Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/doi/10.4322/polimeros.2013.010
Polímeros: Ciência e Tecnologia
Divulgation Article

Degradação de Membrana Impermeabilizante de Polietileno de Alta Densidade Usada em Tanques de Armazenamento de Vinhaça

Degradation of Impermeable Membrane from High-Density Polyethylene Used in Vinasse Storage Tanks

Lavoie, Fernando Luiz; Bueno, Benedito S.; Lodi, Paulo C.

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Resumo

Membranas impermeabilizantes de polietileno de alta densidade (PEAD) são utilizadas como revestimento em tanques de armazenamento de vinhaça (resíduo da cana-de-açúcar), onde esse resíduo é lançado a temperaturas médias de 80-90 °C. Devido a essas temperaturas elevadas e à acidez do resíduo, essas membranas podem degradar, fissurar e perder a função para a qual foram projetadas vindo a contaminar o solo e o lençol freático. Este trabalho avaliou o efeito da vinhaça em membranas de PEAD após 4 meses de exposição em ambiente controlado. De forma complementar, utilizou-se também um líquido agressivo de pH básico (soda cáustica). Objetivou-se avaliar a resistência da membrana em contato com esses resíduos (ácido e básico). Foram avaliadas as propriedades físicas, mecânicas, teor de negro de fumo e análise termogravimétrica (TGA) para quantificar a degradação das membranas poliméricas frente aos resíduos químicos utilizados. Os resultados mostram, por exemplo, que enquanto a soda cáustica provocou pequena variação nas propriedades físicas, a vinhaça alterou a espessura do material em 7,8%. Analisando-se a imersão na vinhaça, verificou-se uma diminuição média na resistência e deformabilidade (escoamento) de 34% e 23,5%, respectivamente. Houve um aumento médio na rigidez de 7,8% e uma pequena diminuição na resistência média ao rasgo (2,7%).

Palavras-chave

Membrana de PEAD, propriedades físicas e mecânicas, negro de fumo, análise térmica (TGA).

Abstract

High-density polyethylene (HDPE) water-proof membranes are used as coatings in vinasse (leachate from sugar cane) storage tanks. The leachate is pumped into the tanks at temperatures of 80-90 °C. Due to these high temperatures and acidity of the waste, these membranes can be degraded, cracked and then loose the function for which they have been designed. This may cause contamination of the soil and groundwater. This study evaluated the effect of vinasse in HDPE membranes after 4 months of exposure in a controlled environment. An aggressive, alkaline pH liquid (sodium hydroxide) was also used. The objective was to evaluate the membrane resistance in contact with acidic and alkaline residues. Physical and mechanical tests, measurement of the carbon black content and thermo gravimetric analysis (TGA) were used to determine degradation of polymer membranes after chemical immersion. While sodium hydroxide resulted caused only minor changes in the physical properties, vinasse induced a thickness change of 7.8%. With immersion in vinasse, an average decrease in strength and deformability (yield) of 34% and 23.5% were measured, respectively. The stiffness increased by 7.8% (average) and the tear strength decreased by 2.7% (average).

Keywords

HDPE membranes, physical and mechanical properties, carbon black, thermal analysis (TGA)

References



1. Costa, C. M. L.; Lodi, P. C.; Costa, Y. D. J. & Bueno, B. S. – Polímeros, 18, p.158 (2008). http://dx.doi.org/10.1590/ S0104-14282008000200014

2. Lodi, P. C. - “Aspectos de degradação de geomembranas poliméricas de pietielno de alta densidade e de poli cloreto de vinila”, Tese de Doutorado, Escola de Engenharia de São Carlos, Brasil (2003).

3. Rowe R. K.; Rimal S. & Sangam H. - Geotext Geomembranes, 27, p.137 (2009). http://dx.doi. org/10.1016/j.geotexmem.2008.09.007

4. Koerner, R. M.; Halse, Y. H. & Arthur, E. L. - “Long Term Durability and Aging of Geomembranes”, Waste Containment Systems: Construction, Regulation, and Performance, Edited by Rudolph Bonaparte (1992).

5. Environmental Protection Agency – EPA - “Method 9090: Compatibility Tests for Wastes and Membrane liners in EPA SW-846”, Test Methods for Evaluating Solid Waste, U.S. Environmental Protection Agency, Washington (1990).

6. American Society for Testing and Materials - ASTM - “D5747: Standard Practice for Tests to Evaluate the Chemical Resistance of Geomembranes to Liquids”, ASTM, West Conshohocken (2008).

7. International Organization for Standization – ISO - “ISO/ TR 12960: Geotextiles and geotextile-related products -- Screening test method for determining the resistance to liquids”, ISO (1998).

8. British Standards - BS - “EN 14414: “Geosynthetics. Screening test method for determining chemical resistance for landfill applications”, BS (2004).

9. Lodi, P. C. & Bueno, B. S. - “Proceedings of the Seventh International Conference on Geosynthetics”, Nice, p.523- 526 (2003).

10. Companhia de Tecnologia e Saneamento Ambiental - CETESB – “Método L1.030: Membranas impermeáveis e resíduos – avaliação da compatibilidade”, Cetesb (1990).

