Formation of aerobic granules and their PHB production at various substrate and ammonium concentrations.
Aerobic granular sludge rich in polyhydroxybutyrate (PHB) was cultivated in a sequencing batch reactor (SBR) by seeding anaerobic granular sludge. The PHB content in aerobic granules was investigated and the experimental results reveal that both influent chemical oxygen demand (COD) and ammonium concentrations had a significant effect on the morphological characteristics and the PHB production of the aerobic granular sludge. At a COD and ammonium concentration of 750 mg/L and 8.5mg/L, respectively, the PHB content of the granules reached 44%, but their poor settling ability, as evidenced by a high sludge volume index, was observed. This was attributed to the outgrowth of filamentous bacteria on the granule surface. However, an increase in the ammonium concentration resulted in an elevated sludge concentration and a decrease in the PHB content in the granules. In this case, the aerobic granular sludge with a regular and compact structure was formed. The results suggest that, through controlling the COD and ammonium concentrations in the influent, the PHB-rich aerobic granular sludge with good settling ability could be cultivated.
Fang
Fang
F
Department of Chemistry, University of Science and Technology of China, Hefei, China.
Liu
Xian-Wei
XW
Xu
Juan
J
Yu
Han-Qing
HQ
Li
Yong-Mei
YM
D001420:Bacteria, Aerobic / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D006885:Hydroxybutyrates / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D010316:Particle Size; D011091:Polyesters / Q000378:metabolism*; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology*; D000094122:Polyhydroxybutyrates
D006885:Hydroxybutyrates; D010100:Oxygen; D011091:Polyesters; D000644:Quaternary Ammonium Compounds; D012722:Sewage; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates