Portable Biogas Digesters for Domestic Use in Jordanian Villages

Abstract

Essential energy needs are not always met in poor and rural areas of developing counties; therefore, natural energy sources are necessary to mitigate this problem. Rural areas inhabitants utilize methane as a replacement for cooking gas to reduce their gas bill. Methane gas can be produced from a biogas digester; however, operating a large digester in a densely populated village in Jordan can be challenging due to inefficient village waste management systems. On the other hand, using a small-scale portable biogas digester to generate biogas could overcome these problems. In this work, three biogas digester feedstocks for a small portable biogas digester from natural sources available in Jordanian villages such as human and animal waste were designed and evaluated. The three feedstocks are food waste, human waste, and a mixture of human and food waste. The parameters tested were the digester size and the biogas production. The results showed that the best digester for portable application was that which digested a mixture of human and food waste; for a five-member family, this type of digester provided 115% of the family’s cooking gas requirements with a digester volume of 0.54 m3. This design, while applicable for a typical rural Jordanian family, can also be utilized globally.

Applying PICRUSt and 16S rRNA functional characterisation to predicting co-digestion strategies of various animal manures for biogas production

“… Genus Relative abundance in animal manure Predicted metabolic contribution References Bacteria genera in consortia likely playing roles in pathways related to growth and the synthesis and degradation of growth metabolites in manure Escherichia Horse < cow < pig Facultatively anaerobic with wide spectrum capability for several organic carbon sources necessary for heterotrophic growth, also known to be involved in acidogenesis. Mostly harmless but some species and strains are pathogenic 57 , 58 Glutamicibacter Horse < cow < pig Members of the genus are involved in lignocellulosic material saccharification, amino acid metabolism 59 , 60 Psychrobacter Pig < Horse < cow Psychrobacter spp. are capable of producing cold-active enzymes with involvement in the physiological strategies that off-set low temperature effects on cellular ATP and ADP generation, a key requirement in metabolic and energy conservation reactions The KEGG pathway shows involvement in riboflavin and tryptophan metabolism (see P. cryohalolentis and P. articus ) 61 Aerococcus Horse < cow < pig Members of the genus produce acids from a variety of carbohydrates and are directly involved in acidogenesis The KEGG pathway shows involvement of A. urinae in anaerobic energy and selenocompound metabolism.…”

Biorefineries at poultry farms: a perspective for sustainable development

“…Digestate can be used as a biofertiliser for arable land, enabling recirculation of plant nutrients, and thus reducing the need for fossil fueldependent inorganic fertilisers. 105 Despite its high potential, in some countries like those of the European Union, digestate is still categorised as animal manure in fertiliser legislation. 54 Inadequate digestate use could represent a problem in crops especially in high-nutrient regions.…”

Biofertilizer potential of digestates from small-scale biogas plants in the Cuban context

“…Anaerobic digestion (AD) has proven to be an economically feasible technology for the cyclic use of large-scale and small-scales organic waste (Huang et al, 2016;Alkhalidi et al, 2019). It is a widely used to convert organic material into energy-rich biogas and the residual sludge known digestate (Alburquerque et al, 2012).…”

“…It is a widely used to convert organic material into energy-rich biogas and the residual sludge known digestate (Alburquerque et al, 2012). Digestate can be used as a biofertilizer for arable land, enabling recirculation of plant nutrients, and thus reducing the need for fossil fuel-dependent inorganic fertilizers (Alkhalidi et al, 2019). The rapid development of biogas plants in European countries has increased the recycling of waste for energy generation, while producing large quantities of digestate (Franchino et al, 2016).…”