Improving biogas production from wheat plant using alkaline pretreatment

Taherdanak, Mohsen; Zilouei, Hamid

doi:10.1016/j.fuel.2013.07.094

Cited by 119 publications

(51 citation statements)

References 19 publications

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“…Phosphoric acid-and zinc chloride-modified teff straw show better porosity without much solid structure failure. SEM images ( Figure S1) support removal of hemicelluloses after phosphoric acid treatment, removal of lignin and hemicelluloses with cellulose swelling from sodium hydroxide treatment, and selective removal of hemicelluloses from zinc chloride treatments (Cao et al 1995a;Lopez-Linares et al 2013;Taherdanak and Zilouei 2014;Xu et al 2010). Different studies show separate decomposition assumption for biomass components.…”

Section: Adsorbent Characterizationmentioning

confidence: 91%

Chemical treatment of teff straw by sodium hydroxide, phosphoric acid and zinc chloride: adsorptive removal of chromium

Wassie

Srivastava

2016

Int. J. Environ. Sci. Technol.

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In this study, teff (Eragrostis tef) straw has been chemically treated and tested as an adsorbent for Cr(VI) removal. Chemically treatment of teff straw was done by NaOH, H 3 PO 4 and ZnCl 2 solutions. Scanning electron micrograph and X-ray diffraction were used for anatomical characterization, whereas Fourier transform infrared spectroscopy was used for surface change characterization of adsorbents. Effects of different experimental parameters like pH (2-12), initial Cr(VI) concentration (100-900 mg/L), adsorbent dose (2.5-20 g/L), contact time (15-360 min) and temperature (288-318 K) were studied. Temperature increment was found to stimulate the adsorption process. Langmuir isotherm was found to give better representation over wide range of temperature for untreated, H 3 PO 4 -as well as ZnCl 2 -treated teff straw, and Freundlich isotherm best represented the isotherm data for NaOH-treated teff straw. Maximum Cr(VI) adsorption capacity of untreated, NaOH-, H 3 PO 4 -and ZnCl 2 -treated teff straw was found to be 86.1, 73.8, 89.3 and 88.9 mg/g, respectively. Respective values of average effective diffusion coefficient (D e ) were found to be 2.8 9 10 -13 , 2.59 9 10 -14 , 1.32 9 10 -13 and 1.14 9 10 -13 m 2 /s, respectively. The negative value of DG o for all the adsorbents indicates Cr(VI) spontaneous adsorption. Isosteric heat of adsorption (DH st,a ) was found to vary with surface coverage (h). DH st,a increased for untreated, H 3 PO 4 -and ZnCl 2 -treated teff straw, and decreased steadily with h for NaOH-treated teff straw.

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Section: Adsorbent Characterizationmentioning

confidence: 91%

Chemical treatment of teff straw by sodium hydroxide, phosphoric acid and zinc chloride: adsorptive removal of chromium

Wassie

Srivastava

2016

Int. J. Environ. Sci. Technol.

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“…Bottles were tightly sealed and incubated in a water bath at 0 °C, 25 °C, 50 °C, 75 °C, and 100 °C for 24 h and were manually shaken every 3 h. It should be pointed that, for alkaline pretreatment, the optimal pretreatment time was significantly affected by the raw material size, alkaline dosage, and pretreatment temperature (Pei et al 2014;Taherdanak and Zilouei 2014). According to the cited work, 24 h was selected as the pretreatment time in this experiment.…”

Section: Alkaline Pretreatmentmentioning

confidence: 99%

“…While the pretreatment temperature has been clearly established as a key factor during alkaline hydrolysis (Mirahmadi et al 2010), the effect varies based on the feedstock characteristics. Taherdanak and Zilouei (2014) determined that the methane yield after NaOH pretreatment increased with temperature, but decreased beyond 75 °C. With antibiotic mycelial residues, the final cumulative methane yield after anaerobic digestion increased with rising pretreatment temperatures (60 °C to 100 °C) .…”

Section: Introductionmentioning

confidence: 99%

Alkaline Pretreatment of Banana Stems for Methane Generation: Effects of Temperature and Physicochemical Changes

et al. 2017

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The effects of NaOH pretreatment temperature on the physicochemical characteristics and methane production of anaerobically digested banana stems were investigated in this paper. With the increase of pretreatment temperature from 0 °C to 100 °C, the chemical oxygen demand (COD) of the soak liquid in the treated biomass approximately linearly increased from 5.9 g/L for the untreated stems to 34.0 g/L. A weight loss of 5.1% was observed for the untreated material, while it was up to 31.2% for the sample treated at 100 °C. The removal of lignin and hemicellulose accounted for the majority of the weight loss. The removal rates of lignin and hemicellulose increased from 15.0% to 41.6% and 1.9% to 23.6% when the treatment temperature increased from 0 °C to 100 °C, respectively. Moreover, the crystalline index (CI) of the banana stems also increased with rising temperature, resulting from the dissolution of amorphous cellulose with increasingly harsher alkaline environments. The optimal pretreatment temperature for banana stems was confirmed at 50 °C. In these conditions, methane was produced via anaerobic digestion with 239.9 mL/g total solid (TS) yield, which represented an increase of 66.7% over untreated banana stems.

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“…The width of this peak became wider after mesophilic digestion since the soluble organic acid, alcohols, monosaccharide and oligosaccharide were consumed. The band at 1734 cm À1 represents C@O stretching of acetyl or carboxylic acid between lignin and hemicelluloses (Taherdanak and Zilouei, 2014); the band at 1513 cm À1 corresponds to C@C stretching of aromatic ring of lignin; the bands at 1450, 1319, 1161, and 898 cm À1 corresponds to CAH 2 bending, CAH bending, CAOAC asymmetric stretching of carbohydrates and ß-glycosidic linkages of cellulose. The results of FTIR spectroscopy analysis are in agreement with chemical composition determination.…”

Section: Mechanism Of M-h-t Processmentioning

confidence: 99%