A/O1/O2生物膜系统污染物降解特性

将传统A/O工艺的好氧单元分为两段，在各反应器中设置填料，构建了A/O₁/O₂生物膜系统，对锦纶废水进行处理，研究了污染物在系统各段的降解情况，并借助红外光谱分析方法探讨了污染物中官能团的变化规律。结果表明，A/O₁/O₂生物膜系统处理锦纶废水的效果良好，COD、NH₄⁺-N和TN的平均去除率分别为92.70%、85.35%和58.85%。当有机负荷从1.64～4.61 kg/(m³·d) 变化时，A段、O₁段和O₂段中COD、NH₄⁺-N和TN的降解变化趋势均不相同。对于COD的去除，A段、O₁段和O₂段的平均贡献率分别为63.08%、29.72%和4.16%；对于NH₄⁺-N的去除，O₁段和O₂段的平均贡献率分别为23.80%和75.99%；对于TN的去除，A段、O₁段和O₂段的平均贡献率分别为74.97%、19.77%和4.09%。经A段缺氧、O₁段和O₂段好氧处理后，废水中酰胺化合物、氨基酸和脂肪族化合物含量减少，出现了无机的NH₄⁺、NO₃^－、HCO₃^－以及碳水化合物。

Characteristics of substrates degradation in A/O1/O2 biofilm system

The aerobic reactor of A/O process was separated into two segments and each of them was installed with fiber packing to form an A/O₁/O₂ biofilm system. In the A/O₁/O₂ biofilm system，substrates degradation characteristics of nylon wastewater in each reactor were investigated. Furthermore，infrared spectroscopy was used for analyzing substrates decomposition. Good performance of A/O₁/O₂ biofilm system was achieved，and average removal efficiencies of COD，NH₄⁺-N and TN were 92.70%，85.35% and 58.85% respectively. As organic loadings varied from 1.64 kg/(m³·d) to 4.61 kg/(m³·d)，different removal characteristics of COD，NH₄⁺-N and TN were observed in A，O₁ and O₂ reactors. For COD removal，average contribution percentages of A，O₁ and O₂ reactors were 63.08%，29.72% and 4.16% respectively. For NH₄⁺-N removal，average contribution percentages of O₁ and O₂ reactors were 23.80% and 75.99% respectively. For TN removal，average contribution percentages of A，O₁ and O₂ reactors were 74.97%，19.77% and 4.09% respectively. Investigation on the IR of each wastewater samples demonstrated that in the progress of substrates degradation，amino acid，amide and aliphatic compounds decreased，but NH₄⁺，NO₃^－，HCO₃^－ and carbohydrate increased.