The effect of C/N on simultaneous nitrification and denitrification (SND) of domestic sewage was investigated in a biological activated carbon (BAC) reactor. The results showed that C/N had no significant effect on COD removal, but had sig-nificant effects on the removal of NH+4-N and total nitrogen (TN). With the increase of C/N from 3. 2 to 7. 2, the removal effi-ciency of NH+4-N increased from 81% to 91% , and the removal efficiency of TN increased from 35% to 68% . However, with increasing C/N to 9. 1, the removal efficiencies of NH+4-N and TN decreased to 87% and 51% , respectively. The optimum C/N for the bioreactor reactor to dispose of the actual wastewater was 7. 2. Compared with the traditional SBR activated sludge re-actor, the BAC reactor can rely on activated carbon to achieve dissolved oxygen regionalization, which can contribute to the deni-trification process.%在生物活性碳(BAC)反应器中探究了C/N对实际生活污水同步硝化反硝化的影响.结果表明C/N对化学需氧量(COD)的去除影响不明显,然而对NH+4-N和总氮( TN)的去除影响较显著.随C/N由3.2升高至7.2,NH+4-N的去除效率由81%升高至91% ,TN的去除效率也由35%升高至68% .然而继续升高C/N至9. 1,NH+4-N和TN的去除效率却分别下降至87%和51% .生物活性碳反应器处置实际污水的最佳C/N为7.2.较传统SBR活性污泥反应器,BAC反应器能够依赖活性碳实现溶解氧区域化,从而有助于反硝化过程.
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