NO2--N/NH4+-N及COD/NH4+-N对厌氧氨氧化耦合反硝化脱氮除碳的影响

采用序批式反应器-厌氧序批式反应器（SBR-ASBR）组合工艺处理常温低C/N比实际生活污水，通过调控SBR缺氧：好氧时间分别为80min：60min、120min：60min和150min：60min时，实现半亚硝化，将其出水直接泵入ASBR反应器中，考察不同进水NO₂^--N/NH₄⁺-N和COD/NH₄⁺-N对厌氧氨氧化耦合反硝化同步脱氮除碳的影响，并采用响应面法设计正交批次试验.结果表明：在NO₂^--N/NH₄⁺-N为1.55，COD/NH₄⁺-N为4.22时，出水NH₄⁺-N、NO₂^--N和COD的浓度分别为2.79，0.47，38.37mg/L，其去除率分别高达87.56%，98.45%和62.69%.ΔNO₂^--N/ΔNH₄⁺-N为2.23，生成的NO₃^--N的量比理论值小2.47mg/L，厌氧氨氧化和异养反硝化共同完成氮素去除，系统脱氮除碳性能最佳.当NO₂^--N/NH₄⁺-N和COD/NH₄⁺-N分别由0.84增加到1.55和3.24增加到4.22时，厌氧氨氧化和异养反硝化对脱氮贡献率分别由80.40%降至53.33%和19.60%增加到46.67%.NO₂^--N/NH₄⁺-N和COD/NH₄⁺-N对TN和COD去除的正交影响显著，均呈现正相关，R²分别为0.9243和0.9700.

Effect of NO2--N/NH4+-N and COD/NH4+-N on anaerobic ammonia oxidation coupled denitrification nitrogen and carbon removal

The Sequencing Batch Reactor-Anaerobic Sequencing Batch Reactor (SBR-ASBR) combined process was used to treat actual domestic sewage with low C/N ratio at normal temperature,the partial nitritation was achieved by regulating SBR hypoxia: aerobic time was 80min:60min, 120min:60min and 150min:60min respectively. Then the effluent was pumped into the ASBR reactor,investigate the effect of different influent NO₂^--N/NH₄⁺-N and COD/ NH₄⁺-N on removal of nitrogen and carbon by anaerobic ammonia oxidation coupled denitrification, and response surface methodology was used to design orthogonal batch test. The results showed that: NO₂^--N/NH₄⁺-N was 1.55 and COD/NH₄⁺-N was 4.22, the effluent concentrations of NH₄⁺-N, NO₂^--N and COD were 2.79, 0.47 and 38.37mg/L respectively, and their removal rates were as high as 87.56%, 98.45% and 62.69% respectively. ΔNO₂^--N/ΔNH₄⁺-N was 2.23, the quantity of generated NO₃^--N was smaller than the theoretical value by 2.47mg/L, nitrogen was removed by the joint action of anammox and denitrifying, the nitrogen and carbon removal performance of the system was best. When NO₂^--N/NH₄⁺-N and COD/NH₄⁺-N increased from 0.84 to 1.55 and 3.24 to 4.22, respectively, the contribution of anammox and heterotrophic denitrification to nitrogen removal decreased from 80.40% to 53.33% and 19.60% increased to 46.67%. NO₂^--N/NH₄⁺-N and COD/NH₄⁺-N had significant interactive effects on the removal of TN and COD, and both showed a positive correlation, R² were 0.9243 and 0.9700 respectively.