A robust and cost-effective integrated process for nitrogen and bio-refractory organics removal from landfill leachate via short-cut nitrification, anaerobic ammonium oxidation in tandem with electrochemical oxidation.
A cost-effective process, consisting of a denitrifying upflow anaerobic sludge blanket (UASB), an oxygen-limited anoxic/aerobic (A/O) process for short-cut nitrification, and an anaerobic reactor (ANR) for anaerobic ammonia oxidation (anammox), followed by an electrochemical oxidation process with a Ti-based SnO2-Sb2O5 anode, was developed to remove organics and nitrogen in a sewage diluted leachate. The final chemical oxygen demand (COD), ammonia nitrogen (NH4(+)-N) and total nitrogen (TN) of 70, 11.3 and 39 (all in mg/L), respectively, were obtained. TN removal in UASB, A/O and ANR were 24.6%, 49.6% and 16.1%, respectively. According to the water quality and molecular biology analysis, a high degree of anammox besides short-cut nitrification and denitrification occurred in A/O. Counting for 16.1% of TN removal in ANR, at least 43.2-49% of TN was removed via anammox. The anammox bacteria in A/O and ANR, were in respective titers of (2.5-5.9)×10(9) and 2.01×10(10)copy numbers/(gSS).
Beijing Institute of Petrochemical Technology, Beijing 102617, China; State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Li-Na
LN
Wu
Beijing Key Laboratory of Bioinspired Energy Materials and Devices, Beihang University, Beijing 100191, China.
Da-Wei
DW
Liang
Beijing Institute of Petrochemical Technology, Beijing 102617, China.
Ying-Ying
YY
Xu
Beijing Institute of Petrochemical Technology, Beijing 102617, China.
Ting
T
Liu
State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: pyz@bjut.edu.cn.
Yong-Zhen
YZ
Peng
State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Jie
J
Zhang
D064751:Ammonium Compounds / Q000737:chemistry / Q000378:metabolism*; D000693:Anaerobiosis; D001419:Bacteria / Q000235:genetics / Q000378:metabolism; D000068476:Beijing; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D003362:Cost-Benefit Analysis; D058440:Denitrification; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D058465:Nitrification; D009584:Nitrogen / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D060888:Real-Time Polymerase Chain Reaction; D012722:Sewage; D064091:Waste Disposal Facilities / Q000191:economics; D014865:Waste Disposal, Fluid / Q000191:economics / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000191:economics
D064751:Ammonium Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical; D009584:Nitrogen; D010100:Oxygen
Anaerobic ammonia oxidation (anammox); Electrochemical oxidation; Landfill leachate; Short-cut nitrification; Upflow anaerobic sludge blanket reactor (UASB)