超越 Anammox 低强度废水处理的适用率：在极短的水力停留时间内激励劳动力,Environmental Science & Technology

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超越 Anammox 低强度废水处理的适用率：在极短的水力停留时间内激励劳动力
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-05-10 , DOI: 10.1021/acs.est.1c05123
Rui Du ₁ , Shenbin Cao ₁ , Rencun Jin ₂ , Xiangchen Li ₁ , Jiarui Fan ₁ , Yongzhen Peng ₁

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_{由于亚硝酸盐（NO 2}^– –N）的生成不稳定，厌氧氨氧化技术在低强度废水处理中的应用仍然具有挑战性。_{以 NO 2}^{– –N 结束的硝酸盐 (NO}₃^– –N) 还原的部分反硝化 (PD)提供了一个有前景的解决方案。然而，关于加速脱氮向厌氧氨氧化结合异养反硝化的实际应用的可行性知之甚少。在这项工作中，PD 与厌氧氨氧化 (PD/A) 系统的耦合展示了超快、高度稳定和令人印象深刻的脱氮性能。使用低浓度进水 [氨 (NH ₄⁺ –N) 和 NO ₃^{–各 50 mg/L}-N] 在低化学需氧量/NO ₃^- -N 比为 2.2 时，水力停留时间可从 16.0 缩短至 1.0 小时。^{实现了1.28 kg N/(m 3} d)的显着脱氮率和94.1%的优异总脱氮效率，远超主流处理的适用能力。由于快速的 NO ₂^- -N 跳跃以及紧随其后的有机碳利用有限的饥荒条件，获得了受刺激的 anammox 的酶促反应活性。这种高速率的 PD/A 系统表现出高效的细菌更新和较短的污泥停留时间。16S rRNA测序揭示了Thauera属的快速生长，这可能是NO不完全还原的原因₃^– –N 到 NO ₂^– –N 和减少的厌氧氨氧化细菌。这为 PD/A 工艺在低强度废水的节能处理中的实际应用提供了新的见解，同时具有较少的土地占用和理想的出水质量。

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Beyond an Applicable Rate in Low-Strength Wastewater Treatment by Anammox: Motivated Labor at an Extremely Short Hydraulic Retention Time

The application of anammox technology in low-strength wastewater treatment is still challenging due to unstable nitrite (NO₂^––N) generation. Partial denitrification (PD) of nitrate (NO₃^––N) reduction ending with NO₂^––N provides a promising solution. However, little is known about the feasibility of accelerating nitrogen removal toward the practical application of anammox combined with heterotrophic denitrification. In this work, an ultrafast, highly stable, and impressive nitrogen removal performance was demonstrated in the PD coupling with an anammox (PD/A) system. With a low-strength influent [50 mg/L each of ammonia (NH₄⁺–N) and NO₃^––N] at a low chemical oxygen demand/NO₃^––N ratio of 2.2, the hydraulic retention time could be shortened from 16.0 to 1.0 h. Remarkable nitrogen removal rates of 1.28 kg N/(m³ d) and excellent total nitrogen removal efficiency of 94.1% were achieved, far exceeding the applicable capacity for mainstream treatment. Stimulated enzymatic reaction activity of anammox was obtained due to the fast NO₂^––N jump followed by a famine condition with limited organic carbon utilization. This high-rate PD/A system exhibited efficient renewal of bacteria with a short sludge retention time. The 16S rRNA sequencing unraveled the rapid growth of the genus Thauera, possibly responsible for the incomplete reduction of NO₃^––N to NO₂^––N and a decreasing abundance of anammox bacteria. This provides new insights into the practical application of the PD/A process in the energy-efficient treatment of low-strength wastewater with less land occupancy and desirable effluent quality.

更新日期：2022-05-10

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