曝气量及COD浓度对SBBR同步硝化反硝化效能的影响

Simultaneous Nitrification and Denitrification in SBBR:Its Performances Affected by Aeration Amount and COD Concentration

采用悬浮球形填料,以人工模拟生活污水为原水,研究了曝气量及进水COD浓度对序批式膜生物反应器（SBBR）内同步硝化反硝化（SND）效能的影响。试验结果表明,在0.025~0.070 m3/h的曝气量范围内,SBBR的COD及NH4＋-N去除率都能达到90%左右,COD和NH4＋-N的降解过程具有时序性,即曝气初期以COD降解为主,待COD降解基本完成后,NH4＋-N降解速率才明显提高。SBBR内同步硝化反硝化效率与曝气量成反比,即曝气量越低,TN去除率越高;当曝气量为0.025 m3/h时,TN去除效率最高,达到73.26%。在200~700 mg/L的进水COD浓度范围内,COD去除率始终维持在90%左右,TN去除率随着进水COD浓度增加呈现先升高后降低的变化趋势。

A bench scale sequencing bio-film batch reactor （SBBR） for treating domestic wastewater was developed Ibr the purpose of studying how the simultaneous nitrification and denitrification （SND） is affected by aeration amount and COD concentration of wastewater. The experimental results showed that degradation of NH4＋-N mainly took place following the approximate finish of COD removal and the SND efficiency was in inverse proportion to aeration amount, i.e., SND reached to its maximum, namely 73.26%, when the aeration rate decreased to 0.025 m3/h. Additionally, COD removal could maintain around 90% when COD in the influent was within the range of 200-700 mg/L; however TN removal increased at first and then tended to decline with the increases of COD concentration of the influent.