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.
亚硝酸盐型反硝化除磷系统的快速建立及除磷特性
- Title:
- Rapid Establishment of Nitrite-type Denitrifying Phosphorus Removal System and Its Phosphorus Removal Performance
- Keywords:
- denitrifying phosphorus removal; carbon source; operation mode; PAOs; nitrite; microbial community structure
- 摘要:
- 亚硝酸盐型反硝化除磷被认为是最节能的强化生物除磷技术。采用SBR反应器，先后经过厌氧/好氧（A/O）（采用乙酸钠和丙酸钠等比例混合碳源）和厌氧/缺氧/好氧（A2O）（以丙酸钠和乙酸钠为单一碳源，分别记作R1和R2）模式运行以实现亚硝酸盐型反硝化除磷。结果表明，在A/O阶段投加亚硝酸盐有利于反硝化除磷的快速构建，A2O运行阶段的第1天两系统的缺氧除磷率即分别可达48.18%和46.60%；逐步增大亚硝酸盐浓度并改变为批次投加，同时延长缺氧水力停留时间，运行36 d后，R1和R2均实现了高效的亚硝酸盐型反硝化除磷，最高缺氧除磷率分别达到78.38%和77.02%。高通量测序结果显示，经过A2O 运行模式驯化后，聚磷菌丰度由5.55%分别提升到27.77%和13.62%，且主要菌属为Accumulibacter、Pseudomonas、Dechloromonas和Flavobacterium，其中Flavobacterium丰度最高，与A/O 运行阶段相比，R1和R2系统中Flavobacterium的丰度分别增加了23.35%和8.50%，是实现高效亚硝酸盐型反硝化除磷的主要功能菌属之一。
- 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.
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