School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Shanghai Institute for Design & Research on Environmental Engineering Co., Ltd, Shanghai 200040, China; Shanghai Environmental Sanitation Engineering Design Institute Co., Ltd, Shanghai 200001, China.
Sci Total Environ. 2021 Oct 1;789:147939. doi: 10.1016/j.scitotenv.2021.147939. Epub 2021 May 23.
Fresh leachate is commonly featured with high concentrations of degradable organic matters, which can impede the performance of traditional biological treatment, especially the anaerobic reactor. Aiming at improving the biological treatment process of fresh leachate, this study creatively proposed a microaerobic-IC-AO (MAICAO) process and compared it with traditional biological process, then optimized the operating conditions. Meanwhile, this work investigated the transformation rules and molecular compositions of dissolved organic matters (DOM) during MAICAO process, particularly the hazardous DOM (antibiotics). The innovative MAICAO process can effectively remove 99% chemical oxygen demand (COD), 91% total nitrogen (TN) and 91% ammonia (NH-N) during the operation time, and the removal efficiencies of COD, TN and NH-N in MAICAO process increased approximately 2%, 14% and 13% compared to ICAOAO process. Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) confirmed that microaeration could ensure over 53% small molecular organic acids degrade before the subsequent anaerobic reaction so the system could resist the high concentration organic matters stress and improve the denitrification efficiency. Further analysis showed that different categories of antibiotics (including 6 sulfonamides, 4 tetracyclines, 2 macrolides, 4 quinolones and 2 chloramphenicols) could be effectively removed by MAICAO process with the total removal efficiency of 50%. This work proposed a new scenario for fresh leachate treatment by proposing the importance of the microaeration pretreatment during the biological treatment process.
新鲜渗滤液通常具有高浓度的可生物降解有机物，这会阻碍传统生物处理方法的效果，尤其是厌氧反应器。为了改善新鲜渗滤液的生物处理过程，本研究创新性地提出了一种微氧-内循环厌氧氨氧化（MAICAO）工艺，并与传统生物工艺进行了比较，然后对操作条件进行了优化。同时，本工作还研究了 MAICAO 工艺中溶解有机物（DOM）的转化规律和分子组成，特别是有害 DOM（抗生素）。创新的 MAICAO 工艺在运行过程中可以有效去除 99%的化学需氧量（COD）、91%的总氮（TN）和 91%的氨氮（NH-N），与 ICAOAO 工艺相比，MAICAO 工艺中 COD、TN 和 NH-N 的去除效率分别提高了约 2%、14%和 13%。电喷雾电离傅里叶变换离子回旋共振质谱（ESI FT-ICR MS）证实，微氧可以确保 53%以上的小分子有机酸在后续的厌氧反应之前降解，从而使系统能够抵抗高浓度有机物的压力，提高脱氮效率。进一步的分析表明，MAICAO 工艺可以有效去除 6 种磺胺类、4 种四环素类、2 种大环内酯类、4 种喹诺酮类和 2 种氯霉素类不同类别的抗生素，总去除效率为 50%。本研究通过提出在生物处理过程中微氧预处理的重要性，为新鲜渗滤液处理提出了一个新的方案。
