铁基质强化新型功能性化粪池高效处理黑水的试验

以铁基质生物载体为核心，将物理、生物和化学方法结合，对化粪池进行功能强化，实现黑水的原位深度处理.探究了溶解氧（DO）和碳氮比（C/N）等因素对黑水中污染物降解的影响，并在最佳运行参数下考察了氮素在系统中的转化机制.结果表明，当C/N为7.3~8.4时，好氧生物铁基质载体池DO为2.3~2.7mg/L时，系统氨氮（NH₄⁺-N）、总氮（TN） 、COD和总磷（TP）的平均去除率分别可达90.74%、85.81%、92.65%和95.78%；当进水C/N降至3.3~4.2时，系统NH₄⁺-N、TN、COD和TP的平均去除率仍可维持在81.16%、76.62%、93.87%和94.75%.铁基质生物载体内电解作用显著强化了化粪池内TN的脱除、COD的氧化和TP的固定.氮素转化机制分析表明，内电解与反硝化菌的耦合强化了反硝化作用，降低了反硝化过程对有机碳源的需求，强化了低C/N条件下TN、TP的脱除.

Experimental study on effective treatment of fecal sewagebya novel functional septic tank strengthened by iron-based bio-carriers

Based on the addition of iron-based bio-carrier, the function of septic tank was strengthened by the related physicochemical and biochemical reactions, achieving the advanced treatment of fecal sewage. The effect of dissolved oxygen (DO) and carbon to nitrogen ratio (C/N) on the removal of pollutants in the fecal sewage was investigated. Under the obtained optimal operation condition, the transformation mechanism of nitrogen was further explored. The results showed that average NH₄⁺-N, TN, COD and TP removals of 90.74%, 85.81%, 92.65% and 95.78% were achieved, respectively, at the influent C/N ratio of 7.3~8.4 and optimal DO of 2.3~2.7mg/L in the aerobic iron-based bio-carriers pool. When reducing the influent C/N ratio from 3.3~4.2, the system could still maintain average NH₄⁺-N, TN, COD and TP removals of 81.16%, 76.62%, 93.87%and 94.75%, respectively. Mechanism analysis indicated that the addition of iron-based bio-carriers markedly strengthened TN removal, COD degradation and TP immobilizationof thedeveloped septic tank. Analysis on nitrogen transformation confirmed that denitrification was enhanced by the internal electrolysis and denitrifying bacteria coupled denitrifying process, which reduced the organicconsumption during denitrification. the developed novel functional septic tank achieved efficient of TN and TP removal from the low-C/N fecal sewage.