Characterization of potential liquid organic fertilizers obtained by alkaline extraction from two‐phase olive‐mill waste composts

Baddi, Ghita Ait; Alburquerque, José Antonio; Tortosa, Germán; Winterton, Peter; Hafidi, Mohamed; Cegarra, J.

doi:10.1002/ep.11720

Cited by 7 publications

(2 citation statements)

References 32 publications

(60 reference statements)

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“…These results suggest that fulvic acid, which has a relatively simple structure in the composting process, is decomposed by mineralization and microbial action simultaneously and that part of the fulvic acid can also form humic acid with higher structural complexity through intermolecular bonding (Bu et al, 2015). The results described above are consistent with the report by (Baddi et al, 2013), which indicated that the composting process is characterized by an increase in the humification degree of DOM. Moreover, the ratio of FLR area to HLR area (A FLR /A HLR ) can be used to characterize DOM transformation during composting.…”

Section: Resultssupporting

confidence: 92%

Variation in the Humification Degree of Dissolved Organic Matter from Cattle Manure during Composting as Analyzed by Ultraviolet‐Visible and Fluorescence Spectroscopy

et al. 2017

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This study investigated the degree of humification of dissolved organic matter (DOM) during different periods of cattle manure composting using ultraviolet-visible (UV-vis) and fluorescence spectroscopy (emission, synchronous scan, and excitation-emission matrix) and determined which method is more suitable for analysis of the humification degree of DOM. Two composting piles were prepared by mixing manure and corn straw. One pile (Pile A [PA]) contained inoculated exogenous composite agents at a ratio of 2% (v/v), and a pile without the addition of inoculants (PNA) served as the control treatment. The results showed that ultraviolet integrated absorption intensities in the range of 226 to 400 nm and 260 to 280 nm and specific ultraviolet absorbances at 254 and 280 nm of both PA and PNA gradually increased with composting time. Based on the fluorescence regional integration analysis and parallel factor analysis, the humic-like substances became the main components of the DOM after composting. Our study demonstrated that the humification degree of DOM was enhanced during composting and that the inoculation composite agent was beneficial for the humification of DOM at the mesophilic and thermophilic phases of the composting process. Moreover, the results of correlation analysis and principal component analysis demonstrated that the fluorescence spectral parameters evaluated the humification degree of DOM during the whole cattle manure composting process better than the UV-vis spectral parameters.

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Section: Resultssupporting

confidence: 92%

Variation in the Humification Degree of Dissolved Organic Matter from Cattle Manure during Composting as Analyzed by Ultraviolet‐Visible and Fluorescence Spectroscopy

et al. 2017

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“…FA and HA were mainly composed of carbon and oxygen elements. The carbon and oxygen contents of FA were 28.99% and 65.37%, respectively, while those of HA were 50.98% and 38.88%, which were consistent with the elemental analysis ratio of HA reported in the previous literature [ 28 , 29 ].…”

Section: Resultssupporting

confidence: 91%

Co-Thermal Oxidation of Lignite and Rice Straw for Synthetization of Composite Humic Substances: Parametric Optimization via Response Surface Methodology

Chen

Zhuang

et al. 2022

IJERPH

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In this study, Baoqing lignite (BL) and rice straw (RS), which were the representatives of low-rank coal and biomass, were co-thermally oxidized to produce composite humic substances (HS), including humic acid (HA) and fulvic acid (FA). Taking HS content as the output response, the co-thermally oxidizing conditions were optimized through single factor experiment and response surface methodology (RSM). The structures of HA and FA prepared under optimized conditions were analyzed by SEM, UV, and FTIR. Results showed that HS content was clearly influenced by the material ratio, oxidation time, and oxidation temperature, as well as their interactions. The optimized co-thermal oxidization condition was as follows: BL and RS pretreated with a material ratio of 0.53, oxidation time of 59.50 min, and oxidation temperature of 75.63 °C. Through verification, the experimental value (62.37%) had a small relative error compared to the predicted value (62.27%), which indicated that the developed models were fit and accurate. The obtained HA had a tightly packed block structure; FA had a loosely spherical shape. The molecular weight of FA was 2487 Da and HA was 20904 Da; both had a smaller molecular weight than that reported in other literature. FA showed strong bands at 1720 cm−1, thus confirming the presence of more oxygen-containing functional groups. The appearance of double peaks at 2900~2980 cm−1 indicated that HA contains more aliphatic chains. The co-thermal oxidation of BL and RS gives a new method for the synthesis of HS, and the optimization of co-thermal oxidation conditions will provide fundamental information for the industrialization of composite HS.

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Effect of water and fertilization management on Cd immobilization and bioavailability in Cd-polluted paddy soil

Hou

AmanKhan

et al. 2021

Chemosphere

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Characterization of potential liquid organic fertilizers obtained by alkaline extraction from two‐phase olive‐mill waste composts

Cited by 7 publications

References 32 publications

Variation in the Humification Degree of Dissolved Organic Matter from Cattle Manure during Composting as Analyzed by Ultraviolet‐Visible and Fluorescence Spectroscopy

Variation in the Humification Degree of Dissolved Organic Matter from Cattle Manure during Composting as Analyzed by Ultraviolet‐Visible and Fluorescence Spectroscopy

Co-Thermal Oxidation of Lignite and Rice Straw for Synthetization of Composite Humic Substances: Parametric Optimization via Response Surface Methodology

Effect of water and fertilization management on Cd immobilization and bioavailability in Cd-polluted paddy soil

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