Bio-bleaching of Anthocephalus cadamba Kraft Pulp through Direct Fungal Treatment by FEQP Sequence.
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Date
2015
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Abstract
Aims: The study aims at mitigating pulp kappa number before bleaching to minimize pollution load.
Study Design: An experimental study.
Methodology: The various parameters of direct fungal (Coprinellus disseminatus MLK01) treatment
(F-stage) of unbleached kraft pulp of Anthocephalus cadamba were optimized and compared with
the results of enzymatically pre-bleaching. Finally, the pulp was bleached by EQP three-stage and
XECEHH six stages bleaching sequences.
Results: Direct fungal treatment (F-stage) delignified the Anthocephalus cadamba kraft pulp more
selectively with Coprinellus disseminatus MLK01 compared to xylanase prebleached pulp from the
same fungus and oxygen delignification. F-stage mitigated the unbleached pulp kappa number by
55.0% and improved brightness and viscosity by 17.3 and 7.63% respectively. Kappa number
reduction and brightness improvement were 22.1 and 6.3% more in F-stage compared to XE-stage.
The kappa number and pulp brightness of oxygen delignified were 0.9 and 5.2% less compared to
F-stage. The viscosity of oxygen delignified pulp reduced drastically due to alkaline peeling
reactions compared to XE-stage (‒26.86%) and F-stage (‒27.09%). The brightness and viscosity of
XECEHH bleached pulp were 80.1% and 7.4 cps at a chlorine demand of 4.3% while FEQP
bleached pulp produced brightness of 79.7% and viscosity 8.2 cps. COD and colour values in effluent generated during FEQP bleaching were 53.29% and 54.36% less compared to CEHH
bleaching.
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Keywords
Coprinellus disseminatus MLK01, Anthocephalus cadamba, kraft pulp, prebleaching, fungal treatment, oxygen delignification
Citation
Lal Mohan, Dutt Dharm, Kumar Amit, Gautam Archana. Bio-bleaching of Anthocephalus cadamba Kraft Pulp through Direct Fungal Treatment by FEQP Sequence. British Biotechnology Journal. 2015 8(4): 1-13.