Amenability of Acacia and Eucalyptus Hardwood Pulps to Elemental Chlorine-Free Bleaching: Application and Efficacy of Microbial Xylanase

Gangwar, Avdhesh Kumar; Prakash, N. Tejo; Prakash, Ranjana

doi:10.15376/biores.10.4.8405-8413

Cited by 6 publications

(8 citation statements)

References 15 publications

(18 reference statements)

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“…Xilanase (EC 3.2.1.8) merupakan enzim hidrolitik yang digunakan untuk menghilangkan kompleks lignin karbohidrat (LCC) yang dihasilkan pada proses kraft dan berperan sebagai penghalang fisik pada proses pemutihan kimiawi. Karakteristik xilanase yang diperlukan pada proses biobleaching adalah bersifat stabil dan aktif pada suhu tinggi dan alkali (pH 9 -12), bebas aktivitas (Singh, Pandey and Agrawal, 2013;Gangwar, Prakash and Prakash, 2015), dan memiliki spesifisitas yang tinggi (Bajpai, 1999). Genus Bacillus diketahui dapat memproduksi xilanase bebas selulase dalam jumlah besar dengan karakteristik tersebut (Saurabh Sudha Dhiman, Jitender Sharma, 2008;Nagar et al, 2013).…”

Section: Proses Delignifikasi Pulpunclassified

“…Xilanase dapat meningkatkan kecerahan pulp dengan mekanisme sebagai berikut: a. Xilan yang mengendap pada permukaan lignin akan dihidrolisis oleh xilanase, sehingga meningkatkan aksesibilitas bahan kimia pemutihan ke dalam serat (Shatalov and Pereira, 2009;Aracri and Vidal, 2011;Cheng et al, 2013;Sharma et al, 2014). b. Xilanase menghidrolisis LCC yang tersisa pada pulp, membuka struktur serat selulosa sehingga xilan akan terfragmentasi yang diikuti dengan ekstraksi fragmenfragmen yang terbentuk sehingga lignin coklat dan LCC yang tersisa pada pulp tersebut lebih mudah diekstraksi pada tahapan pemutihan (Shatalov and Pereira, 2009;Gangwar, Prakash and Prakash, 2015;Fillat et al, 2017).…”

Section: Proses Delignifikasi Pulpunclassified

“…Peningkatan kecerahan pulp ini diperoleh setelah pulp diputihkan dengan urutan CDE 1 D 1 D 2 (C: klorin; D: klorin dioksida; E:ekstraksi alkali (NaOH)). Hasil serupa diperoleh oleh penelitian Gangwar et al (2015), Optimase CX 72L dapat meningkatkan kecerahan pulp sebesar 0,9 -2,1 U untuk pulp Acacia mangium dan sebesar 0,8 -1,7 U untuk Eucalyptus globules (Gangwar, Prakash and Prakash, 2015). Kecerahan pulp yang berasal dari jerami gandum menunjukkan peningkatan sebesar 3,93% ketika ditambahkan xilanase dari Thermomyces lanuginosus CBS 288.54 (Nair, Shibdu and Shashidhar, 2010).…”

Section: Proses Delignifikasi Pulpunclassified

“…Xilanase saat ini banyak digunakan untuk proses pre-bleaching, namun beberapa penelitian menunjukkan bahwa xilanase juga dapat digunakan untuk menurunkan kandungan HexA pada pulp, sebagai efek sekunder (Shatalov and Pereira, 2009;Aracri and Vidal, 2011;Cadena et al, 2011;Thakur, Jain and Mathur, 2012;Valenzuela et al, 2014;Gangwar, Prakash and Prakash, 2015). HexA dapat dihilangkan dari pulp dengan menggunakan xilanase dengan cara menghidrolisis xilan yang berikatan dengan HexA (Gangwar, Prakash and Prakash, 2015) sehingga memfasilitasi pelepasan lignin dari pulp (Henriksson and Teeri, 2009). Beberapa xilanase dari famili yang berbeda (GH (Glycoside Hydrolase) 5, 10, 11 dan 30) telah diteliti lebih lanjut untuk menghilangkan HexA (Gallardo et al, 2010a;Valenzuela et al, 2014).…”

Section: Aplikasi Xilanase Untuk Penghilangan Hexaunclassified

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Aplikasi Enzim Di Industri Pulp Dan Kertas: I. Bidang Pulp (Enzyme Application in Pulp and Paper Industry: I. Pulp Section)

Septiningrum

Pramuaji

2017

J selulosa

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This review introduce about biotechnological application of enzyme in pulp and paper industry. These enzymes can be applied as biological agents in biopulping, biobleaching including Hexenuronic acid (HexA) removal. Degrading enzyme from white rot fungi, xylanase, laccase, lipase and α-glucuronidase are the the most applicable enzyme in the process. Nowadays, enzyme application is still under laboratory scale, only a few is applied further until industrial scale. There are some limitations for further application related with technical aspects such as effectivity of the enzyme during its application comparing with chemical compounds, enzyme availability in the market, enzyme characteristic that appropriate with the process in pulp mill and economical aspect. In the other hand, these technologies also provide some advantages such as reduce energy consumption, reduce or substitute chemicals and more environmental friendly ABSTRAK Kajian ini berisi mengenai aplikasi bioteknologi terutama enzim di industri pulp dan kertas. Enzim ini dapat diaplikasikan pada proses pulping, biobleaching termasuk penghilangan Hexenuronic acid (HexA). Enzim dari jamur pelapuk putih, xilanase, lakase, lipase dan α-glucuronidase merupakan enzim yang penting untuk diaplikasikan pada proses-proses tersebut. Aplikasi enzim saat ini masih dalam skala laboratorium, hanya beberapa diterapkan lebih lanjut sampai skala industri. Beberapa keterbatasan untuk aplikasi lebih lanjut terkait dengan aspek teknis adalah efektivitas enzim yang lebih rendah jika dibandingkan dengan bahan kimia, keterbatasan produk enzim yang ada di pasar khususnya karakteristik enzim yang sesuai untuk industri pulp, dan keterbatasan dari aspek ekonomi. Namun di satu sisi, teknologi ini juga diketahui memiliki beberapa kelebihan seperti dapat mengurangi penggunaan energi, mengurangi atau substitusi bahan kimia, dan lebih ramah lingkungan

