ZHANG Xiao-hang,FU Chao,FU Kun-ming.Nitrogen Removal Performance of CANON Process without Organic Carbon Sources[J].China Water & Wastewater,2021,37(17 17):9-18.
Nitrogen Removal Performance of CANON Process without Organic Carbon Sources
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
17 17
Page:
9-18
Column:
Date of publication:
2021-09-01
- Keywords:
- CANON process; ANAMMOX; denitrification; NOB; organic carbon source
- Abstract:
- The denitrification performance of the CANON sludge domesticated by sewage without organic carbon source was investigated, and the anaerobic ammonium oxidation (ANAMMOX) activity, nitrite oxidation activity, denitrification activity and autotrophic denitrification activity tests of the CANON sludge were carried out, respectively, to understand the denitrification performance of a CANON process without organic carbon source. The denitrification rate of ANAMMOX in the high-efficiency section was 0.21 g/(gVSS·d), and the denitrification rate of NOB in CANON sludge was only 0.012 5 g/(gVSS·d), indicating that the CANON sludge had good denitrification and partial nitrification performances. When methanol was added as the carbon source, the denitrification performance was bad in a short period, and the denitrification rate was 5.28×10-3 g/(gVSS·d) and only 2.5% of the ANAMMOX. The CANON sludge activity tests showed that the nitrogen removal rate was as high as 0.58 g/(gVSS·d) and 2.75 times that of the ANAMMOX at the beginning of the reaction before the dissolved oxygen (DO) inhibited the ANAMMOX bacteria. However, when the DO was too high, the denitrification rate of the CANON process decreased rapidly due to the inhibition of the ANAMMOX bacteria. The highthroughput sequencing results showed that the relative abundances of ANAMMOX bacteria, AOB, NOB, and denitrifying bacteria in the reactor were 19.87%, 6.84%, 0.05%, and 0.23%, respectively.
Last Update:
2021-09-01