Optimization of soaking in aqueous ammonia pretreatment for anaerobic digestion of African maize bran

Cayetano, Roent Dune A.; Oliwit, Abura Tobby; Kumar, Gopalakrishnan; Kim, Jun Seok

doi:10.1016/j.fuel.2019.05.051

Cited by 17 publications

(6 citation statements)

References 21 publications

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“…NH 4 OH pretreatment does not cause hemicellulose degradation compared to other alkaline agents. A similar result was displayed by Cayetano et al Additionally, previous studies have found that residual NH 4 OH concentrations would be toxic to bacteria, , which would be an obstacle for bioconversion of lignocellulosic biomass.…”

Section: Resultssupporting

confidence: 82%

Comparative Study on Pretreatment Processes for Different Utilization Purposes of Switchgrass

et al. 2020

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Switchgrass ( Panicum virgatum , L., Poaceae) with the advantages of high cellulose yield, and high growth even under low input and poor soil quality, has been identified as a promising candidate for production of low-cost biofuels, papermaking, and nanocellulose. In this study, 12 chemical pretreatments on a laboratory scale were compared for different utilization purposes of switchgrass. It was found that the pretreated switchgrass with sodium hydroxide showed considerable potential for providing mixed sugars for fermentation with 11.10% of residual lignin, 53.85% of residual cellulose, and 22.06% of residual hemicellulose. The pretreatment with 2.00% (v/v) nitric acid was the best method to remove 78.37% of hemicellulose and 39.82% of lignin under a low temperature (125 °C, 30 min), which can be used in the production of nanocellulose. Besides, a completely randomized design analysis of switchgrass pretreatments provided the alternative ethanol organosolv delignification of switchgrass for the papermaking industry with a high residual cellulose of 58.56%. Finally, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR) were carried out to confirm the changes in functional groups, crystallinity, and thermal behavior of the three materials, respectively, from the optimal pretreatments.

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Section: Resultssupporting

confidence: 82%

Comparative Study on Pretreatment Processes for Different Utilization Purposes of Switchgrass

et al. 2020

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“…Wang et al stated that the supplement of free ammonia amplified methane production in AD as well as enhanced digestion of sludge [23]. The aqueous ammonia soaking (AAS) method that involved removing and recycling ammonia streams was reported by several researchers to increase biogas production [24,25]. Jurado et al reported that pretreatment of swine manure by the AAS method caused an increase in biogas production by 178 % in 3 days of digestion [24].…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al used free ammonia and heat pretreatment of waste sludge to improve biogas production and reported that ammonia treatment enhanced the hydrolysis rate and increased the biochemical methane potential of waste [26]. Cayetano et al studied soaking in aqueous ammonia method for the pretreatment of maize bran biomass to improve digestion and reported that pretreatment caused a rise in methane yield and methane production rate of AD [25]. Luo et al used urea at different concentrations to increase nitrogen content to reduce the C/N ratio of rice straw.…”

Section: Introductionmentioning

confidence: 99%

“…stated that the supplement of free ammonia amplified methane production in AD as well as enhanced digestion of sludge [23]. The aqueous ammonia soaking (AAS) method that involved removing and recycling ammonia streams was reported by several researchers to increase biogas production [24, 25]. Jurado et al.…”

Section: Introductionmentioning

confidence: 99%

“…Cayetano et al. studied soaking in aqueous ammonia method for the pretreatment of maize bran biomass to improve digestion and reported that pretreatment caused a rise in methane yield and methane production rate of AD [25]. Luo et al.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Nitrogen Content in Food Waste on Biogas Production

Karne,

Bhatkhande

2024

Chem Eng & Technol

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High carbon content and high‐level biodegradability are major constraints of the anaerobic digestion of food waste. In the present study, anaerobic digestion of model food waste was carried out in a fed batch digester. Nitrogen content in model food waste was adjusted by the addition of ammonium chloride at the desired C/N ratio. Biogas production at ammonium chloride percentages of 0, 0.8, 1.5, 2.14, and 3.2 % (weight basis) were carried out under mesophilic conditions in a pilot plant scale floating drum digester. At an ammonium chloride percentage of 1.5 % that balances C/N ratio 25, highest biogas production of 0.42 m3 kg−1 of VS was attained while biogas production from food waste without ammonium chloride of 0.06 m3 kg−1 of VS was obtained. The highest methane yield of 0.323 m3 kg−1 of VS was found at ammonium chloride of 1.5 % while methane yield of 0.042 m3 kg−1 of VS was achieved from food waste without ammonium chloride. The highest percent increase CH4 yield of 669 % was obtained at an ammonium chloride percentage of 1.5 %. Biogas productivity obtained at ammonium chloride percentage of 1.5 % was 0.6 L L−1 d−1. Hence, the optimum ammonium chloride percentage obtained was 1.5 % which balances the C/N ratio at 25.

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