RT info:eu-repo/semantics/article
T1 Efficient recovery and characterization of humic acids from municipal and manure composts: A comparative study
A1 Fernández-Delgado, Marina
A1 López-Linares, Juan Carlos
A1 Lucas, Susana
A1 García-Cubero, Mª Teresa
A1 Coca, Mónica
K1 Humic acids
K1 Manure compost
K1 Municipal mixed waste compost
K1 Alkaline extraction
K1 contaminants of emerging concern
K1 UHPLC-MS-QTOF
AB The recovery of humic acids from low-quality compost obtained in municipal solid waste treatment plants provides opportunities for its valorization. This study compares the recovery and properties of the humic acids obtained from municipal mixed waste compost (MMWC) and manure compost. The effects of temperature, time, and KOH concentration on the ratio of humic acids in the extracted liquid and the content of organic carbon of the precipitates were investigated by response surface methodology. Optimal conditions were 30°C and 24 h for both composts, with a KOH concentration of 0.53 M for MMWC and 0.25 M for manure compost. The manure compost provided a liquid extract richer in humic acids than MMWC (76.6% vs. 33.7%), but the precipitates presented similar organic carbon contents (38.1% vs. 42.4%). Regarding composition, both humic acids presented higher organic carbon and nitrogen contents than the composts used as feedstock. The extraction and further precipitation of humic acids reduced the concentration of heavy metals. Humic acids from manure compost have a slightly higher average molecular weight (2650 Da) than those from MMWC (1980 Da), while both present similar C/N ratios and degree of aromaticity. Most contaminants of emerging concern present in the original composts were not detected in the humic acids. Thus, it was demonstrated that MMWC constitutes an attractive source of humic acids with properties similar to those obtained from a high-quality compost and, therefore, with potential economic value.
PB Elsevier
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/66595
UL https://uvadoc.uva.es/handle/10324/66595
LA eng
NO Waste Management 172 (2023) 245–255
NO Producción Científica
DS UVaDOC
RD 11-jul-2024