傅立叶变换离子回旋共振质谱揭示了污泥回流水中溶解有机氮（DON）的演变。
Evolution of dissolved organic nitrogen (DON) during sludge reject water treatment revealed by FTICR-MS.
机构信息
School of Environmental and Chemical Engineering, Shanghai Electric Power University, Shanghai 201306, China; College of Environmental Science and Engineering, Institute of Carbon Neutrality, State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China.
College of Environmental Science and Engineering, Institute of Carbon Neutrality, State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China.
出版信息
Sci Total Environ. 2023 Oct 1;893:164944. doi: 10.1016/j.scitotenv.2023.164944. Epub 2023 Jun 17.
This study evaluated the ability to remove dissolved organic matter (DOM), particularly dissolved organic nitrogen (DON), at a molecular level using Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) in a full-scale reject water treatment project comprising three steps of short-cut nitrification and denitrification, two-stage AO, and ultrafiltration membrane system. The results indicated that short-cut nitrification and denitrification were effective in reducing the DON concentration from an average of about 180 mg/L to 43 mg/L. The average molecular weight of DOM showed a decreasing trend from 238 Da to 160 Da. The percentage of nitrogen-containing organic compounds (CHON-DOM), which is the primary component of reject water DOM, increased from 65.79 % to 72.35 %, while the percentage of CHO-DOM decreased from 20.67 % to 15.24 %. The percentage of CHOS-DOM remained stable at 12.21 %-13.54 %. The percentage of protein-DOM decreased from 50.32 % to 18.40 %, while lignin-DOM increased from 36.16 % to 55.88 % and carbohydrate-DOM increased from 2.68 % to 9.74 %. The short-cut nitrification and denitrification and ultrafiltration membrane system both generated more unsaturated, highly aromatic DOM. This study provides insights into the effects of different wastewater treatment processes on the evolution of DOM/DON, which can be useful for effective DON control.
本研究评估了使用傅里叶变换离子回旋共振质谱（FTICR-MS）在一个包括短程硝化反硝化、两级 AO 和超滤膜系统的三级全规模反渗透产水处理项目中从分子水平去除溶解有机物（DOM），特别是溶解有机氮（DON）的能力。结果表明，短程硝化反硝化有效地将 DON 浓度从平均约 180mg/L 降低至 43mg/L。DOM 的平均分子量呈下降趋势，从 238Da 降至 160Da。含氮有机化合物（CHON-DOM）的百分比，即反渗透产水 DOM 的主要成分，从 65.79%增加至 72.35%，而 CHO-DOM 的百分比从 20.67%降至 15.24%。CHOS-DOM 的百分比保持在 12.21%-13.54%。蛋白-DOM 的百分比从 50.32%降至 18.40%，而木质素-DOM 从 36.16%增加至 55.88%，碳水化合物-DOM 从 2.68%增加至 9.74%。短程硝化反硝化和超滤膜系统均产生更多的不饱和、高芳香度 DOM。本研究深入了解了不同废水处理工艺对 DOM/DON 演变的影响，这对于有效控制 DON 具有重要意义。
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