Natália da Silva Sunada

Adição de óleo e lipase sobre a biodigestão anaeróbia de dejetos suínos

The goal this paper was to verify the efficiency of the anaerobic co-digestion of manure with increasing levels of added oil disposal and lipase. Were tested four levels oil (8, 12, 16 and 20 g kg-1 substrate) and 3 doses of lipase (1, 2, 3g-1 kg of substrate). The parameters evaluated were: reduction of total solids (TS), volatile solids (VS) and most probable number (MPN) of total coliforms (TC) and thermophilic (TTC), in addition to pH, chemical oxygen demand (COD), production and potential biogas production. The results demonstrated the influence of additions of oil and lipase to the reductions in SV and ST effluent pH, following a model of linear prediction and descending. The reductions in MPN of TC and TTC were higher in treatments with more adding oil and lipase. Biogas production showed a negative correlation with the additions of lipase, and these yielded linear effect on the potential of biogas/kg of manure, ST and SV added. The additions of oil and lipase did not provide favorable effects on biogas production.

Biodigestão anaeróbia de efluente de abatedouro avícola

Anaerobic digestion of broiler slaughterhouse wastewater The objective of this study was to evaluate the process of anaerobic digestion treatment of poultry slaughterhouse wastewater, considering hydraulic retention time (HRT) of 7, 14 and 21 days, plus the addition of lipolytic enzyme to the substrates at concentrations of 0; 0.5; 1.0 and 1.5 g L -1 charge added to the digesters. The influence of HRT and the addition of lipolytic enzyme to the substrates was evaluated by biogas production and CH 4 production potentials for COD (chemical oxygen demand) added and removed as well as by reductions in the levels of COD, concentrations of N, P and K and pH values. The results showed that there was influence of HRT (HRT 7 in which the expressed best results, average weekly production of biogas with 40.7 L -1 and 32.2 L -1 CH 4 ) and concentrations of enzymes with higher production values to treatments 1.0 (24.6 L) and 1.5 g L -1 (26.2 L), which did not differ. The enzyme concentrations of

Effects of biofertilizer rates on the structural, morphogenetic and productive characteristics of Piatã grass

Univ Estadual Paulista Julio de Mesquista Filho, Programa Posgrad Zootecnia, Rio de Janeiro, Brazil

Addition of lipolytic enzyme in anaerobic co-digestion of swine manure and inclusion levels of waste vegetable oil

*Corresponding Author: E-mail: anaorrico@ufgd.edu.br Studies that aim the reusing of agro-industrial wastes have become very important due to the high production of this sector and environmental preservation. The objective of this work was to evaluate the performance of digesters loaded with swine manure, increasing inclusion levels of waste oil and lipolytic enzyme, through the potential of biogas and methane production, as well as reductions in levels of total solids (TS) and volatile solids (VS). Batch digesters were loaded with substrates containing 4% TS, composed of pig manure, waste oil (ratios of 8, 10 and 12% in relation to levels of TS in the substrate) and lipolytic enzyme (0.05, 0.10, 0.15, 0.20 and 0.25% in relation to levels of TS in the substrate), water and inoculum. Maximum reduction of TS and VS were 56.13 and 64.49% respectively and occurred in inclusion levels of 0.15 and 0.13% lipase and 12% oil. The greatest potential for methane for the amounts of TS and VS added (0.23 and 0.29L) were achieved by inclusion of 12% oil and levels of 0.12 and 0.11% lipase, and these values were up to 29.7% higher than yields observed for the lowest inclusion level of enzyme. The inclusion of 12% oil and 0.15% lipase in the composition of substrates containing pig manure improves the yields of methane and reductions in pollutant constituents.

Desempenho da co-digestão anaeróbia de dejetos suínos com inclusão de glicerina bruta

O objetivo foi avaliar o desempenho da co-digestao anaerobia de dejetos de suinos associados com crescentes doses de glicerina bruta, adotando-se diferentes tempos de retencao hidraulica (TRH). O delineamento utilizado foi inteiramente casualizado em esquema fatorial 3x4, tres TRH (10; 17 e 24 dias) e quatro doses de glicerina bruta (0; 5; 10 e 15% dos solidos totais), com quatro repeticoes por tratamento. Os parâmetros avaliados foram producao e potencial de producao de biogas, reducoes de solidos totais (ST), fibra em detergente neutro (FDN) e fibra em detergente acido (FDA). A producao de biogas e potencial de producao apresentaram efeito quadratico nos TRH de 17 e 24 dias, evidenciando como doses ideais 4,09 e 5,63% de glicerina bruta, respectivamente, para producao e 4,52 e 5,42% de glicerina bruta para potencial de producao. Nao houve diferenca entre as doses de glicerina bruta dentro do TRH de 10 dias para as reducoes de ST. No entanto, foi observado diferenca entre as doses nos TRH 17 e 24, com a maior reducao observada de 54,9% ao incluir 5% de glicerina bruta no maior TRH. As reducoes de FDN e FDA aumentaram de acordo com a adicao de glicerina bruta nos TRHs de 10 e 17 dias. A inclusao de 4 a 6% de glicerina bruta no TRH 24 mostrou-se mais eficiente na producao de biogas e reducoes de ST e FDN. Ja visando maior reducao de FDA pode-se utilizar doses mais altas de glicerina a partir da co-digestao com dejetos suinos.