乙醇好氧颗粒污泥培养及其基质降解动力学

Investigation on Formation and Degradation Kinetics of Ethanol-fed Aerobic Granular Sludge

采用乙醇模拟废水在体外曝气循环式SBR内培养好氧颗粒污泥以研究其特性及其表观基质降解动力学．反应器启动后第8d，系统内观察到平均粒径约为0．3mm的初始颗粒污泥，随着有机负荷逐步提高到4．0gCOD／（L·d），好氧颗粒污泥逐渐成熟，其粒径范围为0．7～1．6mm，沉降速率为16．9～32．4m／h．成熟好氧颗粒污泥的比耗氧速率（SOUR）达到了31．24mgO2／（gMLSS·h），是活性污泥的1．5倍．此外，动力学模拟结果表明，相应的最大表观降解速率k和表观半速率常数K分别为5．91d^-1和1990．15mg／L．

To investigate the properties and kinetics of aerobic granular sludge, aerobic granules were cultivated with ethanol synthetic wastewater in a series of sequencing batch reactors （SBR）. The spherical shaped granules were observed on 8^th day with the mean diameter of 0. 3mm. With the organic loading rate （OLR） being increased to 4. 0gCOD/（ L ·d） , aerobic granules grew matured with spherical shape. The size of granules ranged from 0. 7 to 1.6mm, and the corresponding settling velocity of individual granule was 24. 2 - 36. 4m/h. The oxygen uptake rate （SOUR） of mature granules was 31.24mgO2/（ gMLSS·h）, which was 1.5 times higher than that of activated sludge （20. 24mgO2/（ gMLSS · h） ）. The experimental data indicated that the substrate utilization kinetics generally followed Monod＇ s kinetics model, the corresponding kinetic coefficients of k （ maximum specific substrate utilization rate） and Ks（ half velocity coefficient） were 5.91d^-1 and 1 990. 15mg/L respectively.