| Autor: |
Nguyen Duy Binh, Chaiyaporn Imsapsangworn, Nguyen Thi Kim Oanh, Preeda Parkpian, Kare Karstensen, Pham Huy Giao, DeLaune, Ronald D. |
| Rok vydání: |
2015 |
| DOI: |
10.6084/m9.figshare.1485638.v1 |
| Popis: |
Enriched microorganisms in sediment collected from a dioxin contaminated site in Vietnam (Bien Hoa airbase) were used for examining the effectiveness in biological treatment of 2,3,7,8-TCDD in soil. Four bio-treatments were investigated using a sequential anaerobic (17 weeks) followed by an aerobic (6 weeks) incubation. The maximum removal efficiency was approx. 60% even at extremely low pH (approx. 3.6) condition. Surfactant Tween-80 was added to enhance bioavailability of dioxin in two treatments but it appeared to biostimulate methanogens rather than dechlorinators. As a result, the methane production was the highest while the dioxin removal efficiency was the lowest, as compared with the other bio-treatments. Carboxymethylcellulose (CMC) coated on nZVI surface used in two treatments could prevent the direct contact between bacterial cell surface and nZVI which prevented cell death and lysis hence enhancing dioxin removal. The presence of CMC-nZVI in bio-treatments gradually released H2 required for microbiological processes but the amount used in the experiments were likely too high to maintain optimum H2 levels for biostimulating dechlorinators rather than methanogens. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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