Abstract
This study aimed to develop a multistage treatment system for highly toxic wastewater named reverse osmosis concentrates of landfill leachate. Therefore, a combination of the ammonia stripping process (ASP), catalytic ozone oxidation process (COP), and heterotrophic nitrification–aerobic denitrification process (HNADP) was proposed and the quality of effluent was evaluated for the concentration of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), and total nitrogen (TN). ASP had moderate removal efficiency of NH4+-N, and TN in the effluent. COP was catalyzed by cerium-supported-activated carbon achieved good performance in disposal of COD. The effluent of HNADP had the most significant removal efficiency of COD, NH4+-N, and TN. As a result, the effluent of combined process successfully met the discharge standards for NH4+-N and TN according to Table 1 of GB 16889-2008 in China. To investigate the microbial mechanism of pollutant removal in HNADP, 16S rRNA high-throughput sequencing was performed and the results suggested that the relative abundance and diversity of microorganisms fluctuated with the changes of COD/TN ratio in HNADP. Truepera and Halomonas were identified as the key genera involved in the simultaneous degradation of COD and nitrogen-containing pollutants, the functional genes (hao, amoA, nirS, and nirK) were predicted in nitrification and denitrification process. Overall, this study demonstrates a feasible multistage system for treatment of concentrates and propose that further explorations of combined techniques may lead to even more satisfactory removal efficiencies.
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All data and materials generated or analyzed during this study are included in this article; the dataset used or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by the National Natural Science Foundation of China [grant numbers 51908099]; the Project of Science and Technology Research Program of Chongqing Education Commission of China [grant number KJQN202001114] and the Project of Chongqing Banan District of China [grant number 2020QC368].
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Qian Zhang: methodology and reviewing, Senwen Tan: writing—original draft, Zhengyi Zhang: data collection and analysis, Chunbo Yuan: investigation, Ziyang Lou and Wei Liu: devices support; all authors contributed significantly to this study.
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Highlights
• Landfill leachate ROC was treated by non-membrane combination process.
• B/C value improved from 0.06 to 0.47 through catalytic ozonation process.
• Salt-tolerant bacteria Truepera played a crucial role in aerobic denitrification.
• Effluent indicators of combination process compliant with corresponding discharge standards.
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Zhang, ., Tan, S., Zhang, Z. et al. Treatment of Landfill Leachate Reverse Osmosis Concentrates by Advanced Oxidation-Heterotrophic Nitrification–Aerobic Denitrification Combination process. Environ Sci Pollut Res 30, 88627–88640 (2023). https://doi.org/10.1007/s11356-023-28504-x
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DOI: https://doi.org/10.1007/s11356-023-28504-x