Bioconversion of Egypt's Agricultural Wastes into Biogas and Compost

Elfeki, Mohamed; El-Bestawy, Ebtesam; Tkadlec, Emil

doi:10.15244/pjoes/69938

Cited by 18 publications

(11 citation statements)

References 38 publications

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“…These categories accord to the solid waste contents like organic materials, glass, metal, plastic and paper, or their hazardous potentials such as toxic, ammable, radioactive, infectious substances, etc. In addition, the density of solid waste varies based on the point of measurement (at source, during transportation or at disposal) (2).…”

Section: Introductionmentioning

confidence: 99%

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Synergetic Physical Freezing and Chemical Pretreatment of Lignocellulosic Sugarcane Bagasse Followed by Enzymatic Hydrolysis

Farghaly

Ahmed²,

Gad

2021

Preprint

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This study focuses on employing an eco-friendly pretreatment approach for lignocellulosic Sugarcane Bagasse (SCB) as a major problematic solid waste in Egypt, complying with the standard legislation as well. The applied technique depended on SCB physical fractionation via freezing, followed by chemical hydrolysis using alkaline hydrogen peroxide (AHP) and enzymatic hydrolysis. The changes occurred in macrostructure and the entire lignocellulosic compounds during the pretreatment stages were evaluated. Freezing fractionation resulted in relatively low glucose yield and saccharification ratio at -20°C for 2 h of 307.52 mg/gm native SCB and 48.5%, respectively, where no total reducing sugars (TRS) was obtained. Further AHP pretreatment was performed for the frozen-fractionated SCB at -20°C and 2 h with assistance of Box–Behnken Design response surface methodology (RSM). The investigated key parameters were H2O2 concentration (3, 5.5 and 8 %v/v), temperature (25, 42.5 and 60°C) and pretreatment duration (1, 3 and 5 h). The results revealed that the statistical modelling was able to predict the response of glucose yield and TRS production with R2 = 0.8221 and 0.8814, respectively. Applying the optimization tool of RSM, the optimum predicted values of glucose yield and TRS production were (886.51 mg/gm native SCB and 1.44 mg/mL), respectively; confirmed by the experimental analysis (898.5 mg/gm native SCB and 1.32 mg/mL), respectively. The coincided saccharification ratio was 97.5%. These results were obtained at H2O2 of 3 % (v/v), 56.93°C and 1 h which were 4.32 and 2.01 times higher than that obtained during the freezing pretreatment phase for glucose yield and saccharification ratio, respectively.

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Section: Introductionmentioning

confidence: 99%

“…2 -0.001629 X 1 * X 2 + 0.02350 X 1 * X 3 -0.003107 X 2 * X 3 ………………………………………..……………….. Eq. (5) 2 concentration and prolonged time obtained stronger degradation of SCB…”

mentioning

confidence: 99%

Synergetic Physical Freezing and Chemical Pretreatment of Lignocellulosic Sugarcane Bagasse Followed by Enzymatic Hydrolysis

Farghaly

Ahmed²,

Gad

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…These categories accord to the solid waste contents like organic materials, glass, metal, plastic and paper, or their hazardous potentials such as toxic, flammable, radioactive, infectious substances, etc. In addition, the density of solid waste varies based on the point of measurement (at source, during transportation or at disposal) (Elfeki et al 2017). The Egyptian agricultural waste amount ranges from 30-35 million tons per year.…”

Section: Introductionmentioning

confidence: 99%

Synergistic physic-chemical pretreatment of lignocellulosic sugarcane bagasse via freezing and alkaline processes

