Journal
BIORESOURCE TECHNOLOGY
Volume 297, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122455
Keywords
Nitrogen removal; Full-scale wastewater treatment plants (WWTPs); Treatment processes; Influent characteristics; Denitrification rate; Functional genera
Funding
- National Natural Science Foundation of China [51708171, 51878243]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), China
- China Postdoctoral Science Foundation [2018 M630508, 2019 T120390]
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The denitrification process is crucial for biological nitrogen removal in wastewater treatment plants (WWTPs). In this study, the nitrogen removal efficiency in full-scale WWTPs with different treatment processes and influent characteristics was investigated. The results indicated that the average total nitrogen removal rate (NRR) and denitrification rate in the A/O or A2/O systems were 67.5% and 2.08 mg N h(-1) gMLVSS(-1), respectively. However, cyclic activated sludge systems (CASSs) showed more efficient nitrogen removal with an average NRR and denitrification rate of 79.6% and 9.89 mg N h(-1) gMLVSS(-1), respectively. The microbial communities in WWTPs with similar influent compositions were similar and mainly shaped by BOD5. Candidatus Competibacter, Caldilineaceae and Anaerolineaceae were the functional genera closely associated with nitrogen removal based on high-throughput sequencing and correlation analysis. This study provides new insights into the regulation and amelioration of full-scale WWTPs to meet the increasingly stringent nitrogen discharge standard.
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