Sequencing batch biofilm reactor (SBBR) has the potential to treat hypersaline high-strength nitrogen wastewater by simultaneous nitrification-denitrification (SND). Dissolved oxygen (DO) and aeration modes are major factors affecting pollutant removal. Low DO (0.35–3.5 mg/L) and alternative anoxic/aerobic (A/O) mode are commonly used for municipal wastewater treatment, however, the appropriate DO concentration and operation mode are still unknown under hypersaline environment because of the restricted oxygen transfer in denser extracellular polymeric substances (EPS) barrier and the decreased carbon source consumption during the anoxic phase. Herein, two SBBRs (R1, fully aerobic mode; R2, A/O mode) were used for the treatment of hypersaline high-strength nitrogen wastewater (200 mg/L NH-N, COD/N of 3 and 3% salinity). The results showed that the relatively low DO (2 mg/L) could not realize effective nitrification, while high DO (4.5 mg/L) evidently increased nitrification efficiency by enhancing oxygen transfer in denser biofilm that was stimulated by high salinity. A stable SND was reached 16 days faster with a ∼10% increase of TN removal under A/O mode. Mechanism analysis found that denser biofilm with coccus and bacillus were present in A/O mode instead of filamentous microorganisms, with the secretion of more EPS. and were the dominant genera in both SBBRs, and HN-AD process might assist partial nitrification-denitrification (PND) for highly efficient TN removal in biofilm systems. By using the appropriate operation mode and parameters, the average NH-N and TN removal efficiency could respectively reach 100% and 70.8% under the NLR of 0.2 kg N·m·d (COD/N of 3), which was the highest among the published works using SND-based SBBRs in treatment of saline high-strength ammonia nitrogen (low COD/N) wastewater. This study provided new insights in biofilm under hypersaline stress and provided a solution for the treatment of hypersaline high-strength nitrogen (low COD/N) water.

中文翻译：

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序批式生物膜反应器（SBBR）处理高盐高浓度氮废水时曝气模式和溶解氧对同步硝化反硝化的影响


序批式生物膜反应器（SBBR）具有通过同时硝化-反硝化（SND）处理高盐高浓度氮废水的潜力。溶解氧（DO）和曝气方式是影响污染物去除的主要因素。低溶解氧（0.35–3.5 mg/L）和替代缺氧/好氧（A/O）模式通常用于城市污水处理，然而，由于氧传递受限，在高盐环境下合适的溶解氧浓度和运行模式仍然未知细胞外聚合物（EPS）屏障更致密，缺氧阶段碳源消耗减少。本文采用两台 SBBR（R1，完全好氧模式；R2，A/O 模式）处理高盐高浓度氮废水（200 mg/L NH-N，COD/N 为 3 和 3% 盐度）。结果表明，相对较低的 DO (2 mg/L) 无法实现有效的硝化作用，而高 DO (4.5 mg/L) 通过增强高盐度刺激的致密生物膜中的氧传递，明显提高硝化效率。在 A/O 模式下，达到稳定的 SND 速度要快 16 天，TN 去除率增加约 10%。机理分析发现，A/O模式下存在更致密的球菌和芽孢杆菌生物膜，而不是丝状微生物，并分泌更多的EPS。和 是两种 SBBR 中的优势属，HN-AD 工艺可能有助于部分硝化-反硝化 (PND)，从而在生物膜系统中高效去除 TN。通过采用合适的运行方式和参数，在NLR为0的情况下，NH-N和TN的平均去除效率可分别达到100%和70.8%。2 kg N·m·d（COD/N 为 3），是已发表的使用基于 SND 的 SBBR 处理含盐高浓度氨氮（低 COD/N）废水的文献中最高的。这项研究为高盐胁迫下的生物膜提供了新的见解，并为高盐高浓度氮（低COD/N）水的处理提供了解决方案。