SHANG Yue-fei,ZONG Ni,QI Rong,et al.Operation Stability of Typical Urban Sewage Biological Nutrients Removal Process in Winter[J].China Water & Wastewater,2021,37(19 19):78-84.
Operation Stability of Typical Urban Sewage Biological Nutrients Removal Process in Winter
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
19 19
Page:
78-84
Column:
Date of publication:
2021-10-01
- Keywords:
- biological nutrients removal process; operation under low temperature in winter; process analysis; filamentous bacteria
- Abstract:
- Three typical biological nutrients removal (BNR) processes for urban sewage treatment were monitored continuously during the low temperature period in winter. By analyzing the continuous variable trend of carbon (C), nitrogen (N), phosphorus (P) and other target pollutant concentrations in different units, a quick method of process analysis was established, including process quality analysis, simple stoichiometry calculation and biokinetic calculation, to find the main factors affecting the stability of effluent quality meeting the first level A of GB 18918-2002 of typical biological treatment process during the low temperature period in winter. The results showed that，during the operation of the BNR process in winter, although temperature had a significant effect on the biological nitrification rate, however，the high COD removal ratio (>77%) in the non-aerated area was the key factor for the stable removal of the overall target pollutants. The microscopy identification results showed that， the sludge bulking phenomenon was easily induced by the filamentous bacteria such as Type0092 and Type0041 in the anoxic/aerobic (A/O) BNR process during low temperature periods in winter, but had little influence on the effluent quality.
Last Update:
2021-10-01