新型生物流化床中悬浮相微生物与附着相微生物的共存研究

STUDY OF COEXISTENCE OF SUSPENDED MICROBES AND ADHERENT MICROBES IN NEW TYPE ITFB

针对新型好氧内循环三相生物流化床反应器处理污水的特性,对反应器中悬浮生长微生物和附着生长微生物的共存关系进行了研究。结果表明,生物膜厚度随反应器有机负荷的提高而增大;随反应器悬浮状态MLSS的增加而减小,但这些因素对生物膜总量影响不大。生物膜厚度还随反应器循环液速和气含率的增大而减小,这主要是因为水力剪切作用使生物膜厚度减小。总生物量的增加对COD的去除有利,而NH3-N的去除主要依靠悬浮生长的微生物。

Aiming at the characteristics of sewage treatment in new type aerated inner circulation three-phase biological fluidized bed （ITFB）,coexistence of suspended microbes and adherent microbes in ITFB was studied. The results indicated that the thickness of biofilm increased with increases of organic load of reactor and decreased with the increases of MLSS with suspended state in reactor, but these factors had not obvious influence on the total quantity ofbiofilm. In addition, the thickness ofbiofilm decreased with increases of cyclic liquid flow rate and air-containing rate in reactor. This is mainly because hydraulic shearing action makes biofilm thinning. The increase of total biofilm is advantageous to COD removal,while NH3-N removal mainly deponds on microbes of suspended growth.