Avaliação do consumo de substrato em diferentes meio suportes visando a biodessulfurização de biogás

• Autor(a) principal: Santos, Jessyka Lima [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156173; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-09-05/000891365.pdf
• topic: Biogas; Sulfetos; Ar - Poluição; Descontaminação; Poliuretanas; Sulfides

The growth of the atmospheric pollution is a big problem since the Industrial Revolution. According to the World Health Organization (WHO), the atmospheric pollution has caused the death of more than 7 million people in the world in 2012. Nowadays, 88% of the world's energy demand is provided by fossil fuels. The biogas, a gas generated from the anaerobic decomposition of organic matter by bacteria, has been a great substituent, due to its renewable source of energy and less polluting. The presence of contaminants restricts the use of the biogas. Among them, the hydrogen sulfide, a toxic, corrosive and extremely flammable gas is included. One of the forms to remove the H2S is by biotrickling filters The biodessulfurization can be executed by chemolithotrofic bacteria that oxidizes sulfide or thiosulfate, which uses NO3- as electrons final acceptor and grows in anoxic conditions. This paper has scrutinized PET as a alternative support material to this technology, comparing its efficiency with the one obtained by polyurethane foam, aiming a more economic favorable technology. The reactors, with a useful volume of 3.17.10-3 m3 each, were operated for 40 days, in which happened 6 cycles (needed time for consuming the thiosulfate, it is consumed proportionally to the sulfide by the microbiota), the 3 firsts cycles with 2,5 g L-1 of sodium thiosulfate and 1,0 g L-1 of potassium nitrate and the last 3 ones with 5,0 g L-1 sodium thiosulfate and 2,0 g L-1 of potassium nitrate of concentration. The speed of consuming of thiosulfate observed in the reactor filled with PET was superior than the polyurethane foam in most of the monitored time, showing the medium consume of 1,22 g[S-S2O32-].m-3.h-1 and the PU de 1,12 g[S-S2O32-].m-3.h-1. In all of the monitored cycles the amount of sulfide produced was bigger than the amount of thiosulfate consumed and the medium factor of conversion of the thiosulfate to sulfate in PET 80,90 % and in PU 81,53 %. There was...