Anaerobic co-digestion of food waste and piggery wastewater: Focusing on the role of trace elements

Zhang, Lei; Lee, Yong-Woo; Jahng, Deokjin

doi:10.1016/j.biortech.2011.01.082

Cited by 446 publications

(183 citation statements)

References 33 publications

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“…Fe, which is required in a higher amount than other trace elements, was available 29% in husk and 65% in pulp compared to the minimum requirements. Shortage of trace elements often causes a decline in biogas production due to the loss of a stable digestion process and eventually leads to a lower substrate feeding rate [36][37][38][39]. Full scale anaerobic digestion of coffee by-products thus requires supplementation of trace elements through co-digestion with animal manure or commercial formulas.…”

Section: Elemental Analysismentioning

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: Elemental Analysismentioning

confidence: 99%

Biogas Potential of Coffee Processing Waste in Ethiopia

et al. 2018

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“…Manure possesses a high alkalinity, while the Zhang et al (2011). Palmitic, linoleic and oleic are the most abundant long chain fatty acids (LCFA) in the OW samples ( Table 2).…”

Section: Waste Compositionmentioning

confidence: 99%

Two-phase anaerobic co-digestion of used vegetable oils’ wastes and pig manure

Hidalgo

Gómez

Martín-Marroquín

et al. 2014

Int. J. Environ. Sci. Technol.

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The purpose of this work was to study the anaerobic co-digestion of all the by-products generated during the processing of used vegetable oils (UVO) with the objective of proposing a solution for the treatment of these wastes. More specifically, this study investigates the advantages of two-phase anaerobic digestion for treating a mixture (1/5 v/v) of UVO processing wastes (OW) and pig manure (PM) using two semi-continuous digesters operated at mesophilic temperature (37 ± 1°C). The experiments were conducted at hydraulic retention time (HRT) of 0.5, 1, 2 and 4 days in the first stage (acidifier) and at HRT of 11.5, 15, 18 and 20 days in the second stage (methaniser). The results revealed that the HRT had a high influence on the soluble chemical oxygen demand (sCOD) and total dissolved solids (TDS) removal. The maximum total sCOD removal efficiency of 86.4 % and TDS removal efficiency of 81.9 % was achieved at 20 days of global HRT. The maximum biogas production of 0.65 m 3 per kilogramme of volatile dissolved solids (VDS) was removed, corresponding to a methane production of 0.42 m 3 CH 4 kg -1 . VDS removed (65 % CH 4 ) was also achieved at 20 days of HRT. The two-phase digestion system showed good stability, which was mainly attributed to the strong buffering capacity with the two-phase system and the high alkalinity from PM when co-digested with OW. The results obtained from this study provide fundamental information for scaling up a high-performance two-phase anaerobic system in the future.

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“…Furthermore, there are some research about the influence of trace elements on the recycling of food waste; for example, Zhang et al (2011b) suggested that food waste was deficient with some trace elements required for anaerobic digestion; however, the separation studies of trace elements from food wastes are rare. Additionally, Bernstad et al (2013) found that ground food waste collected from tank-connected systems had a low content of trace elements.…”

Section: Introductionmentioning

confidence: 99%

A study of the impact of moist-heat and dry-heat treatment processes on hazardous trace elements migration in food waste

Chen

Jin

Qiu

et al. 2014

Journal of the Air & Waste Management Association

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Using laboratory experiments, the authors investigated the impact of dry-heat and moist-heat treatment processes on hazardous trace elements (As, Hg, Cd, Cr, and Pb) in food waste and explored their distribution patterns for three waste components: oil, aqueous, and solid components. The results indicated that an insignificant reduction of hazardous trace elements in heat-treated waste-0.61-14.29% after moist-heat treatment and 4.53-12.25% after dry-heat treatment-and a significant reduction in hazardous trace elements (except for Hg without external addition) after centrifugal dehydration (P < 0.5). Moreover, after heat treatment, over 90% of the hazardous trace elements in the waste were detected in the aqueous and solid components, whereas only a trace amount of hazardous trace elements was detected in the oil component (<0.01%). In addition, results indicated that heat treatment process did not significantly reduce the concentration of hazardous trace elements in food waste, but the separation process for solid and aqueous components, such as centrifugal dehydration, could reduce the risk considerably. Finally, combined with the separation technology for solid and liquid components, dry-heat treatment is superior to moist-heat treatment on the removal of external water-soluble ionic hazardous trace elements.Implications: An insignificant reduction of hazardous trace elements in heat-treated waste showed that heat treatment does not reduce trace elements contamination in food waste considerably, whereas the separation process for solid and aqueous components, such as centrifugal dehydration, could reduce the risk significantly. Moreover, combined with the separation technology for solid and liquid components, dry-heat treatment is superior to moist-heat treatment for the removal of external water-soluble ionic hazardous trace elements, by exploring distribution patterns of trace elements in three waste components: oil, aqueous, and solid components.

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Anaerobic co-digestion of food waste and piggery wastewater: Focusing on the role of trace elements

Cited by 446 publications

References 33 publications

Biogas Potential of Coffee Processing Waste in Ethiopia

Biogas Potential of Coffee Processing Waste in Ethiopia

Two-phase anaerobic co-digestion of used vegetable oils’ wastes and pig manure

A study of the impact of moist-heat and dry-heat treatment processes on hazardous trace elements migration in food waste

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