficiency.
- The ratio of COD: NO3â-N strongly influenced the composition of microbial community.
A novel configured fluidized bed reactor (FBR) with granular rubber as the fluidized media was operated without internal recirculation to achieve denitrification. This FBR could operate under a low hydraulic retention time (HRT) of 50Â min due to the low rubber media density and absence of recirculation. Synthetic nitrate-rich wastewater with a fixed nitrate (NO3â-N) concentration and varying COD concentrations was fed into the FBR. The nitrate removal profile showed a rapid nitrate reduction at the bottom of the reactor with a high performance under the low HRT. Different microbial communities were identified using Illumina Miseq sequencing. The dominant microorganisms belonged to the Beta- and Gamma-proteobacteria classes and played important roles in nitrate reduction. Acidovorax was abundant at low COD: NO3â-N ratios, while Rhizobium and Zoogloea were dominant at high COD: NO3â-N ratios. The COD: NO3â-N ratio strongly influenced the composition of the microbial community including the dominant species.
Journal: Bioresource Technology - Volume 221, December 2016, Pages 677-681