Wang Zhaozhao, Gao Peng, Ji Ying, Zhang Huan, Wu Xinjuan, Ma Jun, Li Simin
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, People's Republic of China.
Hebei Technology Innovation Center for Water Pollution Control and Water Ecological Remediation, Hebei University of Engineering, Handan 056038, People's Republic of China.
R Soc Open Sci. 2021 May 12;8(5):202099. doi: 10.1098/rsos.202099.
In this study, the long-term effects of different salinities on the performance, sludge morphology and shifts in microbial communities were studied in a simultaneous anammox and denitrification (SAD) process at a C/N ratio of 0.5. Stable nitrogen removal efficiencies of 86.96 and 84.58% and nitrogen removal rates of 0.95 and 0.93 kg (m d) could be achieved under low (25 mmol l) and moderate (50 mmol l) salinity, respectively. However, the performance collapsed when the system was exposed to high salinity (100 mmol l). The content of extracellular polymeric substances increased as salinity increased, which resulted in larger sizes of granular sludge under low and moderate salinities. Nevertheless, high salinity shock disintegrated granular sludge, thereby decreasing the average granule size. The Illumina-Miseq sequencing results revealed that was the sole salinity-tolerant AnAOB genus during the entire operation, whereas the main denitrification bacterial genera shifted from under low salinity to , and under high salinity. The results of this study provide a comprehensive and practical evaluation of the SAD process for organic nitrogen-rich saline wastewater treatment.
在本研究中，在碳氮比为0.5的同时厌氧氨氧化和反硝化（SAD）过程中，研究了不同盐度对性能、污泥形态和微生物群落变化的长期影响。在低盐度（25 mmol/L）和中等盐度（50 mmol/L）下，稳定的氮去除效率分别为86.96%和84.58%，氮去除率分别为0.95和0.93 kg/（m³·d）。然而，当系统暴露于高盐度（100 mmol/L）时，性能崩溃。随着盐度增加，胞外聚合物含量增加，这导致在低盐度和中等盐度下颗粒污泥尺寸更大。然而，高盐度冲击使颗粒污泥解体，从而减小了平均颗粒尺寸。Illumina-Miseq测序结果表明，在整个运行过程中，是唯一耐盐的厌氧氨氧化菌属，而主要的反硝化细菌属从低盐度下的转变为高盐度下的、和。本研究结果为富有机氮含盐废水处理的SAD工艺提供了全面而实用的评估。
