Department of Environmental Engineering, Suleyman Demirel University, 32260 Isparta, Turkey; University-Industry-Public Collaboration, Research-Development-Application Centre, Kahramanmaras Sutcu Imam University, 46050 Kahramanmaras¸ Turkey.
Department of Bioengineering and Sciences, Kahramanmaras Sutcu Imam University, 46050 Kahramanmaras Turkey.
Sci Total Environ. 2021 Jul 1;776:145919. doi: 10.1016/j.scitotenv.2021.145919. Epub 2021 Feb 18.
Landfill leachate (LFL) is one of the most serious environmental problems due to the high concentrations of toxic and hazardous matters. Although several physical, chemical, methods have been tested, biological processes and single or multiple-stage combinations of them have been receiving more attention due to their cost-effective and environmentally-friendly manner. The present work recommended coupling of conventional single-stage A/O with moving bed biofilm reactor and membrane bioreactor (AnoxMBBR/AeMBR) for LFL treatment. The system performance was evaluated for 233 d under varying nitrate concentrations (100-1000 mgNO-N/L), sludge retention time (SRT) (30-90 d), and HRT (24-48 h) in AnoxMBBR, and constant SRT (infinite) and HRT (48 h) in the AeMBR. The best system performances were observed at 1000 mgNO-N/L concentration, SRT of 90 d and HRT of 48 h, and the average removal efficiencies of chemical oxygen demand (COD), ammonia nitrogen (NH-N), and nitrate‑nitrogen (NON) were 74.2%, 99.7%, and 89.1%, respectively. Besides, the AeMBR was achieved above 99% NH-N removal and not adversely affected by varying operation conditions of AnoxMBBR. A slight increase in selected phthalic acid ester (PAE) concentrations (diethyl phthalate (DEP), di (2-Ethylhexyl) phthalate (DEHP), diisononyl phthalate (DINP)) was detected in the AnoxMBR, and complete PAEs removal was attained in the AeMBR. Mg, Al, Si, Na, Fe was detected by SEM-EDX analyses in both biofilm of AnoxMBBR and the cake layers of AeMBR. Nitrobacter and Nitratireductor which showed a relatively high abundance played an important role in the removal of NH-N and COD in LFL. The results confirmed that the proposed sequence is efficient for COD removal, nitrogen removal, and PAEs being an acceptable treatment for landfill leachates.
垃圾渗滤液（LFL）是最严重的环境问题之一，因为其中含有高浓度的有毒有害物质。尽管已经测试了几种物理、化学方法，但由于其具有成本效益和环保的特点，生物过程及其单级或多级组合已受到更多关注。本研究推荐将传统的单级 A/O 与移动床生物膜反应器和膜生物反应器（AnoxMBBR/AeMBR）相结合用于 LFL 处理。在 AnoxMBBR 中，在硝酸盐浓度（100-1000mgNO-N/L）、污泥停留时间（SRT）（30-90d）和水力停留时间（HRT）（24-48h）不断变化的情况下，以及 AeMBR 中保持 SRT（无限）和 HRT（48h）不变的条件下，对该系统进行了 233d 的性能评估。在硝酸盐浓度为 1000mgNO-N/L、SRT 为 90d 和 HRT 为 48h 的最佳系统性能下，化学需氧量（COD）、氨氮（NH-N）和硝酸盐氮（NON）的平均去除效率分别为 74.2%、99.7%和 89.1%。此外，AeMBR 实现了 NH-N 去除率超过 99%，并且不受 AnoxMBBR 操作条件变化的不利影响。在 AnoxMBBR 中检测到邻苯二甲酸酯（PAE）浓度略有增加（邻苯二甲酸二乙酯（DEP）、邻苯二甲酸二（2-乙基己基）酯（DEHP）、邻苯二甲酸二异壬酯（DINP）），并且在 AeMBR 中完全去除了 PAEs。通过 SEM-EDX 分析，在 AnoxMBBR 的生物膜和 AeMBR 的饼层中均检测到 Mg、Al、Si、Na、Fe。在 LFL 中，硝化菌和亚硝酸盐还原菌的相对丰度较高，它们在 NH-N 和 COD 的去除中发挥了重要作用。结果证实，所提出的序列对于 COD 去除、氮去除和 PAEs 去除是有效的，是垃圾渗滤液的一种可接受的处理方法。
