[Effects of pretreatment methods on corncob as carbon source for denitrification].

The corncob was pretreated by 1.5% NaOH, 1% H2SO4, 1.5% H2O2 and alkaline hydrogen peroxide (caustic soda solution with 1.5% H2O2) combined with ultraviolet radiation. And the characteristics of carbon released, denitrification and bio-attachment capability of using pretreated corncob as carbon source for denitrification were studied in carbon release and denitrification experiments in laboratory scale. The results showed that the denitrification efficiency and the utilizability of the carbon released by the corncob pretreated by alkali or alkaline hydrogen peroxide were significantly enhanced. Especially, for the alkali pretreatment method, the nitrate removal rate could still maintain higher than 90% after 41 days of denitrification experiments. Therefore, the alkali pretreatment method could improve the carbon release performance of the corncob and is beneficial for microbial adsorption and carbon source utilization.