Photoelectrochemical treatment of landfill leachate in a continuous flow reactor.
Leachate from a municipal landfill site, which has been treated by biological process, was treated by photoelectrochemical oxidation in a pilot scale flow reactor, using DSA anode and UV light irradiation. At a current density of 67.1mA/cm(2) and 2.5h reaction time, the removal rates achieved were for 74.1% COD, 41.6% for TOC, and 94.5% for ammonium in the electrolysis process with UV light irradiation. In comparison, the removal rates of COD, TOC, and ammonium were decreased in the individual electrolysis process, respectively. The increase induced by the UV light irradiation was analyzed. The removal rates increased with the increase of current densities in the photoelectrochemical process. Combined with UV-vis spectra and gas chromatography-mass spectroscopy analysis, it is believed that the organic contaminants were efficiently mineralized into small molecular acids. At the meantime, the concentrations of metal ions in the landfill leachate were largely reduced.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
Xu
X
Zhao
Jiuhui
J
Qu
Huijuan
H
Liu
Chunxia
C
Wang
Shuhu
S
Xiao
Ruiping
R
Liu
Pengju
P
Liu
Huachun
H
Lan
Chengzhi
C
Hu
D019149:Bioreactors; D002849:Chromatography, Gas / Q000379:methods; D004563:Electrochemistry / Q000379:methods*; D004572:Electrolysis; D004867:Equipment Design; D007477:Ions / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods; D008670:Metals / Q000737:chemistry; D010777:Photochemistry / Q000379:methods*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012037:Refuse Disposal; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013997:Time Factors; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods
D007477:Ions; D008670:Metals; D000644:Quaternary Ammonium Compounds