Optimization of anaerobic fermentation of kitchen waste

Dlabaja, T.; Malaťák, Jan

doi:10.17221/2/2012-rae

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…In the investigated period, the highest VS destruction (59%) was observed in the digesters of Taurage WWTP when the actual VS loading was 2.6 kg VS/m 3 /day. Such VS destruction level (∼60%) is in compliance the values specified in the scientific literature (Dlabaja & Malatak ; Tchobanoglous et al . ; Dauknys et al .…”

Section: Resultssupporting

confidence: 89%

Research of parameters affecting sludge digestion process

Dauknys

Mažeikienė

2017

Water & Environment J

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The parameters characterizing and affecting anaerobic sludge digestion process in three Lithuanian cities are investigated. Results showed that digestion process was effective in all three objects: specific biogas production varied between 0.77 and 0.86 m3/kg volatile solids destroyed, methane content in the biogas varied between 64 and 67% and they complied with the values presented in the scientific references. The increase of VS loading (up to 2.6 kg VS/m3/day) led to the higher level of VS destruction which was up to 59%. The sludge retention time (hydraulic retention time) values must be in ranges of 20–25 days for the digestion process in order to get the design VS destruction, as well the biogas production. In a case of lack of raw materials, the application of wastes from food industry can help to reach the design parameters. The application of wastes from milk industry showed positive results in the digestion process.

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Section: Resultssupporting

confidence: 89%

Research of parameters affecting sludge digestion process

Dauknys

Mažeikienė

2017

Water & Environment J

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“…But the normal range of volatile solid loading is in the range of 1 -4 kg vs /m 3 /day and the optimal loading rate for animal and kitchen waste is about 2.0 kg vs /m 3 /day (Eze, 2000;Dlabaja and Malaťák, 2013). Then with the volatile solid loading of 2.0 kg vs /m 3 /day and volatile solid added of 5.4 kg/day; Volatile solid loading rate is a measure of the biological conversion of the anaerobic digestion system.…”

Section: Design and Construction Of The Plastic Biogas Digestermentioning

confidence: 99%

Design and fabrication of 3.60 m3 household plastic bio digester loaded with kitchen waste and cow dung for biogas generation

Nwankwo¹,

Eze²,

Okoyeuzu³

2017

Sci. Res. Essays

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A 3.6 m 3 pilot plastic digester for family generation of biogas was designed, constructed and evaluated through physico-chemical studies using 50% cow dung and 50% kitchen wastes. The ash content of waste increased after digestion while the fibre and fat contents of the waste was 5.10 and 1.05% but significantly (p<0.05) decreased to 2.49 and 0.70% after digestion. The carbohydrate content of the waste was 11.02% which significantly (p<0.05) decreased to 7.91%. The volatile solid content of 50% cow dung + 50% cassava peel + yam peels + vegetable was 11.10%. The biochemical oxygen demand was 44.58% while the chemical oxygen demand was 139.20% before digestion but decreased significantly (p<0.05) after digestion. The pH of 50% cow dung + 50% cassava + yam peels + vegetable waste during digestion increased from 6.71 at day of charging to 6.81 at the 8th day after which it began to fluctuate between 6.68 and 6.85 throughout the retention period. Afternoon temperatures of both ambient and slurry were within the mesophilic (30 and 40°C) temperature which was higher than the morning and evening temperatures. The production of biogas started at the 2nd day by producing 406 L and increased each day till day 8, by producing 738 L and after which its production began to fluctuate between 572 and 718 L/day. Early biogas flammability was observed on the 4th day for 50% cow dung + 50% cassava + yam peels + vegetable. At the point of flaming, the methane content of the biogas increased significantly (p<0.05) to 65.65%, while the carbon dioxide decreased significantly (p<0.05) to 25.15%, for 50% cow dung + 50% cassava + yam peels + vegetable. The average biogas (0.601 to 0.505 m 3 /day) produced from the waste using 3.6 m 3 capacity plastic bio-digester could be sufficient to cook three times a day for household of 3 to 4 persons.

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“…In line with Li et al [13], the continuous anaerobic digestion experiment involved the stepwise loading of the reactors of the digester with prepared substrates of four different organic loading rates (OLRs) of 1, 2.5, 3.5, and 4.5 gVS/L/d and was operated for over 120 days. Organic loading rate, also known as volume load means the amount of organic dry solids loaded per liter volume of digester reactor per unit time, which can be delivered without overfeeding the bacteria, which could lead to process stress [5]. The continuous anaerobic digestion experiment got to steady state within 20, 9, 6, 3 days for OLRs 1, 2.5, 3.5, and 4.5 gVS/L/d, respectively.…”

Section: The Continuous Anaerobic Digestion Experimentsmentioning

confidence: 99%

The effect of organic loading rates (OLRs) on the performances of food wastes and maize husks anaerobic co-digestion in continuous mode

Owamah

Izinyon

2015

Sustainable Energy Technologies and Assessments

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a b s t r a c tA continuous anaerobic digestion experiment was carried out to investigate the co-digestion of 75% food waste and 25% maize husk at different organic loading rates (OLRs) of 1-4.5 gVS/L/d. Results obtained showed that pH fluctuated between 7.3 and 7.5 and total alkalinity (TA) between 0.4 and 6.7 g CaCO3/L, indicating that the system was not inhibited by acidification. The range of the ratio of volatile fatty acid (VFA) to TA of 0.06-0.25 was also well below 0.4 and showed that the anaerobic co-digestion was stable and feasible. Though there was no significant difference (p < 0.05) between biogas yields at OLRs of 3.5 and 4.5 gVS/L/d, the methane content at OLR of 4.5 gVS/L/d was higher than that of 3.5 gVS/L/d and suggests that carbon dioxide producing microorganisms were more active in OLR of 3.5 gVS/L/d. The OLR of 4.5 gVS/L/d was therefore found to be the most satisfactory for large scale operation of anaerobic digesters for co-digestion of food waste and maize husk. From a separate batch test, the average biogas yield of 0.50 ± 0.04, 0.24 ± 0.02 and 1.31 ± 0.07 L/gVS were obtained from digesters A, B and C, respectively, indicating that the addition of maize husk to digester C significantly improved the production of biogas from food waste when compared to the biogas yield of digester A that contained food waste alone. Digester B with 100% maize husk was by far the least performed digester.

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Optimization of anaerobic fermentation of kitchen waste

Cited by 9 publications

References 14 publications

Research of parameters affecting sludge digestion process

Research of parameters affecting sludge digestion process

Design and fabrication of 3.60 m3 household plastic bio digester loaded with kitchen waste and cow dung for biogas generation

The effect of organic loading rates (OLRs) on the performances of food wastes and maize husks anaerobic co-digestion in continuous mode

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