» Utilization of Enzymes during Pulp &
Paper making for reduction in use of Cooking & Bleaching Chemicals,
Energy during Pulping, Refining and Management of Wood & Industrial
Waste Minimization.
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Objective
The
main objective of the project is application of enzymes /fungal treatment in
the area of pulping of raw materials to reduce refining energy and chemical
requirement during pulping & bleaching resulting in decreased pollution
loads and simultaneous reduction in toxicity of the bleach effluents &
other pollutional parameters.
Activities
- Enzymatic Prebleaching of pulps (Bio-Bleaching)
Laboratory
& mill site studies on enzymatic prebleaching with various xylanase
enzymes on both wood and non wood pulps with bleach sequences like CEH,
CEHH,CE(P)HED, CE(P)HH, showed encouraging results in respect of savings in
chlorine, AOX reduction and gain in brightness. Results are encouraging in
terms of brightness gain of 2-3%, savings in chlorine by 15% and reduction
in AOX load by 18-20% in the bleach effluents without compromising the pulp
quality.
Based on the data generated on enzyme prebleaching studies
and the mill scale experience, a demonstration bio-bleaching project has
been awarded to CPPRI for transfer of the enzyme bleaching technology to the
Indian Pulp & Paper Industry.
- Fungal degradation of
raw materials (Bio-Pulping)
Two unidentified ligninolytic
strains were isolated using selective media for the Basidiomycetes. On the
basis of cultural characteristics and biochemical/enzyme characters, the
fungi were categorised as white rot fungi, (Ligninolytic fungi group) and
were assigned the name as CPPRI-I (S2) & CPPRI-2 (S4).
Among
the identified strains, CPPRI isolated fungal strains show better
delignification efficiency, i.e. lignin loss varying from 4 to 6% in
eucalyptus and up to 6% in bagasse without loosing much of a cellulose.
Draft
report has been submitted to Indian Paper Manufacturer's Association.
Research
& Development
