粉煤灰对石油污染土壤修复的试验研究

Remediation of petroleum contaminated soil by fly ash

为改善石油污染土壤的环境,促进植物在污染土壤中的生长,通过对石油污染土壤中单独添加粉煤灰、添加粉煤灰＋种植紫花苜蓿、单独种植紫花苜蓿等几种处理,探索粉煤灰添加对土壤中石油烃降解率的影响。结果表明：单独添加的粉煤灰,土壤中的石油烃降解率为4.14%~17.18%;单独种植紫花苜蓿,石油烃降解率为6.6%~30%;添加粉煤灰＋种植紫花苜蓿,降解率为13.4%~60.36%,且3种处理石油烃降解率均随粉煤灰添加逐渐升高。粉煤灰加入量与紫花苜蓿生物量成正相关,提高了紫花苜蓿的发芽率。说明粉煤灰能够较好改善土壤环境,促进紫花苜蓿的生长,从而实现对土壤中石油污染的修复。

To improve soil environment contaminated by petroleum and create a favorable condition for plants,the contaminated soil was treated by several processes. One process was just adding fly ash,another process was adding fly ash and planting alfalfa,the third process was just planting alfalfa. The degradation rate of petroleum hydrocarbon was also analyzed. The results showed that,the degradation rate of the above three processes in order were 4. 14% ~ 17. 18%,6. 6% ~ 30%,13. 4% ~ 60. 36%. The increase of fly ash addition improved the degradation rate of petroleum hydrocarbon. The addition of fly ash and biomass of alfalfa was positively correlated,and improved the germination rate of alfalfa.