Abstract：Activated carbon fibers(ACF)were prepared by using nitric acid and hydrogen peroxide to obtain modified ACF, i.e. ACFmod, then the surface area and surface functional groups of the were characterized. The results showed that the specific surface area and average pore volume of the ACFmod were decreased, but the average pore size was increased, and the surface quinone content was more than the ACF. In the sodium sulfide(Na2S)reductive degradation of methyl orange system, the added carbon materials accelerated the degradation of methyl orange, and ACFmod had the best promoting effect. In the anaerobic sludge degradation system, the carbon materials added accelerated biodegradation of methyl orange, further ACFmod was more favorable than ACF. By operating the UASB reaction system, the methyl orange removal and COD removal rates with added ACFmod were higher than those without ACFmod, especially, the decolorization rate of methyl orange and COD removal rate were greater than 90% and 79%, respectively. This fact suggests that ACFmod has a favorable effect on degradation of methyl orange in the UASB system.
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