Enzymatic Separation of High–Quality Uninked Pulp Fibers from Recycled Newspaper

Woodward, Jonathan; Stephan, Lynette M.; Koran, L.J.; Wong, Ken K. Y.; Saddler, John N.

doi:10.1038/nbt0994-905

Cited by 23 publications

(8 citation statements)

References 8 publications

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“…Indeed, photocopiers and laser printers physically bind the ink (thermosetting toners consisting of non-dispersible synthetic polymers) to the fibres as a result of high heat, making it difficult and expensive to remove by conventional chemical methods (Jeffries et al, 1993(Jeffries et al, , 1994. Most of the conventional deinking techniques require large amounts of chemical agents, such as sodium hydroxide, sodium carbonate, diethylenetriaminepentacetic acid, sodium silicate, hydrogen peroxide and surfactants (Prasad et al, 1993;Woodward et al, 1994), resulting in a costly wastewater treatment to meet the environmental regulations (Prasad et al, 1992). Alternatively, enzyme usage has been reported to be a potentially efficient and less polluting solution to overcome this disposal problem (Prasad et al, 1992;Putz et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Characterisation and application of glycanases secreted by Aspergillus terreus CCMI 498 and Trichoderma viride CCMI 84 for enzymatic deinking of mixed office wastepaper

Marques

Pala

Alves

et al. 2003

Journal of Biotechnology

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Two enzymatic extracts obtained from xylan-grown Aspergillus terreus CCMI 498 and cellulose-grown Trichoderma viride CCMI 84 were characterised for different glycanase activities. Both strains produce extracellular endoxylanase and endoglucanase enzymes. The enzymes optimal activity was found in the temperature range of 45-60 degrees C. Endoglucanase systems show identical activity profiles towards temperature, regardless of the strain and inducing substrate. Conversely, the endoxylanases produced by both strains showed maximal activity at different pH values (from 4.5 to 5.5), being the more acidic xylanase produced by T. viride grown on cellulose. The endoglucanase activities have an optimum pH at 4.5-5.0. The endoxylanase and endoglucanase activities exhibited high stability at 50 degrees C and pH 5.0. Mannanase, beta-xylosidase, and amylase activities were also found, being the first two activities only present for T. viride extract. These two enzymatic extracts were used for mixed office wastepaper (MOW) deinking. When the enzymatic extract from T. viride was used, a further increase of 24% in ink removal was obtained by comparison with the control. Both enzymes contributed to the improvement of the paper strength properties and the obtained results clearly indicate that the effective use of enzymes for deinking can also contribute to the pulp and paper properties improvement.

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Section: Introductionmentioning

confidence: 99%

Characterisation and application of glycanases secreted by Aspergillus terreus CCMI 498 and Trichoderma viride CCMI 84 for enzymatic deinking of mixed office wastepaper

Marques

Pala

Alves

et al. 2003

Journal of Biotechnology

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“…Different mechanisms for ink removal by the enzymes have been proposed. 15,[38][39][40][41][42] The pectinase enzyme decomposes the polysaccharide matrix from the primary wall (where pectin is present), promoting the swelling of this wall, along with higher porosity and loss of compactness (increased bulk), allowing increased accessibility and higher dissolution capacity of the fibers. Ink particles are then dislodged as the fibers separate during washing.…”

Section: Results and Discussion Effects Of Pectinase Deinking On Physmentioning

confidence: 99%

EFFECTS OF pH VARIATION ON EFFICIENCY OF OLD NEWSPAPER DEINKING BY PECTINASE DERIVED FROM ASPERGILLUS NIGER

Akbari¹,

Marzbani²

2019

Cellulose Chem. Technol.

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Enzymes are protein molecules with complex structure that accelerate biochemical reactions. The activity of these chemical compounds is limited to a specific range of pH and temperature. The effect of pH variations on deinking efficiency of old newspaper (ONP) by pectinase was investigated in this study. Old newspaper was repulped in a laboratory disintegrator for 10 minutes at 5% consistency and 26500 rpm. Enzymatic treatment of recycled ONP was carried out for 20 minutes at 0.1% enzyme concentration and 10% consistency, and pH levels of 3.5, 4, 4.5, 5, 5.5 and 6. The results showed that more efficient pectinase deinking of old newspaper can be achieved at pH level of 4-4.5, as indicated by the improved optical and mechanical properties of standard handsheets obtained by enzymatic deinking at pH levels of 4 to 5.

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“…Most published literature on deinking deals with cellulases and hemicellulases. The mechanism of deinking by these enzymes has not been completely elucidated, although some hypotheses have been described (Eom & Ow, 1990;Kim, Ow, & Eom, 1991;Mohammed, 2010;Putz, Renne, Gottsching, & Jokinen, 1994;Woodward, Stephan, Koran, Wong, & Saddler, 1994;Zeyer, Joyce, Heitmann, & Rucker, 1994). Deinking involves dislodging ink particles from the fibre surfaces then separating the dispersed ink from the fibre suspension by washing or flotation.…”

Section: Enzymes Used In Deinking and Their Mechanismmentioning

confidence: 99%

Deinking with Enzymes

Bajpai¹

2014

Recycling and Deinking of Recovered Paper

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Enzymatic Separation of High–Quality Uninked Pulp Fibers from Recycled Newspaper

Cited by 23 publications

References 8 publications

Characterisation and application of glycanases secreted by Aspergillus terreus CCMI 498 and Trichoderma viride CCMI 84 for enzymatic deinking of mixed office wastepaper

Characterisation and application of glycanases secreted by Aspergillus terreus CCMI 498 and Trichoderma viride CCMI 84 for enzymatic deinking of mixed office wastepaper

EFFECTS OF pH VARIATION ON EFFICIENCY OF OLD NEWSPAPER DEINKING BY PECTINASE DERIVED FROM ASPERGILLUS NIGER

Deinking with Enzymes

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Enzymatic Separation of High–Quality Uninked Pulp Fibers from Recycled Newspaper

Cited by 23 publications

References 8 publications

Characterisation and application of glycanases secreted by Aspergillus terreus CCMI 498 and Trichoderma viride CCMI 84 for enzymatic deinking of mixed office wastepaper

Characterisation and application of glycanases secreted by Aspergillus terreus CCMI 498 and Trichoderma viride CCMI 84 for enzymatic deinking of mixed office wastepaper

EFFECTS OF pH VARIATION ON EFFICIENCY OF OLD NEWSPAPER DEINKING BY PECTINASE DERIVED FROM ASPERGILLUS NIGER

Deinking with Enzymes﻿

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Deinking with Enzymes