Characterization of a novel micro-pressure swirl reactor for removal of chemical oxygen demand and total nitrogen from domestic wastewater at low temperature.
A novel micro-pressure swirl reactor (MPSR) was designed and applied to treat domestic wastewater at low temperature by acclimating microbial biomass with steadily decreasing temperature from 15 to 3 °C. Chemical oxygen demand (COD) was constantly removed by 85% and maintained below 50 mg L-1in the effluent during the process. When the air flow was controlled at 0.2 m3h-1, a swirl circulation was formed in the reactor, which created a dissolved oxygen (DO) gradient with a low DO zone in the center and a high DO zone in the periphery for denitrification and nitrification. 81% of total nitrogen was removed by this reactor, in which ammonium was reduced by over 90%. However, denitrification was less effective because of the presence of low levels of oxygen. The progressively decreasing temperature favored acclimation of psychrophilic bacteria in the reactor, which replaced mesophilic bacteria in the process of treatment.
Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun, 130117, China.|Changchun Institute of Technology, Changchun, 130117, China.
Qingkai
Q
Ren
Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun, 130117, China.|Biorefining Research Institute, Lakehead University, Thunder Bay, ON, P7B 5E1, Canada.
Yang
Y
Yu
Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun, 130117, China. papermanuscript@126.com.
Suiyi
S
Zhu
Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun, 130117, China.|Changchun Institute of Technology, Changchun, 130117, China.
Dejun
D
Bian
Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun, 130117, China.|Changchun Institute of Technology, Changchun, 130117, China.
Mingxin
M
Huo
Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun, 130117, China.
Dandan
D
Zhou
Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun, 130117, China.
Hongliang
H
Huo
D000641:Ammonia / Q000032:analysis; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D044822:Biodiversity; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D058645:Denaturing Gradient Gel Electrophoresis; D009566:Nitrates / Q000032:analysis; D009573:Nitrites / Q000032:analysis; D009584:Nitrogen / Q000302:isolation & purification*; D010100:Oxygen / Q000032:analysis; D011312:Pressure; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*
D000641:Ammonia; D009566:Nitrates; D009573:Nitrites; D009584:Nitrogen; D010100:Oxygen; D062065:Wastewater
COD removal; Domestic wastewater treatment; Low temperature; Micro-pressure swirl reactor; Nitrogen removal