Efficiency of using an anaerobic bioreactor for wastewater treatment

Authors

DOI:

https://doi.org/10.31548/dopovidi4(104).2023.001

Keywords:

bioreactor design, biogas production, anaerobic conditions, moving biofilm carrier

Abstract

The object of study is the process of biogas production in a bioreactor with a stirring device and an inert biofilm carrier. The problematic issue is the retention of biofilm on inert media at a certain number of revolutions of the stirrer. A scheme of a laboratory setup for studying the process of biogas production in a bioreactor with an inert carrier is presented. An important value was determined - the specific rate of substrate release  , without which it is impossible to calculate the biofilm surface and determine the amount of methane released. The influence of hydraulic flow (Reynolds criterion) on methane formation was determined. The number of revolutions of the stirring device was selected to keep the biofilm on inert media and prevent its detachment. The process of mass transfer of the substrate from wastewater to the surface of the biofilm; conversion of the substrate by active acidogenic biomass into acetic acid; conversion of acetic acid by methanogenic biomass into biogas is considered. The advantage of the proposed study of the influence of hydrodynamics on the process of biogas production in anaerobic conditions from the process of fluidization, in that, due to the intensive circulation of the liquid, it is possible to detach the biofilm from the surface of the inert media, is emphasized. It is proposed to create an optimal bioreactor apparatus that would fully ensure such a technological process. In the optimal mode of operation of the bioreactor, the number of revolutions of the stirring device is n = 2 rpm. The final concentration of the substrate in the wastewater reaches the value S2 = 0.1 kg COD/ m3. The amount of methane produced is VCH4= 0.409 m3/day. It can be used in practice in the wastewater treatment of the following industries: dairies, meat processing plants, in the production of juices and wines in food production. These enterprises have a high content of organic matter in their wastewater. This leads to an increased amount of biogas produced.

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Published

2023-08-30

Issue

No. 4/104 (2023)

Section

Biology, biotechnology, ecology

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