Utilização agrícola de diferentes lodos gerados em Estações de Tratamento de Esgoto

• Ano de defesa: 2011
• Autor(a) principal: Souza, Francianny Maria de Paula
• Orientador(a): Fontes, Maurício Paulo Ferreira
• Banca de defesa: Neves, Antônio Augusto
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Solos e Nutrição de Plantas
• Departamento: Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,
• País: BR
• Palavras-chave em Português: Biossólido; Metais pesados; Milho
• Palavras-chave em Inglês: Biosolids; Heavy metals; Corn
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
• Link de acesso: http://locus.ufv.br/handle/123456789/5475

By itending to evaluate the application effect of sewage sludge Vespasiano, Morro Alto, Nova Pampulha and Vila Maria to rate soil quality and the development of corn plantation, an experiment in greenhouse was carried out. However, this study was preceded by an experiment of individual and competitive adsorption of Cd, Ni, Pb, Cr, Mn e Zn in order to evaluate the maximum capacity of adsorption and foretell the behavior of these elements when present in sewage sludge-rich soils. The experiment of individual adsorption was carried out by using solutions with increasing concentration of metals, ranging from 0 to 4 mmol L-1 prepared in NaNO3 and adjusted to pH 5,5±0,2 and the experiment of competitive adsorption was based on the proportion of metal average concentration present in sewage sludge. The solutions were prepared in NaNO3 and adjusted to pH 4,0±0,2. Previous to the experiment in greenhouse, the characterization of the soil and sewage sludge were evaluated. According to the sewage sludge characterization, it was verified that Cr and Pb present lower levels of extraction by DTPA. The experiment was displayed in randomized blocks and the treatments were according to the factorial 2[(4x6) - 3], in which it was used two kinds of soils with distinct texture and four kinds of sewage sludge applied in six doses (0; 10; 25; 50; 75; 100 t ha-1), on the condition that dose 0 was tested only one time on each soil. It was used vases with a capacity of 3 dm³ and sewage sludge were superficially applied to the soil and incubated for 20 days. By the end of the incubation period, three corn seeds were planted in vases and on the twentieth day thinning, keeping two plants in each vase until the fortieth day. After the cultivation, the plant production of dry matter and the accumulation of toxic elements (Cd, Pb, Ni, Cr, Mn e Zn) were evaluated. On the soil, routine analyses and extraction by DTPA were conducted. The data were statistically analyzed through F test, unfolding of interaction soil x sewage sludge x dose and by Tukey s test. In relation to the production of dry matter it could be observed that the results obtained for Vila Maria sewage sludge did not show significance. It was also observed that the availability of Pb, Ni e Cr was greater for sandy soil and in general, the effect of sewage sludge addition on the soil chemical characteristics was better observed on clay soils. Based on the analysis of application effects of sewage sludge in heavy metals, it could be concluded that the accumulation of metals (Pb and Zn) restrained the maximum number of applications of residue to the soil.