Waste Products

Adams, M. R.; Dougan, J.

doi:10.1007/978-94-009-3417-7_9

Cited by 18 publications

(12 citation statements)

References 14 publications

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“…Similarly, Baier and Schleiss [20] determined a biogas potential of 380 L kg −1 VS (57-66% methane) and 900 L kg −1 VS of pulp using batch assay and semi-continuous digesters, respectively. Adams and Dougan [21] reported the suitability of anaerobic conversion of coffee pulp and the waste water for waste treatment, and the generation of useful fuel, as high as 66 m 3 per ton of pulp digested. Variation in the bio-methane potentials of substrates could be attributed to the variety of coffee waste investigated and mode of fermentation.…”

Section: Introductionmentioning

confidence: 99%

Biogas Potential of Coffee Processing Waste in Ethiopia

et al. 2018

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Primary coffee processing is performed following the dry method or wet method. The dry method generates husk as a by-product, while the wet method generates pulp, parchment, mucilage, and waste water. In this study, characterization, as well as the potential of husk, pulp, parchment, and mucilage for methane production were examined in biochemical methane potential assays performed at 37 • C. Pulp, husk, and mucilage had similar cellulose contents (32%). The lignin contents in pulp and husk were 15.5% and 17.5%, respectively. Mucilage had the lowest hemicellulose (0.8%) and lignin (5%) contents. The parchment showed substantially higher lignin (32%) and neutral detergent fiber (96%) contents. The mean specific methane yields from husk, pulp, parchment, and mucilage were 159.4 ± 1.8, 244.7 ± 6.4, 31.1 ± 2.0, and 294.5 ± 9.6 L kg −1 VS, respectively. The anaerobic performance of parchment was very low, and therefore was found not to be suitable for anaerobic fermentation. It was estimated that, in Ethiopia, anaerobic digestion of husk, pulp, and mucilage could generate as much as 68 × 10 6 m 3 methane per year, which could be converted to 238,000 MWh of electricity and 273,000 MWh of thermal energy in combined heat and power units. Coffee processing facilities can utilize both electricity and thermal energy for their own productive purposes.

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Section: Introductionmentioning

confidence: 99%

Biogas Potential of Coffee Processing Waste in Ethiopia

et al. 2018

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“…The heap was shuffled after one week in order to enhance the composting process by blending and breaking up the composting materials (Harold et al, 1994). The most efficient method of composting coffee husk and pulp has been described by Dougan (1980 and1981). Aerobic windrow composting method was used for composting.…”

Section: Preparation Of Composting Materialsmentioning

confidence: 99%

Evaluation of Composting Process and Quality of Compost from Coffee By-Products (Coffee Husk & Pulp)

Kassa¹,

Suliman²,

Workayew³

2012

Ethiop. J. Env Stud & Manag

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Coffee pulp and husk are the main by-products generated by the coffee processing station and are disposed into arable land and surface water. Due to the contribution of these by-products to environmental pollution, environmentally friendly disposal methods are necessary. Therefore, composting as environmental friendly option for utilization of coffee by-products is important. The objectives of the study were to assess the properties of coffee by-products compost and analyzing changes in physico-chemical properties during process of composting. To this end, (coffee husk + pulp) (control), (coffee husk + pulp + cow dung), (coffee husk + pulp + Millettia ferruginea), (coffee husk + pulp + cow dung + Millettia ferruginea), (coffee husk + pulp + effective microorganism) were used to prepare compost. The experiment was laid in RCBD (5x3). The physico-chemical parameters were determined for all the treatments at 25, 45 and 70 days of composting. The level of pH in coffee by-products compost amended with Millettia ferruginea were highly significant (P<0.0001) as compared to coffee by-products compost amended with cow dung and effective microorganism alone. The level of N and Exch. K in coffee by-products compost amended with cow dung and Millettia ferruginea were highly significant (P<0.0001) as compared to the control and coffee by-products compost amended with cow dung and effective microorganism alone. The level of total N, OM, and C/N ratio in 25 day of composting were highly significant (p<0.0001) as compared to 70 day of composting. The physico-chemical parameter in different time of composting indicates that, composting coffee by-products compost up to 70 day were important to acquire quality compost. Comparison of experimental results proved that coffee byproducts compost amended with Millettia ferruginea and cow dung was better than other treatments for quality compost preparation. It is better to amend the coffee by-products with organic material before composting to improve the quality of the compost.

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“…The methane yield of coffee husk and pulp in anaerobic digestion has been reported by several researchers [13][14][15][16], and the results indicate that these residues may have better performance compared to other agricultural residues [2,6,17,18]. The authors determined the methane yield of husk and pulp at 159 and 245 L kg −1 VS, respectively.…”

Section: Introductionmentioning

confidence: 95%

Increasing the loading rate of continuous stirred tank reactor for coffee husk and pulp: Effect of trace elements supplement

Chala

Oechsner

Fritz³

et al. 2018

Engineering in Life Sciences

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In this study, the anaerobic performance and stability of coffee husk and pulp with and without trace element (TE) supplement was investigated, using 20 L mesophilic continuous stirred tank reactors for 140 days of experiment (DOE). The TE was cocktail of trace metals composed of Fe, Ni, Zn, Co, Mn, Mo, Se W and B. The organic loading rate (OLR) was increased stepwise from 2.5 (HRT = 40 d) to 6.0 kg VS m−3 d− 1(HRT = 16.7 d). The highest methane productivity from pulp with and without TE was 1.272 and 0.965 m3 m−3 d−1 at an OLR of 6.0 and 5.0 kg VS m−3 d−1; while the husks performed 0.895 and 0.795 m3 m−3 d−1 respectively, both at an OLR of 6.0 kg VS m−3 d−1. The specific methane yield (SMY) of pulp (at OLR = 5 kg VS m−3 d−1) with and without TEs was 217.9 ± 4.7 and 193.1 ± 8.2 L kg−1 VS; while husk yielded 149.2 ± 6.0 and 132.5 ± 4.9 L kg−1 VS, respectively. The effect of TEs on SMY was statistically significant (p < 001) at higher OLRs (5.0 ‐ 6.0 kg VS m−3 d−1). The TEs improved the anaerobic stability through an optimum alkalinity ratio (VFA/TIC < 0.3) and suppressed the accumulation of volatile fatty acids. Mono digestion of husks and pulp are prone to lack Mo, Zn, Ni and Fe in long‐term anaerobic fermentation. Further studies on co‐digestion of husk/pulp with animal manure and dry fermentation helps to efficiently use this biomass resource.

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Waste Products

Cited by 18 publications

References 14 publications

Biogas Potential of Coffee Processing Waste in Ethiopia

Biogas Potential of Coffee Processing Waste in Ethiopia

Evaluation of Composting Process and Quality of Compost from Coffee By-Products (Coffee Husk & Pulp)

Increasing the loading rate of continuous stirred tank reactor for coffee husk and pulp: Effect of trace elements supplement

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