A coupled system of half-nitritation and ANAMMOX for mature landfill leachate nitrogen removal.
A coupled system of membrane bioreactor-nitritation (MBR-nitritation) and up-flow anaerobic sludge blanket-anaerobic ammonium oxidation (UASB-ANAMMOX) was employed to treat mature landfill leachate containing high ammonia nitrogen and low C/N. MBR-nitritation was successfully realized for undiluted mature landfill leachate with initial concentrations of 900-1500 mg/L [Formula: see text] and 2000-4000 mg/L chemical oxygen demand. The effluent [Formula: see text] concentration and the [Formula: see text] accumulation efficiency were 889 mg/L and 97% at 125 d, respectively. Half-nitritation was quickly realized by adjustment of hydraulic retention time and dissolved oxygen (DO), and a low DO control strategy could allow long-term stable operation. The UASB-ANAMMOX system showed high effective nitrogen removal at a low concentration of mature landfill leachate. The nitrogen removal efficiency was inhibited at excessive influent substrate concentration and the nitrogen removal efficiency of the system decreased as the concentration of mature landfill leachate increased. The MBR-nitritation and UASB-ANAMMOX processes were coupled for mature landfill leachate treatment and together resulted in high effective nitrogen removal. The effluent average total nitrogen concentration and removal efficiency values were 176 mg/L and 83%, respectively. However, the average nitrogen removal load decreased from 2.16 to 0.77 g/(L d) at higher concentrations of mature landfill leachate.
a College of Architecture and Civil Engineering , Beijing University of Technology , Beijing , People's Republic of China.
Yun
Y
Li
a College of Architecture and Civil Engineering , Beijing University of Technology , Beijing , People's Republic of China.
Jun
J
Li
a College of Architecture and Civil Engineering , Beijing University of Technology , Beijing , People's Republic of China.
Baihang
B
Zhao
a College of Architecture and Civil Engineering , Beijing University of Technology , Beijing , People's Republic of China.
Xiujie
X
Wang
a College of Architecture and Civil Engineering , Beijing University of Technology , Beijing , People's Republic of China.
Yanzhuo
Y
Zhang
a College of Architecture and Civil Engineering , Beijing University of Technology , Beijing , People's Republic of China.
Jia
J
Wei
a College of Architecture and Civil Engineering , Beijing University of Technology , Beijing , People's Republic of China.
Wei
W
Bian
D019149:Bioreactors; D058440:Denitrification; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical
D014874:Water Pollutants, Chemical; D009584:Nitrogen
ANAMMOX; Mature landfill leachate; half-nitritation; membrane bioreactor; nitrogen removal