

Influnce of the recirculation ratio of the methanogenic digester effluent on the dynamics of biohydrogen formation in a two-stage process of anaerobic bioconversion of liquid organic waste
https://doi.org/10.15518/isjaee.2021.01.003
Abstract
This paper considers the production of biohydrogen in a two-stage process of anaerobic bioconversion of organic matter (OM) of liquid waste with recirculation of digester effluent into an anaerobic bioreactor for dark fermentation (ARDF). The values of the average biohydrogen specific yield (BSY) and the average volumetric biohydrogen production rate (VBPR) were obtained at 4 recirculation ratios (RR) of the digester effluent (1, 1.1, 1.18, 1.25) and 2 hydraulic retention times (HRT) ( 1 and 2.5) in ARDF. Organic loading rate (olr) varied from 7.96 to 21.6 g OM / (l ∙ day). The pH value in ARDF practically did not depend on RR and HRT, and ranged from 3.8 to 4.16. The maximum BSY was 0.108 l / (day ∙ g OMin) with a RR of 1.11 and a HRT of 2.5 days. The maximum VBPR was observed at RR 1 and HRT 1 day and amounted to 1.67 l / (l ∙ day). The methane content in biohydrogen-containing biogas at modes providing maximum BSY and VBPR was no more than 0.01%, but it increased sharply at higher values of RR and HRT. The hydrogen content in biogas averaged 50-52% for all combinations of RR and HRT, but it sharply decreased to 46.7% with HRT 2.5 and RR 1.25. In general, with RR 1.11 and HRT 1 day, an increase in BSY by 9.05% was observed, while the VBPR decreased by 1.04% (compared with RR 1.0 and HRT 1 day). In general, the experi- mental data obtained allow us to speak of a RR equal to 1.11 as the most effective for both HRTs in the studied range of RR.
About the Authors
A. A. KovalevRussian Federation
Andrey A. Kovalev, senior researcher of the laboratory of bioenergy and supercritical technologies, candidate of technical sciences
D. A. Kovalev
Russian Federation
Dmitry A. Kovalev, head of the laboratory of bioenergy and supercritical technologies, candidate of technical Sciences
Yu. V. Litti
Russian Federation
Yuriy V. Litti, Senior Researcher, Laboratory of Microbiology of Anthropogenic Habitats, Candidate of Biological Sciences
I. V. Katraeva
Russian Federation
Inna V. Katraeva, associate professor of the chair of water supply, sewage, engineering ecology and chemistry, candidate of technical sciences
A. N. Nozhevnikova
Russian Federation
Alla N. Nozhevnikova, Laboratory of Microbiology of Anthropogenic Habitats, Doctor of Biological Sciences
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Review
For citations:
Kovalev A.A., Kovalev D.A., Litti Yu.V., Katraeva I.V., Nozhevnikova A.N. Influnce of the recirculation ratio of the methanogenic digester effluent on the dynamics of biohydrogen formation in a two-stage process of anaerobic bioconversion of liquid organic waste. Alternative Energy and Ecology (ISJAEE). 2021;(1-3):34-46. (In Russ.) https://doi.org/10.15518/isjaee.2021.01.003