[Carbon/nitrogen Removal and Bacterial Community Structure Change in an A/O Activated Sludge System Under Different Dissolved Oxygen Conditions].
Carbon and nitrogen removal performance and microbial community structure under different dissolved oxygen (DO) conditions (3, 2, 1 and 0. 5 mg . L -1) in an anoxic/oxic (A/O) system were investigated. The results showed that the A/O activated sludge system still had an excellent performance in removing carbon and nutrient under low DO condition (0. 5 mg . L-1). The removal rates of chemical oxygen demand (COD), ammonia (NH4+ -N) and total nitrogen (TN) were 89. 7%, 98. 3% and 88. 0% respectively. The PCR-DGGE analysis showed that the bacterial community structure changed greatly under different DO conditions. However, there was still a high bacterial diversity even at low DO level, which ensured the functional stability of the A/O system. On the basis of the results of the phylogenetic tree, bacterial communities were observed to be very abundant, and Proteobacteria was identified as the dominant bacteria.
Yan
Y
Chen
Guo-hua
GH
Liu
Qiang
Q
Fan
Jun-yan
JY
Wang
Lu
L
Qi
Hong-chen
HC
Wang
D000641:Ammonia / Q000302:isolation & purification; D001419:Bacteria / Q000145:classification* / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000302:isolation & purification*; D058440:Denitrification; D009584:Nitrogen / Q000302:isolation & purification*; D010100:Oxygen / Q000737:chemistry*; D010802:Phylogeny; D020560:Proteobacteria / Q000145:classification / Q000378:metabolism; D012722:Sewage / Q000382:microbiology*
D012722:Sewage; D002244:Carbon; D000641:Ammonia; D009584:Nitrogen; D010100:Oxygen