Eco-friendly pulping of wheat straw using crude xylano-pectinolytic concoction for manufacturing good quality paper

Varghese, Libin Mathew; Agrawal, Shivankar; Nagpal, Raksha; Mishra, O. P.; Bhardwaj, Nishi Kant; Mahajan, Ritu

doi:10.1007/s11356-020-10119-1

Cited by 17 publications

(8 citation statements)

References 12 publications

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“…The enzymatic pretreatment resulted in a 15.67%reduction in Kappa number, and the pulp brightness was improved 16.04%. Moreover, the pulping chemical requirement decreased 12% relative to the control (without enzyme treatment) (Varghese et al 2020a).…”

Section: Xylanase Treatmentmentioning

confidence: 87%

“…Similarly, the enzyme treatment also reduced the requirement of active alkali by 15% to attain a Kappa number similar to that obtained with 100% active alkali (Varghese et al2020b). In another study, the pretreatment of wheat straw was performed with a crude xylano-pectinolytic concoction with a xylanase dose of 400 IU/g wheat straw and a pectinase dose of 120 IU/g wheat straw at 55 °C for 3 h of treatment (Varghese et al 2020a). The enzymatic pretreatment resulted in a 15.67%reduction in Kappa number, and the pulp brightness was improved 16.04%.…”

Section: Xylanase Treatmentmentioning

confidence: 99%

“…If enzyme is used as a pretreatment agent, such limitations of biopulping can be avoided. Recently, several studies have reported the effect of xylanase pretreatment on chemical pulping (Varghese et al 2020a(Varghese et al ,2020bAkgül et al 2021). Xylanase pretreatment facilitates the separation of fibrils in the initial stage of fibrillation via the removal of easily accessible xylan, which is mainly located among micrometer-sized cellulose fibrils (Zhou et al 2019;Akgül et al 2021;Kumar 2021).…”

Section: Introductionmentioning

confidence: 99%

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Xylanase pretreatment of mechanically destructured chips of Eucalyptus tereticornis and its effect on kraft pulping

Pandey

Kumar

Singh

et al. 2021

BioRes

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Mechanical pulping of raw wood material is a highly energy intensive and pollution generating step in the papermaking process. This study focused on combined mechanical and xylanase treatment prior to the kraft pulping of E. tereticornis. A screened pulp yield of 49.1% (on oven-dry wood basis) with a Kappa number of 24.9 was obtained at the optimum cooking temperature of 160 °C without any pretreatment of the wood chips. After mechanical treatment (destructuring), a slightly higher screened pulp yield (49.4%) was obtained with a Kappa number of 24.2 at the cooking temperature of 145 °C with the same active alkali charge (15%). The optimum cooking temperature was further reduced to 140 °C for the destructured xylanase-treated wood chips. The xylanase treatment resulted in a 2% reduction in screened pulp yield due to hydrolysis of xylan. However, the Kappa number was reduced to 18.2 after xylanase pretreatment of the mechanically destructured wood chips. The combined pretreatment (destructured and xylanase treatment) of wood chips resulted in a reduction in cooking temperature by 20°C compared to untreated wood chips. Such a reduction in cooking temperature can effectively reduce steam consumption. The combined pretreatment improved the pulp brightness by 2.0 (ISO points) and physical strength properties, which included the tensile index, tear index, and burst index by 11.06%, 21.72%, and 21.79%, respectively, compared to the control.

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Section: Xylanase Treatmentmentioning

confidence: 87%

Section: Xylanase Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Xylanase pretreatment of mechanically destructured chips of Eucalyptus tereticornis and its effect on kraft pulping

Pandey

Kumar

Singh

et al. 2021

BioRes

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show abstract

“…In another study, wheat straw was pretreated with xylano-pectinolytic concoction with xylanase dose of 400 IU/g oven-dry wheat straw and pectinase dose of 120 IU/g oven-dry wheat straw at temperature 55 °C for 3 h. The enzymatic pretreatment reduced the kappa number by 16.47% while the pulp brightness was improved by 17.20%. Moreover, the pulping chemical requirement was also minimized by 12% as compared to control (without enzyme treatment) (Varghese et al 2020a).…”

