Xylanase and laccase based enzymatic kraft pulp bleaching reduces adsorbable organic halogen (AOX) in bleach effluents: A pilot scale study

Sharma, Abha; Thakur, Vasanta Vadde; Shrivastava, Anita; Jain, Rakesh; Mathur, R. M.; Gupta, Rishi; Kuhad, Ramesh Chander

doi:10.1016/j.biortech.2014.06.066

Cited by 103 publications

(65 citation statements)

References 30 publications

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“…Valenzuela et al (2014) reported that 23% delignification can be obtained when using xylanase on soda-AQ sisal pulp. Sharma et al (2014) reported that the sequential treatment of xylanase and laccase improved pulp properties and reduced absorbable organic halogens (AOXs) in bleach plant effluent.…”

Section: Introductionmentioning

confidence: 99%

Boosting Oxygen Delignification of Poplar Kraft Pulp by Xylanase Pretreatment

Chen

Wang

et al. 2015

BioResources

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Enhancement of oxygen delignification is critical to improve subsequent bleaching efficiency while being environmentally compatible. In the present study, xylanase was used to improve the delignification process of poplar kraft pulp. Results showed that the kappa number reduction ratio (KRR) of 14.5% was achieved for the pulp under xylanase-assisted oxygen delignification processes when compared to the control without xylanase treatment. Other pulp properties, such as intrinsic viscosity and brightness, also improved somewhat; i.e., viscosity increased by 28 mL/g units and ISO brightness increased 1.4% points. Furthermore, 31 P-NMR was employed to characterize the chemical structure of the residual lignin of the pulps before and after oxygen delignification. It showed that the condensed phenolic and syringyl hydroxyl groups decreased significantly for the xylanase-assisted oxygen-delignified pulps.

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Section: Introductionmentioning

confidence: 99%

Boosting Oxygen Delignification of Poplar Kraft Pulp by Xylanase Pretreatment

Chen

Wang

et al. 2015

BioResources

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“…Xylanase can also be used to process pulp (102). The sequential treatment of pulp with xylanase and laccase resulted in a 50% reduction in postcolor number, a 15.71% increase in the tear index, and lower levels of absorbable organic halogens (34%) in the bleach effluents (103). Laccase could also be used to treat textile mill effluents, remove phenolic compounds from beverages, remove sulfur from fossil fuels, and develop biosensors (104).…”

Section: Paper Manufacturingmentioning

confidence: 99%

Plant Molecular Farming: Much More than Medicines

Tschofen

Knopp

Hood

et al. 2016

Annual Rev. Anal. Chem.

147

103

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Plants have emerged as commercially relevant production systems for pharmaceutical and nonpharmaceutical products. Currently, the commercially available nonpharmaceutical products outnumber the medical products of plant molecular farming, reflecting the shorter development times and lower regulatory burden of the former. Nonpharmaceutical products benefit more from the low costs and greater scalability of plant production systems without incurring the high costs associated with downstream processing and purification of pharmaceuticals. In this review, we explore the areas where plant-based manufacturing can make the greatest impact, focusing on commercialized products such as antibodies, enzymes, and growth factors that are used as research-grade or diagnostic reagents, cosmetic ingredients, and biosensors or biocatalysts. An outlook is provided on high-volume, lowmargin proteins such as industrial enzymes that can be applied as crude extracts or unprocessed plant tissues in the feed, biofuel, and papermaking industries.

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“…Referring to the successful experience of controlling AOx in developed countries, coupling with the development of China's low pollution bleaching technology and domestic papermaking enterprises bearing capacity, the time of forcing to control AOx emissions has come [11,12]. From the latest research results of chlorine bleaching, controlling the pollution of AOx is one of the important measures for implementation of environmental protection [13,14].…”

Section: Introductionmentioning

confidence: 99%

Absorbable Organic Halide Reduction Research in Elemental Chlorine-Free Bleaching of Eucalyptus Kraft Pulp

Yao¹,

Gao²,

Zhu³

et al. 2017

JRST

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ABSTRACT:The parameters of elemental chlorine-free (eCf) bleaching (D 0 E p D 1 ) of eucalyptus kraft pulp were optimized to reduce aox formation. The optimal conditions were pulp concentration 10%, Clo 2 dosage 2.8%, ph 3.5, temperature 60°C, time 60 min at D 0 ; h 2 o 2 dosage 1.25%, alkali dosage 2.0%, temperature 65°C, time 105 min at E p ; Clo 2 dosage 0.2%, ph 4.5, temperature 60°C, time 55 min at D 1 . aox formation was 0.553 kg.tp -1 , each stage was 0.470 kg.tp -1 , 0.060 kg.tp -1 and 0.023 kg.tp -1 , respectively. Compared with un-optimized aox formation decreased by 23.7%.The brightness and viscosity was 84.36% iSo, 834.6 mL.g -1 . in fact, good quality of the pulp was obtained when aox formation has fallen dramatically. These provide a theoretical basis for reducing the produce of aox and realizing the clean bleaching.

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Xylanase and laccase based enzymatic kraft pulp bleaching reduces adsorbable organic halogen (AOX) in bleach effluents: A pilot scale study

Cited by 103 publications

References 30 publications

Boosting Oxygen Delignification of Poplar Kraft Pulp by Xylanase Pretreatment

Boosting Oxygen Delignification of Poplar Kraft Pulp by Xylanase Pretreatment

Plant Molecular Farming: Much More than Medicines

Absorbable Organic Halide Reduction Research in Elemental Chlorine-Free Bleaching of Eucalyptus Kraft Pulp

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