[Effect of ammonia concentration on the characteristic of aerobic granular sludge].
The effect of ammonia concentration in influent on the characteristic of granular sludge was investigated in the granular SBR. Results indicated that the increase of ammonia concentration could induce filamentous growth. When the loading rate of ammonia was as high as 0.80 kg/(m3 x d), obvious disintegration of granules and washout of sludge were observed. However, in absent of ammonia, aerobic granules could not form either. Moreover, it was found that the increase of ammonia concentration could result in disperse structure, diameter increase, settleability and MLSS reduce of aerobic granular sludge system. The average removals of COD and TP by granular SBR could keep 90% and 70% respectively, and were not influenced by the increase of ammonia. But the activities of nitrification bacteria and denitrification bacteria were restricted seriously by the ammonia concentration increase. When loading rate of ammonia was increased from 0.48 kg/(m3 x d) to 0.80 kg/(m3 x d), the average removal rates of NH4(+) -N and TN reduced to 70% and 50%.
Liu
Hong-Bo
HB
College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Yang
Chang-Zhu
CZ
Pu
Wen-Hong
WH
Lin
Yong-Shan
YS
Lan
Dan
D
D000332:Aerobiosis; D000641:Ammonia / Q000032:analysis*; D019149:Bioreactors / Q000382:microbiology; D009584:Nitrogen / Q000032:analysis; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
D012722:Sewage; D000641:Ammonia; D009584:Nitrogen