Co-degradation with glucose of four surfactants,CTAB, Triton X-100, SDS and Rhamnolipid,in liquid culture media and compost matrix |
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Authors: | Guangming Zeng Haiyan Fu Hua Zhong Xingzhong Yuan Muxing Fu Wei Wang Guohe Huang |
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Institution: | (1) College of Environmental Science and Engineering, Institute of Environmental protection, Hunan University, Changsha, 410082, China |
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Abstract: | Strengthened biodegradation is one of the key means to treat surfactant pollution in environment, and microorganism and surfactant
have significant effects on degradation. In this paper, co-degradation of CTAB, Triton X-100, SDS and rhamnolipid with glucose
by Pseudomonas aeruginosa, Bacillus subtilis and compost microorganisms in liquid culture media, as well as the degradation of rhamnolipid in compost were investigated.
The results showed that CTAB was recalcitrant to degrade by the three microorganisms and it also inhibited microorganisms
from utilizing readily degradable carbon source. Non-ionic surfactant Triton X-100 could also hardly be degraded, but it was
not toxic to microorganisms and would not inhibit the growth of the microorganisms. Anion surfactant SDS had no toxicity to
microorganisms and could be co-degraded as carbon source with glucose. Biosurfactant rhamnolipid was a kind of particular
surfactant, which had no toxicity and could be degraded by Bacillus subtilis and compost microorganisms, while it could not be utilized by its producing bacterium Pseudomonas aeruginosa. Among these three bacteria, the compost consortium had the strongest degradation capacity on the tested surfactants due
to their microorganisms’ diversity. In compost matrix rhamnolipid could be degraded during composting, but not preferentially
utilized. |
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Keywords: | Biodegradation Composting Microorganism Surfactant |
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