Bio-softening of Coir Yarn for Ecofriendly Wet Processing
Abstract
Conventional chemical bleaching of coir generates a considerable amount of effluent which is discharged into the local water bodies thereby affecting the water quality there. The possibility of bio-bleaching and bio-softening of coir yarn in order to reduce the requirement of softening and bleaching chemicals in wet processing of coir was studied. Treatment of coir yarn for 72 hrs using Trametes versicolor (NCIM 993) and Coirret, a bacterial consortium was carried out. The bio-treatment could impart an appreciable degree of softness to the yarn which was confirmed by the Flexural Rigidity Test. An improvement in softness of the yarn to the extent of 38% using bacterial treatment and 46% using fungal treatment was achieved. A noticeable change was observed in surface morphology of the fibre through SEM analysis. The lignin content of the fungal treated yarn was also reduced to some extent. An increase of 10% in Brightness Index of the fungi treated yarn was observed and a reduction in the requirement of bleaching chemicals could also be achieved. The physico-chemical parameters of the residual bleach liquor were also studied and a considerable decrease in BOD, COD and phenol content was observed.
References
Ana Maria Rebelo Barreto Xavier, Ana Paula Mora Tavares, Rita Ferreira, Francisco Amado. 2007. Trametes versicolor growth and laccase induction with by-products of pulp and paper industry. Electronic Journal of Biotechnology. 10(3):
Anto, I.R, Ravindran, T, Ravi, P.K, Kumaraswamy Pillai, M and Sharma, U.S. 1997a. Investigations in Bleaching of Coir. Proceedings on the International Workshop on Wet Processing of Coir, COIR’ 97. : 86-99
Anto, I.R, Ravi, P.K, Sharma, U.S. 1997b. Studies on imparting softness to coir fibre/yarn. Proceedings on the International Workshop on Wet Processing of Coir, COIR’ 97. :68-85
Arockiasamy S, Krishnan IP, Anandakrishnan N, Seenivasan S, Sambath A, Venkatasubramani JP. 2008. Enhanced production of laccase from Coriolus versicolor NCIM 996 by nutrient optimization using response surface methodology. Appl Biochem Biotechnol. 151(2): 371-379
Arora, Daljit Singh and Gill, Paramjit Kaur. 2001. Effects of various media and supplements on laccase production by some white rot fungi. Bioresource Technology. 77(1): 89-91
Das, A.R. 2001. Biotechnology in coir extraction and waste utilization. CORD. 17(2)
Gupta. P.K. 2001. Methods in Environmental Analysis: Water, Soil and Air. Agrobios (India), pp. 68-72
Hiroto Homma, Hirofumi Shinoyama, Yukihiro Nobuta,Yoshie Terashima, Seigo Amachi and Takaaki Fujii. 2007. Lignin-degrading activity of edible mushroom Strobilurus ohshimae that forms fruiting bodies on buried sugi (Cryptomeria japonica) twigs. Journal of Wood Science. 53(1): 80-84
Nurdan Kasikara Pazarlıoglu, Merih Sariisik and Azmi Telefoncu. 2005. Laccase: production by Trametes versicolor and application to denim washing. Process Biochemistry. 40(5): 1673-1678
Rajan A, Senan RC, Pavithran C, Abraham TE. 2005. Biosoftening of coir fibre using selected microorganisms. Bioprocess Biosyst. Eng. 28(3): 165-173
Stephen Y. Lin & Carlton W. Dence (Eds.). 1992. Methods in Lignin Chemistry, Springer –Verlag Berlin Heidelberg, pp. 34-40
Standard Methods for the examination of water and waste water. 1989. APHA-AWWA-WPCF, 17th Edition, American Public Health Association, pp.5.48-5.54.
Suganya, D.S, Pradeep, S, Jayapriya, J and Subramanian, S. 2007. Bio-softening of mature coconut husk for facile coir recovery Bio-softening of mature coconut husk for facile coir recovery. Indian Journal of Microbiology. 47(2)
Uma Sankar Sarma. 2001. Softening of coir’ Souvenir, published by Coir Board on the occasion of India International Coir Fair (IICF), pp. 103-109
