Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Bioresour Technol. 2022 Oct;361:127668. doi: 10.1016/j.biortech.2022.127668. Epub 2022 Jul 22.
This study adopted the combination of activated sludge treatment and catalytic ozonation technology to efficiently remove the high concentration of ammonia nitrogen from landfill leachate. Through optimizing the parameters continuously, the COD, NH-N, UV and colority respectively descended to 417.75 ± 6.72 mg/L, 9.77 mg/L, 1.98 ± 0.04 and 40 times, and 3D fluorescence also reduced significantly within 14 days. Target genes of AOB-amoA, nxrA, napA, nirS and nosZ analysis indicated that ammonia-oxidizing bacteria, nitrated bacteria, and denitrifying bacteria played a key role on nitrogen removal, aerobic denitrifying bacteria was dominated especially. The nitrogen removal process was as follows: catalytic ozonation converted nitrogen-containing organic matter into NH-N, then NH-N was converted into NO-N and NO-N with the action of ammonia oxidation, nitrification and catalytic ozonation. Finally, the denitrification microorganisms transformed NO-N or NO-N to N. Therefore, this coupled process realized the nitrogen removal effectively from landfill leachate.
本研究采用活性污泥处理与催化臭氧化技术相结合，有效去除垃圾渗滤液中的高浓度氨氮。通过不断优化参数，COD、NH3-N、UV 和色度分别下降至 417.75±6.72mg/L、9.77mg/L、1.98±0.04 和 40 倍，3D 荧光也在 14 天内显著降低。AOB-amoA、nxrA、napA、nirS 和 nosZ 靶基因分析表明，氨氧化菌、硝化菌和反硝化菌在脱氮过程中起关键作用，特别是好氧反硝化菌占主导地位。氮去除过程如下：催化臭氧化将含氮有机物转化为 NH3-N，然后在氨氧化、硝化和催化臭氧化的作用下，NH3-N 转化为 NO2-N 和 NO3-N。最后，反硝化微生物将 NO2-N 或 NO3-N 转化为 N。因此，该耦合工艺有效地实现了垃圾渗滤液中的氮去除。
