Abstract
Municipal landfill leachate (MLL) contamination in surface water is a critical global issue due to the high concentration of toxic organics and recalcitrants. The biological treatment of MLL is ineffective due to an elevated concentration of ammoniacal nitrogen, which restricts the production of the recalcitrant degrading laccase enzyme. In this context, integrating an external laccase-anchored carbon catalyst (LACC) matrix system with the microbial system could be an efficient strategy to overcome the drawbacks of conventional biological MLL treatment technologies. In the present study, the LACC matrix was synthesized by utilizing nanoporous activated carbon (NAC) functionalized ethylene diamine (EDA) and glutaraldehyde (GA) (GA/EDA/NAC) matrix for the anchoring of laccase. The maximum anchoring capacity of laccase onto GA/EDA/NAC was achieved to be 139.65 U/g GA/EDA/NAC at the optimized anchoring time, 60 min; pH, 5; temperature, 30 °C, and mass of GA/EDA/NAC, 300 mg and was confirmed by Fourier transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscope (SEM), and X-ray Diffraction (XRD) analyses. Further, the mechanistic study revealed the involvement of covalent bonding in the anchoring of laccase onto the functionalized surface of the GA/EDA/NAC matrix. The adsorption isotherm and kinetics of laccase anchoring onto the GA/EDA/NAC matrix were performed to evaluate its field-level application. Subsequently, the sequential microbial system (I-stage bacterial treatment followed by II-stage fungal treatment) and III-stage LACC matrix system could effectively reduce the COD by 94.2% and phenol by 92.36%. Furthermore, the Gas Chromatography-Mass Spectrophotometry (GC–MS) and FT-IR analyses confirmed the effective degradation of organic compounds and recalcitrants by the integrated microbial and LACC matrix system. The study suggested that the application of the LACC matrix system has resulted in the complete treatment of real-time MLL by overcoming the negative interference of elevated ammoniacal nitrogen concentration. Thus, the integrated microbial and LACC matrix approach could be considered to effectively treat the MLL without any secondary pollution generation.
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Acknowledgements
Maseed Uddin acknowledge the Department of Science and Technology, Ministry of Science and Technology, Government of India for providing the INSPIRE fellowship [DST/INSPIRE Fellowship/2019/IF190897] to carry out the research. Ramani Kandasamy. sincerely thank the Department of Science and Technology, Ministry of Science and Technology, New Delhi, for funding the project under the Scheme "Scheme for Young Scientists and Technologists (SYST)-Science for Equity and Empowerment Division (SEED)”; Project No: SP/YO/2019/1360(G).
Funding
Department of Science and Technology, Ministry of Science and Technology, Government of India, DST/INSPIRE Fellowship/2019/IF190897, Maseed Uddin, SP/YO/2019/1360(G), Ramani K.
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Uddin, M., Sriram, S.S., Krishna, K. et al. A novel integrated microbial and laccase-anchored carbon catalyst system for the effective treatment of toxic organic and recalcitrant-rich municipal landfill leachate. Carbon Lett. (2024). https://doi.org/10.1007/s42823-024-00706-4
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DOI: https://doi.org/10.1007/s42823-024-00706-4