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Alkanes aerobic degradation

Essential aspects of the aerobic degradation of alkanols have already been covered in the context of the degradation of alkanes. Only one additional comment is added the initial reactions involved... [Pg.309]

The aerobic degradation of these has been covered in the discussion on alkanes and need not be... [Pg.318]

Setti, L., Lanzarini, G., Pifferi, P.G., Spagna, G. (1993) Further research into the aerobic degradation of n-alkanes in a heavy oil by a pure culture of a Pseudomonas sp. Chemosphere 26(6), 1151-1157. [Pg.403]

From an environmental point of view, it therefore appears that the complete degradation of chlorinated alkenes and alkanes will often require the operation of both anaerobic and aerobic steps for example, partial or complete dehalogenation may occur under anaerobic conditions, and aerobic degradation of the partially dechlorinated metabolites such as dichlo-romethane (La Roche and Leisinger 1991) and vinyl chloride (Castro et al. 1992a,b Hartmans and de Bont 1992) may then subsequently take place. The combination of the two activities in a single strain has been exploited in the genetically constructed strain of P. putida and has been discussed above. [Pg.546]

Fig. 16.32 Alkane degradation under aerobic conditions, showing incorporation of oxygen from molecular oxygen into the aliphatic compound, producing a fatty acid. Fatty acids are oxidized further by p-oxidation [H] indicates reducing equivalents that are either required or formed in the reaction step. (Bouwer and Zender 1993)... Fig. 16.32 Alkane degradation under aerobic conditions, showing incorporation of oxygen from molecular oxygen into the aliphatic compound, producing a fatty acid. Fatty acids are oxidized further by p-oxidation [H] indicates reducing equivalents that are either required or formed in the reaction step. (Bouwer and Zender 1993)...
The degradation of sulfur heterocycles in Prudhoe Bay crude oil by aerobic enrichment cultures of marine and soil microorganisms was studies by Fedorak and Westlake (22,22). Figure 4 shows typical results obtained when the aromatic fraction of the oil was analyzed by capillary GC with a sulfur-specific detector. The mixed microbial populations in these enrichments were able to degrade the n-alkanes, pristane, phytane and a number of polycyclic aromatics in this oil (21, 22). There were some similarities between the biodegradability of the sulfur heterocycles in Figure 4 and that of the aromatic hydrocarbons reported by Fedorak and Westlake (21,22). For example, although cultures without N and P addition were able to remove a number of the sulfur heterocycles from the oil, the addition... [Pg.103]

Eckart and co-workers have published a series of papers on laboratory studies of biodesulfurization of petroleum and petroleum fractions. The ability of various aerobic mixed cultures to desulfurize Romashkino crude oil (1.69 wt.% S) was addressed by Eckart et al. (21). After 5 days of incubation at 30°C in sulfur-free mineral medium with oil as sole source of carbon and sulfur, approximately 55% of the total sulfur was recovered in the aqueous phase from two of the most active cultures. In another study, gas oil (1.2 to 2 wt.% S), vacuum distillates (1.8 to 2 wt.% S) and fuel oil (up to 4 wt.% S) were used as sole carbon and sulfur sources for the oil-degrading microorganisms (36). The addition of an emulsifying agent was required to enhance desulfurization. Sulfur removals of up to 20% from the gas oil, 5% from the vacuum distillates, and 25% from the fuel oil were observed after 5 to 7 days of incubation. In a later study (37). approximately 30% of the sulfur was removed from fuel-D-oil by a mixed population of bacteria. The removal of benzothiophene, dibenzothiophene and naphthobenzothiophene was shown by high resolution MS analysis. Hydrocarbon degradation was observed in each of these studies. For example, in the latter study with fuel-D-oil, the decreases in the n-alkane and aromatic content were 59% and 14%, respectively. [Pg.106]


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See also in sourсe #XX -- [ Pg.298 , Pg.299 , Pg.299 , Pg.300 , Pg.301 , Pg.302 ]




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