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What is the optimal retention time for cow dung in a biogas digester?

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The optimal retention time for cow dung in a biogas digester varies based on different studies. Research suggests that for anaerobic co-digestion of cow dung with agricultural and plant wastes, a retention time of 17 days is considered optimal for continuous production . Another study focusing on biogas production from cow dung found that a retention period of 30 days was used, with seasonal variations affecting biogas outflow . Additionally, an investigation into biogas generation from a mixture of sawdust and cow dung indicated a retention period of 20 days, showing increased gas yield with rising temperatures . Furthermore, a study on biogas production from cow dung reported a retention period of 50 days, with biogas production occurring within the mesophilic temperature range .

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Open access•Journal Article•DOI Experimental Characterization of Influential Parameters of Cow Dung Substrates in Biogas Production Noufou Bagaya, Issaka Ou´edraogo, Windé Nongué Daniel Koumbem, Younoussa Moussa Bald´e, Gwladys Wendwaoga Sandwidi, Sette Diop, Sié Kam - Show less +6 more 15 Jun 2023-Current Journal of Applied Science and Technology	The optimal retention time for cow dung in a biogas digester was 100 days at mesophilic temperature (27-38°C) in the study, resulting in a methane-rich biogas production.
Open access•Posted Content•DOI Production of biogas using waste products (Water Hyacinth and Cow Dung) 28 Mar 2023	The optimal retention time for cow dung in a biogas digester is 30 days, as indicated in the research using water hyacinth and cow dung for biogas production.
Open access•DOI Kinetics and Reactor Model of Biogas Production from Abattoir Waste (Cow Dung) Akpa Jackson Gunorubon, Igbagara Princewill Woyinbrakemi, Adeloye Olalekan Michael - Show less +2 more 06 Sep 2021	The optimal retention time for cow dung in a biogas digester was observed to be fifty days, resulting in successful biogas production.
Book Chapter•DOI Co-digestion of Agricultural and Plant Wastes and Cow Dung for Biogas Production 04 Jun 2022	The optimal retention time for cow dung in a biogas digester is approximately 17 days, as per the study on co-digestion of agricultural and plant wastes with cow dung.
Journal Article•DOI Biogas Production Using Cow Dung and Sawdust A. S. Adewuyi, J. R. Akinrele - Show less +1 more 31 Mar 2022-FUOYE Journal of Engineering and Technology	The optimal retention time for cow dung in a biogas digester is 20 days, as indicated in the study on biogas production using cow dung and sawdust.

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Why co-digestion of food waste and cow dung?4 answersCo-digestion of food waste and cow dung is beneficial due to the significant biogas production potential observed in various studies. Research has shown that co-digestion of food waste with cow dung results in higher biogas production compared to mono-digestion of cow dung. Additionally, the combination of food waste and cow dung in anaerobic digestion processes has demonstrated improved methane generation and synergistic effects, indicating enhanced energy recovery potentials. Furthermore, the utilization of food waste and cow dung in co-digestion processes contributes to the development of a sustainable circular economy by efficiently converting organic waste into valuable biogas. Overall, co-digestion of food waste and cow dung is a promising strategy for maximizing biogas production, energy recovery, and sustainable resource utilization.

What is the pH optimun for biogas production?5 answersThe optimal pH for biogas production varies depending on the specific conditions and waste materials being used. In one study, a pH of 7 was found to result in the highest biogas production, while a pH of 6.5 yielded the lowest biogas production. Another study found that a pH of 8.0 led to optimal methane production. Additionally, a pH of 10 was identified as the optimal pretreatment condition for biogas production from cassava wastewater. These findings suggest that the optimal pH for biogas production can range from slightly acidic to slightly alkaline, depending on the specific circumstances and waste materials being utilized.

Does cow dung have a buffering effect in anaerobic digestion?4 answersCow dung does have a buffering effect in anaerobic digestion. The addition of cow dung to the digestion process helps to stabilize the pH of the system. This is important because maintaining a stable pH is crucial for the activity of the microorganisms involved in the digestion process. The buffering effect of cow dung helps to prevent any drastic changes in pH that could inhibit the microbial activity and reduce biogas production. Additionally, cow dung provides a source of nutrients and trace elements that are essential for the growth and activity of the microorganisms. These nutrients and trace elements contribute to the overall efficiency of the anaerobic digestion process and enhance biogas production. Therefore, cow dung plays a significant role in providing buffering capacity and supporting the microbial activity in anaerobic digestion.

What is the effect of metal ions on biogas production from cow dung?5 answersThe effect of metal ions on biogas production from cow dung has been studied in several papers. Sliem et al. found that nanoferrites MFe2O4 (M = Fe, Ni, Co) increased biogas production rate, with cobalt ferrite (CoFe2O4) nanoparticles showing the greatest enhanced effect. Taha et al. also investigated the impact of nanoparticle mixtures of Fe, Ni, and Co on biogas production from anaerobic digestion of cattle manure. They found that the addition of nanoparticle mixtures of Fe and Ni increased biogas production by 14.61% compared to control, while the addition of nanoparticle mixtures of Fe, Ni, and Co increased CH4 production by 19.30%. Additionally, Zhang et al. studied the effect of ferrous ions (Fe2+) on the anaerobic co-digestion of cow dung and Phragmites straw. They found that Fe2+ addition increased cumulative biogas yields by 18.1% and improved cellulase activities, leading to higher biogas production.

What are the effects of retention time and concentration on methane production from chicken manure?5 answersRetention time and concentration have significant effects on methane production from chicken manure. Increasing the hydraulic retention time (HRT) from 9.09 to 2.74 days resulted in a maximal methane yield of 0.21 LCH4 gVS−1. Similarly, a short HRT of 3.38 to 4.66 days, combined with a high free ammonia concentration, led to maximal methane yields of 0.22 LCH4 gVS−1. These methane yields correspond to the production of 40.36 to 42.28 cubic meters of methane per ton of poultry manure. In terms of concentration, the total biogas yield decreased when chicken manure contained antibiotics such as Staphylococcus aureus and chlortetracycline. However, the biomethane productivity was optimal when chlortetracycline concentration was 60 mg/kg or less, while higher concentrations inhibited biomethane production. Additionally, anaerobic co-digestion of 10% primary sludge with 90% chicken manure increased the biogas yield. Therefore, optimizing retention time and controlling concentration are crucial for maximizing methane production from chicken manure.

What are the key factors affecting the efficiency of biogas production from cow dung?5 answersThe key factors affecting the efficiency of biogas production from cow dung include temperature, pH, and nutrient addition to the substrate. The optimal temperature for mesophilic operation of the bioreactor is around 35°C. A mesophilic temperature range of 25-35°C is recommended for best yield. The pH should be maintained at around 8 for optimal biogas production. Additionally, the addition of nutrients such as CaCO3 and NH3 in the ratio of 5g: l dm3 can enhance biogas yield. These factors contribute to the successful anaerobic digestion of cow dung, resulting in the production of a large quantity of flammable biogas.

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