Effect of Different Operating Temperatures on the Biological Hydrogen Methanation in Trickle Bed Reactors

Abstract

To improve the reactor efficiency, this study investigated the influence of temperature on the biological hydrogen methanation (BHM) in trickle-bed reactors (TBR). Rising temperatures increase the metabolic activity of methanogenic microorganisms, thus leading to higher reactor specific methane formation rates (MFR). In order to quantify the potential for improved performance, experiments with four different operating temperatures ranging from 40 to 55 • C were carried out. Methane content increased from 88.29 ± 2.12 vol % at 40 • C to 94.99 ± 0.81 vol % at 55 • C with a stable biological process. Furthermore, a reactor specific methane formation rate (MFR) of up to 8.85 ± 0.45 m 3 m −3 d −1 was achieved. It could be shown that the microorganisms were able to adapt to higher temperatures within hours. The tests showed that TBR performance with regard to BHM can be significantly increased by increasing the operating temperature.

Comparative analysis of the effect of cell immobilization on the hydrogenothrophic biomethanation of CO2

“…Some parameters used to determine the performances of bioreactors in hydrogenotrophic biomethanation are reported as follows; MFR (methane formation rate) (Eqn ), hydrogen consumption (Eqn ), 45 GHSV (gas hourly space velocity) and gas retention time 34–36 . Besides these parameters, Eqn and Eqn were used in this study to determine the microbial inventory in different parts of the bioreactor and also suspended sludge.…”

“…As alternative strategy, gas recirculation was also reported to result in better H 2 conversion 26,29,30,33 . Götz et al ., 34 Ullrich et al ., 35 Lemmer and Ullrich, 36 calculated Methane Formation Rate (MFR,(m 3 /m 3 /day)) using only wet (reaction) volume instead of total reactor volume in their studies. In these studies, Lemmer and Ullrich 36 studied different temperatures with trickle bed reactor.…”

“…Götz et al ., 34 Ullrich et al ., 35 Lemmer and Ullrich, 36 calculated Methane Formation Rate (MFR,(m 3 /m 3 /day)) using only wet (reaction) volume instead of total reactor volume in their studies. In these studies, Lemmer and Ullrich 36 studied different temperatures with trickle bed reactor. When the temperature increased from 40 to 55°C, the methane content increased from 88% to 94% and the maximum MFR of 8.85 m 3 /m 3 /day was achieved.…”

Biological CO2-Methanation: An Approach to Standardization

“…Our study revealed that some authors use the term 'biological hydrogen methanation' (BHM) to define the biologically-driven conversion as opposite to the catalytic-chemical process [30,60]. However, this term implies that hydrogen is converted to methane but the conversion of one element into another, namely hydrogen (H) into carbon (C), is not possible from a chemical point of view.…”

Wireless Temperature Sensor Based on a Nematic Liquid Crystal Cell as Variable Capacitance

“…Temperature changes are crucial in biological processes [1], manufacturing techniques [2] or biomedical applications [3], among others. For this reason, commercial sensors should be able to work in diversified operation conditions, as well as different temperature ranges.…”