- 期刊
受油品污染場址之整治實務案例
A Case Study of Remediation for a Site Impacted by Fuel Oil
摘要
台灣某工廠因地下輸油管線破損，導致油品滲入土壤。經查廠內雖於油品洩漏後立即阻斷洩漏源頭，然而已有部分之洩漏油品隨著鄰近之雨水排放涵管流入大海。而已滲入土壤的油品，則隨著地下水流布，已造成未飽和層土壤中總石油碳氫化合物(total petroleum hydrocarbons, TPHs)濃度超過污染管制標準。本場址遭受污染後，首先在污染團地下水下游方向挖設截流溝，再利用抽水方式進行水力控制避免地下水污染物之擴散。後續根據污染調查結果，依污染物特性、污染團的分布及水文地質等特徵，規劃以(1)設置截流溝進行水力控制並回收浮油、(2)培養現地微生物進行微生物分解、(3)高污染區域進行排客土作業及(4)利用過硫酸鈉氧化處理挖出之污染土壤等組合工法進行整治作業。本場址受污染的面積約1,360 m^2，污染土壤量約460 m^3，整治工作歷經約2年6個月的時間完成污染改善，其中藉由水力控制配合浮油回收作業，總共回收855 L之浮油。另於現地培養微生物致使地下水中之微生物數量增加，且經由菌種鑑定分析發現本場址現地具有Nocardioides sp.及Dietzia sp.MJ624等兩株重油分解菌，可促進TPHs的分解。針對高污染土壤進行排客土所挖出之受污染土方，則於廠內空地以過硫酸鈉氧化劑進行處理，污染土壤經化學氧化處理後，土壤 中TPH_(C10~C40)濃度由2,810 mg/kg降至26.5 mg/kg，降解率達99%。現地之土壤及地下水品質經由驗證結果確認污染物濃度皆低於管制標準，證實本場址污染整治工作已獲得成效，土壤及地下水品質達改善目標。
並列摘要
Soils at a plant were impacted by fuel oil due to pipe leaks, and partial floating oil was found to flow through storm drainage into the ocean. Therefore, emergency responses were undertaken with the associated tasks including interception, recovery, and cleanup of the floating oil. The source of contamination was eliminated by replacement of the leaking pipe. According to the site investigation, soil in the vadose zone near the source area was impacted by fuel oil, regulated as total petroleum hydrocarbons (TPHs), with concentrations exceeding the Taiwan Environmental Protection Administration (EPA) Soil Pollution Control Standards. The following remedial actions were conducted: an interception trench was placed on the eastern border of the contamination source using the hydraulic control method to prevent the spreading of contaminated plume. Based on the soil characteristics, distribution of soil contamination, and geo-hydrologic properties of groundwater, several remedial works were planned to (1) use the interception trench for the hydraulic control and oil recovery, (2) provide proper nutrients to stimulate growth of indigenous oil degrading microbes in place, (3) remove the impacted soil and backfill with new clean soil, and (4) apply persulfate oxidation to treat the impacted soil that was excavated onsite. The area of concern was 1,360 m^2 and the impacted soil volume was about 460 m^3. It took 30 months to accomplish the planned remediation work. There were 855 liters of oil recovered through hydraulic interception. Additionally, the fuel oil degrading microbes identified onsite were Nocardioides sp. and Dietzia sp.MJ624, which were capable of expediting biodegradation process. The heavily impacted soil was excavated and treated by persulfate oxidation. The concentration of TPHC_(10~C40) in the excavated soil was reduced from 2,810 mg/kg to 26.5 mg/kg, and 99% removal efficiency was achieved. Both soil and groundwater qualities were analyzed, and found to meet the Taiwan EPA Control Standards, and thus the remediation goal was successfully achieved.