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Anaerobic digestion of cow dung for biogas production  [PDF]
Baba Shehu Umar Ibn Abubakar,Nasir Ismail
Journal of Engineering and Applied Sciences , 2012,
Abstract: The effectiveness of cow dung for biogas production was investigated, using a laboratory scale 10L bioreactor working in batch and semi-continuous mode at 53oC. Anaerobic digestion seemed feasible with an organic loading of up to 1.7 kg volatile solids (VS)/L d and an HRT of 10 days during the semi-continuous operation. The averaged cumulative biogas yield and methane content observed was 0.15 L/kg VS added and 47 % respectively. The TS, VS and COD removals amounted to 49%, 47% and 48.5%, respectively. The results of the VS/TS ratio showed very small variation, which denote adequate mixing performance. However there was some evidence of ammonia inhibition probably due to the uncontrolled pH employed. The data obtained establish that cow dung is an effective feedstock for biogas production achieving high cumulative biogas yield with stable performance. The future work will be carried out to study the effect of varying organic loading rate on anaerobic digestion of cow dung in a semi-continuous mode.
Effect of Waste Paper on Biogas Production from Co-digestion of Cow Dung and Water Hyacinth in Batch Reactors
OIY Momoh, LI Nwaogazie
Journal of Applied Sciences and Environmental Management , 2007,
Abstract: The effect of waste paper on biogas production from the co-digestion of fixed amount of cow dung and water hyacinth was studied at room temperature in five batch reactor for over 60 days. Waste paper addition was varied for a fixed amount of cow dung and water hyacinth until maximum biogas production was achieved. Biogas production was measured indirectly by water displacement method. The production of biogas showed a parabolic relationship as the amount of waste paper (g) increased with a goodness of fit of 0.982. Maximum biogas volume of 1.11liters was observed at a waste paper amount of 17.5g which corresponded to 10.0% total solids of the biomass in 250ml solution. Thus, an optimum waste paper amount of 17.5g needs to combine with 5g of cow dung and 5g of water hyacinth in 250ml of water for maximum biogas production. Similar equivalents in kilograms and tonnes can be utilized in large-scale production of biogas which can provide decentralized source of fuel for university laboratories and also local supply of energy for electricity production. Also, the air pollution problems associated with open burning of waste papers can be eliminated. The biogas process has established to be cheap and practically feasible.
Effect of Waste Paper on Biogas Production from Co-digestion of Cow Dung and Water Hyacinth in Batch Reactors
OLY Momoh, LI Nwaogazie
Journal of Applied Sciences and Environmental Management , 2008,
Abstract: The effect of waste paper on biogas production from the co-digestion of fixed amount of cow dung and water hyacinth was studied at room temperature in five batch reactor for over 60 days. Waste paper addition was varied for a fixed amount of cow dung and water hyacinth until maximum biogas production was achieved. Biogas production was measured indirectly by water displacement method. The production of biogas showed a parabolic relationship as the amount of waste paper (g) increased with a goodness of fit of 0.982. Maximum biogas volume of 1.11liters was observed at a waste paper amount of 17.5g which corresponded to 10.0% total solids of the biomass in 250ml solution. Thus, an optimum waste paper amount of 17.5g needs to combine with 5g of cow dung and 5g of water hyacinth in 250ml of water for maximum biogas production. Similar equivalents in kilograms and tonnes can be utilized in large-scale production of biogas which can provide decentralized source of fuel for university laboratories and also local supply of energy for electricity production. Also, the air pollution problems associated with open burning of waste papers can be eliminated. The biogas process has established to be cheap and practically feasible
Biogas Production from the Co-Digestion of Cornstalks with Cow Dung and Poultry Droppings  [PDF]
I. J. Ona, S. M. Loya, H. O. Agogo, M. S. Iorungwa, R. Ogah
Journal of Agricultural Chemistry and Environment (JACEN) , 2019, DOI: 10.4236/jacen.2019.83012
Abstract: The Anaerobic digestion of Corn Stalk (CS) with Cow Dung (CD) and Poultry Droppings (PD) was investigated. Batch mono-digestion and Co-digestion experiments were performed with initial total solid loading of 37.5%. The main objective of this work was to investigate the biogas yield at different CS to CD ratios and CS to PD ratios. Results show that the highest Cumulative Gas Yield (CGY) of 6833 mL/g of biomass was achieved in 21 days for CS-CD ratio of 2:1. Similarly high CGY of 6107 mL/g, 6100 mL/g and 5333 mL/g were obtained for CS-PD ratio of 2:1, CS-CD ratio of 1:1 and CS-PD ratio of 1:1 respectively. It is concluded that co-digestion of Cow dung or poultry droppings is beneficial for improving bio-digestibility and Biogas yield from corn stalk. The results of this work provide useful information to improve the efficiency of co-digestion of CS with CD and PD under anaerobic conditions.
Influence of catalyst (Yeast) on the Biomethanization of Selected Organic Waste Materials
BU Bagudo, SM Dangoggo, LG Hassan, B Garba
Nigerian Journal of Basic and Applied Sciences , 2010,
Abstract: Yeast catalyzed the rate of biomethanization of waste materials and rate at which it alter the reaction rate has been determined. It was observed that addition of yeast improved the quality and quantity of biogas generated and also fastened the acid and methane forming stages during biomethanization. The volumes of biogas in the catalyzed process was found to be 6550 cm3 for cow dung, 5640 cm3 for millet husk, 3240 cm3 for rice husk ,1000 cm3 for saw dust and 800 cm3 for the paper waste, as against 5430 cm3, 5230 cm3, 2110 cm3, 950 cm3 and 590 cm3 respectively for the uncatalyzed biomethanization process.