Section: Pulping Of Xylanase Pretreated De-structured Wood Chips Of L Leucocephalamentioning

confidence: 99%

Influence of mechanical operation on the biodelignification of Leucaena leucocephala by xylanase treatment

et al. 2021

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This study aimed at energy reduction during pulping of L. leucocephala by passing the wood chips through an impressafiner followed by xylanase pretreatment. An impressafiner compressed the chips and converted them into spongy materials. Wood chips of L. leucocephala with or without de-structuring and de-structured wood chips followed by enzymatic treatment were subjected to Kraft pulping at different temperatures varying from 135 to 170 °C and active alkali varying from 12 to 20% (as Na 2 O) to observe effect on screened pulp yield and kappa number. The de-structured wood chips followed by enzymatic treatment produced a pulp yield of 48.2% and kappa number 18.6. L. leucocephala without de-structuring produced a pulp yield of 50.1% and kappa number 23.7. When the pulp was subjected to oxygen delignification to reduce kappa number in the vicinity of 18.6, pulp showed shrinkage by 6.64% compared to Kraft pulp of de-structured wood chips followed by enzymatic treatment. Kraft pulp produced from de-structured wood chips of L. leucocephala followed by enzymatic treatment showed net saving of US$ 163.15 per digester over Kraft pulp produced without de-structuring of wood chips of L. leucocephala. Moreover, the pulp obtained by de-structuring followed by enzymatic treatment showed improvement in pulp brightness and physical strength properties including tensile, tear, and burst index significantly compared to pulp obtained without de-structuring.

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“…The wheat straw is a plentiful agricultural residue in northern China; however, the majority of it is incinerated and subsequently returned to the elds [9]. The application of wheat straw as pulping material not only reduces environmental pollution but also alleviates the scarcity of the raw materials in the pulp and paper industry [10]. However, the traditional chemical pulping method for wheat straw results in a low pulping yield, a high-level content of silica in the waste liquor, and challenging in chemical recovery [11,12].…”

Section: Introductionmentioning

confidence: 99%

Combined alkali impregnation and poly dimethyl diallyl ammonium chloride-assisted cellulase absorption for high-efficiency pretreatment of wheat straw

Huang,

Tian,

et al. 2023

Adv Compos Hybrid Mater

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Bio-enzyme pretreatment can effectively reduce the chemical resistance of wood bers, thereby resulting in a reduction in energy consumption during the pulping process. However, both cellulase and cellulose bers commonly exhibit negative charge used in water, leading to inherent electrostatic repulsion. The present study developed a novel combined pretreatment approach involving alkali impregnation and poly dimethyl diallyl ammonium chloride (PDADMAC)-assisted treatment to enhance the e ciency of cellulase treatment and obtain pulp with superior properties. The results showed that the alkali impregnation effectively destroyed the waxy layer on the surface of wheat straw, enhancing the interaction between subsequent cellulase and wheat straw bers. The presence of PDADMAC further facilitated cellulase adsorption onto the wheat straw surface. When the PDADMAC dosage was increased to 1.0×10 − 3 g/g wheat straw, the cellulase adsorption rate exhibited a signi cant increase of 42.28%. Additionally, at cellulase dosages of 10 U/g and 15 U/g, the pulp ltration capacity demonstrated improvements of 35.41% and 16.30%, respectively.

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Eco-friendly pulping of wheat straw using crude xylano-pectinolytic concoction for manufacturing good quality paper

Cited by 17 publications

References 12 publications

Xylanase pretreatment of mechanically destructured chips of Eucalyptus tereticornis and its effect on kraft pulping

Xylanase pretreatment of mechanically destructured chips of Eucalyptus tereticornis and its effect on kraft pulping

Influence of mechanical operation on the biodelignification of Leucaena leucocephala by xylanase treatment

Combined alkali impregnation and poly dimethyl diallyl ammonium chloride-assisted cellulase absorption for high-efficiency pretreatment of wheat straw

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