2021

JES. Journal of Engineering Sciences

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This study focuses on employing a hybrid pre-treatment approach for lignocellulosic Sugarcane Bagasse (SCB) as a major problematic solid waste. The applied technique depended on SCB physical pre-treatment via freezing, followed by chemical hydrolysis using alkaline hydrogen peroxide (AHP) and enzymatic hydrolysis. The changes occurred in macrostructure and the entire lignocellulosic compounds during the pretreatment stages were evaluated. Freezing pre-treatment resulted in relatively low glucose yield and saccharification ratio at -20 °C for 2 h of 307.52 mg/gm native SCB and 48.5%, respectively. Further AHP pretreatment was performed for the frozen-pre-treated SCB at -20 °C and 2 h with assistance of Box-Behnken Design response surface methodology (RSM). The investigated key parameters were H2O2 concentration (3, 5.5 and 8 %v/v), temperature (25, 42.5 and 60 °C) and pre-treatment duration (1, 3 and 5 h). The results revealed that the statistical modelling was able to predict the response of glucose yield and TRS production with R2 = 0.8221 and 0.8814, respectively. Applying the optimization tool of RSM, the optimum predicted values of glucose yield and TRS production were (886.51 mg/gm native SCB and 1.44 mg/mL), respectively; confirmed by the experimental analysis (898.5 mg/gm native SCB and 1.32 mg/mL), respectively. The coincided saccharification ratio was 97.5%. These results were obtained at H2O2 of 3 % (v/v), 56.93 °C and 1 h which were 4.32 and 2.01 times higher than that obtained during the freezing pre-treatment phase for glucose yield and saccharification ratio, respectively. The results are higher that obtained in the literature for SCB with 2% (v/v) H2O2 at 30°C for 8 h. Therefore, The AHP following freezing pre-treatment proved the efficient break down of esterified linkage in the lignocellulosic matrix and deacetylation of hemicellulose during the process.

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“…Agricultural wastes according to Elfeki et al, (2017) is classified as one of the problems of the present era in Egypt, where the amount of these wastes is about 46.7 million tons/ year while, about 52% of the agricultural residues are unused. Solid wastes production reaches millions of tons annually from many different sources such as industrial, agricultural and municipal (Global Waste Management Market Assessment, 2007).…”

Section: Introductionmentioning

confidence: 99%

Effect of Digestion Temperature and Stirring Time on Biogas Properties Using Vertical and Horizontal Units

El-latif

El-Hadidi

Nazmi

2020

Journal of Soil Sciences and Agricultural Engineering

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This work was carried out in order to compare the performance of two digesters types (horizontal and vertical) for biogas production from animal wastes as a source of renewable energy at the biogas laboratory of the Agricultural Engineering Department, Faculty of Agriculture, Mansoura University. Daily biogas production and its content of methane was recorded. The biogas production rate, productivity and the calorific value were determination during batch process anaerobic digestion of buffalo dung. Three different digestion temperatures (35 ºC, 40 ºC and 45 ºC) with stirring time of 15 minutes every 2 hours and total solid of 12% were investigated to identify the optimal digestion temperature (O.D.T). The optimal digestion temperature was used with two different stirring times (15 minutes every 3 hours and 15 minutes every 4 hours daily) to define the optimal condition for biogas productivity. The stirring speed for all experiments was adjusted at 120 rpm and hydraulic retention time of 60 days. Chemical analysis and biochemical oxygen demand (BOD) of influent and effluent slurries were also carried out. The obtained results indicated that, biogas production from vertical digester is more than that from horizontal one. It is recommended to use temperature of 40 ºC with stirring time 15 minutes every 3 hours at total solid of 12% and stirring speed of 120 rpm. According to chemical analysis, the effluent slurry of different experiments could be used as a good organic fertilizer. It contains high concentration of plant nutrients and organic matter and it had tendency to give higher crop yield and soil microbial activities.

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Bioconversion of Egypt's Agricultural Wastes into Biogas and Compost

Cited by 18 publications

References 38 publications

Synergetic Physical Freezing and Chemical Pretreatment of Lignocellulosic Sugarcane Bagasse Followed by Enzymatic Hydrolysis

Synergetic Physical Freezing and Chemical Pretreatment of Lignocellulosic Sugarcane Bagasse Followed by Enzymatic Hydrolysis

Synergistic physic-chemical pretreatment of lignocellulosic sugarcane bagasse via freezing and alkaline processes

Effect of Digestion Temperature and Stirring Time on Biogas Properties Using Vertical and Horizontal Units

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