| Abstrakt: |
Landfill leachate concentrates is the waste solution trapped by nanofiltration/reverse osmosis (NF/RO) membrane in the biochemical effluent of landfill leachate. It has high content of salt and dissolved organic matter (DOM), especially refractory organic matter. Electrochemical oxidation of landfill leachate concentrates on Ti/RuO2-Ir/O2 anode, the electrolysis time and current density and plate distances was studied on the effects of the oxidation results. The results showed that, under the optimal conditions with initial pH value 7.8, current density 8 A/dm2, plate distances 1 cm, and electrolysis time 4 h, the chroma, COD, ammonia nitrogen and Cl- removal rates were 100%, 100%, 98% and 52%respectively. UV-vis spectrum analysis showed that the aromatization degree and relative molecular mass and polymerization degree decreased of DOM in the landfill leachate concentrates after electrolysis treatment. 3D-excitation emission matrix fluorescence spectra (3D-EEMFS) showed that humic acid was oxidized to humic acid with simpler structure and smaller relative molecular mass and soluble microbial degradation by-products in the landfill leachate concentrates after electrolysis treatment. FTIR analysis showed that the absorption intensity of organic compounds in the landfill leachate concentrates decreased and most organic compounds were oxidized and degraded after electrolysis treatment. [ABSTRACT FROM AUTHOR] |
