氧化剂对土壤中石油污染物去除率的影响

以FeSO_4-柠檬酸为催化剂,探讨了不同氧化剂的类型、浓度、与催化剂的比例等因素对土壤中石油污染物去除率的影响。实验结果表明:各氧化剂体系的石油去除率大小顺序为KMnO_4CaO_2≥H_2O_2K_2S_2O_8;随着反应时间的延长,各体系的石油去除率均呈现出先快速增涨、再缓慢增加后略有降低的趋势;在氧化剂浓度相同条件下,H_2O_2体系和Na_2S_2O_8体系的石油去除率分别比对照增加了145.5%~238.7%和112.6%~167.5%;在催化剂用量相同条件下,H_2O_2体系和Na_2S_2O_8体系达到最高石油去除率时的n(氧化剂)∶n(催化剂)分别为50∶1和100∶1;H_2O_2体系对残油族组分的去除率大小顺序为非烃芳烃饱和烃沥青质。

Effects of oxidants on removal of petroleum pollutants from soil

The effects of type,concentration and mole ratio to catalyst of different oxidants on removal of petroleum pollutants in soil were studied using FeSO₄-citric acid as catalyst. The experimental results indicated that：The order of petroleum removal rate of each oxidant system was KMnO₄ > CaO₂ ≥H₂O₂ > K₂S₂O₈;With the extending of reaction time,the petroleum removal rate of each system showed a trend of increasing rapidly at first,then increasing slowly and decreasing slightly later;Under the same oxidant concentrations,the petroleum removal rate of H₂O₂ system and Na₂S₂O₈ system was higher than that of the control system by 145.5%-238.7% and 112.6%-167.5%,respectively;Under the same catalyst amount,the petroleum removal rate of H₂O₂ system and Na₂S₂O₈ system reached the highest level when n（oxidant）∶n（catalyst）was 50∶1 and 100∶1,respectively;The order of removal rate of group components in the residual oil by H₂O₂ system was non-hydrocarbon>aromatic hydrocarbon>saturated hydrocarbons>asphaltenes.