Feasibility of Biogas Production from Cowpea Hull Anaerobic Digestion: Effect of Co-digestion with Waste-activated Sludge and Rice Straw

Ogbonna, Christian Toochukwu; Andole, Ondiba Hesborn; Zhang, Zhenya

doi:10.12691/rse-10-1-2

Cited by 2 publications

(6 citation statements)

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“…Afterward, the gas chromatographs (GC-8A, Shimadzu, Japan) equipped with a thermal conductivity detector gauged at 80°C and (Porapak Q column) and 60°C with N 2 as carrier gas was used to analyze the biomethane content of the total gas. Lastly, the methane content was multiplied by the total gas produced to obtain the biomethane production (Ogbonna et al, 2022). After the fermentation period, all samples of cowpea hull, waste-activated sludge, and inoculum were analyzed for their parameters, including pH, TS, VS, total nitrogen (TN), and total carbon (TC) according to the standard method (APHA, 1998).…”

Section: Methodsmentioning

confidence: 99%

“…In the rst batch experiment, three samples were prepared to investigate the effect of thermal pretreatment indicated in Table 1. First, 3 grams of cowpea hull was co-digested with waste-activated sludge at the mixing ratio 3:1, which was found to be the optimum ratio in the study of Ogbonna et al (2022). Next, 2 g of digested sewage sludge was added as an inoculum based on VS content.…”

Section: Batch Anaerobic Digestion Setupmentioning

confidence: 99%

“…Therefore, it requires pretreatment before consumption; and consists of 30% of ruminant diets (Abebe & Alemayehu, 2022). After treatment and consumption, the hull remains and adds to food waste (Ogbonna et al, 2022). The high carbon and nitrogen content in cowpea hull and its respective methane generation in the works of Ukpai & Nnabuchi and Ogbonna et al makes it suitable for biogas production (Ukpai & Nnabuchi, 2012;Ogbonna et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…After treatment and consumption, the hull remains and adds to food waste (Ogbonna et al, 2022). The high carbon and nitrogen content in cowpea hull and its respective methane generation in the works of Ukpai & Nnabuchi and Ogbonna et al makes it suitable for biogas production (Ukpai & Nnabuchi, 2012;Ogbonna et al, 2022). Subsequently, vaporization is recommended as a sustainable waste management tool.…”

Section: Introductionmentioning

confidence: 99%

“…The results yielded 67.9, 56.2, and 51.4% of methane. Conversely, Ogbonna et al found that co-digestion of cowpea hull with either waste-activated sludge or rice straw increases total methane production; that is, 18.95% with WAS, or 27.05% with rice straw, correspondingly (Ogbonna et al, 2022). Though these experiments have proven CH's bene t as a suitable material for biogas output, limited study has been conducted in this area.…”

Section: Introductionmentioning

confidence: 99%

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Effect of thermal pretreatment and nanobubble addition water on methane production from cowpea hull anaerobic digestion

Ogbonna,

Richards,

Helmut

2023

Res Chem Intermed

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Cowpea hull (CH) is a by-product of cowpea food processing; its conventional use as animal feed hay declined due to atulence characteristics. Therefore, sustainable utilization of CH for biogas production was investigated. Speci cally, the effects of thermal pretreatment and nanobubble water (NBW) addition were examined during CH's co-digestion with waste-activated sludge for methane production. Oven-dried CH at 105 ℃ for 3 hours or 48 hours resulted in 83% moisture content reduction (MCR) or 100% MCR, respectively, and untreated CH at 81% moisture content was simultaneously set up as a control experiment. After 16 days of mesophilic anaerobic digestion (AD), The 100% MCR enhanced biogas production by 11% (219.14 mL/g − VS) compared to the untreated (197.93 mL/g − VS). In addition, 104.26, 114.41, and 116.15 mL/g − VS methane were produced from the untreated CH and two portions of thermally treated samples, correspondingly. Similarly, by adding N 2 -NBW, biogas production increased progressively, reaching the maximum daily value of 64.51 mL/d on day 3. As a result, the total accumulated biogas production from the N 2 -NBW reactor was 242.7 mL/g − VS, approximately 9.7 mL/g − VS more biogas and 10% increased methane production compared to 100% MCR when deionized water was applied. On the contrary, Air-NBW decreased methane production. Furthermore, the results reveal that 47.13 to 68.90 million m 3 of biogas generated by cofermentation of untreated and thermally treated CH with WAS can be converted to 75.36 GWh, which displaces 0.27% of the total fossil fuelbased electricity capacity generated in 2020. Besides, the green energy generated can mitigate methane emissions by recycling organic waste that would otherwise be land lled.

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Section: Methodsmentioning

confidence: 99%

Section: Batch Anaerobic Digestion Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of thermal pretreatment and nanobubble addition water on methane production from cowpea hull anaerobic digestion

Ogbonna,

Richards,

Helmut

2023

Res Chem Intermed

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Optimization of Methane production from Cowpea Hull Anaerobic Co-Digestion: Moisture Content Reduction and Nanobubble Water Addition

Ogbonna,

Richards,

Helmut

2023

Preprint

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Cowpea hull (CH) is a by-product of cowpea food processing; its conventional use as animal feed hay declined due to flatulence characteristics. Therefore, sustainable utilization of CH for biogas production was investigated. Specifically, the effects of thermal pretreatment and nanobubble water (NBW) addition were examined during CH's co-digestion with waste-activated sludge for methane production. Oven-dried CH at 105 ℃ for 3 hours or 48 hours resulted in 83% moisture content reduction (MCR) or 100% MCR, respectively, and untreated CH at 81% moisture content was simultaneously set up as a control experiment. After 16 days of mesophilic anaerobic digestion (AD), The 100% MCR enhanced biogas production by 11% (219.14 mL/g−VS) compared to the untreated (197.93 mL/g−VS). In addition, 104.26, 114.41, and 116.15 mL/g−VS methane were produced from the untreated CH and two portions of thermally treated samples, correspondingly. Similarly, by adding N2-NBW, biogas production increased progressively, reaching the maximum daily value of 64.51 mL/d on day 3. As a result, the total accumulated biogas production from the N2-NBW reactor was 242.7 mL/g−VS, approximately 9.7 mL/g−VS more biogas and 10% increased methane production compared to 100% MCR when deionized water was applied. On the contrary, Air-NBW decreased methane production. Furthermore, the results reveal that 47.13 to 68.90 million m3 of biogas generated by co-fermentation of untreated and thermally treated CH with WAS can be converted to 75.36 GWh, which displaces 0.27% of the total fossil fuel-based electricity capacity generated in 2020. Besides, the green energy generated can mitigate methane emissions by recycling organic waste that would otherwise be landfilled.

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Feasibility of Biogas Production from Cowpea Hull Anaerobic Digestion: Effect of Co-digestion with Waste-activated Sludge and Rice Straw

Cited by 2 publications

References 0 publications

Effect of thermal pretreatment and nanobubble addition water on methane production from cowpea hull anaerobic digestion

Effect of thermal pretreatment and nanobubble addition water on methane production from cowpea hull anaerobic digestion

Optimization of Methane production from Cowpea Hull Anaerobic Co-Digestion: Moisture Content Reduction and Nanobubble Water Addition

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