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題 名 | Feasibility Study of Biostimulation with Biosurfactant Addition=以生物界面活性劑提升柴油生物分解菌活性可行性研究 |
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作 者 | 鄭幸雄; 劉保文; 馬志強; 黃良銘; | 書刊名 | 中國環境工程學刊 |
卷 期 | 16:3 民95.05 |
頁 次 | 頁175-181 |
分類號 | 445.6 |
關鍵詞 | 生物界面活性劑; 生物刺激; 生物復育; Surfactin; Rhamnolipid; Biosurfactant; Biostimulation; Bioremediation; |
語 文 | 英文(English) |
中文摘要 | Surfactin與rhamnolipid乃兩種不同結構的生物界面活性劑。為了解此兩種生物界面活性劑,是否適於在實際柴油污染廠址,以生物刺激(biostimulation)加速生物復育(bioremediation)的速率和效率。因此本研究以生物攝氧速率(oxygen uptake rate)以及生物質量(biomass)的生長速率來評估柴油分解菌在添加不同種類和不同濃度的生物界面活性劑後的生物活性。研究結果發現添加surfactin在初期九小時內攝氧速率為16 mg-O₂ L¯¹ h¯¹,較未添加組別的8.1 mg-O₂ L¯¹ h¯¹來的快。在實驗經過九小時後,則所有添加組別攝氧速率皆低於未添加組別。rhamnolipid的添加分成兩組結果:1.以mineral salt(MS)medium培養Pseudomonas aeruginos所生產的rhamnolipid只有在添加9 mg L¯¹的組別在攝氧速率16.3 mg-O₂ L¯¹ hr¯¹和總攝氧量1,922 mg-O₂ L¯¹表現優於未添加組別11.2 mg-O₂ L¯¹h¯¹及1,213 mg-O₂ L¯¹ h¯¹;2.以Luria-Bertani(LB)medium培養生產的rhamnolipid則所以添加組別的表現皆比未添加組別來的優異。添加以LB medium所培養的rhamnolipid對微生物生長量提升顯著優於添加以MS medium所培養的rhamnolipid,前者最多可比未添加組提升3.4倍,而後者最多只能提升1.6倍。pH值在rhamnolipid添加情形下對微生物生長量相當敏感,過酸(5.7)及過鹼(8.0)均抑制其生長量。若進一步控制pH值在接近中性的範圍內即pH = 6.2-7.5且使實驗過程中pH值沒有太大的變動,微生物生長速率更可提升至10.2-13.9 mg L¯¹h¯¹。 |
英文摘要 | This study explored the biostimulation with addition of surfactin and rhamnolipid biosurfactants. Indigenous microorganisms enriched from a diesel-contaminated soil sample were tested. Oxygen uptake rates and biomass increments (mixed-liquid volatile suspended solids) were selected to determine the microbial activity under the conditions of various biosurfactant additions. Different concentrations of surfactin were added to the enriched indigenous with nutrient and diesel as the only carbon source. However, possibly due to the antibiotic characteristics, the addition of surfactin (16-224 mg L-1) caused inhibition of the microbial activity, which was proved by the declining oxygen uptake rate (OUR) through the 150 testing hours. On the other hand, it was found, the initial OUR with the surfactin addition was significantly higher (16 mg O2 L-1 h-1) than the group without the surfactin (8.1 mg O2 L-1 h-1). Addition of 9 mg L-1 rhamnolipid was found to be able to raise the OUR, which was relatively higher than the group without the addition. In order to optimize the performance of rhamnolipid, the rhamnolipid producer Pseudomonas aeruginosa J4 was cultured by mineral salt (MS) and Luria-Bertani (LB) medium separately. The results indicated that rhamnolipid cultured with LB medium can enhance the biomass growth rate 3.4 fold over the non-addition, while the MS medium could only help to stimulate 1.6 fold of growth rate over the non-addition. Also, with the addition, pH value of 7.2 resulted in the highest bioactivity, which produced growth rate about two times over that in pH 5.7 and pH 8.0. Culture medium and pH value are two important factors when rhamnolipid is added to enhance the diesel bioremediation. |
本系統中英文摘要資訊取自各篇刊載內容。