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Section: Proses Delignifikasi Pulpunclassified

Section: Aplikasi Xilanase Untuk Penghilangan Hexaunclassified

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Aplikasi Enzim Di Industri Pulp Dan Kertas: I. Bidang Pulp (Enzyme Application in Pulp and Paper Industry: I. Pulp Section)

Septiningrum

Pramuaji

2017

J selulosa

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“…In recent years, there has been increasing interest in the use of xylanases, particularly in the bleaching process of the pulp and paper industry (Sandrim et al 2005). Xylanase enhances the effects of bleaching agents rather than removing lignin directly (Gangwar et al 2015).…”

Section: Introductionmentioning

confidence: 99%

An Eco-Friendly Approach: Incorporating a Xylanase Stage at Various Places in ECF and Chlorine-based Bleaching of Eucalyptus Pulp

Gangwar

Prakash

2016

BioResources

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A potentially more environmentally compatible approach was evaluated, involving the use of an enzyme (X) stage optimally inserted into various bleaching sequences for Eucalyptus kraft pulps. The efficacy of the X stage was evaluated in terms of final brightness, CIE whiteness, post-color number (brightness reversion), effluent characteristics, etc. The results showed considerable benefits with an enzymatic pre-treatment bleaching sequence for improved final pulp brightness (1.6 units higher) and reduced adsorbable organic halogens (AOX) (32% lower), in addition to improved biological oxygen demand (BOD) to chemical oxygen demand (COD) ratio, when using 0.5 kg/t pulp dosage of xylanase; enzymatic posttreatment bleaching sequences were observed to boost final CIE whiteness up to 3.4 units and to reduce post color number by 48% at 0.5 kg/t pulp dosage of xylanase. In addition, approximately 32% reductions in AOX released, as well as appreciable improvement in BOD-to-COD ratio, were observed in the bleach effluents. An improved ratio of BOD-to-COD facilitates possible enhancement in the bio-degradability of discharge effluents in a secondary treatment stage. Nine different bleaching sequences were compared. Three sequences for each category (pre-treatment, intermediate, and post-treatment bleaching sequences) were performed to provide an overview of the influence of xylanase treatment on various pulp properties and environmental sum parameters of the ensuing effluents.

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Xylanase treatment of eucalypt kraft pulps: effect of carryover

Matos,

Evtuguin,

de Sousa

et al. 2024

Appl Microbiol Biotechnol

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The influence of pulp carryover on the efficiency of the xylanase (X) treatment of industrial unbleached and oxygen-delignified eucalypt kraft pulps (A1 and A2 pulps, with kappa number (KN) values of 16 and 10, respectively), collected at the same pulp mill, was studied regarding the consumption of bleaching chemicals and pulp bleachability. Another non-oxygen-delignified eucalyptus kraft pulp of KN 13 was received after the extended cooking from a different pulp mill (pulp B). The assays were performed with both lab-washed (carryover-free) and unwashed (carryover-rich) pulps. Both lab-washed and unwashed pulps with carryover were subjected to X treatment, the former being demonstrating considerably higher ClO2 savings than the pulps containing carryover. The savings of bleaching reagents were higher when the X stage was applied to the A1 pulp than to the A2 pulp. This advantage of A1 pulp, however, was not confirmed when using unwashed pulps. In contrast, the gains obtained from the X treatment of unwashed pulp A2 were practically as high as those observed for the lab-washed A2 pulp. Furthermore, a similar effect in X stage was recorded for unwashed pulps having close KN: oxygen-delignified A2 pulp and non-oxygen-delignified B pulp. The results suggest that pulp carryover and initial pH were the key factors relating to the effectiveness of X treatment. The application of X treatment to the A2 unwashed pulp (after the oxygen stage) not only saved 20% of the ClO2 and 10% of the sodium hydroxide, but also improved the brightness stability of the bleached pulp without affecting its papermaking properties. Key points • Xylanase treatment boosts kraft pulp bleaching • Pulp carryover hinders the xylanase treatment • Nearly 20% of ClO2 and 10% NaOH savings can be reached using xylanase

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Amenability of Acacia and Eucalyptus Hardwood Pulps to Elemental Chlorine-Free Bleaching: Application and Efficacy of Microbial Xylanase

Cited by 6 publications

References 15 publications

Aplikasi Enzim Di Industri Pulp Dan Kertas: I. Bidang Pulp (Enzyme Application in Pulp and Paper Industry: I. Pulp Section)

Aplikasi Enzim Di Industri Pulp Dan Kertas: I. Bidang Pulp (Enzyme Application in Pulp and Paper Industry: I. Pulp Section)

An Eco-Friendly Approach: Incorporating a Xylanase Stage at Various Places in ECF and Chlorine-based Bleaching of Eucalyptus Pulp

Xylanase treatment of eucalypt kraft pulps: effect of carryover

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