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Use of vinasse and coffee waste as chelating agent of photo-Fenton landfill leachate treatment

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Abstract

This research studies the use of vinasse (VS) coming from Pisco and caffeic acid (Caa) from solid coffee waste as chelating agents of this process, to carry out a photo-Fenton process using UVc lamps of 254-nm wavelength for 60 min, at the natural pH of the landfill leachate (8.9). Without the chelating agent, there was a removal of UV 254 and COD of 54.2% and 54.7%, respectively, when the photo-Fenton reaction was carried out at pH 3; at pH 6, the removal of UV 254 and COD was 13.1% and 39.2%, respectively, and at pH 8.9, the elimination of UV 254 and COD was 10.8% and 16.1%, respectively. When Caa was used in the landfill leachate (LL) for the photo-catalytic processes carried out at pH 8.9, a removal of 24.1%, 43.0%, and 47.4% of UV 254 was obtained using 5 mg/L, 50 mg/L, and 100 mg/L of Caa. The removal of UV 254 was 27.3%, 30.7%, and 36.3% using 5 mg/L, 50 mg/L, and 100 mg/L of VS, respectively, and the removal of COD was 32.2%, 35.4%, and 39.2% using 5 mg/L, 50 mg/L, and 100 mg/L of VS, respectively. When Caa was used in the LL at pH 8.9, the concentration of total Fe went from 37.5 to 33.2, from 40.2 to 36.8, and from 45.2 to 42.1, using 5 mg/L, 50 mg/L, and 100 mg/L of caffeic acid, respectively. Using VS in the LL at pH 8.9, the concentration of total Fe along the run went from 35.1 to 32.2, from 39.4 to 34.8, and from 42.1 to 40.2, using 5 mg/L, 50 mg/L, and 100 mg/L of VS, respectively. As a result of these processes, it was noted that the use of Caa and VS increases the solubility of Fe at a higher pH.

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All data collected and materials used in this study were described in the manuscript.

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Acknowledgements

The Central Laboratory for Marine Aquaculture of the Marine Sciences Department of the Universidad Católica del Norte provided equipment support.

Funding

The authors wish to thank to the Chilean Ministry of Education and its FONDECYT-Postdoctoral project n° 3180297, Regular Fondecyt N° 1210841, for the financial support.

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This manuscript was contributed by all the authors. Rodrigo Poblete performed the experimental work, collected the data, prepared some figures, and wrote the initial draft. Ernesto Cortes, Norma Pérez, and Manuel I. Maldonado verified the availability of the data and information, provided figures, and wrote and reviewed the manuscript. All authors read and approved the final manuscript.

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Correspondence to Rodrigo Poblete.

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Poblete, R., Cortes, E., Pérez, N. et al. Use of vinasse and coffee waste as chelating agent of photo-Fenton landfill leachate treatment. Environ Sci Pollut Res 30, 5037–5046 (2023). https://doi.org/10.1007/s11356-022-22573-0

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  • DOI: https://doi.org/10.1007/s11356-022-22573-0

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