期刊
ENVIRONMENTAL TECHNOLOGY
卷 37, 期 3, 页码 388-398出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2015.1070918
关键词
sequential biodegradation; dioxin; soil; carboxymethylcellulose; nanoscale ZVI
资金
- Hazardous Chemical Management project - Ministry of Foreign Affairs of Norway
- Ministry of Education and Training of Vietnam [322]
- AIT
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-Tetrachlorodibenzo-p-dioxin 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 approximately 60% even at an extremely low pH (approx. 3.6) condition. Surfactant Tween-80 was added to enhance the bioavailability of dioxin in two treatments, but it appeared to biostimulate methanogens rather than dechlorinators. As a result, methane production was the highest while the dioxin removal efficiency was the lowest, as compared with the other bio-treatments. Carboxymethylcellulose (CMC) coated on nanoscale zero valent iron (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 H-2 required for microbiological processes, but the amount used in the experiments were likely too high to maintain optimum H-2 levels for biostimulating dechlorinators rather than methanogens.
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