Wet Air Oxidation Route for the Synthesis of Organomineral Fertilizers from Synergistic Wastes (Pomace and Kimberlite)

Abstract

Wet air oxidation (WAO) of grape pomace, an organic waste generated in massive amounts worldwide and with low biodegradability due to phenol-acid content, was performed to evaluate the potential production of an organomineral fertilizer with biostimulant properties. The synergistic effect of co-processing kimberlite rock powder, a diamond mine tailing, was tested as a potential waste-derived catalyst due to its ferrous iron content and as a potential carbon sink due to its alkaline earth-silicate content. The gaseous, liquid, and solid phases were characterized by gas chromatography, wavelength-dispersive X-ray fluorescence, pH, loss on ignition, thermogravimetric analysis, attenuated total reflectance Fourier-transform infrared spectroscopy, calcimetry, and turbidity, and the results were also subjected to bivariate and multivariate analyses (Pearson correlation coefficient and principal component analysis) to uncover data patterns. The products obtained from WAO were evaluated in bioassays for their soil amendment properties: one assay as a nutrient source to alfalfa (Medicago sativa L) and another assay with soybean (Glycine max L. Merrill) under abiotic stress. The results revealed that temperature and kimberlite play an important role in the oxidation performance of steadfast humic-like substances, and kimberlite is a sink for part of the CO2 that is produced during WAO via mineral carbonation. The WAO products were found to possess beneficial nutrients and properties as soil amendments in terms of sustaining early plant development and alleviating salinity stress.

Comparative bibliometric trends of microplastics and perfluoroalkyl and polyfluoroalkyl substances: how these hot environmental remediation research topics developed over time

“…Principal Component Analysis (PCA), a multivariate statistical method, was used as a data descriptive tool to uncover patterns and determine which factor has the greatest impact on the publication ratio, as well as to reduce the dimensionality of the downloaded dataset (steps 1–3); this technique can reduce the dimensionality of the original variables by computing the principal components, which are a new set of variables that represents a linear combination of the original variables. 33,34 This method was adapted from Fantucci et al 35 and helps to gain a better understanding of the most important factors affecting the number of publications in different countries by using PCA analysis. As a descriptive tool, PCA does not require any distributional assumptions; however, a normal distribution should be assumed for inferential purposes.…”

Multiscale Process Intensification of Waste Valorization Reactions

“…To this end, we have relied on developing and adapting process intensification strategies and principles of circular economy and industrial symbiosis. Waste streams used in the last six years have included mining tailings, metallurgical slags, desalination brine, pulp and paper liquor, and food processing residues, and final products have 3 Reproduced with permission from ref 3. Copyright 2021 American Chemical Society.…”

“…Putting PI principles into practice, in Fantucci et al 3 we utilized wet air oxidation (WAO) to convert grape pomace, a widespread and poorly biodegradable organic waste, to a potential organomineral fertilizer (Figure 3i). The catalytic and carbon sink roles of kimberlite rock powder, an underutilized byproduct of diamond mining, were also examined.…”

“…Chem. Res.2021601165711675 . Mining and food processing wastes were combined via a catalytically assisted oxidation process to generate agriculturally valuable coproducts. HaqueF.SantosR.…”

“… (i) Wet air oxidation route for the synthesis of organomineral fertilizers from synergistic wastes (pomace and kimberlite) . Reproduced with permission from ref . Copyright 2021 American Chemical Society.…”