The Effect of Spent Bleaching Earth Ageing Process on Its Physicochemical and Microbial Composition and Its Potential Use As a Source of Fatty Acids and Triterpenes

Overview

Journal Environ Sci Pollut Res Int

Publisher Springer

Specialties Environmental Health
Toxicology

Date 2014 May 31

PMID 24875308

Authors

Teresa Krzysko-Lupicka

Krystyna Cybulska

Andrzej Wieczorek

Ewa Mozdzer

Maciej J Nowak

Affiliations

Soon will be listed here.

Abstract

This study was aimed at investigating the physicochemical and microbiological changes that took place during the ageing process of spent bleaching earth in the presence of autochthonous microorganisms. Research material included fresh spent bleaching earth (SBE0) and the same material after 3 years of storage at the constant temperature of 20 °C, without aeration and moistening (SBE3). Changes in the chemical composition of analysed waste material were observed during its ageing process point to a spontaneous bioconversion of fat substance towards formation and/or release of free saturated fatty acids C16:0 and C18:0 (14.3 g 100 g(-1) D.M.), triterpenes (8.48 g 100 g(-1) D.M.), cholesterol (3.29 g 100 g(-1) D.M.), small quantities of carbohydrates and esters (0.80 g 100 g(-1) D.M.). This process was accompanied by other changes in physicochemical parameters of the waste material, such as colour, odour and viscosity, decrease in fat content from 28.27 to 24.6 % and that of soluble forms of metals (Mo, Cu, Fe, Zn, Ni, Cr and Mn), ranging from 25 to 75 %, and an increase in pH, from 3.85 to 4.2. At the same time, changes in the microbial consortium were observed.

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