中文关键词生物除磷颗粒COD浓度去除率胞外聚合物颗粒粒径PN/PS 英文关键词biological phosphorus removal granulesCOD concentrationremoval efficiencyEPSparticle sizePN/PS 中文摘要 本试验采用SBR反应器，接种成熟的生物除磷颗粒，通过分阶段改变进水中总磷（TP）和COD浓度，研究了不同磷浓度条件下COD负荷对生物除磷颗粒系统的影响，得出不同磷浓度下生物除磷颗粒系统具有良好性能所需最低COD浓度.结果表明，进水TP浓度为10 mg·L^-1时，生物除磷颗粒系统维持良好性能所需最低COD浓度为175 mg·L^-1，出水TP浓度在0.5 mg·L^-1以下，颗粒粒径和SVI分别为1020 μm和36 mL·g^-1，PN和PS含量（以MLSS计）分别为78 mg·g^-1和39 mg·g^-1，PN/PS较低，颗粒具有较好的结构和性能.进水TP浓度为6 mg·L^-1时，生物除磷颗粒系统良好除磷性能所需最低COD浓度为150 mg·L^-1，出水TP浓度在0.3 mg·L^-1以下，颗粒粒径和SVI分别为960 μm和35 mL·g^-1，PN和PS含量分别为75 mg·g^-1和35 mg·g^-1，PN/PS较低，颗粒具有较好的结构和性能.整个运行过程中，COD去除率在83%以上，出水COD浓度在25 mg·L^-1以下.在不同磷浓度条件下，随着进水COD浓度降低，微生物分泌PN和PS含量均减少，PN/PS增大，颗粒粒径减小，SVI增加，颗粒的结构和性能恶化. 英文摘要 In this study, the effect of COD loading on a biological phosphorus removal granule system under different phosphorus concentrations was investigated by changing the concentration of total phosphorus (TP) and COD in the influent. The lowest concentration of COD for good performance of the biological phosphorus removal system under different phosphorus concentrations was obtained. The results show that when the concentration of TP was 10 mg·L^-1 in the influent, the lowest concentration of COD for good performance of the biological phosphorus removal system was 175 mg·L^-1. The concentration of TP in the effluent was below 0.5 mg·L^-1; the particle size and SVI were 1020 μm and 36 mL·g^-1, respectively; and the contents of PN and PS (by MLSS) were 78 mg·g^-1 and 39 mg·g^-1, respectively. Furthermore, the PN/PS was lower and the granules had good structure and performance. When the concentration of TP was 6 mg·L^-1 in the influent, the lowest concentration of COD for good performance of the biological phosphorus removal system was 150 mg·L^-1. The concentration of TP in the effluent was below 0.3 mg·L^-1; the particle size and SVI were respectively 960 μm and 35 mL·g^-1; and the contents of PN and PS were 75 mg·g^-1 and 35 mg·g^-1, respectively. Moreover, the PN/PS was lower and the granules had good structure and performance. The removal efficiency of COD was above 83% and the concentration of COD in the effluent was below 25 mg·L^-1 throughout the operational process. Under different the influent phosphorus concentrations, the contents of PN and PS decreased, PN/PS increased, particle size decreased, SVI increased, and the structure and performance of the biological phosphorus removal granules deteriorated as the COD concentration decreased.

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