MBR中磁种好氧颗粒污泥的培养及对膜污染的影响

Cultivation of Aerobic Granular Sludge with Magnetic Seed and Its Effect on Membrane Fouling in MBR

以人工合成模拟废水为处理对象，在膜生物反应器（MBR）中培养磁种好氧颗粒污泥，并考察了其对膜污染的影响。结果表明，由絮状活性污泥培养磁种好氧颗粒污泥，开始污泥中大量繁殖丝状菌，然后丝状菌缠绕成细小的颗粒，最后慢慢形成颗粒污泥，其外表光滑，近似呈圆球形或椭球状。培养成熟的磁种好氧颗粒污泥的粒径为0．47～4．1mm，平均为1．7mm；SVI〈70mL／g，远低于普通活性污泥的（100～150mL／g）；沉降速度随粒径的增加而增大，范围为30—91m／h，而普通活性污泥的只有8～10m／h。同时，比较了絮状污泥MBR和磁种好氧颗粒污泥MBR在运行过程中膜通量的变化趋势，结果表明：磁种好氧颗粒污泥MBR的膜通量下降速度低于普通絮状活性污泥MBR的．这是磁种好氧颗粒污泥和反应器的流态共同作用的结果。

Aerobic granular sludge with magnetic seed was cultivated in MBR to treat artificially synthetic wastewater, and its effect on membrane fouling was investigated. The results indicate that dur- ing the process of cultivating aerobic granular sludge with magnetic seed by flocculent activated sludge, at the beginning, a considerable amount of filamentous bacteria is propagated, then the filamentous bacteria aggregate into very small granules, at last, the matured granular sludge is gradually formed with smooth surface and approximately spherical or spheroidal shape. The size of matured aerobic granular sludge with magnetic seed is 0.47 to 4.1 mm, and the average value is 1.7 mm. The SVI value is less than 70 mL/g, which is far less than that of conventional activated sludge （ 100 to 150 mL/g）. The settling velocity is increased with the increase of granule size, with a range of 30 to 91 m/h, which is far more than that of conventional activated sludge （8 to 10 m/h）. The variation trend of membrane fluxes in MBRs filled with flocculeut activated sludge and aerobic granular sludge with magnetic seed indicates that the decline rate of membrane flux in MBR filled with aerobic granular sludge with magnetic seed is less than that in MBR filled with conventional activated sludge, this results from the combined action of aerobic granular sludge with magnetic seed and the flow state of the reactor.