Ed Carlo Rosa Paiva

Avaliação da compostagem de carcaças de frango pelos métodos da composteira e de leiras estáticas aeradas

It was evaluated the compostability of various waste properly mixed and the efficiency of different processes (aerated static piles and bin compost) in the elimination of microorganisms and time of composting. The experiments were built and monitored with the following compositions: bin method - coffee straw, poultry litter and poultry carcasses, ASP 01 - sugar cane bagasse, poultry litter and poultry carcasses; ASP 02 - sugar cane bagasse, poultry litter and ground poultry carcasses; ASP 03 - coffee straw, poultry litter and ground poultry carcasses. The parameters monitored during the process, were: temperature, C/N ratio, volatile solids (VS), pH and water content, besides Salmonella elimination and thermotolerants coliforms reduction were evaluated. The results obtained for the reduction of VS 20.87% (bin method), 25.31% (ASP 01), 28.86% (ASP 02) and 54.48% (ASP 03).

Demanda de potência do ventilador para aeração de material em compostagem

This study aimed to adjust loss curves in static air pressure when forced into layers of organic material, with different thicknesses and two stages of biochemical degradation, to enable the calculation of the power demand of the ventilation system. The residues used to evaluate air pressure loss were poultry litter mixed with coffee cherry husk, mass ratio of 2.5:1, to obtain an initial C/N relation of 30:1. It was found that the loss in static pressure increased linearly with the thickness of the organic compound, and that there was an increase in static pressure loss with increased specific flow rate of air, which practically did not change by the biochemical degradation stage of the composting material. All models used (potential, logarithmic and quadratic) fit the experimental data in the range of specific air flow between 0.045 and 0.159 m 3 s -1 m -2 , and they may be used to predict the static pressure gradients in the organic compost. The power demanded by the ventilation system in layers of 1 m thickness was 1.16 W t -1 in the material before composting, and 2.38 W t -1 , after 60 days of composting. In layers of 2 m thickness, the demand was 17.70 and 21.65 W t -1 , respectively.This study aimed to adjust loss curves in static air pressure when forced into layers of organic material, with different thicknesses and two stages of biochemical degradation, to enable the calculation of the power demand of the ventilation system. The residues used to evaluate air pressure loss were poultry litter mixed with coffee cherry husk, mass ratio of 2.5:1, to obtain an initial C/N relation of 30:1. It was found that the loss in static pressure increased linearly with the thickness of the organic compound, and that there was an increase in static pressure loss with increased specific flow rate of air, which practically did not change by the biochemical degradation stage of the composting material. All models used (potential, logarithmic and quadratic) fit the experimental data in the range of specific air flow between 0.045 and 0.159 m3 s-1 m-2, and they may be used to predict the static pressure gradients in the organic compost. The power demanded by the ventilation system in layers of 1 m thickness was 1.16 W t-1 in the material before composting, and 2.38 W t-1, after 60 days of composting. In layers of 2 m thickness, the demand was 17.70 and 21.65 W t -1, respectively.

DISPONIBILIDADE HÍDRICA E O USO DA ÁGUA NA BACIA HIDROGRÁFICA DO RIBEIRÃO PARI/SAMAMBAIA

Neste trabalho analisou-se a disponibilidade hidrica do manancial superficial na area de abrangencia do Ribeirao Pari/Samambaia. Para tal efetuaram-se estudos da oferta hidrica da regiao, com base em dados hidrologicos e climaticos, realizou-se a medicao in loco da vazao do Ribeirao Pari/Samambaia, bem como estudos e previsoes de uso urbano e agricola da regiao. Considerando a vazao minima determinada e a vazao necessaria de agua para o abastecimento publico, acredita-se que o abastecimento de agua para a cidade de Catalao para os proximos anos podera ser comprometido. Avaliando, ainda, o crescimento urbano da cidade, acima da media nacional, sera de suma importância a implantacao do gerenciamento e monitoramento da Bacia do Ribeirao Pari/Samambaia.