Pós-tratamento da água residuária de suinocultura utilizando reator de batelada sequencial com lodo granular aeróbio

• Ano de defesa: 2021
• Autor(a) principal: Mourão, José Marcos Marques
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Remoção de matéria orgânica; Granulação aeróbia; Remoção de nutrientes; Diversidade microbiana
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/63742

Pig farming is the agro-industrial sector responsible for the main source of animal protein consumed in the world. Linked to this production process is the generation of liquid waste with high pollution potential, called swine wastewater (SWW). To ensure environmental sustainability to the sector, this waste must be treated appropriately. This study aimed to evaluate the performance of a Sequential Batch Reactor operating with Aerobic Granular Sludge (AGS) for the post-treatment of SWW, as well as to investigate the granulation of the aerobic biomass, the stability of the granules and its microbial diversity, besides verifying the impact of adopting optimized operational strategies for nutrient removal on the performance and characteristics of the AGS. The reactor was operated as part of a 2-stage secondary system (UASB followed by AGS), with 50% volumetric exchange and a cycle time of 12 hours. The influent concentrations of COD, N and P at the stationary stage were 1710±256 mgCOD L-1, 309.3±221.4 mgN L-1 and 66.5±37.5 mgP L-1. The granulation took 57 days of operation and the formed biomass has good sedimentability characteristics and cohesive structure. The removal efficiency of COD, N and P were 93%, 57% and 57% respectively, with nitrate accumulation at the end of the cycle. The biological community analysis corroborates with the reactor performance results and points to groups of microorganisms typical for AGS systems. To evaluate the impact of adopting optimized operational strategies it was possible to verify that the biomass sedimentation capacity was positively affected by the operational strategies, reaching the minimum SVI30 value of 22±3 mL g-1, without major changes in its particle size distribution. The maximum removal efficiencies of COD, N and P were 91±3, 36±7 and 86±11 % respectively, with nitrate accumulation at the end of the cycle. The internal recirculation was the strategy that most favored the nitrogen removal, while the aeration flow reduction favored the phosphorus removal. The removal of organic matter was satisfactory in all strategies.