Influence of alkali pretreatment on morphological structure and methane yield of Arachis hypogea shells

Olatunji, Kehinde O.; Madyira, Daniel M.; Ahmed, Noor A.; Ogunkunle, Oyetola

doi:10.1007/s13399-022-03271-w

Cited by 13 publications

(23 citation statements)

References 54 publications

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“…Feedstock pretreatment methods before anaerobic digestion have been observed to be effective in enhancing feedstock degradation and biogas yield when appropriately selected. 76,151,107 Nevertheless, the transfer of most of these methods from the laboratory to the commercial scale is restricted by different technical, environmental, and economical challenges. 43,152 Each pretreatment technique's efficiency has been found to be influenced by the feedstock's microstructural configuration.…”

Section: Comparison Of Pretreatment Methodsmentioning

confidence: 99%

“…75 Different chemicals can be used for the chemical pretreatment of lignocellulose feedstock, and the process's efficiency depends on the substrate's microstructural arrangement. 76 Alkali and acid pretreatment methods are the primary chemical pretreatment techniques that have been studied extensively in macroalgae pretreatment. In some cases, chemical pretreatment methods are combined with heat for better efficiency.…”

Section: Chemical Pretreatmentmentioning

confidence: 99%

“…Lignin removal with the application of alkaline pretreatment has been very effective, but the percentage of cellulose remained high. 76 This method enhances the available surface area of the feedstock through fiber swelling and lower crystallinity. The process also degrades the bonds between the lignin and carbohydrate and causes interruption of the lignin structure.…”

Section: Chemical Pretreatmentmentioning

confidence: 99%

“…It was noticed that there was meaningful influence on the methane yield, 40 and this contradicts what was reported when a similar process was experimented with on lignocellulose feedstock. 76 Summarily, reports on chemicals pretreatment are limited and, most times, contradictory. Table 3 presents some chemical pretreatments’ effects on macroalgae biogas yield.…”

Section: Macroalgae Pretreatmentmentioning

confidence: 99%

See 3 more Smart Citations

Sustainable enhancement of biogas and methane yield of macroalgae biomass using different pretreatment techniques: A mini-review

Olatunji

Madyira

Amos

2023

Energy & Environment

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Macroalgae can be grown without the use of fertilizer, fresh water, or arable land. These qualities support its use for biofuel production because it frees up land for other traditional energy sources and food crops. It has been investigated as biogas feedstock to substitute for fossil fuels burning with attendant effects on the ecosystem. The microstructural arrangement of macroalgae biomass is restricting their conversion to biogas. Therefore, application of pretreatment before anaerobic digestion is needed to enhance their availability to microbial degradation and subsequent increase in biogas yield. Pretreatment application for substrate catalysis is vital to recovering eco-friendly and economical energy from macroalgae. This study summarizes the state of the art of various pretreatment methods employed to enhance macroalgae biomass's anaerobic digestion process. These methods were categorized as thermal, biological, chemical, nanoparticle additives, mechanical, and combined. Merits and challenges associated with each of these methods were also considered. The study shows that all the pretreatment methods considered can improve the biogas yield if the appropriate method is selected based on the type of macroalgae species. Pilot-scale studies that will assist in assessing their feasibility on the full-scale implementation are still missing.

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Section: Comparison Of Pretreatment Methodsmentioning

confidence: 99%

Section: Chemical Pretreatmentmentioning

confidence: 99%

Section: Chemical Pretreatmentmentioning

confidence: 99%

Section: Macroalgae Pretreatmentmentioning

confidence: 99%

See 2 more Smart Citations

Sustainable enhancement of biogas and methane yield of macroalgae biomass using different pretreatment techniques: A mini-review

Olatunji

Madyira

Amos

2023

Energy & Environment

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“…Agricultural residues are the most abundant, economical, and high biogas production potential feedstock that has been identified for biogas production. Groundnut shells are one of the agricultural residues that have been observed to have good potential for biogas generation because of their higher percentage of carbohydrates [5]. It is the by-product of groundnut processing and can be found in nearly all parts of the agricultural communities in the world.…”

