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Anaerobic biodigestion of solid and semi-solid wastes has been widely used for the treatment of these residues and methane production; however, during the process (more specifically in the acidogenic phase), there is a tendency of pH reduction, an unfavorable condition to methanogenic bacteria. Thus, the present work aims to evaluate the methanization potential of an agroindustrial anaerobic granular sludge (AIS) from UASB (Upflow Anaerobic Sludge Blanket) reactor, individually and biodigested with food waste (FW) from the University Restaurant of the Federal University of Pernambuco with buffering agent (AIS + FW + b) and without it (AIS + FW). After the laboratory tests, the AIS + FW + b configuration obtained a cumulative methane production approximately six times greater than that of AIS + FW, and approximately twice that of the inoculum alone (AIS).

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The present study evaluated the potential for biogas generation from organic waste unfit for consumption collected at the Pernambuco Supply and Logistics Center (CEASA-PE), as well as an estimation of the electric energy production from waste biodigestion generated in this plant. The biogas generation potential used BMP bench-test (biochemical methane potential) biodigesters, in which the biogas production was qualitatively/quantitatively evaluated from CEASA waste codigested with different inocula (bovine ruminal fluid, goat manure and UASB reactor sludge) under mesophilic conditions for 80 days. The laboratory test showed that the waste inoculated with ruminant manures (goat and bovine) presented the lowest net volume of generated biogas compared to the other treatments.: 23.2 and 19.2 NmL.gds-1. On the other hand, the treatments with sludge and mixture of all the inocula generated the largest biogas volumes: 37.6 and 44 NmL.gds-1, respectively. A potential of 359 kWh.d-1 of electric power generation was estimated from the biogas generated at CEASA from the BMP bench assay, as well as from the quantitative and physicochemical parameters of the waste generated in this unit. The results indicate high potential for energy generation in the evaluated CEASA plant, promoting the recovery of these wastes as an alternative and renewable source for sustainable energy production, transforming environmental liabilities into potentially energetic assets of aggregate economic value.

A produção de energia renovável a partir da biodegradação  de resíduos orgânicos,  como dejeto animal,  lodo de estação de tratamento de esgoto, frutas e vegetais e subprodutos da produção de biodiesel, são de grande importância  para a sustentabilidade ambiental e gestão ambiental destes resíduos. Nesse sentido, a digestão anaeróbia é uma alternativa para o tratamento desses materiais, bem como para a geração de biogás e, portanto, energia. Neste contexto, o presente trabalho visou determinar o potencial de produção de biogás a partir da codigestão de Resíduos Sólidos Orgânicos (RSO) inoculados com resíduo agrícola (Rúmen Bovino – RB) e lodo de estação de tratamento de efluentes (LD), com e sem adição de Glicerina (GL). Após 80 dias de incubação em frascos do tipo BMP (Biochemical Methane Potential) sob condições mesofílicas, o tratamento RSO+RB+LD foi o que apresentou a maior média de volume de biogás acumulado (258 NmL), seguida pelo tratamento RSO+LD (227 NmL) (todos sem adição de glicerina); RSO+RB+LD+GL (196 NmL) e, por fim, RSO+LD+GL (166 NmL) (estes dois últimos tratamentos, portanto, com adição de glicerina). Os tratamentos sem adição de glicerina apresentaram, portanto, uma geração de biogás média 35% superior aos seus tratamentos com glicerina.