Energy saving achieved by limited filamentous bulking sludge under low dissolved oxygen.
Limited filamentous bulking caused by low dissolved oxygen (DO) was proposed to establish a low energy consumption wastewater treatment system. This method for energy saving was derived from two full-scale field observations, which showed pollutants removal would be enhanced and energy consumption could be reduced by at least 10% using limited filamentous bulking. Furthermore, preliminary investigation including the abundance evaluation and the identification of filamentous bacteria demonstrated that the limited filamentous bulking could be repeated steadily in a lab-scale anoxic-oxic reactor fed with domestic wastewater. The sludge loss did not occur in the secondary clarifier, while COD and total nitrogen removal efficiencies were improved by controlling DO for optimal filamentous bacterial population. Suspended solids in effluent were negligible and turbidity was lower than 2 NTU, which were distinctly lower than those under no bulking. Theoretical and experimental results indicated the aeration consumption could be saved by the application of limited filamentous bulking.
Guo
Jian-Hua
JH
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Peng
Yong-Zhen
YZ
Peng
Cheng-Yao
CY
Wang
Shu-Ying
SY
Chen
Ying
Y
Huang
Hui-Jun
HJ
Sun
Zhi-Rong
ZR
D000332:Aerobiosis; D000641:Ammonia / Q000032:analysis; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology; D002681:China; D019411:Clinical Laboratory Techniques; D003246:Conservation of Energy Resources / Q000379:methods*; D017404:In Situ Hybridization, Fluorescence; D009566:Nitrates / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D010100:Oxygen / Q000302:isolation & purification / Q000378:metabolism*; D015203:Reproducibility of Results; D012722:Sewage / Q000382:microbiology*; D012995:Solubility; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*
D009566:Nitrates; D009573:Nitrites; D012722:Sewage; D014874:Water Pollutants, Chemical; D000641:Ammonia; D010100:Oxygen