Bacterial surface properties fundamentally affect the stability and aggregation of anammox granular sludge. The variation in the surface properties of the granular sludge at different salinities were investigated to further clarify the effect of salinity on the aggregation of anammox granular sludge in this study. High anammox activity was obtained at a salinity of 30 g/L NaCl, and the average removal efficiency of NH₄⁺N, NO₂⁻-N and TN reached 91.9% ± 1.4%, 97.3% ± 0.4% and 86.3% ± 0.9%, respectively. The sludge particle size in Reactor 1 (with 0 g/L NaCl as control) and Reactor 2 (with 0, 15 and 30 g/L NaCl) increased from 1.62 ± 0.16 mm and 1.59 ± 0.12 mm to 2.71 ± 0.23 mm and 2.44 ± 0.19 mm, respectively, during total operation. PN gradually decreased from 30.58 ± 2.5 mg/g to 18.11 ± 2.1 mg/g, and PS sharply increased from 1.48 ± 0.09 mg/g to 10.52 ± 0.50 mg/g with the increase in salinity. The PS/PN ratio of extracellular polymeric substances (EPS) rapidly increased from 0.05 to 0.58 with an increase of salinity. Fourier transform infra-red spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results showed that salinity inhibited the expression of anammox sludge hydrophobicity by changing surface groups. Binding between multivalent metal ions and EPS was significantly hindered by the high Na⁺ concentration. The results of this study provided a better understanding of the effect of salinity on the stability and aggregation of anammox granular sludge in saline wastewater treatment.

细菌的表面性质从根本上影响厌氧氨氧化颗粒污泥的稳定性和聚集。研究了不同盐度下颗粒污泥表面性质的变化，以进一步阐明盐度对厌氧性厌氧颗粒污泥聚集的影响。以30g / L的NaCl，和的NH平均去除效率的盐度，得到高活性ANAMMOX ₄ ⁺ N，NO ₂ ^--N和TN分别达到91.9％±1.4％，97.3％±0.4％和86.3％±0.9％。反应器1（使用0 g / L NaCl作为对照）和反应器2（使用0、15和30 g / L NaCl）中的污泥粒径从1.62±0.16 mm和1.59±0.12 mm增加到2.71±0.23 mm和2.44在整个操作过程中，分别为±0.19毫米。随着盐度的增加，PN从30.58±2.5 mg / g逐渐降低至18.11±2.1 mg / g，PS从1.48±0.09 mg / g急剧增加至10.52±0.50 mg / g。随着盐度的增加，细胞外聚合物（EPS）的PS / PN比从0.05迅速增加到0.58。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）结果表明，盐度通过改变表面基团抑制了厌氧氨氧化污泥疏水性的表达。⁺浓度。这项研究的结果更好地了解了盐度对盐废水中厌氧氨氧化颗粒污泥的稳定性和聚集的影响。