ISOLATION AND CHARACTERIZATION OF DOM FROM HEAVY OIL

The XAD-8 macroporous adsorption resin was used to isolate the dissolved organic material from heavy oil wastewater，the TOC，UV254 ，hardness，concentration of Ca2 + and Mg2 + of DOM from heavy oil wastewater and its separated components were measured，and potentiometric titration and infrared spectrum were used to characterize the heavy oil wastewater． The results showed that，DOM from heavy oil wastewater included a hydrophobic part of humic acid( HA) and fulvic acid( FA) mainly，occupied the total TOC 18. 64% and 43. 58%，respectively，the hydrophilic part( HyI) accounted for only 9. 35%，and also a part of organic matter were not isolated． The aromaticity of these fractions followed the order HA ＞ FA ＞ DOM of heavy oil wastewater ＞ HyI． The potentiometric titration indicated that the total organic acidity of these fractions decreased in the order of FA ＞ HA ＞ HyI． The reaction between HA，FA and Ca2 + ，Mg2 + may result in HA and FA adhering to the macroporous weak acid resin，