The biodegradation of most PAHs with high molecular weight is carried out by means of cometabolism. The development of the theory about cometabolic degradation is reviewed in this paper, and the achievements on the co...The biodegradation of most PAHs with high molecular weight is carried out by means of cometabolism. The development of the theory about cometabolic degradation is reviewed in this paper, and the achievements on the cometabolic degradations of PAHs are also summarized. It is demonstrated that glucose, biphenyl, organic acids and mineral oil could be used as cometabolic substrate to enhance the degradation rate of PAHs, and there are complex interactions in the microbiological degradation process among different PAHs. Some low molecular PAHs could serve as cometabolic substrate, which could also be used to enhance the transformation rate of high molecular weight recalcitrant PAHs. To achieve the cometabolic degradation of the PAHs in the soils, the following problems must be solved: the screening out of efficient degradative strains, the selection of the appropriate cometabolic substrate, the addition of surfactant if necessary and the optimization of operational parameters with the contaminated soils. These problems are the important parts of the project for the cometabolic degradation of PAHs in the soils.展开更多
The analysis on microbiological ecology for four types of oil contaminates soils showed that the bacteria utilizing the oil as carbon sources increase,wheras the fugi become less .Zooloea and Bacillu are the dominant ...The analysis on microbiological ecology for four types of oil contaminates soils showed that the bacteria utilizing the oil as carbon sources increase,wheras the fugi become less .Zooloea and Bacillu are the dominant bacteria ; Mocor and Cunninghamella ,and Fursarium are the dominant fungi streptomyces take the superiority among the actinomyces.The anaiysis on esterase activity showed that the microbes above mentioned have abilies of degrading esters. The biodeg radationrates are 55.45%,56.74%,38.37% and 45.19%respectively,after 53 days,the biodegradation rate can be increased by 12.6% when the dominant microbes are added.展开更多
文摘The biodegradation of most PAHs with high molecular weight is carried out by means of cometabolism. The development of the theory about cometabolic degradation is reviewed in this paper, and the achievements on the cometabolic degradations of PAHs are also summarized. It is demonstrated that glucose, biphenyl, organic acids and mineral oil could be used as cometabolic substrate to enhance the degradation rate of PAHs, and there are complex interactions in the microbiological degradation process among different PAHs. Some low molecular PAHs could serve as cometabolic substrate, which could also be used to enhance the transformation rate of high molecular weight recalcitrant PAHs. To achieve the cometabolic degradation of the PAHs in the soils, the following problems must be solved: the screening out of efficient degradative strains, the selection of the appropriate cometabolic substrate, the addition of surfactant if necessary and the optimization of operational parameters with the contaminated soils. These problems are the important parts of the project for the cometabolic degradation of PAHs in the soils.
文摘The analysis on microbiological ecology for four types of oil contaminates soils showed that the bacteria utilizing the oil as carbon sources increase,wheras the fugi become less .Zooloea and Bacillu are the dominant bacteria ; Mocor and Cunninghamella ,and Fursarium are the dominant fungi streptomyces take the superiority among the actinomyces.The anaiysis on esterase activity showed that the microbes above mentioned have abilies of degrading esters. The biodeg radationrates are 55.45%,56.74%,38.37% and 45.19%respectively,after 53 days,the biodegradation rate can be increased by 12.6% when the dominant microbes are added.
