Avaliação de um biorreator piloto de lodo ativado no controle de odores.

Abstract

Despite the importance of industrial wastewater treatment plants (WWTP) in the conservation of ecosystems, they can be generate of gases with malodors containing volatile organic compounds - VOCs. Odors have been grounds for protests and complaints by the surrounding population the emission sources. Because environmental awareness, and impacts on human health, the aim of this study is to evaluate the efficiency of a pilot aerobic bioreactor in control of odorous gases emitted in wastewater treatment plant food industries. It was developed adiffusion system of odorous air in an aerobic activated sludge reactor, hermetically sealed, operated in sequencing batch system during the days 14, 21, 23 e 30 of July. Analysis of the physicochemical parameters of the activated sludge were used in the pilot performed aerobic reactor, such as determination of solids, BOD5, COD, OD, pH, temperature e IVL. The activity of the activated sludge biomass was assessed by respirometry test. The efficiency of the reactor in reducing the COD of gases was analyzed by gas from the absorption in potassium dichromate solution. To evaluate the odors was used methods of gas chromatography and mass spectrometry, collecting samples odorous gases adsorbed on activated carbon tubes at the inlet and outlet of the bioreactor. The results confirmed the potential of the diffusion in activated sludge system for treating odorous gases in WWTP with the VOCs removal in efficiency ranging from 97.3% to 98.9%.