| With the development of science and technology, improvement of people’s living standards, changes oflife style, and great spread of the scale of China’s urbanization and industrial and agricultural patterns,garbage, industrial and agricultural waste production increased rapidly, and great changes of theircomposition have taken place. In China, taking the actual conditions of developing countries into account,sanitary landfill still as a major technology in terms of waste disposal. On the one hand, this technology hasbeen already quite mature, so easy to take measure; on the other hand, more effectively to deal with theproblem of excess garbage with lower costs can save costs. However, there is a serious shortcoming of thesanitary landfill, a lot of landfill leachate generated every year which greatly do harm to the environmentand human. As a high concentration organic wastewater, its high concentration of Chemical OxygenDemand (COD) and ammonia, high levels of metal ions and complex components, its poor biodegradability and large fluctuations in water quality make the leachate treatment quite difficult. Thus, the study ofcharacterization method about refractory organicsin landfill leachate becomes particularly important.From this issue, this article analysised the advantages and disadvantages of traditional representationand three-dimensional fluorescence spectroscopy when they were used as characterization methods;including the analysis on traditional characterization methods of Chemical Oxygen Demand (COD),Biochemical oxygen demand (BOD5) and BOD5/COD, Total organic carbon (TOC),Biodegradabledissolved organic carbon (BDOC) and DOC/DOC (dissolved organic carbon), and the application of thethree-dimensional fluorescence spectroscopy to characterize sewage inquiry. In the experiment, throughanalyzing the water quality changes by three-dimensional fluorescence spectroscopy between raw waterand treated water samples, changes in water quality before and after ozone oxidation, the change of waterquality after ozone oxidation then SBR treatment and comparison between raw water and sewage to fullyclarify the role of characterization with three-dimensional fluorescence. Dissolved organic matter (DOM)obtained from landfill leachates was separated into hydrophobic organic matter (HPI), hydrophobic organicacids (HPO-A), transition of hydrophilic organic acids (TPI-A), hydrophobic neutral organic (HPO-N) andtransition hydrophilic neutral organic (TPI-N) five fractions after using a two column array of AmberliteXAD-8and XAD-4resins in series. Research on water quality changes of landfill leachate DOMcomponents before and after Sequencing batch reactor (SBR) treatment, other means of characterization oflandfill leachate refractory organics and synchronous fluorescence spectra before and after SBR processingto raw water sample and its components in the DOM. The former by analyzing the characteristics peakfluorescence intensity of the five-component and the content of the corresponding organic pollutant beforeand after the SBR treatment processing, directly proved that the three-dimensional fluorescencespectroscopy as the characterize of landfill leachate recalcitrant organics is intuitive, comprehensive andworkable besides its superiority; The latter two formers supported and confirmed this from theexperimental phenomena and results. That’s to say the results show that EEM maps change of the DOM and five fractions isolated from raw water and raw water after SBR treatment are consistent with that ofsynchronous fluorescence intensity and chemical oxygen demand (COD).Our findings suggest that fluorescence can be used as a rapid and sensitive tracer of sewage treatmenteffect. Further refinement of the technique should provide a relatively rapid and intuitional method forcharacterizing the variation of water quality of the landfill leachates with different treatments. |
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