| PD-DPR系统处理城市污水与高硝酸盐废水实现稳定亚硝酸盐积累和磷去除的特性 |
| 摘要点击 1117 全文点击 634 投稿时间：2019-09-26 修订日期：2019-10-21 |
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| 中文关键词 短程反硝化(PD) 反硝化除磷(DPR) 内碳源 硝酸盐废水 厌氧氨氧化(ANAMMOX) |
| 英文关键词 partial denitrification (PD) denitrification phosphorus accumulation (DPR) intracellular carbon source nitrate wastewater anaerobic ammonia oxidation (ANAMMOX) |
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| 中文摘要 |
| 本研究以模拟城市污水和高硝酸盐废水为处理对象，在一个厌氧-缺氧-微曝气运行的SBR反应器内，将短程反硝化工艺（PD，NO3--N→NO2--N）与反硝化除磷工艺（DPR）耦合，并通过联合调控进水C/N比、厌氧排水率和缺氧时间，考察了PD-DPR系统的亚硝酸盐积累特性和除磷性能.结果表明，经过140 d，NO3--N→NO2--N转化率（NTR）为80.1%，PO43--P去除率高达97.64%.在厌氧段（180 min），聚糖菌（GAOs）和聚磷菌（PAOs）对污水有机碳源进行充分利用，将其转化为内碳源；缺氧段（150 min），反硝化聚糖菌（DGAOs）和异养反硝化菌（DOHOs）分别进行内源和外源短程反硝化实现NO2--N稳定积累，同时反硝化聚磷菌（DPAOs）进行高效反硝化吸磷；微曝气段（10 min），在不发生硝化反应的前提下，PAOs超量吸磷，提高了系统的除磷性能.系统出水NO2--N/NH4+-N为1.31：1（接近厌氧氨氧化工艺理论值1.32：1），PO43--P浓度为0.30 mg·L-1，COD浓度为12.94 mg·L-1.其出水水质可满足与厌氧氨氧化（ANAMMOX）工艺耦合进行深度脱氮的需求. |
| 英文摘要 |
| In this study, a novel process combining partial denitrification (PD, NO3--N→NO2--N) and denitrifying phosphorus removal (DPR) in an anaerobic-anoxic-aerobic sequencing batch reactor (SBR) was developed. By comprehensively controlling the influent C/N ratio, anaerobic drainage ratio, and anoxic duration, the nitrite accumulation and phosphorus removal performance of a system treating high-strength nitrate and municipal wastewaters was investigated. The results showed that, after 140 days, the nitrate-to-nitrite transformation ratio (NTR) was 80.1%, and PO43--P removal efficiency was 97.64%. In the anaerobic stage (180 min), glycogen-accumulating organisms (GAOs) and phosphorus-accumulating organisms (PAOs) efficiently utilized the carbon source in municipal wastewater to enhance intracellular carbon storage. In the anoxic stage (150 min), denitrifying GAOs (DGAOs) and heterotrophic denitrifying bacteria (DOHOs) carried out endogenous and exogenous short-range denitrification, respectively, to achieve stable nitrite accumulation; simultaneously, denitrifying PAOs (DPAOs) carried out denitrifying phosphorus uptake to achieve efficient phosphorus removal. In the aerobic stage (10 min), without initiating ammonia/nitrite oxidation, PAOs absorbed excessive phosphorus, which improved the phosphorus removal performance of the system. The effluent NO2--N/NH4+-N of a ratio of 1.31:1 (close to the theoretical value of ANAMMOX process, 1.32:1), with little PO43--P and COD (0.30 and 12.94 mg·L-1), meets the requirements for deep-level nitrogen removal by coupling with ANAMMOX process. |
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