Biogas Potential of Coffee Processing Waste in Ethiopia

Chala, Bilhate; Oechsner, Hans; Latif, Sajid; Müller, Joachim

doi:10.3390/su10082678

Cited by 55 publications

(30 citation statements)

References 32 publications

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“…50%, with a moisture content of approximately 21%. Similar results were reported by Chala et al [2018], while Cruz and Crnkovic [2015] reported a ratio of 45% : 50%.…”

Section: The Smallholder Coffee Life Cyclesupporting

confidence: 86%

A Study of the Smallholder Coffee Agroindustry Sustainability Condition Using the Life Cycle Assessment Approach in Bengkulu Province, Indonesia

Hamdan¹,

Fauzi²,

Rusli³

et al. 2019

J. Ecol. Eng.

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The management of smallholder coffee plantations in Bengkulu Province has not yet conducted according to good agricultural practices. As a result, the productivity and quality of green beans produced are also low. The efforts to improve this condition need to be made in order to maintain the economic, social, and environmental sustainability of this agribusiness. The present study aimed at identifying the life cycle of the coffee agroindustry in supporting sustainable agriculture using the Life Cycle Assessment (LCA) method. The results of the study revealed that the energy input from the use of fertilizers, herbicides, manpower, and fossil fuel was 4349.08 MJ/ha. The energy output from the green beans and coffee husks was 9763.39 MJ/ha and 13524.21 MJ/ha, respectively, so the efficiency based on the input-output ratio was 5.35. The emission values to the global warming potential, acidification, and eutrophication were 109.43 kg eqCO 2 , 345.70 g SO 2 eq/ha/year, and 28.54 g PO 4 3eq/ha/year, respectively. The coffee agribusiness in Kepahiang Regency is categorized as organic. The coffee agribusiness was economically feasible with a Net B/C of 2.87, but the land ownership which was 1.45 ha/household and the present agribusiness conditions indicate a low sustainability rate.

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“…50%, with a moisture content of approximately 21%. Similar results were reported by Chala et al [2018], while Cruz and Crnkovic [2015] reported a ratio of 45% : 50%.…”

Section: The Smallholder Coffee Life Cyclesupporting

confidence: 86%

A Study of the Smallholder Coffee Agroindustry Sustainability Condition Using the Life Cycle Assessment Approach in Bengkulu Province, Indonesia

Hamdan¹,

Fauzi²,

Rusli³

et al. 2019

J. Ecol. Eng.

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“…This disposal of coffee husks not only wastes biomass energy and land resource, but also causes certain environmental harms such as affecting the soil and water quality (Preethu et al, 2007). According to Chala et al’s (2018) report, from 2007 to 2016, annual coffee production increased from 273,400 ton (t) to 469,091 t, while the planting area increased from 407,147 ha to 700,475 ha. Consequently, the coffee waste grew as the amount of processed coffee cherries increased.…”

Section: Introductionmentioning

confidence: 99%

Study on the biogas potential of anaerobic digestion of coffee husks wastes in Ethiopia

Zhang

et al. 2020

Waste Manag Res

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The poorly controlled discharge of coffee husks in Ethiopia causes severe environmental pollution and is a waste of resources. The volatile solid and carbon content in coffee husks waste indicates that it is rich in organic matter and has huge potential to produce biogas. This study investigated the feasibility of coffee husks to produce biomass through anaerobic digestion, based on temperature, initial pH, inoculum/substrate (I/S) ratio and carbon/nitrogen (C/N) ratio. The study demonstrated that the maximum production of biogas and methane reached 3359.6 ml and 2127.30 ml, respectively, under the conditions of mesophilic temperature (35±1°C), an initial pH of 7, an I/S ratio of 0.75 and a C/N ratio of 30. Based on this result, the effects of trace elements (Fe2+, Ni2+, Co2+) on biogas production and methane content were also explored. Compared with the group with no addition of trace elements, the experiment adding trace elements had significant enhancement effects on the production of biogas and methane, in which Fe2+ played a leading role ( p<0.05). Fe2+ promoted the hydrolysis and acidification of coffee husks, resulting in the production of a series of intermediates such as volatile fatty acids and the other kinds of dissolved organic matter. Furthermore, the cooperation of Ni2+, Co2+ and Fe2+ enhanced the activity of the enzyme system in methanogens, promoting methane production. The results in this paper show that coffee husks have clear biogas potential through anaerobic digestion, and its effective utilization could fulfill the dual purpose of solid waste reclamation and local environmental protection in Ethiopia.

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“…Sugars such as sucrose, glucose and fructose, and organic acids such as lactic acid, formic acid, acetic acid and propionic acid were determined as described by Haag, et al [35]. The chemical characteristics of husks, pulp and mucilage were already presented in detail in a previous study of the authors [36].…”

Section: Chemical Analysismentioning

confidence: 99%

Introducing Temperature as Variable Parameter into Kinetic Models for Anaerobic Fermentation of Coffee Husk, Pulp and Mucilage

2019

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Primary coffee processing generates important by-products-the pulp, husk and mucilage-while producing the green coffee beans. These by-products represent a large quantity of biomass and might create an adverse impact on environment if they are left to uncontrolled natural decay. In this study, the bio-methane formation potential of coffee husk, pulp and mucilage was examined in batch assays performed at 21 • C, 30 • C and 37 • C. The mean specific methane yield (SMY) from husk, pulp, and mucilage were 159.4, 244.7 and 294.5 L kg −1 volatile solids(VS), respectively, for a fermentation temperature of 37 • C; 156.8, 234.8 and 287.1 L kg −1 VS, respectively, for 30 • C; and 139.9, 196.2 and 255.9 L kg −1 VS, respectively, for 21 • C. Two kinetic models, namely, the modified Logistic model (LOG) and the modified Gompertz model (GOM), were applied to fit experimental data and the respective kinetic constants were generated. Both models exhibited a very good fit to the measured data points (R 2 > 0.987). The relationship of kinetic constants of substrates with fermentation temperatures was established and inserted into the LOG and GOM models; thus, generalized LOG and GOM models were obtained to predict SMY of the substrates at any temperature between 21 • C and 37 • C.

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Biogas Potential of Coffee Processing Waste in Ethiopia

Cited by 55 publications

References 32 publications

A Study of the Smallholder Coffee Agroindustry Sustainability Condition Using the Life Cycle Assessment Approach in Bengkulu Province, Indonesia

A Study of the Smallholder Coffee Agroindustry Sustainability Condition Using the Life Cycle Assessment Approach in Bengkulu Province, Indonesia

Study on the biogas potential of anaerobic digestion of coffee husks wastes in Ethiopia

Introducing Temperature as Variable Parameter into Kinetic Models for Anaerobic Fermentation of Coffee Husk, Pulp and Mucilage

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