School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.
School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China.
Bioresour Technol. 2023 Aug;382:129220. doi: 10.1016/j.biortech.2023.129220. Epub 2023 May 20.
Marine anammox bacteria (MAB) have promising nitrogen removal performance in high saline wastewater treatment. Nevertheless, the impact resulting from moderate and low salinities on MAB is still unclear. Herein, MAB were applied to treat saline wastewater from high to moderate and low salinities for the first time. Independent of salinities (35-3.5 g/L), MAB consistently exhibited good nitrogen removal performance, and maximum total nitrogen removal rate (0.97 kg/(m·d)) occurred at 10.5 g/L salts. More extracellular polymeric substances (EPSs) were secreted by MAB-based consortia to resist hypotonic surroundings. However, a sharp EPS decrease was accompanied by the collapse of MAB-driven anammox process, and MAB granules disintegrated due to long-term exposure to salt-free environment. The relative abundance of MAB varied from 10.7% to 15.9% and 3.8% as salinity decreased from 35 to 10.5 and 0 g/L salts. These findings will provide practical implementation of MAB-driven anammox process treating wastewater with different salinities.
海洋厌氧氨氧化菌（MAB）在高盐废水处理中具有良好的脱氮性能。然而，中低盐度对 MAB 的影响尚不清楚。本研究首次将 MAB 应用于处理从高盐到中低盐度的含盐废水。MAB 能够在不同盐度（35-3.5 g/L）下保持良好的脱氮性能，在 10.5 g/L 盐度下最大总氮去除率（0.97 kg/（m·d））。基于 MAB 的联合体分泌更多的胞外聚合物（EPS）来抵抗低渗环境。然而，随着盐度从 35 降至 10.5 和 0 g/L，EPS 急剧减少伴随着 MAB 驱动的厌氧氨氧化过程的崩溃，并且由于长期暴露在无盐环境中，MAB 颗粒解体。当盐度从 35 降至 10.5 和 0 g/L 时，MAB 的相对丰度分别从 10.7%降至 15.9%和 3.8%。这些发现将为 MAB 驱动的厌氧氨氧化工艺处理不同盐度的废水提供实际应用。
