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Effect of C/N/P ratio and nonionic surfactants on polychlorinated biphenyl biodegradation 总被引:5,自引:0,他引:5
Rojas-Avelizapa N.G. Rodríguez-Vázquez R. Saval-Bohorquez S. Alvarez P.J.J. 《World journal of microbiology & biotechnology》2000,16(4):319-324
This work investigated whether polychlorinated biphenyl (PCB) removal from a highly contaminated soil (7000-p.p.m.) could be enhanced by manipulating the carbon to nitrogen to phosphorus (C/N/P) ratio, and by nonionic surfactant addition. A Box–Behnken statistical experimental design was used to evaluate the combined effect of surfactant type, surfactant concentration, and C/N/P ratio in a relatively short treatment period (35 days). The variable with the greatest effect on PCB degradation was the type of surfactant used. Higher PCB removal efficiencies (39–60%) were obtained with Tween 80 (compared to Tergitol NP 10 and Triton X-100). This was attributed to its lower critical micelle concentration. Higher C/N/P ratios (increased by biphenyl addition) significantly stimulated the soil heterotrophic activity without enhancing PCB removal. This suggests that nonionic surfactants have a greater potential to enhance bioremediation of PCB-contaminated soil than efforts to enhance the soil heterotrophic activity through nutrient and analogue substrate addition. 相似文献
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