Enzymatic deinking of laser printed office waste papers: Some governing parameters on deinking efficiency

Lee, Chee Keong; Demirtaş, İbrahim; Ibrahim, C. O.

doi:10.1016/j.biortech.2006.05.052

Cited by 68 publications

(33 citation statements)

References 10 publications

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“…Conventional chemical deinking uses large quantities of chemicals, which require costly water treatment systems (Borchardt et al, 1997;Lee et al, 2007). In order to overcome these disadvantages, enzymatic deinking has attracted a great deal of attention due to its high efficiency and low environmental impact (Thomas, 1994;Pala et al, 2006;Bajpai and Bajpai, 1998).…”

Section: Introductionmentioning

confidence: 98%

Performance and efficiency of old newspaper deinking by combining cellulase/hemicellulase with laccase-violuric acid system

Gao

et al. 2009

Waste Management

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Section: Introductionmentioning

confidence: 98%

Performance and efficiency of old newspaper deinking by combining cellulase/hemicellulase with laccase-violuric acid system

Gao

et al. 2009

Waste Management

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“…Other authors consider that endoxylanases provide the main activity (Berlin 9 et al 1997), promoting ink detachment due to hemicellulose hydrolysis on the fibers surface. 10 In any case, the combined action of the two activities has shown better deinking efficiencies 11 (Gübitz et al 1998; Lee et al 2007). In this sense, Viscozyme Wheat (containing 17 U/mg 12 endoglucanase activity estimated from glucose release from carboxymethylcellulose and 65 13 U/mg endoxylanase activity estimated from xylose release from birch xylan, Table 1) and 14 Ultraflo L (containing 23 U/mg endoglucanase activity estimated from glucose release from 15 carboxymethylcellulose and 61 U/mg endoxylanase activity estimated from xylose release 16 from birch xylan, Table 1) showed mainly both endoglucanase and endoxylanase activities, 17 explaining their effectiveness deinking secondary fibers from newspapers and magazines.…”

mentioning

confidence: 99%

Enzymatic deinking of secondary fibers: cellulases/hemicellulases versus laccase-mediator system

Ibarra

Monte

Blanco

et al. 2012

Journal of Industrial Microbiology and Biotechnology

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1The use of enzymes has been suggested as an environmentally-friendly alternative to 2 complement conventional chemical deinking in the recycling of recovered paper. This study 3 compares the use of carbohydrate hydrolases versus laccase-mediator system for deinking 4 printed fibers from newspapers and magazines. For this purpose, two commercial enzyme 5 preparations with endoglucanase and endoxylanase activities (Viscozyme Wheat from 6Aspergillus oryzae and Ultraflo L from Humicola insolens) and a commercial laccase 7 (NS51002 from Trametes villosa), the latter in the presence of synthetic or natural (lignin-8 related) mediators, were evaluated. The enzymatic treatments were studied at laboratory scale, 9 using a standard chemical deinking sequence consisting of pulping, alkaline deinking and 10 peroxide bleaching stages. Then, handsheets were prepared and their brightness, residual ink 11 concentration, and strength properties were measured. Among the different enzymatic 12 treatments assayed, both carbohydrate hydrolases were found to deink the secondary fibers 13 more efficiently. Brightness increased up to 3-4% ISO on newspaper fibers, being Ultraflo 14 20% more efficient in the ink removal. Up to 2.5% ISO brightness increase was obtained 15 when magazine fibers were used, being Viscozyme 9% more efficient in the ink removal. As 16 regards laccase-mediator system, alone or combined with carbohydrate hydrolases, it was 17 ineffective deinking both newspaper and magazine fibers, resulting in pulps with worse 18 brightness and residual ink concentration values. However, pulp deinking by laccase-mediator 19 system was displayed when secondary fibers rich in lignin, i.e. printed cardboard, were used, 20 obtaining up to 3% ISO brightness increase and lower residual ink concentrations. 21 22

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“…Selulase terbukti lebih efektif dibandingkan dengan xilanase pada biodeinking kertas fotokopi (Kumar and Satyanarayana, 2014). Pada biodeinking laser printed paper, selulase lebih baik dibandingkan esterase (Azmi and Him, 2016) dan lipase (Lee, Darah and Ibrahim, 2007). Meskipun demikian, penggunaan kombinasi selulase dan hemiselulase dapat meningkatkan efisiensi biodeinking (Dutt et al, 2012).…”

Section: Pendahuluanunclassified

Biodeinking Sorted White Ledger (Swl) Menggunakan Selulase (Biodeinking Sorted White Ledger (Swl) by Cellulase)

Purwita

Wirawan

2017

J selulosa

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Biodeinking is a process of separating ink on the fiber surface by enzymes. This research was conducted to study and optimize biodeinking condition of sorted white ledger (SWL) ABSTRAKBiodeinking merupakan proses pemisahan tinta pada permukaan serat menggunakan enzim. Penelitian ini dilakukan untuk mempelajari dan memperoleh kondisi optimum biodeinking sorted white ledger (SWL) menggunakan selulase. Selulase komersial (Sigma Aldrich, Singapura) dengan dosis 0,25; 0,5; 0,75; 1; 2 U/g kering pulp diaplikasikan pada deinking SWL dan dibandingkan terhadap blanko. Pulp deinked yang diperoleh kemudian dilakukan analisis morfologi serat dan dibuat lembaran tangan laboratorium untuk karakterisasi sifat fisik dan optik. Berdasarkan percobaan, pada dosis optimum selulase 0,75 IU/g kering pulp diperoleh kenaikan derajat cerah ISO maksimum sebesar 4,7 poin dan penurunan ERIC 34,45%. Analisis morfologi serat menunjukkan penggunaan selulase pada proses biodeinking tidak berpengaruh terhadap panjang dan diameter serat sehingga indeks tarik dan retak pulp deinked tidak berubah. Kehilangan fines karena degradasi enzimatik menyebabkan indeks sobek turun sebesar 8,70% dan porositas naik. Naiknya nilai coarseness menyebabkan meningkatnya opasitas pulp deinked.

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Enzymatic deinking of laser printed office waste papers: Some governing parameters on deinking efficiency

Cited by 68 publications

References 10 publications

Performance and efficiency of old newspaper deinking by combining cellulase/hemicellulase with laccase-violuric acid system

Performance and efficiency of old newspaper deinking by combining cellulase/hemicellulase with laccase-violuric acid system

Enzymatic deinking of secondary fibers: cellulases/hemicellulases versus laccase-mediator system

Biodeinking Sorted White Ledger (Swl) Menggunakan Selulase (Biodeinking Sorted White Ledger (Swl) by Cellulase)

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