A pollution reducing enzymatic deinking approach for recycling of mixed office waste paper

Singh, Avtar; Varghese, Libin Mathew; Yadav, Ravi Dutt; Mahajan, Ritu

doi:10.1007/s11356-020-10440-9

Cited by 19 publications

(5 citation statements)

References 38 publications

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“…This table shows that the deinking e ciency of the hybrid LED-UV, the LED-UV, and the vegetable oil-based inks were 58.1%, 46.9%, and 42.1%, respectively. The highest deinking e ciency of 58.1% was acquired with the hybrid LED-UV ink, which were much higher than those reported in recent work (Singh et al 2020). Based on Table 1, the whiteness and brightness of the hybrid LED-UV deinked pulp reached the maximum values of 77.2% and 85.5%, respectively.…”

Section: The Deinking E Ciency Of Hybrid Led-uv Led-uv and Vegetable ...contrasting

confidence: 62%

Effects of Flotation Deinking on Environmentally Friendly Offset Paper Printing Ink

Yang

Jian-bin

et al. 2022

Preprint

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Waste paper has become a promising raw material for the pulp and paper industry due to its low cost and because it is conducive to sustainable development. Unfortunately, waste paper contains a high volume of printed paper that is difficult to deink, which restricts its applications. Flotation deinking plays an essential role in the product quality and process cost of wastepaper recycling. This study was performed to evaluate the deinkability of environmentally friendly offset inks by flotation deinking. For this purpose, three series of four-color inks, namely, hybrid light emitting diode ultraviolet (LED‒UV), LED‒UV, and vegetable oil‒based inks, were printed on white lightweight coated papers under laboratory conditions. The deinking methodology involves repulping, deinking agent treatment, flotation, hand sheet making, and evaluation of the produced hand sheets. The obtained results indicated that the hybrid LED‒UV prints had the best deinkability. After flotation deinking, the deinking efficiency and the whiteness of the hybrid LED‒UV ink increased by 58.1% and 47.6%, respectively. LED‒UV ink had a 46.9% increase in the deinking efficiency and a 37.0% increase in the whiteness of the hand sheet. The deinking efficiency of the vegetable oil‒based ink was the lowest, at 42.1%, and the whiteness of the hand sheet increased only by 23.8%. The particle size distribution analysis demonstrated that the hybrid LED‒UV four-color ink exhibited a larger value of the average particle size than the two other. Scanning electron microscopy revealed that the hybrid LED‒UV ink particles on the surface of the fibers were the least abundant after deinking. The physical strength properties of the hand sheets, including tensile index, folding resistance, and cohesion of the hybrid LED‒UV, LED‒UV inks, and vegetable oil‒based inks, increased.

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Section: The Deinking E Ciency Of Hybrid Led-uv Led-uv and Vegetable ...contrasting

confidence: 62%

Effects of Flotation Deinking on Environmentally Friendly Offset Paper Printing Ink

Yang

Jian-bin

et al. 2022

Preprint

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“…This crucial step in pectin degradation, involving cutting the pectin skeleton and progressively breaking down the substance, makes pectin lyase vital for industrial environmental protection (Tasgin et al 2020). Pectinase pretreatment nds diverse applications, reducing fruit juice viscosity in food processing (Rahman et al 2020), enhancing cotton fabric absorbency in the textile industry (Aggarwal et al 2020), and improving paper quality while decreasing chemical usage in the paper industry (Ahlawat et al 2007; Nawawi et al 2021;Singh et al 2020). Notably, treating mechanical pulp with pectinase degrades pectin on bers, reducing the amount of extractives covering the ber surface.…”

Section: Introductionmentioning

confidence: 99%

Heterologous and efficient expression of a new alkaline pectin lyase in Pichia pastoris

Li,

Han

2024

Preprint

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Pectin lyase (PMGL) is an industrially important enzyme with widespread applications in the food, paper, and textile industries, owing to its capacity for direct degradation of highly esterified pectin. In this study, PMGL-Ba derived from Bacillus underwent mining and heterologous expression in P. pastoris. Furthermore, diverse strategies, encompassing the optimization of expression cassette components, elevation of gene dosage, and co-expression of chaperone factors, were employed to augment PMGL-Ba production in P. pastoris. The signaling peptide OST1-pre-α-MF-pro and promoter AOX1 were finally selected as expression elements. By overexpressing the transcription factor Hac1p in conjunction with a two-copy PMGL-Ba setup, a strain yielding high PMGL-Ba production was achieved. In shake flask fermentation lasting 144 hours, the total protein concentration reached 1.81 g/L, and the enzyme activity reached 1821.36 U/mL. For further scale up production, high-density fermentation transpired in a 5 L fermenter for 72 h. Remarkably, the total protein concentration increased to 12.49 g/L, and the enzyme activity reached an impressive 12668.12 U/mL. The successful heterologous and efficient expression of PMGL-Ba not only furnishes a valuable biological enzyme for industrial applications but also contributes to cost reduction in the utilization of biological enzymes in industrial applications.

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“…Pectinase pretreatment finds diverse applications, reducing fruit juice viscosity in food processing (Rahman et al 2020 ), enhancing cotton fabric absorbency in the textile industry (Aggarwal et al 2020 ), and improving paper quality while decreasing chemical usage in the paper industry (Ahlawat et al 2007 ; Nawawi et al 2021 ; Singh et al 2020 ). Notably, treating mechanical pulp with pectinase degrades pectin on fibers, reducing the amount of extractives covering the fiber surface.…”

Section: Introductionmentioning

confidence: 99%

Efficient expression of an alkaline pectin lyase from Bacillus licheniformis in Pichia pastoris

Li,

Yang,

Zhao

et al. 2024

Bioresour. Bioprocess.

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Pectin lyase (PMGL) is an industrially important enzyme with widespread applications in the food, paper, and textile industries, owing to its capacity for direct degradation of highly esterified pectin. In this study, PMGL-Ba derived from Bacillus licheniformis underwent mining and heterologous expression in P. pastoris. Furthermore, diverse strategies, encompassing the optimization of expression cassette components, elevation of gene dosage, and co-expression of chaperone factors, were employed to augment PMGL-Ba production in P. pastoris. The signaling peptide OST1-pre-α-MF-pro and promoter AOX1 were finally selected as expression elements. By overexpressing the transcription factor Hac1p in conjunction with a two-copy PMGL-Ba setup, a strain yielding high PMGL-Ba production was achieved. In shake flask fermentation lasting 144 h, the total protein concentration reached 1.81 g/L, and the enzyme activity reached 1821.36 U/mL. For further scale up production, high-density fermentation transpired in a 5 L fermenter for 72 h. Remarkably, the total protein concentration increased to 12.49 g/L, and the enzyme activity reached an impressive 12668.12 U/mL. The successful heterologous and efficient expression of PMGL-Ba not only furnishes a valuable biological enzyme for industrial applications but also contributes to cost reduction in the utilization of biological enzymes in industrial applications.

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A pollution reducing enzymatic deinking approach for recycling of mixed office waste paper

Cited by 19 publications

References 38 publications

Effects of Flotation Deinking on Environmentally Friendly Offset Paper Printing Ink

Effects of Flotation Deinking on Environmentally Friendly Offset Paper Printing Ink

Heterologous and efficient expression of a new alkaline pectin lyase in Pichia pastoris

Efficient expression of an alkaline pectin lyase from Bacillus licheniformis in Pichia pastoris

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