Utilization of Triton X-100 and polyethylene glycols during surfactant-mediated biodegradation of diesel fuel

作者：Wyrwas Bogdan; Chrzanowski Lukasz^*; Lawniczak Lukasz; Szulc Alicja; Cyplik Pawel; Bialas Wojciech; Szymanski Andrzej; Holderna Odachowska Aleksandra

来源：Journal of Hazardous Materials, 2011, 197: 97-103.

DOI：10.1016/j.jhazmat.2011.09.060

• Biodegradation
• Diesel oil
• PEG
• Triton X-100

The hypothesis regarding preferential biodegradation of surfactants applied for enhancement of microbial hydrocarbons degradation was studied. At first the microbial degradation of sole Triton X-100 by soil isolated hydrocarbon degrading bacterial consortium was confirmed under both full and limited aeration with nitrate as an electron acceptor. Triton X-100 (600 mg/l) was utilized twice as fast for aerobic conditions (t(1/2) = 10.3 h), compared to anaerobic conditions (t(1/2) = 21.8 h). HPLC/ESI-MS analysis revealed the preferential biodegradation trends in both components classes of commercial Triton X-100 (alkylphenol ethoxylates) as well as polyethylene glycols. The obtained results suggest that the observed changes in the degree of ethoxylation for polyethylene glycol homologues occurred as a consequence of the 'central fission' mechanism during Triton X-100 biodegradation. Subsequent experiments with Triton X-100 at approx. CMC concentration (150 mg/l) and diesel oil supported our initial hypothesis that the surfactant would become the preferred carbon source even for hydrocarbon degrading bacteria. Regardless of aeration regimes Triton X-100 was utilized within 48-72 h. Efficiency of diesel oil degradation was decreased in the presence of surfactant for aerobic conditions by approx. 25% reaching 60 instead of 80% noted for experiments without surfactant. No surfactant influence was observed for anaerobic conditions.

• 出版日期2011-12-15