系列混合碳源在EBPR系统颗粒化进程中的影响研究

Effect of Mixed Carbon Sources in the Granulation Process of EBPR System

在SBR反应器中接种富含聚磷菌的活性污泥,以一系列不同比例的丙酸与乙酸混合为碳源条件,进行了EBPR系统颗粒化培养,考察了混合碳源中丙酸所占质量分数(以COD质量浓度计)的提高对EBPR系统颗粒化进程中颗粒粒径生长、污泥沉降性能、系统除磷效率等宏观特性的影响规律.结果表明,EBPR系统污泥颗粒生长速率随碳源中丙酸所占质量分数的增加而提高;碳源中丙酸所占质量分数较高的反应器污泥SVI值相对较高.经90 d培养,碳源中丙酸所占质量分数分别为0%、25%、50%、75%及100%的系统中成熟颗粒体积平均粒径分别为550.64、599.41、642.38、680.99和745.08μm,污泥SVI值分别稳定在30、40、50、60及75 mL.g-1左右.在相同的磷处理负荷下,各试验系统除磷性能产生了显著性差异.0%、25%、50%、75%及100%丙酸碳源系统平均净除磷能力(以MLSS计)分别为0.78、2.29、2.96、3.23及3.77 mg.g-1,平均除磷效率分别为31.5%、56.5%、77.4%、85.9%及97.0%.

Activated sludge highly enriched of phosphorus accumulating organisms （PAOs） were seeded, and cultivated with mixed carbon sources of different propionate to acetate ratios, to obtain granule-based enhanced biological phosphorus removal （EBPR） system. The results showed that the granule growth rate was obviously increased as the proportion of propionate in the mixed carbon sources increased. After operating for 90 d, the volume average particle diameters of the mature granules were 550. 64μm, 599.41 p,m, 642.38 μm, 680.99μm and 745.08 p,m, and the sludge volume indexes （SVI） of the mature granules were 30 mL.g-1, 40 mL.g-1, 50 mL.g-1, 60 mL-g-x and 75 mL-g-f, in the treatment of 0%, 25%, 50%, 75% and 100% propionate in mixed carbon sources, respectively. The phosphorus （P） removal performances of granule-based EBPR system cultivated with different carbon sources showed significant differences under the same P-loading. It was about 0.78 mg.g-l, 2. 29 mg.g-1, 2.96 mg.g-l, 3.23 mg.g-1 and 3.77 mg.g-lof net P removed in the treatment ofO% , 25% , 50% , 75% and 100% propionate in mixed carbon sources, respectively, which resulted in the phosphorus removal efficiencies were 31.5% . 56.5% . 77.4% . 85.9% and 97.0% _ resnectivelv