YUZhan-yang,JINHai-dong,SONGBo,et al.Rapid Establishment of Nitrite-type Denitrifying Phosphorus Removal System and Its Phosphorus Removal Performance[J].China Water & Wastewater,2025,41(5):18-26.
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Rapid Establishment of Nitrite-type Denitrifying Phosphorus Removal System and Its Phosphorus Removal Performance

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第5期 Page: 18-26 Column: Date of publication: 2025-03-01
Author(s):
YU　Zhan-yang1;  JIN　Hai-dong1;  SONG　Bo2;  CHEN　Jin-yu1;  SHEN　Gong-qi1;  YUAN　Hao1;  ZHOU　Yuan1;  MA　Juan1; 3; 4
（1. School of Environmental and Municipal Engineering， Lanzhou Jiaotong University， Lanzhou 730070， China； 2. Gansu New Silk Road Travel Industry Development Co. Ltd.， Dingxi 730514， China； 3. Technical Center of Sewage Treatment Industry in Gansu， Lanzhou 730070， China； 4. Ministry of Education Engineering Research Center of Water Resource Comprehensive Utilization in Cold and Arid Regions， Lanzhou 730070， China）
Keywords:
denitrifying phosphorus removal;  carbon source;  operation mode;  PAOs;  nitrite;  microbial community structure
Abstract:
Nitrite-type denitrifying phosphorus removal process is considered as the most energy-efficient technology for enhanced biological phosphorus removal. In this study, sequencing batch reactor (SBR) was employed to achieve nitrite-type denitrifying phosphorus removal through the operation mode of anaerobic/aerobic (A/O) (fed with a mixture of sodium acetate and sodium propionate in equal proportions) and anaerobic/anoxic/aerobic (A2O) (with sodium propionate and sodium acetate as the sole carbon sources, labeled as R1 and R2 respectively) successively. The results showed that the addition of nitrite during the period of A/O operation favored the rapid establishment of the denitrifying phosphorus removal. The anoxic phosphorus removal rates of the first day with A2O operation were already 48.18% and 46.60% in both systems, respectively. It was found that after 36 days operation, high-efficient nitrite-type denitrifying phosphorus removal performance was achieved in both systems through increasing nitrite dosage gradually and step-feeding, as well as extending the anoxic hydraulic retention time. The maximum anoxic phosphorus removal rates were 78.38% and 77.02%, respectively. High-throughput sequencing results indicated that the abundance of polyphosphate-accumulating organisms (PAOs) in R1 and R2 systems increased from 5.55% to 27.77% and 13.62%, respectively, after A2O operating mode. The predominant genera were Accumulibacter, Pseudomonas, Dechloromonas and Flavobacterium, in which Flavobacterium was the most abundant genus. Compared to A/O operation mode, the abundance of Flavobacterium in the R1 and R2 systems increased by 23.35% and 8.50%, respectively, indicating that Flavobacterium was one of the main functional genera for efficient nitrite-type denitrifying phosphorus removal.
Last Update: 2025-03-01