生物氮气/空气混合曝气OLAND-SMBR工艺脱氮

以浸没式膜生物反应器（SMBR）启动OLAND工艺，并对OLAND脱氮工艺性能进行了系统的研究。在OLAND-SMBR工艺运行过程中，采用厌氧氨氧化（ANAMMOX）反应产生的氮气与空气混合曝气的方式，对膜组件进行曝气冲刷以减缓膜污染。实验结果表明，在反应器成功运行70 d过程中，进水总氮负荷最高可达0.4 kg·（m3·d）-1，TN去除率稳定高于81%；当曝气速率从0.025 m3·h-1上升至0.1 m3·h-1（空气泵和循环泵曝气速率均为0.05 m3·h-1）时，膜的使用周期从4 d延长至14 d，生物气+空气混合曝气方式不仅有效地减缓了膜污染，而且为亚硝化细菌的生长提供了所需的溶解氧。

Nitrogen removal of OLAND-SMBR process by using biogas mixed with air aeration

In this study, the successful start-up of an oxygen-limited autotrophic nitrification-denitrification (OLAND) process was conducted in a submerged membrane bioreactor (SMBR). Subsequently, the denitrification performance of the OLAND process was investigated in detail. To avoid significant membrane fouling, nitrogen generated from the anaerobic ammonium oxidation (ANAMMOX) process and air was mixed and utilized as the complete mixing-aeration gas. The results showed that during 70 d of operation of the OLAND-SMBR system, the total nitrogen load could achieve up to 0.4 kg·(m3 ·d)-1, and more than 81% of the total nitrogen removal rate was obtained steadily. When the mixing-aeration rate was increased from 0.025 to 0.1 m3·h-1, the membrane cleaning cycle could be extended from 4 to 14 d, indicating that the mixing-aeration method not only effectively mitigated membrane fouling but also provided the required oxygen source for nitrite bacteria growth.