Obtaining biogas during fermentation of fat-containing wastes of leather production

Nataliia Golub,Alexandr Kozlovec,Malvina Shynkarchuk

doi:10.15587/1729-4061.2017.114216

Abstract

The possibility of biogas formation from wastes of fat-containing raw material, formed at different stages of the process of leather production was determined. The influence of impurities, which are used in the production process, on the yield of biogas and content of methane in it was shown. Fatty wastes that contain a significant amount of salts, SAS, and antiseptics, have twice as low rate of biogas formation. Existence of soda contributes to the process of methane genesis due to stabilization of pH value. The yield of methane and biogas from pure fat of pigs was lower than that while using wastes, containing impurities of salts. The rational parameters of fat-containing raw material for obtaining maximum yield of biogas and methane in it were determined. It was shown that the concentration of the substrate from wastes of treated skins pigs should not exceed 7.5 % or 13 g/dm 3 . Obtained laboratory results make it possible to develop the technology of anaerobic fermentation of fat-containing wastes of leather production, containing inorganic and organic impurities. The technology will enable us to solve environmental problems of waste disposal and to obtain the power carrier and a fertilizer.

Highlights

The production of leather has been increasing over recent years in Ukraine and throughout the world
A rise in the rate of production leads to the increased formation of amount of organic wastes
The generated organic wastes contain a large amount of inorganic salts and surface-active substances (SAS), which complicates recycling technology

Summary

Introduction

The production of leather has been increasing over recent years in Ukraine and throughout the world. A rise in the rate of production leads to the increased formation of amount of organic wastes (fats, scrapings, wool, and blood) This has negative environmental consequences, because there are no technologies for proper handling of such wastes in Ukraine. The main waste of this industry is the fat-containing raw material that includes chemical impurities, which are added in the process of manufacturing of the product (sodium chloride, calcium hydroxide, sodium sulfide, sodium carbonate, etc.). This limits the possibilities of using these wastes for the production of soap, detergents and materials for leather greasing [4]. That is why the study of the possibility of formation of biogas from wastes of leather industry is relevant

Literature review and problem statement

The aim and objectives of the study

Findings

Conclusions