Limiting factors for biogas production from cow manure: energo-environmental approach

Abstract

The main innovation of the study is the use of a novel energo-environmental approach for investigation of biogas production, and analysis of the amount of methane and biogas produced in terms of energy production and global warming potential (GWP). Two types of reactors (laboratory-scale and semi-industrial reactors) were prepared for biogas production to perform a detailed study and for exact consideration of treatments in terms of production. Based on the results, the maximum methane production in the laboratory-scale set-up was related to a carbon/nitrogen (C/N) ratio of 30 at mesophilic temperature (35,967 ml/kg volatile solids). Accordingly, the C/N ratio in the semiindustrial reactor was considered to be 30; methane production was equal to 14/489m3 at loading rates of 237.5, 2.580 and 234.92 kg for cow manure, wheat straw and water content, respectively. The maximum biogas production occurred on day 65, from the viewpoint of energetic analysis. The highest daily net electricity production occurred on day 12, with a positive energy balance. However, considering GWP effects in the production and use of biogas, it would be better to stop production on day 48, in which case methane production would be equal to 77% of the final limit of biogas production. ARTICLE HISTORY

Thermophilic Biogas Upgrading via ex Situ Addition of H2 and CO2 Using Codigested Feedstocks of Cow Manure and the Organic Fraction of Solid Municipal Waste

“… 24 − 28 Other benefits of biological methanation include a wide spectrum of feedstocks (including waste materials) and microorganisms that are found in diverse anoxic environments. 16 , 29 The microorganisms that mediate CH 4 -forming biochemical reactions are known as methanogens. 30 , 31 These archaeal species also form a syntrophic relationship with other organisms such as acidogenic and acetogenic bacteria.…”

Production of Biogas from Bagasse: Effect of Cow Dung to Bagasse Feed Ratio, Media Solution pH and Digester’s Moisture Content on Biogas Volume and Methane Yield

“…Table 7 indicates that a digester operated at moisture content of 80.00%, media solution pH of 8.00, 4.64 g of cow dung and 5.36 g of bagasse are process conditions required to achieve optimum biogas volume of 305.87 ml and methane yield and 28.75 ml/gVS. Interestingly, our findings show better yield when compared to the work in [23]…”

Anaerobic Co-digestion of Pineapple Wastes with Cow Dung: Effect of Different Total Solid Content on Bio-methane Yield

“…This is due to the other biogas composition such as carbon dioxide and hydrogen that contribute more in terms of its composition (Khairul et al, 2018;Neshat et al, 2017). Biogas that contains high methane makes it a useful fuel to replace natural gas or can be transformed into heat and electricity (Jafari-Sejahrood et al, 2019).…”