Variation characteristics of dissolved organic matter(DOM) in coal-to-liquids wastewater during biological treatment process

Abstract

The anaerobic/aerobic(A/O) treatment process was an important process for linking pre-treatment and deep treatment of coal-to-liquids(CTL) wastewater.Therefore, in this study, the variation characteristic of DOM in A/O treatment process of CTL wastewater has been analyzed in deep.The purpose of this paper was to evaluate the treatment efficiency of A/O process, clarify the variation characteristics of DOM, select the characteristic pollutants after A/O treatment and provide theoretical basis and pertinent suggestions for subsequent deep treatment.Water samples were analyzed by GC/MS, resin fractionation, fluorescence spectroscopy and PARAFAC model.GC/MS experimental analysis revealed that A/O process could partially remove DOM in CTL wastewater.The DOM fractionation results showed that wastewater were mainly hydrophobic substances before and after A/O treatment, but the compositions changed.The fluorescence spectrum analysis results showed that the A/O process could effectively remove organics with fluorescence response in humic acid and fulvic acid region in DOM.On the other hand, EEM conjunction with PARAFAC model could precisely monitor organic pollutants evolutions.In summary, the A/O process could effectively remove the DOM from the coal-to-liquid wastewater, and the removal of phenol and esters should be strengthened in the subsequent deep treatment.

Keywords

• coal-to-liquids wastewater
• gc/ms analysis
• three-dimensional fluorescence
• domain integral
• parallel factor analysis(parafac)