Biohydrogen Production in the Two-Stage Process of Anaerobic Bioconversion of Organic Substance of Liquid Organic Waste with Recycle of Digister Effluent

At present, hydrogen energy is gaining immense popularity in the world due to the problem of depletion of nonrenewable energy sources, hydrocarbons, and environmental pollution caused by their growing consumption. Compared with electro- or thermochemical processes, the biological production of hydrogen has a number of advantages associated with greater environmental friendliness and low cost. Of particular interest is the dark process of producing hydrogen-containing biogas in the processing of organic waste under anaerobic conditions which allows you to take advantage of both energy production and solving the problem of recycling organic waste. This paper considers the production of biohydrogen in a two-stage process of anaerobic bioconversion of organic matter of liquid organic waste. Moreover, experimental studies were carried out continuously in reactors with increased volume. The article describes an experimental setup for investigating a two-stage process of anaerobic bioconversion of organic matter of liquid organic waste and setting up an experiment to study the effect of recycling the effluent of methantenk into an anaerobic bioreactor for the production of biohydrogen. The obtained experimental data on the specific yield of biohydrogen are consistent with the data obtained by other authors. The average specific yield of biohydrogen (per kilogram of initial organic matter) during recycling of the methantenk effluent increased by 4 % (from 0.1046 to 0.1087 m3 / (day * kg of OMin)). In addition, recycling of the methantenk effluent to the biohydrogen production reactor during two-stage anaerobic bioconversion allows us to reduce fluctuations in the output of biohydrogen from the reactor. At the same time, there is no methanogenic activity in the anaerobic bioreactor for the production of biohydrogen. The self-stabilizing pH level in the anaerobic bioreactor for producing biohydrogen is less than 4.5 (3.94 without effluent recirculation and 3.88 with recirculation), however, there is no inhibition of hydrogen formation. Thus, the use of recirculation of the methantenk effluent into the anaerobic bioreactor for producing biohydrogen can enhance the efficiency of the two-stage anaerobic bioconversion of organic waste while maintaining the stability of the process.

two-stage anaerobic process, dark fermentation, biohydrogen, recirculation of methantenk effluent, organic waste, biogas, methanogenesis

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