| 不同污泥龄(SRT)对SNEDPR系统脱氮除磷影响 |
| 摘要点击 1491 全文点击 576 投稿时间：2018-07-03 修订日期：2018-07-17 |
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| 中文关键词 污泥龄(SRT) 同步硝化内源反硝化(SNED) 反硝聚磷菌(DPAOs) 反硝化聚糖菌(DGAOs) 反硝化除磷 |
| 英文关键词 sludge retention time (SRT) simultaneous nitrification-endogenous denitrification (SNED) denitrifying phosphorus accumulating organisms (DPAOs) denitrifying glycogen accumulating organisms (DGAOs) denitrifying phosphorus removal |
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| 中文摘要 |
| 为了解不同污泥龄（SRT）对同步硝化内源反硝化除磷（SNEDPR）系统脱氮除磷性能的影响，采用4组延时厌氧（180 min）/低氧（溶解氧0.5~1.0mg·L-1）运行的SBR反应器，以实际城市污水为处理对象，考察不同的SRT（5、10、15、25 d）条件下系统的脱氮除磷性能及其污泥性状的变化情况.结果表明，当SRT ≥ 10 d时，短SRT有利于提高PAOs的竞争优势；在SRT为15 d和10 d时，系统除磷性能均较高，尤其是当SRT=10 d时，PPAOs，An平均为68.4%，PRA和PUA分别高达31.9mg·L-1和34.3mg·L-1.在SRT为15 d和10 d时，系统的硝化性能不受SRT变化的影响，且在SRT=15 d时，系统具有最高的脱氮性能，TN去除率和SNED率分别平均为89.6%和71.8%.在SRT ≥ 10 d时，系统的COD去除性能不受SRT的变化影响，去除率达78%以上；但SRT=5 d时，由于系统生物量的流失使得系统对C、N、P的去除性能均较差，SNED率和PO43--P去除率分别低至5.7%和0.5%.此外，在SRT=15 d时，系统污泥沉降性能最好，SV和SVI分别为20%和64 mL·g-1，且污泥浓度随着SRT的延长而升高；长SRT（25 d）下系统抗冲击负荷能力较强，但污泥的沉降性能变差. |
| 英文摘要 |
| This study focuses on the nitrogen (N) and phosphorus (P) removal characteristics in a simultaneous nitrification endogenous denitrification and phosphorus removal (SNEDPR) system operating at different sludge retention time (SRT). Four extended anaerobic/low aerobic (dissolved oxygen:0.5-1.0 mg·L-1)-operated sequencing batch reactors (SBRs) fed with municipal sewage were studied at different SRT of 5, 10, 15, and 25 d. The experimental results show that a shorter SRT at an SRT ≥ 10 d enhances the competitive advantage of PAOs in the system and an efficient phosphorus removal performance of the SNEDPR system was achieved at a SRT of 10 d and 15 d. Especially at an SRT of 10 d; the average PPAOs, An was 68.4%, the PRA and PUA reached 31.9 and 34.3 mg·L-1, respectively. The nitrification performance of the system was not affected by SRT changes. The most efficient nitrogen removal performance was achieved at a SRT of 15 d, with a high average TN removal and SNED efficiencies reaching 89.6% and 71.8%, respectively. At a SRT ≥ 10 d, the COD removal performance of the SNEDPR system was also not affected by SRT changes. The COD removal efficiencies were higher than 78%. However, when the SRT was shortened to 5 d, the C, N, and P performances of the system worsened due to the loss of biomass; the SNED and PO43--P removal efficiencies were as low as 5.7% and 0.5%, respectively. In addition, at an SRT=15 d, the sludge-settling performance of the system was the best. The SV and SVI were 20% and 64 mL·g-1, respectively, and the sludge concentration increased with the extension of the SRT. Under long SRT (25 d) operation, the system showed a good resistance to shock loads, but the sedimentation performance of the sludge deteriorated. |
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