Main Article Content

Abstract

Lack of degradability and the closing of landfill sites as well as growing water and land pollution problems have led to concern about plastics. Among the various types of plastics, the most extensively used type is polyethylene bags. A survey on 40 micron polyethylene bags was done by obtaining the information from the City corporation office, Belgaum, Karnataka, India on the amount of plastic waste generated in the city. Polyethylene bags having a thickness less than 40 micron are not recycled, thus have to be degraded. In this work, Aspergillus niger is been employed to degrade the 40 micron plastic. Various pre-treatment methods are used which include UV, nitric acid, thermal and UV + nitric acid treatments to effectively degrade the plastic. Different media having pre treated plastic as the carbon source are tested for the degradation of plastic along with the growth of the fungi. Incubation period was taken as 15 and 30 days. Optimization of pre-treatment methods was done to improve the degradation efficiency. Various analysis methods such as FTIR spectroscopy and dry-weight analysis were done to confirm the degradation of plastic.

Keywords

40 micron polyethylene bags Aspergillus niger bio-degradation pre-treatment optimization nitric acid FTIR UV

Article Details

How to Cite
Kittur, S., Patil, N. ., Kammar, S. ., Priya, V. G. S. ., & Sastry, D. N. . (2013). Bio-degradation of 40 micron plastic bags by Aspergillus niger and optimization of pre-treatment methods . Environment Conservation Journal, 14(3), 61–68. https://doi.org/10.36953/ECJ.2013.14310

References

  1. Abadal. M., Cermak, R., Raab, M., Verney, V. 2006. Commereuc S, Fraisse F. Study on photo degradation of injection moulded (beta)-polypropylene. Polym Degrad Stab 91(3):459e63.
  2. Arkatkar, A., Arutchelvi, J., Bhaduri, S., Uppara, P. V., Doble, M. 2009. Int. Biodeterior.Biodegrad.63, 106– 111.
  3. Artham, T., Doble, M. 2008. Macromo l.Biosci., 8 (1), 14–2
  4. Goodings, E.P. 1961.Soc Chem Ind (London) Monogr 13:211;
  5. Hamid, S.H., Amin, M.B., Maadhah, A.G. 1995. Weathering degradation of polyethylene. In: Hamid SH, Amin MB, Maadhah AG, editors. Handbook of polymer degradation. New York: Marcel Dekker.
  6. Joel, F.R. 1995. Polymer Science & Technology: Introduction to polymer science,Eds. 3, Pub: Prentice Hall PTR Inc., Upper Saddle River, New Jersey 07458, p: 4–9.
  7. Jensen, J.P.T., Kops. J. 2003. Photochemical degradation of blends of polystyrene and poly (2, 6-dimethyl-1,4-phenylene oxide). J Polym Sci Polym Chem , 18 (8):2737e46.
  8. Mark, H.F., Bikales, N.M., Overberger, C.G., Menges, G. 1986. Encyclopedia of polymer science and engineering.2nd ed., vol. 4. New York: Wiley Interscience Publication; p. 630e96.
  9. Martin, J.W., Chin, J.W., Nguyen, T. 2003. Reciprocity law experiments in polymeric photodegradation: a critical review. Prog Organic Coatings , 47:292e311.
  10. Nagai, Y., Nakamura, D., Miyake, T., Ueno, H., Matsumoto, N., Kaji, A. 2005. Photodegradation mechanisms in poly (2,6-butylenenaphthalate-cotetra methylene glycol) (PBNePTMG). I: Influence of the PTMG content. Polym Degrad Stab, 88(2):251e5.
  11. Ranby, B. 1989. Photodegradation and photo-oxidation of synthetic polymers. J Anal Appl Pyrolysis ,15:237e47.
  12. Ramis, X., Cadenato, A., Salla, J.M., Morancho, J.M., Valles, A., Contat, L., 2004. Thermal degradation of polypropylene/starch-based materials with enhanced biodegradability. PolymDegrad Stab, 86:483e91.
  13. Scott, G. 1990. Photo-biodegradable plastics: their role in the protection of the environment. Polym Degrad Stab ,29:135–54.
  14. Tayler, D.R. 2004. Mechanistic aspects of the effect of stress on the rate of photochemical degradation reactions in polymers. J Macro mol Sci Part C Polym Rev ,44(4):351e88.
  15. Teare, D.O.H., Emmison, N., Tonthat, C., Bradley, R.H. 2000. Cellular attachment to UVozone modified polystyrene surfaces. Langmuir , 16(6):2818e24.
  16. Zuev, V.V., Bertini, F., Audisio, G. 2006. Investigation on the thermal degradation of acrylic polymers with fluorinated side-chains. Polym Degrad Stab , 91 (3): 512 e6.