ДОСЛІДЖЕННЯ ВПЛИВУ БІОВУГІЛЛЯ З ВІДПРАЦЬОВАНОЇ КАВОВОЇ ГУЩІ НА АНАЕРОБНЕ ЗБРОДЖУВАННЯ ХАРЧОВИХ ВІДХОДІВ РЕСТОРАННОГО ГОСПОДАРСТВА

Taisiia Sokolova; Galyna  Krusir; Christoph  Hugi; Lena  Breitenmoser; Elmira  Yeleuova; Gulnur  Daldabayeva; Myroslav  Malovanyy; Oleksii Korkach; Valeriia  Sokolova

doi:10.15421/jchemtech.v32i2.297925

Authors

Taisiia Sokolova Odesa National Technological University, Ukraine https://orcid.org/0000-0002-5717-4779
Galyna Krusir Odesa National University of Technology, Institute for Ecopreneurship, School of Life Sciences, University of Applied Sciences und Arts Northwestern Switzerland, Ukraine https://orcid.org/0000-0002-2451-2364
Christoph Hugi Institute for Ecopreneurship, School of Life Sciences, University of Applied Sciences und Arts Northwestern Switzerland, Switzerland https://orcid.org/0000-0002-3035-9327
Lena Breitenmoser Institute for Ecopreneurship, School of Life Sciences, University of Applied Sciences und Arts Northwestern Switzerland, Switzerland https://orcid.org/0000-0002-7024-6124
Elmira Yeleuova Korkyt Ata Kyzylorda University, Kazakhstan
Gulnur Daldabayeva Korkyt Ata Kyzylorda University, Kazakhstan
Myroslav Malovanyy Lviv Polytechnic National University, Ukraine https://orcid.org/0000-0001-7781-4238
Oleksii Korkach Odesa National Technological University, Ukraine
Valeriia Sokolova Odesa National Technological University, Ukraine

DOI:

https://doi.org/10.15421/jchemtech.v32i2.297925

Keywords:

environmental biotechnology; anaerobic digestion; biogas; biochar; food waste.

Abstract

The uncontrolled and unsanitary disposal of food waste, which is a valuable raw material for Ukraine's energy independence, has led to a negative impact on the environment, public health and socio- economic development. Integration of food waste into an advanced closed-loop economy will allow for a significant increase in sustainable bioenergy production. The aim of the study was to evaluate the impact of biochar obtained from waste coffee sludge on the anaerobic digestion of food waste from the restaurant industry, which was done using biogas accumulation and digestate quality indicators, such as pH, sCOD, VFAs, NH ⁴⁺-N concentration.

The results show that thermophilic anaerobic digestion with a higher degree of hydrolysis was prone to instability due to the accumulation of VFAs and a drop in pH. Biochar from spent coffee sludge effectively stimulates the consumption of VFAs and increases methane production, especially under thermophilic conditions. The biochar treatment achieved both higher maximum specific methane production rates and shorter retention times. As the amount of biochar increased from 0 to 15 g l^-1 , the cumulative methane production under thermophilic conditions increased from 296.7 ml g^-1 VSadded to 476.1 ml g^-1 VSadded, while the fermentation time decreased from 22 days to 14 days. pH, temperature and VFAs were important factors indicating that increasing the anaerobic digestion process rate leads to better performance in thermophilic digestion using biochar. The potential use of biochar from food waste (waste coffee grounds) in the anaerobic digestion of food waste can simultaneously address the pollution problem of several types of organic waste, including kitchen waste and restaurant food waste. The biochar increased the methane yield and also ensured stable operation with a short lag time in the thermophilic anaerobic digestion process. The methane produced can be used for biomass pyrolysis.

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