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-AO² (MAICAO²) 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 MAICAO² process, particularly the hazardous DOM (antibiotics). The innovative MAICAO² process can effectively remove 99% chemical oxygen demand (COD), 91% total nitrogen (TN) and 91% ammonia (NH₄⁺-N) during the operation time, and the removal efficiencies of COD, TN and NH₄⁺-N in MAICAO² 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 MAICAO² 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.

新鲜渗滤液通常含有高浓度的可降解有机物，这会阻碍传统生物处理的性能，尤其是厌氧反应器。本研究针对新鲜渗滤液生物处理工艺的改进，创造性地提出了微好氧-IC-AO ² (MAICAO ² )工艺，并与传统生物工艺​​进行了比较，优化了操作条件。同时，这项工作研究了MAICAO ²过程中溶解性有机物（DOM），特别是有害DOM（抗生素）的转化规则和分子组成。创新的麦考²该工艺可以在操作时间内有效去除99％的化学需氧量（COD），91％的总氮（TN）和91％的氨（NH ₄ ⁺ -N），以及去除COD，TN和NH ₄ ⁺ -N的效率在麦考²与国际民航组织流程相比，流程增加了大约 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，微曝气可以确保53%以上的小分子有机酸在随后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，提高反硝化效率. 进一步分析表明MAICAO ²可以有效去除不同类别的抗生素（包括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）该工艺的总去除效率为50％。这项工作通过提出微曝气预处理在生物处理过程中的重要性，提出了新鲜渗滤液处理的新方案。