Section: Introductionmentioning

confidence: 99%

Optimization of methane yield from co-digestion of alkalipretreated groundnut shells and duck waste using response surface methodology

Olatunji,

Madyira

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Anaerobic co-digestion of lignocellulose feedstock with livestock waste can assist in overcoming the challenges of digesting lignocellulose and balancing the nutrient contents of the process. This study investigated the optimum conditions for methane yield production from anaerobic co-digestion of alkali-pretreated groundnut shells and duck waste using Response Surface Methodology (RSM). A central composite design of the RSM model with three input variables of retention time, temperature, and substrate mixing ratio was used to set up the anaerobic digestion process. Individual and interactive influence of the three process parameters were examined. The result showed that all three process parameters considered are significant and determine the methane yield. The developed RSM model predicted a daily methane yield of 53.33 mL CH4/g VSadded for optimal conditions of 11 days, 26 °C temperature, and 50: 50 mixing ratio, which is not the same as the optimum methane yield observed from the experiment (54.26 mL CH4/g VSadded) and at different process conditions. Cumulative methane yields of 666.72 and 666.66 mL CH4/g VSadded were predicted and observed, respectively, which shows a very close range. The RSM coefficient of determination (R2) value of 0.8251 (82.51%) was observed, indicating a close fit between the predicted and observed yields. Analysis of variance (ANOVA) p < 0.0001 indicates that the developed model could be helpful in anaerobic co-digestion of lignocellulose materials and livestock waste. This study can be replicated at the industrial scale.

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Comparative Analysis of the Effects of Five Pretreatment Methods on Morphological and Methane Yield of Groundnut Shells

Olatunji

Madyira

2023

Waste Biomass Valor

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Agricultural residues have been identified as potential substrates for anaerobic digestion, which indicates them as alternative energy sources. But enzymatic hydrolysis of these residues has been observed as the rate-limiting step due to their recalcitrant characteristics. Therefore, pretreatment before anaerobic digestion is required to reduce the retention time and increase the methane yield. This study investigates the influence of thermal, alkali, acid, nanoparticle additive, and combined pretreatments on the methane yield of groundnut shells. The effect of pretreatment methods on the structural arrangement was investigated with scanning electron microscopy, X-ray diffraction, and Fourier transform infrared, and methane yield was investigated after anaerobic digestion at mesophilic temperature. The morphological analysis shows that all the treatment methods alter the microstructural arrangement of groundnut shells at varying degrees, except the particle size reduction, which does not significantly influence them. Cumulative methane yields of 222.92, 214.00, 171.02, 140.99, and 261.36 ml CH4/g VSadded were recorded for thermal, alkali, acid, nanoparticle additive, and combined pretreatment methods, which represents 112.77, 70.03, 40.18, and 159.85% improvement compared to the untreated substrate (100.58 ml CH4/g VSadded). Combined pretreatment was found to release the highest cumulative yield, and thermal pretreatment produced the least retention period. Therefore, combined and thermal pretreatments could be a bright means to deconstruct the recalcitrant characteristics of lignocellulose feedstocks arrangement to reduce the retention period and improve the methane yield. These methods can be experimented with further at the industrial scale to establish economic viability. Graphical Abstract

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Influence of alkali pretreatment on morphological structure and methane yield of Arachis hypogea shells

Cited by 13 publications

References 54 publications

Sustainable enhancement of biogas and methane yield of macroalgae biomass using different pretreatment techniques: A mini-review

Sustainable enhancement of biogas and methane yield of macroalgae biomass using different pretreatment techniques: A mini-review

Optimization of methane yield from co-digestion of alkalipretreated groundnut shells and duck waste using response surface methodology

Comparative Analysis of the Effects of Five Pretreatment Methods on Morphological and Methane Yield of Groundnut Shells

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