氧化剂对土壤中石油污染物去除率的影响

Effects of oxidants on removal of petroleum pollutants from soil

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_4>CaO_2≥H_2O_2>K_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。

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 fi rst,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.