Highly efficient and energy-saving sectional treatment of landfill leachate with a synergistic system of biochemical treatment and electrochemical oxidation on a boron-doped diamond electrode.
In this paper, a synergistic combination of the biochemical treatment and electrochemical oxidation (SBEO) of landfill leachate with sectional treatment on a boron-doped diamond (BDD) electrode is proposed. The first stage involves the synergistic system of biochemical treatment and electrochemical oxidation. Then, the second stage is followed by individual biochemical treatment. Comparisons among the SBEO, electrochemical oxidation, biochemical treatment and biochemical treatment with the pretreatment of electrochemical oxidation are made systematically, which show that this method is both highly efficient and energy-saving. The higher TOC removal and low energy cost on the BDD electrode can be explained by the conversion of the bio-refractory pollutants to biodegradable organics in the electrochemical oxidation process, improving the current efficiency and reducing the energy cost. The treated wastewater is degraded only with biochemical treatment in the second stage, which further improves efficiency and reduced the energy cost.
Zhao
Guohua
G
Department of Chemistry, Tongji University, 1239 Siping Road, 200092 Shanghai, China. g.zhao@tongji.edu.cn
Pang
Yaning
Y
Liu
Lei
L
Gao
Junxia
J
Lv
Baoying
B
D001673:Biodegradation, Environmental; D001895:Boron / Q000737:chemistry*; D003246:Conservation of Energy Resources; D018130:Diamond / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D004785:Environmental Pollutants / Q000032:analysis; D004787:Environmental Pollution / Q000517:prevention & control*; D008401:Gas Chromatography-Mass Spectrometry; D007202:Indicators and Reagents; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical / Q000032:analysis*
D004785:Environmental Pollutants; D007202:Indicators and Reagents; D014874:Water Pollutants, Chemical; D018130:Diamond; D001895:Boron; D010100:Oxygen