11. Dudzik, B. E. & Tisinger, L. G. – “Geosynthetic Testing for Waste Containment Applications”, ASTM STP 1081, Robert M. Koerner (ed.), ASTM, Philadelphia (1990).

12. Artieres, O.; Gousse, F. & Prigent, E. - Proceed. Sardinia, 91, p.587 (1991).

13. Ozsu, E. & Acar, Y. B. - Geotext. Geomembranes, 11, p.291, (1992). http://dx.doi.org/10.1016/0266-1144(92)90005-U

14. Overmann, L. K.; Cowland, J. W.; Mattravers, N. K.; Shung, W. K.; Lee, B. S. & Wan, C. H. - Proceed. Sardina, 93, p.333 (1993).

15. Surmann, R.; Pierson, P. & Cottour, P. - Proceed. Sardina, 95, p.405 (1995).

16. Duquennoi, C.; Bernhard, C. & Gaumet, S. - Proceed. Sardina, 95, p.397 (1995).

17. Lord, A. & Halse, J. - Proceed. Sardina, 95, p.387 (1995).

18. Gumargalieva, K. Z.; Ivanov, V. B.; Zaikov, G. E.; Moiseev, Ju. V. & Pokholok, T. V. - Polym. Degrad. Stab., 52, p.73 (1996). http://dx.doi.org/10.1016/0141-3910(95)00209-X

19. Maisonneuve, C.; Pierson, P.; Duquennoi, C. & Morin, A. - “Proceedings of the Sixth International Conference on Geosynthetics”, v.1, p.355-358, Industrial Fabric Association International, St Paul (1998).

20. Hsuan, Y. G.; Lord Junior A. E. & Koerner, R. M. - “Proceeding of Geosynthetics”, Atlanta, p.287-302 (1991).

21. Hsuan, Y. G. & Koerner, R. M. - J. Geotech. Geoenvion., 124, p.532 (1998). http://dx.doi.org/10.1061/(ASCE)1090- 0241(1998)124:6(532)

22. Sangam, H. P. & Rowe, R. K. - Can. Geotech. J., 39, 1221, (2002). http://dx.doi.org/10.1139/t02-074

23. Rowe, R. K; Quigley, R. M.; Brachman, R. W. I. & Booker, J. R. – “Barrier Systems for Waste Disposal Facilities”, 2nd ed, Spon Press, 587p. (2004).

24. Rimal, S.; Rowe, R. K. & Hansen, S. - “Proceedings of 57th Canadian Geotechnical Conference”, BiTech Publishing Ltd, Richmond, British Columbia, Section 5D, p.13-19 (2004).

25. Rowe, R. K. - Geotechnique, 55, p.631 (2005). http:// dx.doi.org/10.1680/geot.2005.55.9.631

26. Stark, T. D.; Choi, H. & Diebel, P. W. - “Geo-Frontiers”, Rathje E.M. (ed.), Geotechnical Special Publication 130- 142 (2005).

27. Gulec, S. B.; Edil, T. B. & Benson, C.H. - Geosynth. Int., 2, p.60, (2004). http://dx.doi.org/10.1680/gein.2004.11.2.60

28. Rowe, R. K. & Hoor, A. - Geosynth. Int., 16, p.71 (2009). http://dx.doi.org/10.1680/gein.2009.16.2.71

29. Rowe, R. K.; Rimal, S.; Arnepalli, D. N. & Bathurst, R. J. - Geotext. Geomembranes, 28, p.100, (2010). http:// dx.doi.org/10.1016/j.geotexmem.2009.10.012

30. Companhia de Tecnologia e Saneamento Ambiental - CETESB – “P4.231: Vinhaça: Critérios e procedimentos para aplicação no solo agrícola”, Cetesb, 12p. (2006).

31. American Society for Testing and Materials - ASTM - “ASTM D5199: Measuring Nominal Thickness of Geotextiles and Geomembranes”, ASTM, West Conshohocken (2006).

32. American Society for Testing and Materials - ASTM - “ASTM D792: Specific Gravity and Density of Plastics by Displacement”, ASTM, West Conshohocken (2008).

33. American Society for Testing and Materials - ASTM - “ASTM D6693: Standard Test Method for Determining Tensile Properties of Nonreinforced Polyethylene and Nonreinforced Flexible Polypropylene Geomembranes”, ASTM, West Conshohocken (2010).

34. American Society for Testing and Materials - ASTM - “ASTM D1004: Test Method for Initial Tear Resistance of Plastic Film and Sheeting”, ASTM, West Conshohocken (2009).

35. American Society for Testing and Materials - ASTM - “ASTM D4833: Test Method for Index Puncture Resistance of Geotextiles, Geomembranes and Related Products”, ASTM, West Conshohocken (2007).

36. American Society for Testing and Materials - ASTM - “ASTM D5596: Standard Test Method for Microscopic Evaluation of the Dispersion of Carbon Black in Polyolefin Geosynthetics”, ASTM, West Conshohocken (2003).

37. American Society for Testing and Materials - ASTM - “ASTM E1131: Standard Test Method for Compositional Analysis by Thermogravimetry”, ASTM, West Conshohocken (2008).

38. Geosynthetic Research Institute - “GM13: Test Properties, Testing Frequency and Recommended Warranty for High Density Polyethylene (HDPE) Smooth and Textured Geomembranes”, GSI, Folsom (2003).
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