缺氧颗粒污泥特性研究

Study on Characteristics of Anoxic Granular Sludge in SBR

采用SBR反应器在缺氧条件下培养颗粒污泥,并对其理化性质、生物组成以及反硝化活性进行了研究。研究表明,缺氧颗粒污泥的湿密度为1.003-1.021 g/cm3;VSS/SS在54%-68%,低于一般的好氧和厌氧颗粒污泥;颗粒沉速在8.4-108 m/h,高于普通活性污泥;颗粒污泥表面主要为短杆菌,细菌排列紧密,颗粒表面不平整,内部细菌较少,主要为杆菌,并且分布不连续。颗粒表面和内部均存在孔隙和空穴。缺氧颗粒污泥反硝化活性很好,NOX-N的最大比消耗速率(N/VSS)达到了0.092 mg/(mg.h)。

Granular sludge is cultivated in anoxic condition using sequencing batch reactor. This paper studied the physicochemical characteristics, composing of microorganisms, and the denitrification characteristics of anoxic granular sludge. The results show that the wet density of anoxic granular sludge is 1.003 - 1.021 g/cm^3 .The VSS/SS is 54% - 68%, lower than general anatomic and aerobic granular sludge. The settle ability is 8.4 - 108 m/h, higher than activated sludge. The microorganisms are mainly short bacillus and arrayed closely, but the surface is not smooth. There are less bacteria inside the sludge, the micrcorganisms are mainly bacillus and arrayed not closely as that in the surface. There are holes and cavities on surface and interior. The anoxic granular sludge shows great dcnitrifying activity. The maximum specific nitrite and nitrate activity is 0.092 mg/（mg·h）.