Organic matter humification in olive oil mill wastewater by abiotic catalysis with manganese(IV) oxide

Bioresource Technology
Gennaro BrunettiCésar Plaza

Abstract

The chemical changes occurring in an olive oil mill wastewater (OMW) sample digested catalytically with MnO2 for 30 and 60 days were evaluated comparatively with those occurring in the same OMW left standing for the same time in an open-air lagoon. Both treatments increased the pH and electrical conductivity and decreased the contents of dry matter, total organic C and total N, and C/N ratio of OMW. The humic acid (HA)-like fraction isolated from the fresh OMW was characterized by a marked aliphatic character, small O and acidic functional group contents, marked presence of proteinaceous materials, partially modified lignin moieties and polysaccharides-like structures, extended molecular heterogeneity, and small degrees of aromatic ring polycondensation, polymerization and humification. With increasing the time of either lagooning or catalytic digestion, a loss of aliphatic materials and an increase of extraction yield, oxygenation, acidic functional groups, carbohydrates and aromaticity occurred in the HA-like fractions. The more evident changes measured for the HA-like fractions from catalytically-digested OMW, with respect to those from lagooned OMW, indicated that MnO2 was able to catalyze organic matter humification in OMW.

Citations

Oct 16, 2016·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Xuefei TuMasami Fukushima
Sep 10, 2014·Journal of Colloid and Interface Science·Herve Goure-DoubiLéon koffi Konan
Jun 22, 2019·Environmental Science and Pollution Research International·Shuai WangDianyuan Chen

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