大分子有机物做碳源对污泥沉降性能的影响研究

he occurrence of filamentous bulking is associated with specific influent quality and operation schemes. It is still unknown if macromolecular organic substrate might cause filamentous bulking, and if macromolecular organic substrate might result in different dominant filamentous bacteria. In this study, long term effects of macromolecular organic substrate on sludge settleability and the competition between filaments and floc-formers were investigated in order to address these questions. Three lab-scale sequencing batch reactors (SBR) were operated by using particle starch, soluble starch and glucose as the carbon source, respectively. When the storage capability of microorganisms was limited by decreasing of substrate gradient, serious filamentous bulking (SVI>600 mL/g) was caused in the systems with glucose as carbon source. SVI was kept below 300 mL/g in the reactor with soluble starch as carbon source, although a much open, fluffy and porous flocs were formed. Staining reactions and fluorescent in situ hybridization showed that the dominant filaments were type 0092 and type 0041 in particle starch-fed reactor, S. Natans in glucose-fed reactor, N. limicolaⅡ and M. Parvicella in soluble starch-fed reactor. It was demonstrated that various carbon sources would lead to different substrate uptake pathways.