Influence of co-substrates ratios on biogas yield during distillery spent washutilization

Keywords: distillery spent wash, poultry manure, biogas, cosubstrate, cofermentation

Abstract

Nowadays distillation industry is facing the problem of its own wastes disposal and recycling that are produced in large quantities. The main waste of alcohol industry is distillery spent
wash. Existing physical methods of distillery spent wash recycling are resource- and energy-consuming. Alternatively, biological methods such as aerobic and anaerobic digestion may be
applied. The advantage of anaerobic compared to the aerobic method is that besides wastewater it is possible to obtain biofuel (biogas) and high-quality fertilizer.
The main problems of anaerobic distillery spent wash recycling is imbalance and deficiency of nutrients, medium acidification due to low pH values of raw material.
pH and C:N ratio correction can be conducted by addition of chemical substances; provide the process with necessary microelements – an introduction of additional food source. The alternative
method is distillery spent wash co-fermentation. In this paper, the usage of poultry manure as fermentation co-substrate is proposed. Simultaneously with distillery spent wash, production
wastewater was also treated.
The purpose of this work is determination of substrate components ratio influence on biogas yield under anaerobic grain crops distillery spent wash co-fermentation.
Determined, that for optimal methanogenesis pH values the ratio of distillery spent wash to poultry manure must be in range f 1:1 to 1:3,3. Established that under insufficient manure contents in composition (ratios of distillery spent wash/manure 1:1) will take place the medium acidification due to organic acids accumulation from lipid destruction, that are contained in large amounts in distillery spent wash, and as such lipid content rises with distillery spent wash content increase.
The increase of manure content in relation to distillery spent wash (ratio 1:3) results in a methanogenesis process inhibition due increase in ammonia ions contents, that are contained in poultry manure and produced during urea hydrolysis and protein decomposition.
Determined, that for maximal biogas production it is rational to use distillery spent wash/poultry manure ratio 1:1,7 by dry weight. Under such conditions, biogas yield rises up to 265 cm3/g of dry organic weight with a methane content of 70 ± 2%.

Author Biographies

N. Golub, National Technical University of Ukraine "Igor Sykorsky Kyiv Polytechnic Institute"

golub.png

Information about the author: professor of Ecological Biotechnology and Bioenergetics Department of The National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Doctor of Technical Science, assistant professor, research fellow.

Education: graduated from the Taras Shevchenko National University of Kyiv.

M. Potapova, National Technical University of Ukraine "Igor Sykorsky Kyiv Polytechnic Institute"

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Information about the author: postgraduate student of Ecological Biotechnology and Bioenergetics Department of the National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute».

Education: graduated from the National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute».

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Published
2017-06-14
How to Cite
Golub, N., & Potapova, M. (2017). Influence of co-substrates ratios on biogas yield during distillery spent washutilization. Vidnovluvana Energetika, (2 (49), 90-97. Retrieved from https://ve.org.ua/index.php/journal/article/view/69