Microorganisms Associated with Biogas Production Using Vegetable (Telfairia occidentalis) Wastes, Banana Peel and Pig Dung as Substrates

Asikong, B. E.; Idire, S. O.; Tiku, D.R.

doi:10.9734/bmrj/2016/28294

Cited by 12 publications

(13 citation statements)

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“…The microbial loads and isolated microorganisms also decreased significantly (p<0.05) at the point of discharge. Similar result was reported by Asikong et al (2016). This may be due to deposition of microbial metabolites and gradual exhaustion of nutrient from the wastes (Ziemiński and Frąc, 2012;Li et al, 2015;Asikong et al, 2016).…”

Section: Microbial Isolates and Total Viable Count At Different Stagesupporting

confidence: 77%

“…This may be due to the condition in the bio-degradation system was thermo-dynamically unfavorable to the Nwankwo and Okoyeuzu 167 microorganisms initial presence immediately after charging (Ali Shah et al, 2014) while significant (p<0.05) increase immediately biogas production started mighty be due to high microbial populations involved in the hydrolytic and fermentative phases of biogas production. Comparable results were reported by Eze and Agbo (2010b) and Asikong et al (2016). At the peak of biogas production, the total viable count was significantly (p<0.05) higher than the initial stage of biogas production with WB 1 (5.81×10 8 cfu/ml) recording higher than others.…”

Section: Microbial Isolates and Total Viable Count At Different Stagesupporting

confidence: 58%

“…These microorganisms are classified into four groups such as hydrolytic, acidogenic (fermenting), acetogenic and methanogenic bacteria. They act on the different stages of the waste digestion to bring about effective biogas production (Asikong et al, 2016). During hydrolysis, bacteria transform the organic substrate into monomers and polymers, such as proteins, carbohydrates and fatty acids.…”

Section: Introductionmentioning

confidence: 99%

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Modification of plastic tank for bio-digestion of food wastes for biogas generation for cooking foods

Nwankwo¹,

Okoyeuzu²

2020

Int. J. Phys. Sci.

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The anaerobic states of the modified bio-digester and potentials of the generated biogas in cooking foods were evaluated. The study adopted experimental design. Data generated were analyzed using one-way analysis of variance and independent t-test. Carbon, free fatty acid, chemical and biochemical oxygen demand decreased significantly (p<0.05) while moisture and protein contents of the wastes increased significantly (p<0.05) after digestion. The 50% cow dung and 50% yam peel, and 50% cow dung and 50% vegetable had significantly (p<0.05) higher total (12.48%) and volatile (8.10%) solid contents respectively before digestion, but decreased significantly (p<0.05) after digestion. The pH of fermenting slurry was changing in line with the condition within the digester. Bacillus spp., Escherichia coli, klebsiella, Salmonella, Staphylococcus and Streptococcus were predominant microorganisms in all stages of biogas production from different wastes. Biogas generated from the wastes cooked significantly (p<0.05) faster than kerosene but not faster than liquefied petroleum gas. Cooking with biogas did not have any significant (p>0.05) effect on the proximate and sensory characteristics of foods when compared with the foods cooked with liquefied natural gas and kerosene.

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Section: Microbial Isolates and Total Viable Count At Different Stagesupporting

confidence: 77%

Section: Microbial Isolates and Total Viable Count At Different Stagesupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modification of plastic tank for bio-digestion of food wastes for biogas generation for cooking foods

Nwankwo¹,

Okoyeuzu²

2020

Int. J. Phys. Sci.

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“…The temperatures in both the modified and conventional digesters were relatively uniform and this relative uniformity had to do with the bigger size of the digester, which resists fluctuation due to changes in the surrounding temperature. The work of (Asikong et al, 2016) have supported this view.…”

Section: Discussionmentioning

confidence: 53%

Utilization of Rumen Content by Indigenous Microorganisms in a Modified Anaerobic Digester

