Dinâmica da população de coliformes após a aplicação de dejetos de suínos no solo e durante a sua compostagem automatizada

• Ano de defesa: 2012
• Autor(a) principal: Sá, Mariangela Facco de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; BR; Agronomia; UFSM; Programa de Pós-Graduação em Ciência do Solo
• Palavras-chave em Português: E. coli; Resíduos da suinocultura; Tratamento de efluentes; Swine waste; Effluent treatment; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
• Link de acesso: http://repositorio.ufsm.br/handle/1/5564

The pig slurry (DLS) may have fecal microorganisms and parasites that contaminate soil and water sources. The efficient treatment of waste prevents the accumulation of organic material and reduces the population of microorganisms, facilitating its use in agriculture. Aiming to evaluate the dynamics of coliforms, two experiments were conducted. An experiment consisted of applying DLS surface and injected into the soil, evaluating, during 203 days, the population of fecal bacteria in runoff water, the technique most probable number (MPN), using broth Fluorocult, incubation at 37 º C for 24 h and subsequent reading by UV light. The work was done in a randomized block design with three replications, in an Ultisol soil in the experimental area of the Department of Soils at the Federal University of Santa Maria (UFSM). The mode of application of liquid manure in the soil did not affect the population dynamics of faecal coliforms, and at 203 days after application of DLS even coliforms were detected in runoff water. In another experiment, the DLS were treated for 156 days in an automated system for aerobic composting, using as substrate a mixture of sawdust and wood shavings. We evaluated the effect of composting adding phosphoric acid to the slurry until pH 6.0 on the coliform population. The automated composting process was effective in reducing the population of manure fecal coliforms, whose values of 0.19 NMP g-1 compound without the addition of acid and 0.03 NMP g-1 compound with acid addition, which do not differ, are below the limits set by the Ministry of Agriculture, Livestock and Supply (MAPA), which is 1.0 x 103. The compost obtained by reduction was equivalent to 99.99%.