Influência do meio suporte na formação de biofilme utilizando reator em batelada sequencial

Abstract

The eviction of effluents without proper treatment is one of the sources pollutions of aquatic ecosystems, causing drastic changes ecological conditions of water. The effluent treatment is a solution to reduce the damage caused and the biological treatment using biofilm has been widespread. This assignment aimed evaluate the influence of two supports (vegetal loofah and polyurethane foam) for biological removal of organic matter from domestic sewage using a sequential batch reactor. The reactors were operated for 42 days and each cycle has a duration of 48 hours. . It has been analyzed CFU/mL, MPN/100mL, ammonia, nitrate, nitrite, pH, temperature, dry biomass adhered, polysaccharide and microscopic and stereoscopic examination. The RBSB pH average was 6,34, RBSE 6,39 and RBSS 6,62. The reactor temperature was maintained between 20 and 25oC. The UFCs of the heterotrophics were on the order of 105 to 1012 for the RBSB, 107 to 108 for the RBSE, and 105 to 108 for the RBSS. The MPN/100mL was highest on RBSB for the group of nitrifying and denitrifying. It was found, through UFCs datas, dry biomass adhered and polysaccharides, that the vegetal loofah as support material was more favorable to the development of the biofilm than polyurethane foam. The polyurethane foam polyurethane foam although not favor the establishment of biofilm on the imposed conditions provided good removal of nitrogen by the process via nitrite.