Avaliação da remoção de Bisfenol-A em um reator de leito móvel com biofilme e dos impactos na nitrificação e degradação de matéria orgânica

Abstract

Bisphenol-A (BPA) is a compound widely used by the plastics industries, and known to be dangerous to health and the environment. Its removal by biological processes is desirable, but needs to be more widely studied. In this context, the treatment of BPA in a synthetic sanitary effluent matrix was evaluated in a moving bed reactor with biofilm (MBBR) - with 6h HRT and 250 m²/m³ - and the impacts caused in the removal of organic matter and ammoniacal nitrogen. by adding BPA to the reactor feed. The operation was divided into two periods, with the maximum removal rates obtained for the effluent feeding without and with BPA. The presence of BPA impacted the processes of removal of organic matter, as observed in the reduction of the maximum rates of volumetric, surface and specific removal by 28.5, 32 and 33.2%, respectively. Nitrogen removal was also impacted by the addition of bisphenol-A, with a decrease in maximum volumetric, surface and specific removal rates by 21, 21.7 and 21.5%, respectively. However, during the continuous operation of the reactor, the average removal of COD and ammonia nitrogen were 84.58% and 97.55%, respectively, before the addition of BPA in the feed, and 79.52% and 97.60 % in the presence of BPA. BPA removal reached values of 72.8% after a period of adaptation of MBBR to Bisphenol-A. This work brings results that are few or inexistent in the literature on the impact of BPA in biological processes of removal of organic matter and ammoniacal nitrogen.