Adam¹,

Yahaya²,

Musa³

et al. 2020

Energy Research Journal

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The current work was designed to assess the effect of modification of model digester on the kinetics that affects efficiency in biogas generation using bovine rumen content as the feedstock. A biogas plant consisting of conventional and modified fixed-dome digesters (each with 2 m 3 capacity) was established; and bovine rumen content was used as feedstock. Standard methods were used to determine the kinetic (physicochemical and microbiological) parameters. Identification of fungal and bacterial species involved in the process was carried out by genomic study of the 18S rRNA and 16S rRNA regions, respectively; amplified using universal forward and backward primers for fungi (NS1/NS4), bacteria ((515F/926R) and archaea (Met86F/Met140R); submitted to GenBank and analysed using Blast Programme at National Centre for Biotechnology Information website. A mass balance approach was used to estimate the theoretical gas yield from the total solid/volatile sold lost. It was found that the temperature in both modified and conventional digesters was uniform throughout the hydraulic retention time, between 32 to 34.5C, indicating a mesophilic range. The pH level was found to be lower in the modified digester compared to the conventional digester, indicating higher accumulation of organic acids. The mean total solid was found to drop from 12.49±0.53 to 3.82±0.21 in the modified digester after digestion, while this was from 13.30±0.4 to 6.69±0.16 in the conventional digester. The mean volatile solid drops from 66.67±1.62 to 36.13±0.27 in the modified digester after digestion, while it was from 69.94±1.54 to 54.23±1.33 in the conventional digester. The theoretical biogas yield was higher in the modified digester (87 mg/l) compared to the conventional one (65 mg/l). The microbial counts were observed to be affected by the kinetic parameters in both the digesters. The organisms identified were: Lactobacillus acidophilus, Bacteroides nordii, Clostridium perfringens, Clostridium acetobutylicum, Proteus vulgaris, Methanosarcina sicilia, Methanosarcina mazei, Methanobrevibacter ruminantium, Fusarium solani, Fusarium graminearum, Aspergillus niger and Penicillium specie. Conclusively, the modified digester, under a manual stirring at 10 round/min, 3 times a day at an interval of six hours, has appreciably generated higher theoretical biogas yield after 8 weeks hydraulic retention time. The agitation of the slurry using the improvised stirrer in the modified digester has significantly facilitated the utilization of the bovine rumen content by the indigenous microorganisms. Modification of digester to enhance mixing of the feedstock should therefore be encouraged in household anaerobic digesters.

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“…This may be because of a tougher lignin, cellulose and hemicelluloses in the dried sample as suggested by Adelekan and Bamgboye [18], who reported that lignin suppresses biodegradation and the higher the lignin content, the lower the biogas yield. The decline in the volume of biogas produced in weeks 4 and 5 when compared to week 3 when the volume of biogas peaked could be attributed to the decline in pH and increase in temperature of the medium, deposition of microbial metabolites (results not presented) as well as the gradual exhaustion of available nutrient from the substrates [19].…”

Section: Daily Biogas Productionmentioning

confidence: 99%

Study of the Microbial Composition and Comparative Biogas Production from Fresh, Dried and Cow-Dung Seeded Pumpkin (Cucurbita maxima) Residue

Charles¹

2020

EJCS

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The research study was aimed at identifying the microorganism(s) associated with biogas production as well as comparing the biogas production potential of the fresh, dried and cow dung seeded pumpkin wastes as substrate. The samples were procured from different fruit seller locations within Sokoto metropolis and the study conducted within a period of five weeks (35 days). Standard microbiological methods were used for isolating and identifying the microbes while fabricated anaerobic bio-digesters were used to ascertain the biogas production from the substrates. Analysis revealed that the pH varied between 6.30 to 7.20 and 5.0 to 6.2 before and during/after the anaerobic digestion respectively. Anaerobic bacteria isolated were identified as Enterobacter spp and Escherichia coli. The results showed 4850, 1430 and 1770 cm3 biogas production from the fresh, dried and cow dung co-seeded substrates respectively during the retention periods with a calorific value of 4773 kcal/kg. The volume of biogas produced varied significantly (p<0.05) between the substrate treatments and the digestion intervals (days). GC-MS analysis confirmed the identity of the produced methane. This study confirmed the role of bacteria as well as the capability of the substrate to produce biogas production in an in vitro bio-digester system.

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Microorganisms Associated with Biogas Production Using Vegetable (Telfairia occidentalis) Wastes, Banana Peel and Pig Dung as Substrates

Cited by 12 publications

References 0 publications

Modification of plastic tank for bio-digestion of food wastes for biogas generation for cooking foods

Modification of plastic tank for bio-digestion of food wastes for biogas generation for cooking foods

Utilization of Rumen Content by Indigenous Microorganisms in a Modified Anaerobic Digester

Study of the Microbial Composition and Comparative Biogas Production from Fresh, Dried and Cow-Dung Seeded Pumpkin (Cucurbita maxima) Residue

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