Comparative study of commercial gas with biogas produced from co-digestion of corn cob, rice chaff, goat and dog dungs

Abstract

Investigations were conducted to compare gas produced from co-digestion of corncob, rice chaff, goat dung and dog dung with commercial gas. The study was carried out anaerobically at a temperature of 29.5 to 33°C (mesophilic condition) in a mini laboratory digester (bioreactor) fabricated using guage 16 metal sheets with 80-L capacity for a 90-day retention time. The shredded corn cob and rice chaff were mixed with water at ratio 4:1 (waste to water) and 3:1 (waste to water) respectively and mixed with goat and dog dungs at ratio 2:1 (waste to water). The control sample collected from a domestic cooking gas cylinder contained 56.12% CH 2 , 0.14% NH 3 , 0.22% CO, 0.23% H 2 S and 43.20% CO 2 . The result obtained for the biogas analysis shows that Sample E (75:25) contains 63.54% CH 4 , 0.93% NH 3 , 0.84% CO, 0.54% H 2 S, 34.12% CO 2 . The value recorded for sample E represented the highest value obtained among the samples. Also the gas composition shows a good substitute for commercial gas.

Investigation of physicochemical characteristics of selected lignocellulose biomass

“…According to Omoniyi and Olorunnisola 4 , biomass is defined as organic materials mostly considered to be wastes since they do not directly go into foods or consumer products. Biomass includes kitchen residues, sewage sludge, farm residues, disposed environmental refuses, livestock droppings, organic fraction of municipal solid residue, vegetable market waste, agricultural and food wastes, animal manure, cow dung, mango pulp, green leaves, rice husks, pawpaw peels, and potatoes peels 5 – 8 . Biomass is composed of high volatile matter, which can be converted to other useful gaseous and liquid biofuels through thermochemical processes such as pyrolysis, bio-gasification, and combustion 9 .…”

Optimization of biogas yield from anaerobic co-digestion of corn-chaff and cow dung digestate: RSM and python approach

“…However, it is not economically viable since the biogas yield from the process is low (Jingura and Matengaifa, 2009). The cow dung digestate discharged from a J o u r n a l P r e -p r o o f digester contains about 1-12% solids and consists of refractory organics, new cells formed during digestion, and ash (Mukhuba et al, 2018;Okolie et al, 2018). The slurry can be used in its liquid or solid fractions, dried, or as total slurry.…”

Biogas Yielding Potential of Maize Chaff Inoculated with Cow Rumen and Its Characterization

“…Thus, cow rumen can be used in combination with other biodegradable wastes to yield higher methane production [23,22]. Maize (Zea mays), is one of the world's most consumed cereal grains [24]. It's the seed of a plant in the grass family, native to Central America but grown in countless varieties worldwide.…”

“…Previous findings have established the possibility of generating biogas and fermented organic liquid fertilizer (digestate) from cow dung and other animal excretory products in an anaerobic digester (AD) [25,26,27]. However, the costs of cow dung digesters are not favorable due to their relatively low biogas yield in comparison with several other types of organic wastes [24,10]. Also, in other reports, cow rumen has been used to co-digest corn straw but it yielded 60% methane which can be improved on by trying other maize waste like the chaff [28].…”