Kinetics studies of fungal biogas production from certain agricultural waste
U Bishir, MM Ekwenchi
Bayero Journal of Pure and Applied Sciences , 2012,
Abstract: Anaerobic degradation of sugar cane and rice husk by cellulolytic fungus was studied respectively at optimum operational condition of concentration, 1:5 w/v of the lignocelluloses: water and temperature of 33oC. The average rates of biogas production determined for sugar cane and rice husk were 57cm3per day and 47cm3 per day, while the yield of biogas evaluated appear to be high, 15.2% for sugar cane and 12.5% for rice husk. The yields from other agricultural wastes were lower than these values (0.8% cow dung – 11.6% water hyacinth). The compositional yields of the biogas were also assessed; 5.7% CH4, 8.3% CO2, and 1.2% H2 S for sugar cane and 4.9% CH4, 6.1% CO2 and 1.5% H2 S for rice husk. Results have shown that the biogas of rice husk is of better quality than that of sugar cane because of its lower content of CO2. It was also found that when the amount of the substrates were respectively doubled, the average rate of the biogas production doubled, implying that kinetically, the degradation is probably first order. The yield of the bioliquid for sugar cane was determined as 94% and rice husk was 68%. Key word: Biogas, Fungal Degradation, Bioliquid, Rice Husk, Sugarcane.
Experimental Study of Biogas Production from Cow Dung as an Alternative for Fossil Fuels  [PDF]
Moutaz Benali, Tarek Hamad, Yousif Hamad
Journal of Sustainable Bioenergy Systems (JSBS) , 2019, DOI: 10.4236/jsbs.2019.93007
Abstract: To treat the problem of fossil fuel usage and greenhouse gas emissions, biogas is considered a potential source of clean renewable energy. The aim of the work is to analyze the amount of biogas and ph from cow dung when an anaerobic digester operates in the mesophilic mode. In this study is presented the experimental investigation of biogas production from cow dung as an alternative energy resource. This is work using an 18 Liters capacity plastic as prototype biogas plant, plant to inspect the anaerobic digestion in producing biogas. The digester was batch operated and daily gas produced from the plant was observed for 30 days. The digester was fed within the ratio of 1:1 of dung to water respectively. The operating temperatures of the digester were maintained within mesophilic conditions. The Biogas production from cow dung fluctuates from the first day to the thirtieth day between 0 and 340 ml. The pH of cow dung is gradual reduction within the retention period.
Potentials for Biogas Production in Anambra State of Nigeria Using Cow Dung and Poultry Droppings  [PDF]
C. E. Umeghalu., E. C. Chukwuma, I. F. Okonkwo and S. O. Umeh
International Journal of Veterinary Science , 2012,
Abstract: Preliminary investigation of the major abattoirs and poultry farms in Anambra State was undertaken to determine the quantity of cow dung and poultry dropping generation with respect to biogas production. The study showed that about 15563 kg (15.6 tons) of fresh cow manure and about 2012 kg (2.01 tons) are produced daily in the state. These are sufficient to support biogas production in the state. Investigation shows that most of these manures are not properly managed resulting to environmental pollution. Result shows that only negligible proportion of these manures are used as manure for vegetable crops and feed stock for fish farming. Thus, there is need to popularize biogas technology which is a cheap and renewable source of energy whose effluent is a good fertilizer for crop growing.
Development of a Batch-Type Biogas Digester Using a Combination of Cow Dung, Swine Dung and Poultry Dropping  [PDF]
Olawale O. Olanrewaju, Obafemi O. Olubanjo
International Journal of Clean Coal and Energy (IJCCE) , 2019, DOI: 10.4236/ijcce.2019.82002
Abstract: The overdependence on crude oil in African countries warrants the need for alternative sources of energy. A 56-litre-capacity biogas digester was designed, fabricated and evaluated. Investigations were made into the production of biogas from the mixture of cow dung, swine dung and poultry dropping. Standard equations and models were used in the design of the components of the manually operated digester. The digester temperature, ambient temperature and pH were monitored during the experiment. The proximate analysis showed that volatile solid, total solid and moisture content for the mixed substrates at the initial stage were: 64.7%, 83.5% and 13.5% respectively. Similarly, at the digestion stage, the volatile solid, total solid and moisture content were: 54.1%, 22.6% and 74.4% respectively. Advancement of decomposition leads to gradual increasing pH value from 7.2 to 7.4, which indicates the stability of organic matter. The moisture content on a wet basis was initially 13.5%. This value latter increased to 74.4%. On the average, 15 kg of mixed substrates with 25 litres of impure water produced biogas within 25 days of digestion. The gas produced from mixed substrates became flammable with blue flame after 16 days of production, indicating that the ratio of methane gas generated with the three mixtures of fresh animal waste was higher than other gases produced.
Dry Anaerobic Digestion of Cow Dung for Methane Production: Effect of Mixing  [PDF]
Ajay Kumar Jha,Jianzheng Li,Qiaoying Ban,Liguo Zhang
Pakistan Journal of Biological Sciences , 2012,
Abstract: The performance characteristics of a dry batch reactor with a blender treating cow dung has been evaluated for 35 days in a single-stage batch reactor of 3 L effective volume at 35±1°C to investigate the effect of continuous-mixing on biogas production and organic materials removal. The results showed that the performance of unmixed and mixed digesters was quite different and the dry digester with mixing system produced methane of 0.358 LCH4/gVSr which was 7.50% higher than that for unmixed digester. Moreover, the organic material removal efficiency was increased by 9.73% in term of VS. The wide diversity of prominent bacteria and methanogenic archaea affiliated with all steps along the anaerobic degradation pathway made the process stable. But the dry digester with mixing system during start up was not beneficial, as it resulted in relatively higher volatile fatty acids, higher volatile fatty acid to alkalinity ratio, lower pH and consequently prolonged start up time.
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