关键词: 稠油废水, 低温等离子体, 蒸发, 预处理, 结垢

Abstract: In order to improve distilled water quality so that it can be used as oil field boiler feeding water and avoid scale formation during the evaporation process，the technology of non-thermal plasma (NTP) was employed in this research to pre-treat heavy oil wastewater before evaporation. First the wastewater was sprayed into NTP reactor tube with atomizers and contacted with ion & free radicals, and then it was sent to the evaporator. It was found that after pretreatment，the contents of SiO2，hardness，metal contents，oil and salinity of pretreated wastewater were reduced. Accordingly，all of these indexes of distilled water from wastewater evaporation decreased too；and for the left concentrated solution which was around 40 times concentrated，suspended solids in the solution increased greatly；while scale formation on the evaporator surface was inhibited. When compared the quality of distilled water with the requirements on oil field injection boiler feedwater，it was found that the quality of distilled water from wastewater evaporation met all the requirements except for the oil content. Low-temperature plasma，as a pretreatment technology，will improve quality of feedwater and prevent fouling during evaporation，providing a more effecitve，convenient way for recovering wastewater water.

Key words: heavy oil wastewater, non-thermal plasma, evaporation, pretreatment, scale formation