Abstract：
Industrial wastewater discharged into sewer systems is often characterized by high nitrate contents and low C/N ratios, resulting in high treatment costs when using conventional activated sludge methods. This study introduces a partial denitrification-anammox (PD/A) granular process to address this challenge. The PD/A granular process achieved an effluent TN level of 3.7 mg/L at a low C/N ratio of 2.3. Analysis of a typical cycle showed that the partial denitrification peaked within 15 min and achieved a nitrate-to-nitrite transformation ratio of 86.9%. Anammox, which was activated from 15 to 120 min, contributed 86.2% of the TN removal. The system exhibited rapid recovery from post-organic shock, which was attributed to significant increases in protein content within TB-EPS. Microbial dispersion and reassembly were observed after coexistence of the granules, with Thauera (39.12%) and Candidatus Brocadia (1.25%) identified as key functional microorganisms. This study underscores the efficacy of PD/A granular sludge technology for treating low-C/N nitrate wastewater.
摘要：
排放到下水道系统的工业废水通常具有高硝酸盐含量和低C/N比的特点。导致使用常规活性污泥法时处理成本高。本研究引入了部分反硝化-厌氧氨氧化（PD/A）颗粒工艺来应对这一挑战。PD/A颗粒工艺在2.3的低C/N比下实现了3.7mg/L的流出物TN水平。对典型循环的分析表明，部分反硝化在15分钟内达到峰值，硝酸盐与亚硝酸盐的转化率为86.9％。Anammox,从15到120分钟激活，贡献了86.2%的TN去除。该系统从有机休克后迅速恢复，这归因于TB-EPS中蛋白质含量的显着增加。颗粒共存后观察到微生物分散和重组，Thauera（39.12％）和CandidatusBrocadia（1.25％）被确定为关键的功能微生物。这项研究强调了PD/A颗粒污泥技术处理低C/N硝酸盐废水的有效性。
