Long-Term Operation of an ASBBR Used to Treat Dairy Effluent: Effect of the Recirculation Rate on System Monitoring, Kinetics, and Key Microorganisms

Autor(es)

Santana, Roberta S. S. ^[1] ; Figueiredo, Mayara S. ^[1] ; Pozzi, Eloisa G. ^[2] ; Sakamoto, Isabel K. ^[2] ; Balieiro, Julio C. C. ^[3] ; Melo, Mariza P. ^[3] ; Ribeiro, Rogers ^[1] ; Tommaso, Giovana ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Lab Environm Biotechnol, Dept Food Engn, Fac Anim Sci & Food Engn, BR-13635005 Pirassununga, SP - Brazil

^[2] Univ Sao Paulo, Lab Biol Proc, Ctr Res Dev & Innovat Environm Engn, Sao Carlos Sch Sch Engn, BR-13563120 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Dept Basic Sci, Fac Anim Sci & Food Engn, BR-13635005 Pirassununga, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: WATER AIR AND SOIL POLLUTION; v. 225, n. 11 NOV 2014.
• Citações Web of Science: 1

Resumo

The aim of the present study was to evaluate the influence of the recirculation rate on the efficiency of a 1,000-L pilot anaerobic sequencing batch biofilm reactor (ASBBR) treating effluent from a small dairy plant over a long-term period (570 days). Three operational conditions were studied, in which recirculation rates were varied, resulting in upflow velocities of 0.2, 3.8, and 6.4 m h(-1) and the cycle time of 48 h. The biomass was immobilized on plastic supports containing polyurethane foam. The organic loading rate varied according to the operations occurring in the dairy plant. After system stability had been verified, temporal profiles of the substrate and metabolite concentrations were obtained, allowing kinetic parameter inference. Sludge samples from the inoculum and from the reactor were analyzed through microscopic examination, molecular biology analyses, and specific methanogenic activity assays. The average efficiencies of organic matter removal were 82 +/- 11, 84 +/- 9, and 87 +/- 9 % at velocities of 0.2, 3.8, and 6.4 m h(-1), respectively. Microscopic examinations indicated that the fluorescent microorganisms decreased throughout the experiment, and they were not detected in the last condition. Homoacetogenesis was inferred as a possible pathway for H-2 removal and for maintenance of the methanogenic process. Specific methanogenic activity increased throughout the monitoring period. It was possible to conclude that the ASBBR was efficient, robust, and reliable in treating dairy effluents under the conditions used. (AU)

• Processo FAPESP: 07/54589-4 - Desenvolvimento de sistemas de tratamento biológico de resíduos da agroindústria - estudo de caso: laticínios
• Beneficiário: Rogers Ribeiro
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 10/11972-5 - Influência da velocidade ascensional no tratamento de águas residuárias de laticínios em ASBBR
• Beneficiário: Mayara Souza de Figueiredo
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica