| Autor: |
Lo, Waihung, Chua, Hong, Yu, Peter H. F., Sin, Shirley Ngai |
| Předmět: |
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| Zdroj: |
Science of the Total Environment. 2/5/2001, Vol. 266 Issue 1-3, p221. 0p. |
| Abstrakt: |
Xenobiotic branched carboxylic acids (BCAs) discharged by industriesare often persistent in biological wastewater treatment systems and end up in water and sediments. In this study, the degradation of 12 typical BCAs in an anaerobic environment of river sediment was studiedin vitro using enrichment shake-flask cultures. The anaerobic consortium taken from the river sediment, comprising BCA-degrading and methane-producing genera, degraded BCAs with tertiary carbons through beta-oxidation, followed by methanogenesis mechanisms. The maximum cell densities in the cultures using BCAs as the sole carbon source rangedbetween 5.0 and 6.0x 105 cells/ml. The maximum degradation rates were between 5.0 and 8.5x 10-3 mmol/h. The consortium could not degrade BCAs with quaternary carbons. The degree of branching at the alpha or beta position along the carbon chain interfered with the beta-oxidation mechanisms. These BCAs would accumulate in the sediment and significantly affect the cycling of organic carbon and nutrients. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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